1. The document provides detailed instructions for disassembling and assembling a priority valve and steering valve. It includes labeled diagrams of the parts.
2. The disassembly process involves carefully removing parts like springs, seals, spools, and relief cartridges. Cleaning is emphasized.
3. The assembly process specifies lubricating parts and installing them in reverse order, taking care to position seals and springs correctly.
Hyundai hl750 tm 3 wheel loader service repair manualdfujdjkskekmmd
The document provides disassembly and assembly instructions for three hydraulic components:
1. A priority valve with 20 parts that requires cleaning parts and replacing O-rings during assembly.
2. A steering valve with 25 parts where disassembly requires removing parts in a specific order and cleaning is important for assembly.
3. A cushion valve with 16 parts that likely has similar disassembly and cleaning steps as the other components.
Hyundai hl760 (#1001 #1301) wheel loader service repair manualdfujdjkskekmmd
1. The document provides disassembly and assembly instructions for a priority valve and steering valve. It includes detailed steps and diagrams showing the parts for each.
2. The priority valve disassembly involves removing parts like the spool assembly, springs, and relief cartridge. Assembly requires cleaning parts and replacing seals before reinstalling components.
3. The steering valve disassembly requires removing parts such as the end cap, gerotor set, drive components, and spool/sleeve assembly. Assembly involves cleaning parts, replacing seals, and carefully reinstalling components like springs and pins. Proper alignment and torque settings are important.
Hyundai hl740(tm) 7 wheel loader service repair manualdfujdjkskekmmd
This document provides instructions for disassembling and assembling the transmission of a vehicle. It describes how to remove components like the filter unit, warning switch, hydraulic control unit, duct plate, gaskets, converter safety valve, transmission pump, clutches, input shaft, and more. Detailed steps and diagrams are included, along with the required special tools to complete each step safely and properly.
Hyundai hl757 tm 7a wheel loader service repair manualdfujdjkskekmmd
This document provides instructions for disassembling and assembling a steering unit. It describes the individual parts of the steering unit and steering cylinder. The disassembly process involves removing screws, seals, springs, and other components in a specific order. Assembly is the reverse of disassembly, with parts cleaned, inspected, lubricated and installed in the proper sequence while ensuring proper alignment of markings. Tightening torques are provided for screws. Tools required are also listed.
Hyundai hl780 9 wheel loader service repair manualdfujdjkskekmmd
This document provides instructions for disassembling and assembling various components of hydraulic pumps and control valves, including:
- Disassembling the main pump by removing components like the control valve, connection plate, distributor plate, and rotary group.
- Inspecting pump components for wear and replacing worn parts like bearings.
- Assembling the main pump by refitting components in reverse order and adjusting tapered roller bearings.
- Disassembling the main control valve by removing spools, valves, and other internal parts.
- Proper precautions for disassembly, reassembly, and inspection of hydraulic components to prevent damage.
- Disassembling remote control
Hyundai hl770 7 wheel loader service repair manualujjjjfkksekmmdm
This document provides maintenance instructions for various systems on a piece of work equipment. It includes sections on the engine, power train, brake, steering and work equipment systems. Each section includes groups covering structure and function, operational checks and troubleshooting, tests and adjustments, and disassembly and assembly. The document provides detailed steps and diagrams for disassembling and assembling components like the main pump, main control valve, and double acting spools within the various systems. Precautions are outlined and proper procedures and torque specifications are provided to ensure correct reassembly.
Hyundai r35 z 7a mini excavator service repair manualsoeldksejdksem
This document provides instructions for removing and installing a hydraulic pump. It describes:
1. Draining the hydraulic oil from the tank and disconnecting hoses and connectors before removing the pump assembly.
2. Removing mounting bolts and socket bolts to disconnect the pump suction tube and remove the pump from the housing.
3. Tools and jigs needed for disassembly and reassembly, including various sized wrenches and screwdrivers, as well as a disassembly table and port plate jigs.
4. Cautions for disassembly and assembly, such as taking care not to drop parts and ensuring no foreign materials enter during assembly.
Hyundai r160 lc 9 crawler excavator service repair manualfksjksmmde
This document provides instructions for the removal and installation of a pump device. It includes:
1. Steps for removing the pump such as draining fluids, disconnecting hoses and bolts, and removing the pump assembly.
2. Details on installing the pump by reversing the removal steps, and bleeding air from the system.
3. An illustration and explanation of the main pump structure and components.
4. Guidelines for disassembly and assembly of the pump, noting cleaning, lubrication and torque specifications for reinstallation.
Hyundai hl750 tm 3 wheel loader service repair manualdfujdjkskekmmd
The document provides disassembly and assembly instructions for three hydraulic components:
1. A priority valve with 20 parts that requires cleaning parts and replacing O-rings during assembly.
2. A steering valve with 25 parts where disassembly requires removing parts in a specific order and cleaning is important for assembly.
3. A cushion valve with 16 parts that likely has similar disassembly and cleaning steps as the other components.
Hyundai hl760 (#1001 #1301) wheel loader service repair manualdfujdjkskekmmd
1. The document provides disassembly and assembly instructions for a priority valve and steering valve. It includes detailed steps and diagrams showing the parts for each.
2. The priority valve disassembly involves removing parts like the spool assembly, springs, and relief cartridge. Assembly requires cleaning parts and replacing seals before reinstalling components.
3. The steering valve disassembly requires removing parts such as the end cap, gerotor set, drive components, and spool/sleeve assembly. Assembly involves cleaning parts, replacing seals, and carefully reinstalling components like springs and pins. Proper alignment and torque settings are important.
Hyundai hl740(tm) 7 wheel loader service repair manualdfujdjkskekmmd
This document provides instructions for disassembling and assembling the transmission of a vehicle. It describes how to remove components like the filter unit, warning switch, hydraulic control unit, duct plate, gaskets, converter safety valve, transmission pump, clutches, input shaft, and more. Detailed steps and diagrams are included, along with the required special tools to complete each step safely and properly.
Hyundai hl757 tm 7a wheel loader service repair manualdfujdjkskekmmd
This document provides instructions for disassembling and assembling a steering unit. It describes the individual parts of the steering unit and steering cylinder. The disassembly process involves removing screws, seals, springs, and other components in a specific order. Assembly is the reverse of disassembly, with parts cleaned, inspected, lubricated and installed in the proper sequence while ensuring proper alignment of markings. Tightening torques are provided for screws. Tools required are also listed.
Hyundai hl780 9 wheel loader service repair manualdfujdjkskekmmd
This document provides instructions for disassembling and assembling various components of hydraulic pumps and control valves, including:
- Disassembling the main pump by removing components like the control valve, connection plate, distributor plate, and rotary group.
- Inspecting pump components for wear and replacing worn parts like bearings.
- Assembling the main pump by refitting components in reverse order and adjusting tapered roller bearings.
- Disassembling the main control valve by removing spools, valves, and other internal parts.
- Proper precautions for disassembly, reassembly, and inspection of hydraulic components to prevent damage.
- Disassembling remote control
Hyundai hl770 7 wheel loader service repair manualujjjjfkksekmmdm
This document provides maintenance instructions for various systems on a piece of work equipment. It includes sections on the engine, power train, brake, steering and work equipment systems. Each section includes groups covering structure and function, operational checks and troubleshooting, tests and adjustments, and disassembly and assembly. The document provides detailed steps and diagrams for disassembling and assembling components like the main pump, main control valve, and double acting spools within the various systems. Precautions are outlined and proper procedures and torque specifications are provided to ensure correct reassembly.
Hyundai r35 z 7a mini excavator service repair manualsoeldksejdksem
This document provides instructions for removing and installing a hydraulic pump. It describes:
1. Draining the hydraulic oil from the tank and disconnecting hoses and connectors before removing the pump assembly.
2. Removing mounting bolts and socket bolts to disconnect the pump suction tube and remove the pump from the housing.
3. Tools and jigs needed for disassembly and reassembly, including various sized wrenches and screwdrivers, as well as a disassembly table and port plate jigs.
4. Cautions for disassembly and assembly, such as taking care not to drop parts and ensuring no foreign materials enter during assembly.
Hyundai r160 lc 9 crawler excavator service repair manualfksjksmmde
This document provides instructions for the removal and installation of a pump device. It includes:
1. Steps for removing the pump such as draining fluids, disconnecting hoses and bolts, and removing the pump assembly.
2. Details on installing the pump by reversing the removal steps, and bleeding air from the system.
3. An illustration and explanation of the main pump structure and components.
4. Guidelines for disassembly and assembly of the pump, noting cleaning, lubrication and torque specifications for reinstallation.
Hyundai hl760 (#1001 #1301) wheel loader service repair manualudjjjskkkdmm
1. The document provides disassembly and assembly instructions for a priority valve and steering valve. It includes detailed steps and diagrams for removing and replacing over 30 individual parts for each valve.
2. Cleanliness is emphasized as important for both disassembly and assembly. All parts should be cleaned with solvent and lubricated with grease before reassembly.
3. Proper positioning and alignment of parts is crucial during assembly, such as aligning spring slots and ensuring pins remain horizontal. Torque specifications are provided for tightening screws.
Hyundai hl730 3 wheel loader service repair manualfjjskekdmmse
The document provides instructions for disassembling and assembling a priority valve and steering unit. It includes diagrams labeling the parts of each system.
The priority valve disassembly instructions describe removing the plugs and seal rings, pressing out the spool, and disassembling the remaining parts. Assembly is the reverse of disassembly.
The steering unit disassembly involves removing the end cover, cardan shaft, plates and seals. Individual parts like the spool, springs and ball are then removed. Assembly shows reinstalling these parts in reverse order with lubrication. Troubleshooting tips are provided for common issues.
Hyundai hl730 3 wheel loader service repair manualidkkddmmd1
The document provides instructions for disassembling and assembling a priority valve and steering unit. It includes diagrams showing the individual parts of each component.
For the priority valve:
1) The disassembly instructions describe removing the piping and then loosening and removing the plugs and spool to disassemble the valve.
2) Cleaning, inspection and lubrication steps are provided before assembly.
3) Reassembly involves placing the seals and springs back into the housing and tightening the plugs.
For the steering unit:
1) Disassembly requires removing screws, plates, seals and the spool/sleeve assembly from the housing.
2) Assembly shows replacing the seals
Hyundai hl730 3 wheel loader service repair manualfjjsekdmme
The document provides instructions for disassembling and assembling a priority valve and steering unit. It includes diagrams showing the parts of each system and the order for disassembly and assembly. Key steps for disassembly of the priority valve include loosening plugs, removing seals and springs, and pressing out the spool. Key steps for assembly include lubricating parts, placing seals and springs, and tightening plugs to the specified torque. The steering unit disassembly and assembly follows a similar process of removing and replacing individual parts like seals, bearings, plates and bushings. Cleaning and inspection of parts is recommended between disassembly and assembly.
Hyundai hl730 3 wheel loader service repair manualfhsjejkdmem
The document provides instructions for disassembling and assembling a priority valve and steering unit. It includes diagrams showing the individual parts of each component.
For the priority valve:
1) The disassembly instructions describe removing the piping and then loosening screws to remove the plugs and spool.
2) Cleaning, inspection and lubrication steps are outlined before assembly.
3) Reassembly involves placing parts back in reverse order and tightening screws to specified torques.
For the steering unit:
1) Disassembly requires removing screws, pins and O-rings to separate the housing, gearwheel, plates and spool/sleeve.
2) Assembly shows replacing parts
Hyundai hl730 tm 3 wheel loader service repair manualufjjsejfkskemme
The document provides instructions for disassembling and assembling a priority valve and steering unit.
It begins with identifying the key parts of each system. It then outlines the disassembly process for each system step-by-step, including removing seals, springs, plugs, and other components. Cleaning and inspection instructions are provided.
The assembly section again provides a step-by-step process for reassembling each system in reverse order, making sure to replace seals and lubricate parts as specified. Torque specifications are given for tightening components.
Hyundai hl730 tm 3 wheel loader service repair manualfiksfejjsekkmme
The document provides instructions for disassembling and assembling a priority valve and steering unit.
It begins with identifying the key parts of each system. It then outlines the disassembly process for each, which involves removing components in a specific order while cleaning each part.
The assembly section provides step-by-step instructions for reassembling the systems in the reverse order. It emphasizes lubricating parts and ensuring seals and springs are correctly positioned. Testing and troubleshooting tips are also included.
Hyundai hl730 tm 3 wheel loader service repair manualfjkskekxsdcmdmme
The document provides instructions for disassembling and assembling a priority valve and steering unit.
It begins with identifying the key parts of each system. It then outlines the disassembly process for each component in step-by-step instructions. Cleaning and inspection procedures are described.
The assembly section provides detailed steps for reassembling each part in the proper orientation. Torque specifications and lubrication requirements are included. Troubleshooting tips are also listed for common issues.
Hyundai hl730 tm 3 wheel loader service repair manualujjjjfkksekmmdm
The document provides instructions for disassembling and assembling a priority valve and steering unit.
It begins with identifying the key parts of each system. It then outlines the disassembly process for each system step-by-step, including removing seals, springs, plugs, and other components. Cleaning and inspection instructions are provided.
The assembly section again provides a step-by-step process for reassembling each system in reverse order, making sure to replace seals and lubricate parts as specified. Torque specifications are given for tightening components.
Hyundai hl730 tm 3 wheel loader service repair manualfjkskekxsdcmdmme
The document provides instructions for disassembling and assembling a priority valve and steering unit.
It begins with identifying the key parts of each system. It then outlines the disassembly process for each system step-by-step, including removing seals, springs, plugs, and other components. Cleaning and inspection instructions are provided.
The assembly section again provides a step-by-step process for reassembling each system in reverse order, making sure to replace seals and lubricate parts as specified. Torque specifications are given for tightening components.
Hyundai hl720 3 wheel loader service repair manualfjjskekdmmse
The document provides instructions for disassembling and assembling a steering unit. It includes diagrams labeling the parts and instructions for removing each component in the listed order. The components include plugs, seals, springs, balls, bushings, pins, and other internal parts. Cleaning, inspection, lubrication steps are described. Torque specifications and tightening instructions are provided for reassembly. Troubleshooting tips are included for issues like heavy steering or leakage.
Hyundai hl720 3 wheel loader service repair manualidkkddmmd1
The document provides instructions for disassembling and assembling a steering unit. It includes:
1) A list of parts for the priority valve and steering unit with labeled diagrams.
2) Steps for disassembling the priority valve and steering unit, which includes removing screws, pins, seals, springs, and other small parts.
3) Instructions for cleaning, inspecting, lubricating, and assembling the priority valve and steering unit, replacing worn parts as needed. Tightening torques are provided for screws.
Hyundai hl720 3 wheel loader service repair manualfhsjejkdmem
The document provides instructions for disassembling and assembling a steering unit. It includes:
1) A list of parts for the priority valve and steering unit with labeled diagrams.
2) Steps for disassembling the priority valve and steering unit which include removing screws, pins, seals, springs and other small parts.
3) Instructions for cleaning, inspecting, lubricating and assembling the priority valve and steering unit in the reverse order of disassembly. Tightening torques and hydraulic connections are also provided.
Hyundai hl720 3 wheel loader service repair manualfjjsekdmme
The document provides instructions for disassembling and assembling a steering unit. It includes:
1) A list of parts for the priority valve and steering unit with labeled diagrams.
2) Steps for disassembling the priority valve and steering unit, which includes removing screws, pins, seals, springs, and other small parts.
3) Instructions for cleaning, inspecting, lubricating, and assembling the priority valve and steering unit, replacing worn parts as needed. Tightening torques and hydraulic connections are also provided.
Hyundai hl730 tm 3 wheel loader service repair manualfjjsekmmm
The document provides instructions for disassembling and assembling a priority valve and steering unit.
It begins with identifying the key parts of each system. It then details how to carefully disassemble each component, clean all parts, inspect for wear, and lubricate before reassembly. Precise steps are outlined for reinstalling each part in the proper orientation and order. Torque specifications are provided for securely fastening parts. Finally, basic troubleshooting tips are given.
Hyundai hl770 7 wheel loader service repair manualfjjsekmmm
This document provides maintenance instructions for various systems on a piece of work equipment. It includes sections on the engine, power train, brake, steering, and work equipment systems. Each section includes descriptions of component structure and function, operational checks and troubleshooting, tests and adjustments, and disassembly and assembly instructions. The document provides detailed steps and diagrams for disassembling and reassembling major components like the main pump and main control valve. Safety precautions and proper procedures are emphasized throughout.
Hyundai hl770 7 wheel loader service repair manualufjjsejfkskemme
This document provides maintenance instructions for various systems on a piece of work equipment. It includes sections on the engine, power train, brake, steering, and work equipment systems. Each section includes groups covering structure and function, operational checks and troubleshooting, tests and adjustments, and disassembly and assembly. The document provides detailed steps and diagrams for disassembling and assembling components like the main pump, main control valve, and double acting spools. Safety precautions are noted, and proper torque specifications and replacement of parts like seals and O-rings are emphasized.
Hyundai hl770 7 wheel loader service repair manualfjkskekxsdcmdmme
This document provides maintenance instructions for various systems on a piece of work equipment. It includes sections on the engine, power train, brake, steering and work equipment systems. Each section includes groups covering structure and function, operational checks and troubleshooting, tests and adjustments, and disassembly and assembly. The document provides detailed steps and diagrams for disassembling and assembling components like the main pump, main control valve, and double acting spools within the various systems. Precautions are outlined and proper procedures and torque specifications are provided to ensure correct reassembly.
Hyundai h70 crawler dozer service repair manualidkkddkmd
The document provides instructions for disassembling and assembling a main hydraulic pump and main control valve. It describes in detail how to disassemble both into individual components and clean or inspect each part. Reassembly instructions explain how to lubricate and correctly install each component in the proper order and orientation. Proper cleanliness, lubrication, and torque specifications are emphasized to ensure correct functioning.
Hyundai h70 crawler dozer service repair manualfjjskekmdmme
The document provides instructions for disassembling and inspecting the main components of a hydraulic pump and control valve. It describes removing the end covers, gears, bushings, seals and other parts of the pump. It also explains taking apart the spool seal and intersection seal parts of the control valve. Cleanliness and care are emphasized to avoid damaging precise surfaces and ensure correct reassembly.
Hyundai hl740(tm) 7 wheel loader service repair manualudjjjskkkdmm
This document provides instructions for disassembling and assembling the transmission of a vehicle. It describes how to remove components like the filter unit, warning switch, hydraulic control unit, duct plate, gaskets, converter safety valve, transmission pump, clutches, input shaft, and more. Detailed steps and diagrams are included, along with the required special tools to complete each step safely and properly.
Hyster n177 (h70 ft) forklift service repair manualudjjjskkkdmm
The document provides specifications and capacities for various lift truck models. It includes the lifting capacity, counterweight, tire sizes, fuel capacities, engine oil quantities, cooling system capacities, hydraulic tank capacities, transmission quantities, brake fluid amounts, differential and drive axle oils, and electrical system details. The document also provides transmission oil pressure specifications and general drive axle repair procedures.
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Hyundai hl760 (#1001 #1301) wheel loader service repair manualudjjjskkkdmm
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The document provides instructions for disassembling and assembling a priority valve and steering unit. It includes diagrams labeling the parts of each system.
The priority valve disassembly instructions describe removing the plugs and seal rings, pressing out the spool, and disassembling the remaining parts. Assembly is the reverse of disassembly.
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Hyundai hl730 3 wheel loader service repair manualidkkddmmd1
The document provides instructions for disassembling and assembling a priority valve and steering unit. It includes diagrams showing the individual parts of each component.
For the priority valve:
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2) Cleaning, inspection and lubrication steps are provided before assembly.
3) Reassembly involves placing the seals and springs back into the housing and tightening the plugs.
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Hyundai hl730 3 wheel loader service repair manualfjjsekdmme
The document provides instructions for disassembling and assembling a priority valve and steering unit. It includes diagrams showing the parts of each system and the order for disassembly and assembly. Key steps for disassembly of the priority valve include loosening plugs, removing seals and springs, and pressing out the spool. Key steps for assembly include lubricating parts, placing seals and springs, and tightening plugs to the specified torque. The steering unit disassembly and assembly follows a similar process of removing and replacing individual parts like seals, bearings, plates and bushings. Cleaning and inspection of parts is recommended between disassembly and assembly.
Hyundai hl730 3 wheel loader service repair manualfhsjejkdmem
The document provides instructions for disassembling and assembling a priority valve and steering unit. It includes diagrams showing the individual parts of each component.
For the priority valve:
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2) Cleaning, inspection and lubrication steps are outlined before assembly.
3) Reassembly involves placing parts back in reverse order and tightening screws to specified torques.
For the steering unit:
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Hyundai hl730 tm 3 wheel loader service repair manualufjjsejfkskemme
The document provides instructions for disassembling and assembling a priority valve and steering unit.
It begins with identifying the key parts of each system. It then outlines the disassembly process for each system step-by-step, including removing seals, springs, plugs, and other components. Cleaning and inspection instructions are provided.
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The document provides instructions for disassembling and assembling a priority valve and steering unit.
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Practical Tips: Gain actionable insights and tips to effectively prevent catalytic converter theft.
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4. 5-32
DISASSEMBLY
Cleanliness is the primary means of
assuring satisfactory the priority valve life.
Select clean place.
Before removing the piping, clean the
surrounding area of valve ports.
3)
Ɠ
Remove spool assy(2).
(4)
Remove spring (6).
(3)
Fix the housing(1) in a vise with copper or
lead sheets.
Do not over tighten jaws.
Loosen plug(18) for LS port.
(1)
(2)
EF
CF
EF
CF
EF
CF
5. 5-33
Remove the O-ring(15).
Remove the guide(16), spring(13), holder
(17) and ball(14), in that order.
Do not remove the screen(11) and ring
(10) because that parts were locked the
relief valve.
(8)
(9)
Secure the hexagon head of the relief in a
vise and loosen the screw(12) from relief
valve with hexagon wrench.
(7)
Remove the relief valve cartridge
assembly(7) from the housing(1).
(6)
Remove plug(20) and separate O-ring
(19) and plug(18, 20) individually.
Can't remove the orifice(4) and orifice(5)
from spool(3), because the orifices were
locked at the spool.
(5)
Ɠ
(10)
EF
CF
EF
CF
6. 5-34
Fix the housing(1) in a vise.
Do not over tighten jaws.
Insert the relief valve cartridge(7) into the
housing(1) and tighten the valve
assembly.
şTighten torque : 2.1kgfşm(15.2lbşft)
(2)
Ɠ
(3)
Tighten the screw(12) by using hexagon
wrench.
Steering valve setting pressure of priority
valve is adjustable by the screw(12).
ş1 turn Ƒ 70kgf/cm2
ں
Ɠ
Assembly the relief valve cartridge(7).
Insert the O-ring(15) onto the housing(1).
Assemble the guide(16), spring(13),
holder(17) and ball(14) and insert this
sub assembly to the housing(1).
(1)
ڸ
ڹ
ASSEMBLY
Clean all metal parts in clean solvent and
blow dry with air and correct any damage,
burrs and rust.
Do not wipe dry with cloth or paper towel.
Replace seals such as O-ring with new
ones as a rule and coat with grease.
4)
Ɠ
Ɠ
Ɠ
EF
CF
7. 5-35
Install the O-ring(19) onto plug(18, 20) and
install the plug(18, 20) into the housing(1).
şTighten torque : 4.5kgfşm(32.5lbşft)
This completes assembly.
(6)
Insert the spring(6) into the housing(1).
(5)
Secure the spool(2) to move smoothly by
finger.
Ɠ
Insert the spool(2) in the housing(1).
Secure the spool(2) remain in their correct
direction as the illustration.
(4)
Ɠ
EF
CF
EF
CF
EF
CF
EF
CF
8. 5-36
TROUBLESHOOTING
5)
Problem
Steering wheel
is heavy
(Steering wheel
is heavy at
engine low idle)
(Steering speed
is not high at
engine high idle)
Abnormal noise
Leakage
Cause
1. Relief valve is clogged with dirt.
2. Spool is stuck.
3. Orifice of plug and spool is clogged.
a. Pump is faulty.
b. Control pressure is low.
c. Piping is faulty.
d. Pump is faulty.
1. Relief valve is clogged with dirt.
2. Spool is stuck.
1. Loosen the plug.
2. O-ring is damaged.
Remedy
Disassembly, clean and reassembly.
Disassembly, clean and reassembly or
replace.
Disassembly, clean and reassembly.
Check pump.
Reset control pressure.
Replace piping.
Check pump.
Disassembly, clean and reassembly.
Disassembly, clean and reassembly or
replace.
Retighten the specified torque.
Replace.
10. 5-38
DISASSEMBLY
Cleanliness is extremely important when
repairing a hydraulic steering control unit.
Work in a clean area. Before disconnecting
the hydraulic lines, clean the port area of
the steering control unit. Before
disassembly, drain the oil, then plug the
ports and thoroughly clean the exterior of
the steering control unit. During repairs,
always protect machined surfaces.
3)
Ɠ
Mount steering control unit in vise
horizontally for breaking loose seven cap
screws. Use this mounting position for final
torque of reassembled unit.
Ɠ
13-19mm
(0.5-0.75in)
Steering control units with anti-cavitation
valves require special handling in both
disassembly and reassembly. Ball valves
(2) can end up in a cavity in the housing
were they are not supposed to be. These
unit must be disassembled and
reassembled in the vertical position ;
Removal of anti-cavitation valves is outlined
in step (8).
After cap screws have been loosened,
mount steering control unit in the vise
vertically for disassembly and reassembly.
Illustrations have been created from the
exploded parts drawing, and do not relate
the parts correctly as seen by the service
person.
Ɠ
Ɠ
Ɠ
Anti-cavitation valves
(Located under these
two cap screw)
Check ball
Roll Pin
13-19mm
(0.5-0.75in)
End can
top view
11. 5-39
Remove the 7 cap screws(1), end cap(2),
O-ring(3), gerotor(4), O-ring(3), spacer
plate (5) and O-ring(3).
(1)
Cap screw
O-ring
End cap
Gerotor
Spacer plate
Housing
Engage tool with splined end of spool.
(2)
Tool
Housing
Splined drive
Gerotor star
Housing vertically mounted
Protect gerotor star and hand with shop
towel - Hold gerotor star and splined drive
from turning.
(3)
Tool
Gerotor star
and splined
drive engaged
12. 5-40
With drive held stationary and centering
spring compressed, carefully push these
assembled parts out of housing.
(5)
Spool, sleeve, drive,
pin, bearing race, retaining
ring, needle thrust bearing
and second bearing race
Tool
Remove the thrust bearing race and
needle thrust bearing.
(6)
Gerotor star
Splined drive
Needle thrust bearing
Bearing race
Housing
Tool
Spool, sleeve, drive,
pin, bearing race
and retaining ring
Hidden pin
If tension on this pin is released before
these parts are fully disengaged and the
pin is not horizontal, the pin can drop and
lockup can occur like a deadbolt.
Positioning unit vertically is a safe option
and is required if the unit has anti-
cavitation valves.
Ɠ
Twist tool to compress centering spring
radially CW or CCW, decreasing the coil
diameter of the centering spring allowing it
to be removed along with the spool and
sleeve(Ball checks if applicable), drive,
pin, bearing race(2), retaining ring, and
needle thrust bearing.(Bearing races,
retaining ring, and needle thrust bearing,
not shown on drawing(Right). Centering
spring shown compressed.)
(4)
Centering spring
Tool
Hidden pin
(See note)
Gerotor
star
13. 5-41
Remove the retaining ring, bearing race,
centering spring, pin, drive, spool, sleeve.
(7)
Drive Sleeve Centering spring Bearing race
Retaining
ring
Spool
Pin
Bearing race
Retaining ring
Centering
spring free
position
Drive
Pin
Spool
Housing vertically mounted
Sleeve
14. 5-42
Anti cavitation valves
Insert two soda straws, one in each of two
threaded holes, as a safety measure for
removal of two small ball check valves
and roll pins(Correct threaded holes
identified in illustration right). Remove
housing from vise, tilt the housing and
bring the port face upward. Continue
turning the housing until the roll pins and
ball checks slide through the straws from
the meter(Gerotor) end of the housing.
(8)
Soda straw
Tilt housing
Roll pin
Check ball
Port face
Meter
(Gerotor)
end
Check ball
Roll pin
Port face
Soda straw
Roll pin
Meter(Gerotor) end
Guide tool
(Soda straw)
Port face
Top view
Anti-cavitation valve-
Insert soda straw(2),
one into each of these
two threaded holes
Remove the shaft seal. These three
parts may or may not still be in the
housing. These parts include O-ring, seal
ring, and backup washer.
Using a small blade screwdriver, carefully
pry the dust seal from the housing.
Do not damage the dust seal seat.
(9)
(10)
Ɠ
Seal(3 Piece)
Backup washer
Seal ring
O-ring
Housing
Dust seal
15. 5-43
ASSEMBLY
Check all mating surfaces. Replace any
parts that have scratches or burrs to lessen
the chance of leakage. Wash all metal
parts in clean solvent. Blow them dry with
pressurized air. Do not wipe parts dry with
paper towels or cloth. Lint in a hydraulic
system will cause damage.
Always use new seals when reassembling
hydraulic steering control units.
During reassembly lubricate the new seals
with a petroleum jelly like Vaseline. Also
lubricate machined surfaces with clean
hydraulic fluid.
Lubricate and install the dust seal ; See
drawing(Right) for correct seal orientation.
4)
Ɠ
Ɠ
Ɠ
(1)
Housing Dust seal
Anti cavitation valves
Installing the anti-cavitation ball checks
seems simple enough ; However, a word
of caution : Use a soda straw as a guide
tool. Drop the straw into the hole to the
bottom of bore, then drop ball through
straw. Pull straw and use the same
procedure in second ball seat. Check
each bore with small light to make sure
each ball is in the correct place. Add roll
pin in each bore.
(2)
Port face
Anti-cavitation
valves
Roll pin
Check ball
Guide tool
(Soda straw)
Housing vertically mounted
16. 5-44
Apply a light coating of clean hydraulic
fluid to the spool and slide it into the
sleeve along with the ball checks if
applicable.
Install the drive and pin.
Install the centering spring. Position one
end of spring in slotted end of spool and
sleeve, and compress the spring radially
(CCW) to engage free end of spring.
Install the bearing race and retaining ring
onto spool.
(3)
(4)
(5)
(6)
Drive Sleeve Centering spring Bearing race
Retaining
ring
Spool
Pin
Centering
spring free
position
Drive
Pin
Spool
Sleeve
Drive
Pin
Retaining ring
Install centering
spring as shown
(1st load position)
Sleeve
Spool
Bearing race
17. 5-45
Apply a light coating of petroleum jelly to
the inside diameter of the previously
mounted dust seal in the housing.
Apply a light coating of petroleum jelly to
the needle thrust bearing, second bearing
race, and three part shaft seal. Position
each part onto the spool as shown in
enlarged section drawing below. The
needle thrust bearing goes between the
two bearing races and must be centered
around retaining ring.
Apply a light coating of clean hydraulic
fluid to the spool and sleeve assembly and
slide it into the housing ; See steps (7)-
(12).
Do not damage the dust or shaft seals.
Ɠ
Ɠ
Ɠ
Ɠ
Housing vertically mounted
Housing with dust seal
Tool
O-ring
Seal ring
Backup washer
Seal(3 Piece)
Bearing race
Needle thrust bearing
Gerotor star
Splined drive
Spool sleeve, drive,
pin, bearing race and
retaining ring
Drive
Sleeve Centering spring
Bearing race
Spool
Pin
Needle thrust bearing
Seal(3 Piece) Seal ring
Backup washer
O-ring
Needle thrust bearing
(Must be centeredaround retaining ring.
Use petroleum jelly to hold parts in place.)
Retaining ring
18. 5-46
Protect gerotor star and hand with shop
towel - Hold gerotor star and splined end
of drive to keep it from turning.
Insert tool through housing ; Engage with
splined end of spool assembled inside of
sleeve along with ball checks(If
applicable), centering spring, drive, pin,
bearing race, retaining ring, needle thrust
bearing, second bearing race, shaft seals
and backup washer. Twist tool to
compress spring coils radially CW or
CCW.
If by some chance this unit is in the
horizontal position keep pin nearly
horizontal. If tension on this pin is
released before these parts are fully
engaged and the pin is not horizontal, the
pin can drop and lockup can occur like a
deadbolt.
(7)
(8)
Ɠ
Gerotor star
Housing
Tool
Spool, sleeve,drive,
pin, bearing race, retaining
ring,needle thrust bearing
and second bearing race
Housing vertically mounted
Keep centering spring compressed, and
carefully insert these assembled parts into
housing. Do not force.(Bearing races,
retaining ring, needle thrust bearing, shaft
seals and backup washer not shown on
drawing at right. Centering spring shown
compressed.)
(9)
Centering spring
Tool
Release centering spring tension.
(10)
Tool
19. 5-47
Remove gerotor star.
Remove tool.
(11)
(12)
Gerotor Star
Tool
Lubricate and install a new O-ring seal in
the groove in the housing.
Install the wear plate O-ring groove up
and align the holes in the wear plate with
threaded holes in the housing.
Lubricate and install a new O-ring seal in
the groove in the wear plate.
Install the gerotor and align the screw
holes.
Lubricate and install a new O-ring seal in
the groove in the gerotor ring.
Install the end cap and 7 cap screws.
Pretighten the cap screws, in a criss-cross
pattern, to 1.7kgfşm(12.3lbfşft), finally in a
criss-cross pattern, tighten cap screws to
3.4kgfşm(24.6lbfşft).
(13)
(14)
(15)
(16)
(17)
(18)
Cap screw
O-ring
End cap
Gerotor
Spacer plate
Housing
20. 5-48
3.CUSHIONVALVE
STRUCTURE
1)
1 Housing
2 Poppet
3 Spring
4 Valve seat
5 O-ring
6 O-ring
7 Back up ring
8 Orifice
9 Plug
10 O-ring
11 Spring
12 Spool
13 Plug
14 Plug
15 Spring
16 Poppet
17 Plug
TOOLS
şTorque wrench(5 ~ 20kgfşm)
şHexagon wrench(5, 6, 8mm)
şSpanner(36mm) or socket
ş Pincette
şGrease and seal tape
2)
4
5
7
6
2
14
5
15
16
10
11
13
17
13
1
16
15
5
14
12
11
10
9
3
2
6
7
5
4
21. 5-49
DISASSEMBLY
Cleanliness is extremely important when
repairing a cushion valve.
Clamp valve in vise. Use protective
material on vise jaws.
Do not over tighten jaws.
3)
Ɠ
Ɠ
Ɠ
Remove O-ring(5, 6) and back up ring(7)
from seat valve(4).
ڹ
Pilot valve part
Remove seat valve(4).
(1)
ڸ
Remove poppet(2).
ں
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