service repair manual

1. Printed in U.S.A.
Copyright © 2011 CNH America LLC. All Rights Reserved.
Case IH is a registered trademark of CNH America LLC.
Racine Wisconsin 53404 U.S.A.
Patriot 4430
Sprayer
Part number 84534618
1st edition English
August 2011
SERVICE MANUAL

2. SERVICE MANUAL
Patriot 4430
84534618 27/08/2011
EN

3. Contents
INTRODUCTION
HYDRAULIC, PNEUMATIC, ELECTRICAL, ELECTRONIC SYSTEMS A
PRIMARY HYDRAULIC POWER SYSTEM.............................................. A.10.A
ELECTRICAL POWER SYSTEM ........................................................ A.30.A
LIGHTING SYSTEM...................................................................... A.40.A
FAULT CODES ........................................................................... A.50.A
ENGINE AND PTO IN ................................................................... B
ENGINE .................................................................................. B.10.A
FUEL AND INJECTION SYSTEM........................................................ B.20.A
AIR INTAKE SYSTEM.................................................................... B.30.A
EXHAUST SYSTEM Emissions control .................................................. B.40.B
ENGINE COOLANT SYSTEM ........................................................... B.50.A
TRANSMISSION, DRIVE AND PTO OUT........................................ C
TRANSMISSION Hydrostatic............................................................. C.20.F
AXLES, BRAKES AND STEERING................................................. D
FRONT AXLE ............................................................................ D.10.A
REAR AXLE .............................................................................. D.12.A
STEERING Hydraulic..................................................................... D.20.C
SERVICE BRAKE Hydraulic.............................................................. D.30.C
PARKING BRAKE Hydraulic ............................................................. D.32.C
SUSPENSION Mechanical ............................................................... D.40.B
SUSPENSION Hydraulic ................................................................. D.40.C
WHEELS AND TRACKS Wheels......................................................... D.50.C
FRAME AND CAB ........................................................................ E
SHIELD................................................................................... E.20.A
OPERATOR AND SERVICE PLATFORM................................................ E.30.A
USER CONTROLS AND SEAT Operator seat ........................................... E.32.C
USER PLATFORM ....................................................................... E.34.A
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4. ENVIRONMENT CONTROL Heating, ventilation and air-conditioning................... E.40.D
FRAME POSITIONING ................................................................. F
TRAVELLING Towing..................................................................... F.10.D
STABILISING Static levelling ............................................................. F.20.C
STABILISING Working stabilising ........................................................ F.20.D
HITCH AND WORKING TOOL ....................................................... H
BOOM Lift ................................................................................ H.20.B
BOOM Tilt ................................................................................ H.20.C
BOOM Unfold............................................................................. H.20.G
BOOM Stabilising......................................................................... H.20.J
FIELD PROCESSING ................................................................... L
SPRAYING ............................................................................... L.20.A
SPRAYING Plumbing system ............................................................ L.20.B
SPRAYING Pressure system............................................................. L.20.C
SPRAYING End marker .................................................................. L.20.D
RINSING ................................................................................. L.22.A
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5. INTRODUCTION
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6. INTRODUCTION
Safety rules
WARNING
Misuse hazard!
Before starting the engine, make sure you are fully aware of the location and the function of each
control.
Failure to comply could result in death or serious injury.
W0226A
WARNING
Hazard to bystanders!
Always sound the horn before starting the machine. Make sure the work area is clear of other persons,
domestic animals, tools, etc. before you operate the machine. Never allow anyone in the work area
during machine operation.
Failure to comply could result in death or serious injury.
W0304A
WARNING
Unexpected machine movement!
Always sit in the operator's seat to operate the machine. DO NOT bypass the key start switch. Sudden
and unexpected machine movement or machine runaway could result.
Failure to comply could result in death or serious injury.
W0464A
WARNING
Entanglement hazard!
Always keep hair and clothing away from moving parts. Do not wear loose clothing, jewelry, or other
items that could entangle with moving parts and/or levers.
Failure to comply could result in death or serious injury.
W0445A
WARNING
Escaping fluid!
Hydraulic fluid or diesel fuel leaking under pressure can penetrate the skin and cause infection or
other injury. To prevent personal injury: Relieve all pressure before disconnecting fluid lines or per-
forming work on the hydraulic system. Before applying pressure, make sure all connections are tight
and all components are in good condition. Never use your hand to check for suspected leaks under
pressure. Use a piece of cardboard or wood for this purpose. If injured by leaking fluid, see your
doctor immediately.
Failure to comply could result in death or serious injury.
W0178A
WARNING
Avoid injury! Always do the following before lubricating, maintaining, or servicing the machine.
1. Disengage all drives.
2. Engage parking brake.
3. Lower all attachments to the ground, or raise and engage all safety locks.
4. Shut off engine.
5. Remove key from key switch.
6. Switch off battery key, if installed.
7. Wait for all machine movement to stop.
Failure to comply could result in death or serious injury.
W0047A
CAUTION
Flying objects!
Wear eye protection. Do not strike steel parts with a steel hammer. Parts may break.
Failure to comply could result in minor or moderate injury.
C0024A
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7. INTRODUCTION
CAUTION
Flying debris!
Compressed air can propel dirt, rust, etc. into the air. Wear eye and face protection when using com-
pressed air.
Failure to comply could result in minor or moderate injury.
C0049A
WARNING
Personal Protective Equipment (PPE) required.
When assembling, operating, or servicing the machine, wear protective clothing and PPE necessary
for the particular procedure. Some PPE that may be necessary includes protective shoes, eye and/or
face protection, hard hat, heavy gloves, filter mask, and hearing protection.
Failure to comply could result in death or serious injury.
W0353A
WARNING
Crushing hazard!
Unit could fall if not properly supported. Follow jacking instructions provided for the unit. Use suitable
jack stands. Be sure to position them properly.
Failure to comply could result in death or serious injury.
W0919A
WARNING
Explosive gas!
Batteries emit explosive hydrogen gas and other fumes while charging. Ventilate the charging area.
Keep the battery away from sparks, open flames, and other ignition sources. Never charge a frozen
battery.
Failure to comply could result in death or serious injury.
W0005A
WARNING
Hazardous chemicals!
Battery electrolyte contains sulfuric acid. Contact with skin and eyes could result in severe irritation
and burns. Always wear splash-proof goggles and protective clothing (gloves and aprons). Wash
hands after handling.
Failure to comply could result in death or serious injury.
W0006A
WARNING
Battery gas can explode!
To prevent an explosion: 1. Always disconnect the negative (-) battery cable first. 2. Always connect
the negative (-) battery cable last. 3. Do not short circuit the battery posts with metal objects. 4. Do
not weld, grind, or smoke near a battery.
Failure to comply could result in death or serious injury.
W0011A
DANGER
Explosion hazard!
Welding to a wheel can create an explosive air and gas mixture. Removing air from the tire or loosen-
ing the tire on the wheel (breaking the bead) will NOT eliminate the hazard. ALWAYS remove the tire
completely from the wheel before welding.
Failure to comply will result in death or serious injury.
D0033A
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8. SERVICE MANUAL
HYDRAULIC, PNEUMATIC, ELECTRICAL, ELECTRONIC SYSTEMS
Patriot 4430
84534618 27/08/2011
A

9. Contents
HYDRAULIC, PNEUMATIC, ELECTRICAL,
ELECTRONIC SYSTEMS - A
PRIMARY HYDRAULIC POWER SYSTEM................................................ A.10.A
Patriot 4430
ELECTRICAL POWER SYSTEM .......................................................... A.30.A
Patriot 4430
LIGHTING SYSTEM........................................................................ A.40.A
Patriot 4430
FAULT CODES ............................................................................. A.50.A
Patriot 4430
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A

10. HYDRAULIC, PNEUMATIC, ELECTRICAL,
ELECTRONIC SYSTEMS - A
PRIMARY HYDRAULIC POWER SYSTEM - 10.A
Patriot 4430
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11. Contents
HYDRAULIC, PNEUMATIC, ELECTRICAL, ELECTRONIC
SYSTEMS - A
PRIMARY HYDRAULIC POWER SYSTEM - 10.A
TECHNICAL DATA
PRIMARY HYDRAULIC POWER SYSTEM
Torque . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
General specification - Hydraulic system pressures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Valve
Torque - Manifold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Valve block
Torque - Two and six section valve bank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
FUNCTIONAL DATA
PRIMARY HYDRAULIC POWER SYSTEM
Hydraulic symbol - Schematic components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Hydraulic symbol - Pressure control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Hydraulic symbol - Directional control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Hydraulic symbol - Composite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Hydraulic symbol - Flow control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Hydraulic symbol - Table of symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Overview - Cylinder system troubleshooting chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Hydraulic pump
Fixed displacement pump - Overview - Gear pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Valve block
Overview - Two section valve bank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Overview - Six section valve bank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Identification - Two section valve bank axle/boom height electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Identification - Six section valve bank functions electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Pressure/flow compensating (PFC) pump
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
SERVICE
Hydraulic pump
Fixed displacement pump - Remove - Gear pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Fixed displacement pump - Install - Gear pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Fixed displacement pump - Test - Gear pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
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12. Reservoir
Remove - Hydraulic tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Install - Hydraulic tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Oil cooler
Remove . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Install . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Valve
Remove - Manifold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Disassemble - Manifold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Assemble - Manifold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Install - Manifold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Test - Manifold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Test - Two section valve bank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Test - Six section valve bank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Test - Six section valve bank relief valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Adjust - Six section valve bank relief valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Valve block
Remove - Two section valve bank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Disassemble - Two section valve bank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Assemble - Two section valve bank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Install - Two section valve bank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Remove - Six section valve bank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Disassemble - Six section valve bank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Assemble - Six section valve bank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Install - Six section valve bank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
Test - Solenoid function test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Pressure/flow compensating (PFC) pump
Remove . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Install . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
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13. HYDRAULIC, PNEUMATIC, ELECTRICAL, ELECTRONIC SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM
PRIMARY HYDRAULIC POWER SYSTEM - Torque
NOTICE: Plugs or fittings installed into aluminum housings should always be torqued to the lower values specified
for internal hex plugs of the same size.
NOTE: If any plugs or fittings are removed from the pump or motor during servicing, they should be torqued as indi-
cated below.
NOTE: Always install new O-rings before reinstalling the plugs or fittings.
Description Torque
Pump/Fitting 7/16-20 O-ring 20 N·m (14.8 lb ft)
Pump/Fitting 9/16-18 O-ring 37 N·m (27.3 lb ft)
Pump/Fitting 3/4-16 O-ring 68 N·m (50.2 lb ft)
Pump/Fitting 7/8-14 O-ring 95 N·m (70.1 lb ft)
Pump/Fitting 1-1/16-12 O-ring 163 N·m (120.2 lb ft)
Pump/Fitting 1-5/16-12 O-ring 190 N·m (140.1 lb ft)
Compensated Pump Mounting Bolts 67.8 - 74.6 N·m (50.0 - 55.0 lb ft)
PRIMARY HYDRAULIC POWER SYSTEM - General specification -
Hydraulic system pressures
Description Specification
Pressure compensated pump setting
• 90 and 120 ft. boom
189.6 bar (2750 psi)
• 100 ft boom
203.4 bar (2950 psi)
Pressure compensated pump flow (maximum)
• Check at 2200 RPM.
58.7 l/min (15.5 US gpm)
Auxiliary gear pump flow (maximum)
• Check at 2200 RPM.
70.8 l/min (18.7 US gpm)
Product pump circuit relief valve setting
• Check at 2200 RPM.
172.3 bar (2500 psi)
Inner boom fold relief valve settings
Port A 203.4 bar (2950 psi)
Port B 103.4 bar (1500 psi)
Boom level relief valve setting 13.8 bar (200 psi)
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14. HYDRAULIC, PNEUMATIC, ELECTRICAL, ELECTRONIC SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM
Valve - Torque - Manifold
Description Torque
Manifold Valve 1255-8 Plugs 47.5 N·m (35.0 lb ft)
Manifold Valve 1255-6 Plugs 25.4 N·m (225 lb in)
Manifold Valve #8 Morb x #6 90° fitting 65.1 N·m (48 lb ft)
Manifold Valve #12 Morb x #8 Straight fitting 101.7 N·m (75 lb ft)
Manifold Valve #12 Morb x #12 90° fitting 122.1 - 149.1 N·m (90 - 110 lb ft)
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15. HYDRAULIC, PNEUMATIC, ELECTRICAL, ELECTRONIC SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM
Valve block - Torque - Two and six section valve bank
Description Torque
Two Section Valve Bank 3/4 Way Solenoid Valve 29.8 N·m (22 lb ft)
Two Section Valve Bank 12 Volt DC Coil Nut 4 N·m (3.0 lb ft)
Two Section Valve Bank Check Valve 40.7 N·m (30.0 lb ft)
Two Section Valve Bank Orifice Plug 4 N·m (3.0 lb ft)
Two Section Valve Bank SAE 2 Plug 8.1 N·m (6.0 lb ft)
Two Section Valve Bank SAE -6MB x 60 FS Adapter 31.2 N·m (23.0 lb ft)
Two Section Valve Bank SAE -6MB x 60 FS Adapter
(90° Bend)
31.2 N·m (23.0 lb ft)
Six Section Valve Bank Solenoid Valve 29.8 N·m (22.0 lb ft)
Six Section Valve Bank 12 Volt Coil Nut 4 N·m (3.0 lb ft)
Six Section Valve Bank Relief Valve 3.78 L at 13.78 Bar
(1 GPM at 200 PSI)
40.7 N·m (30 lb ft)
Six Section Valve Bank Relief Valve 3.78 L at 103.35
Bar (1 GPM at 1500 PSI)
50.2 N·m (37.0 lb ft)
Six Section Valve Bank Relief Valve 3.78 L at 203.25
Bar (1 GPM at 2950 PSI)
50.2 N·m (37.0 lb ft)
Six Section Valve Bank Check Valve 50.2 N·m (37.0 lb ft)
Six Section Valve Bank Check Valve 40.7 N·m (30.0 lb ft)
Six Section Valve Bank 0.125 in. Internal Hex Head SAE
2 Plug
8.1 N·m (6.0 lb ft)
Six Section Valve Bank 0.125 in. Internal Hex Head SAE
4 Plug
19 N·m (14 lb ft)
Six Section Valve Bank 0.3125 in. Internal Hex Head
SAE 6 Plug
56.9 N·m (42.0 lb ft)
Six Section Valve Bank SAE -6MB x -60FS Adapter 31.2 N·m (23.0 lb ft)
Six Section Valve Bank SAE -6MB x -60FS Adapter (90°
Bend)
31.2 N·m (23.0 lb ft)
Six Section Valve Bank SAE -8MB x 80FS Adapter
(90°Bend)
56.9 N·m (42.0 lb ft)
Six Section Valve Bank Orifice Plug (1/16 in. NPTF With
0.039 in. Orifice)
6.8 N·m (5.0 lb ft)
Six Section Valve Bank Orifice Plug (1/16 in. NPTF With
0.069 in. Orifice)
6.8 N·m (5.0 lb ft)
Six Section Valve Bank Hollow Lock Plug 5.4 N·m (4 lb ft)
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16. HYDRAULIC, PNEUMATIC, ELECTRICAL, ELECTRONIC SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM
PRIMARY HYDRAULIC POWER SYSTEM - Hydraulic symbol -
Schematic components
Accurate diagrams of hydraulic circuits are essential to the technician who must repair them. The diagram shows
how the components interact. The diagram shows how the system works, what each component should be doing and
where the oil should be going so the technician can diagnose and repair the system.
There are two types of circuit diagrams:
• Cutaway circuit diagrams show the internal construction of the components as well as the flow paths. Using
colors, shades or various patterns in the lines and passages, they show many different conditions of flow and
pressure. Cutaway diagrams take considerably longer to produce because of their complexity.
• Schematic circuit diagrams, the “shorthand” system of the industry, are usually preferred for troubleshooting. A
schematic diagram is made up of simple geometric symbols for the components and their controls and connec-
tions.
There are several systems of symbols used when making schematic diagrams:
• ISO – International Standards Organization
• ANSI – American National Standards Institute
• ASA – American Standards Association
• JIC – Joint Industry Conference
A combination of symbols from these systems are shown. There are differences between the symbol systems. There
is enough similarity, however, so if you understand the symbols shown, you will be able to interpret other symbols as
well.
Reservoirs
A rectangle with the top removed represents a vented
reservoir (A). A rectangle with the top in place represents
a pressurized reservoir (B).
RCIL07CCH025AAA 1
There are other schematic diagrams that show a slightly
different version of a pressurized reservoir, but the sym-
bols are similar and easily recognized. An oval with a
short line on top or a rectangle with curved sides repre-
sents a reservoir that is pressurized.
RCIL07CCH027AAA 2
Lines connected to the reservoir usually are drawn from
the top, regardless of where the actual connection is. This
symbol shows a line which returns fluid above the level in
the reservoir.
RCIL07CCH030AAA 3
If the hydraulic line returns fluid below the level in the
reservoir, it is drawn all the way to the bottom of the sym-
bol.
RCIL07CCH032AAA 4
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17. HYDRAULIC, PNEUMATIC, ELECTRICAL, ELECTRONIC SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM
A hydraulic line connected to the bottom of the reservoir
may be drawn from the bottom of the symbol if the bottom
connection is essential to the systems operation.
RCIL07CCH033AAA 5
If the pump inlet (B) must be charged or flooded with fluid
above the inlet port, the reservoir symbol (A) appears
above the pump symbol, and the suction line is drawn out
of the bottom of the reservoir symbol.
Every system reservoir has at least two hydraulic lines
connected to it, and some may have many more. Often
the components that are connected to the reservoir are
spread all over the schematic. Rather than multiplying
lines all over the schematic, individual reservoir symbols
are drawn close to the components. The reservoir is usu-
ally the only component symbol pictured more than once
on a diagram.
RCIL07CCH124AAA 6
Lines, tubes and hoses
A hydraulic line, tube, hose or any conductor that carries
the fluid between components is shown as a line. A work-
ing line, such as an inlet pressure or return, is shown as
a solid line.
RCIL07CCH034AAA 7
Working lines with arrows show direction of flow. In the
first example (A), fluid flows in one direction only; in the
second example (B), fluid can flow in both directions.
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Pilot or control lines (A) are broken into long dashes.
Drain lines (B) for leakage oil are broken into short
dashes.
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A flexible line is shown as an arc between two dots and is
always represented by a solid line.
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18. HYDRAULIC, PNEUMATIC, ELECTRICAL, ELECTRONIC SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM
An enclosure outline indicates that there are several sym-
bols that make up a component assembly such as a valve
or a valve stack. The enclosure outline is rectangular and
is broken with dashes on all sides.
RCIL07CCH028AAA 11
Lines between components are drawn differently when
they are crossing or connected. There are lines that cross
other lines but are not connected. There are several ways
to show crossing lines which are not connected.
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Lines that are connected are shown with a dot that repre-
sents the connection or shown as a tee connection. The
dot connection is the most commonly used when drawing
schematic diagrams.
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Pumps
There are many basic pump designs. A simple fixed dis-
placement pump (A) is shown as a circle with a solid ar-
row that pointing outward. The arrow points in the direc-
tion that the fluid flows. If the pump is reversible (B) or
designed to pump in either direction, the symbol has two
arrows which point in opposite directions. The pump nor-
mally has a pressure port and line (1) from which pressur-
ized fluid is discharged and a suction port and line (2) into
which fluid is drawn from the reservoir.
RCIL07CCH048AAA 14
A variable displacement pump (A) is shown by an arrow
drawn through the pump symbol at a 45 degree angle. A
variable displacement, pressure compensated pump (B)
is shown by a small box with an arrow, added to the side
of the pump symbol.
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If the pump is controlled by a lever (A) or a pedal (B), the
appropriate symbol is added to the side of the pump.
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20. HYDRAULIC, PNEUMATIC, ELECTRICAL, ELECTRONIC SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM
A drive shaft is shown as two short parallel lines extending
from the side of the pump. A curved arrow, if present, on
the drive shaft indicates the direction of rotation.
RCIL07CCH049AAA 17
Motors
Motor symbols are circles with solid black arrows, which
point in the opposite direction of a pump’s arrow, to show
the motor as a receiver of fluid. One arrow is used for
non-reversible motors (A); and two arrows are used for
reversible motors (B).
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A simple schematic diagram is shown of a hydraulic motor
(A) connected to a hydraulic pump (B).
RCIL07CCH046AAA 19
Cylinders
A cylinder is a simple rectangle (A) representing the bar-
rel. The piston and rod are represented by a tee (B), in-
serted into the rectangle. The symbol can be drawn in any
position.
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21. HYDRAULIC, PNEUMATIC, ELECTRICAL, ELECTRONIC SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM
If the cylinder is single-acting (A), there is only one port
shown on the end of the cylinder that receives pressurized
fluid. The opposite end of the cylinder is left open. Both
ends are closed on a double-acting cylinder (B), and two
ports are shown.
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A double rod end cylinder has a rod extending from each
end of the rectangle.
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Some cylinders have cushions built into them. The cush-
ion slows the movement of the piston as it nears the end of
its stroke. Cylinder cushions are shown as a smaller rec-
tangle (A) on the piston. If the cushion has an adjustable
orifice, a slanted arrow is drawn at 45 degrees (B) across
the symbol.
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Accessories
Filters, strainers and heat exchangers are represented as
squares that are turned 45 degrees and have the port
connections at the corners.
A dotted line perpendicular to the flow line represent a
filter, strainer or screen.
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22. HYDRAULIC, PNEUMATIC, ELECTRICAL, ELECTRONIC SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM
A solid line perpendicular to the flow with solid arrows
pointing outward represents a cooler.
RCIL07CCH081AAA 25
The symbol for a heater is like the symbol for a cooler,
except the solid arrows point inward.
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Two sets of arrows pointing inward and outward repre-
sents a temperature control unit
The solid arrows point in the direction that heat is dissi-
pated. Or in the case of the control unit, they show that
heat can be regulated.
RCIL07CCH119AAA 27
An oval with details inside represents an accumulator.
The details explain what type of accumulator it is: spring
loaded (A), gas charged (B), or other features.
The divider line indicates there is a separator between the
charge and the fluid. A hollow arrow indicates gas.
A spring indicates that the accumulator is spring-loaded.
RCIL07CCH130AAA 28
PRIMARY HYDRAULIC POWER SYSTEM - Hydraulic symbol - Pressure control (A.10.A)
PRIMARY HYDRAULIC POWER SYSTEM - Hydraulic symbol - Directional control (A.10.A)
PRIMARY HYDRAULIC POWER SYSTEM - Hydraulic symbol - Composite (A.10.A)
PRIMARY HYDRAULIC POWER SYSTEM - Hydraulic symbol - Flow control (A.10.A)
Reference:
PRIMARY HYDRAULIC POWER SYSTEM - Hydraulic symbol - Table of symbols (A.10.A)
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23. HYDRAULIC, PNEUMATIC, ELECTRICAL, ELECTRONIC SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM
PRIMARY HYDRAULIC POWER SYSTEM - Hydraulic symbol -
Pressure control
The basic valve symbol is a square (which is called an
envelope) with external port connections and an arrow
inside to show the fluid passage and direction of flow. The
valve usually operates by balancing fluid pressure against
a spring, so a spring is shown on one side of the symbol
and a pilot pressure line on the other side.
Normally closed valve
A normally closed valve, such as a relief or sequence
valve, is shown with an arrow offset from the ports [in-
let (A), outlet (B)] toward the pilot pressure line (C) side
of the square. The spring (D) holds the valve closed until
the pilot line pressure is greater than the spring pressure.
Mentally visualize a build up of pressure in the pilot line
and the envelope moving over, compressing the spring.
Fluid can now flow through the valve.
RCIL07CCH059AAA 1
Normally open valve
A normally open valve is shown with the arrow connecting
the inlet and outlet ports. It closes when pressure over-
comes spring force. Mentally visualize a build up of pres-
sure in the pilot line and the envelope moving over, com-
pressing the spring. Fluid flow through the valve is now
blocked.
RCIL07CCH060AAA 2
Relief valve
A relief valve is shown as a normally closed symbol con-
nected between the pressure line (A) and the reservoir
(B). The flow direction arrow points away from the pres-
sure line port and toward the reservoir. This graphically
represents how a relief valve operates. When pressure in
the system overcomes the valve spring (C), flow is from
the pressure line through the relief valve to the reservoir.
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