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Service Information
Document Title: Function Group: Information Type: Date:
Description, general 900 Service Information 2014/12/22
Profile:
EXC, EC210C L, EC160C L, EC180C L [GB]
Description, general
The machine is equipped with a positive flow control system with variable flow. With this system, the working pump can
deliver flow according to demand. A variable flow from the pump allows precision work even with high engine speed.
The hydraulic system, also known as the “Automatic Sensing Work Mode,” is designed for high-productivity, high-digging
capacity, high-maneuvering precision and excellent fuel economy. The summation system, boom, arm and swing priority
along with boom and arm regeneration provides optimum performance.
The following important functions are included in the system:






Summation system: Combines the flow of both hydraulic pumps to ensure quick cycle times and high productivity.
Boom priority: Gives priority to the boom operation for faster raising when loading or performing deep excavations.
Swing priority: Gives priority to swing functions for faster simultaneous operations.
Regeneration system: Prevents cavitation and provides flow to other movements during simultaneous operations
for maximum productivity.
Power boost: All digging and lifting forces are increased.
Holding valves: Boom and arm holding valves prevent the digging equipment from creeping.
The following functions are included in the main control valve :






Boom
Dipper arm
Bucket
Slew
Travel
Optional equipment, X1
The optional control valve has the following functions:



Adjustable boom, X2
Optional equipment, X3
line rupture for boom and arm
Service Information
Document Title: Function Group: Information Type: Date:
Hydraulic system,
description
900 Service Information 2014/12/22
Profile:
EXC, EC160C L, EC180C L [GB]
Hydraulic system, description
The machine's hydraulic system is divided into two subsystems - the working hydraulic system and servo hydraulic system.
All power transmission is via hydraulic oil in the working hydraulic system.
A working pump supplies the main valve block with oil. The main valve block distributes the oil to the digging equipment's
four (five split boom) hydraulic cylinders and the two hydraulic motors for travel and slew. The flow of oil to the different
movements is controlled with valve spools in directional valves.
The servo hydraulic system is used for control.
A servo pump supplies the control levers and pedals with servo pressure. When the machine is operated, the control
pressure valves reduce the servo pressure to a control pressure, which activates the directional valves.
Service Information
Document Title: Function Group: Information Type: Date:
Hydraulic oil, description 900 Service Information 2014/12/22
Profile:
EXC, EC460C L, EC330C L, EC240C L, EC290C L, EC360C L, EC180C L, EC160C L, EC210C L [GB]
Hydraulic oil, description
The oil contains selected additives that provide good oxidation stability, corrosion protection and good lubricating
characteristics as well as compatibility with bearings containing lead alloys.
The ester base gives the oil a very high viscosity index and good characteristics at low temperatures.
Service Information
Document Title: Function Group: Information Type: Date:
Hydraulic system, repair of
hydraulic components in
workshop
900 Service Information 2014/12/22
Profile:
EXC, EC210C L, EC160C L, EC180C L, EC460C L, EC330C L, EC240C L, EC290C L, EC360C L [GB]
Hydraulic system, repair of hydraulic components in workshop









Always wear clean coveralls and be strict about personal cleanliness.
Work on hydraulic components should be performed separate from other work in a so-called "clean room". The
room must have good ventilation and the floor must be coated with a binding material. Machining, grinding and
similar work is not allowed in the "clean room".
The workplace must be equipped with thoroughly cleaned tools and suitable containers for cleaning hydraulic
components.
Containers for cleaning hydraulic components must not be used for other cleaning. The containers must be cleaned
frequently and filled with new fluid. The containers must be equipped with a removable grating on the bottom,
which separates the component from any sludge on the bottom.
Always clean components that are going to be handled in the "clean room". If an alkaline detergent is used, it
should contain anti-corrosion agent.
Always plan work on the hydraulic system so that it can be completed without any longer interruptions.
When cleaning during repairing – use dry and clean compressed air for drying, do not use cotton waste or rags.
Always plug a component when work is completed, use clean plastic plugs of the correct dimensions, and pack the
component.
When cleaning in the "clean room" – use methods that do not stir up dust or dirt.
Service Information
Document Title: Function Group: Information Type: Date:
Hydraulic oil, storage and
handling
900 Service Information 2014/12/22
Profile:
EXC, EC210C L, EC160C L, EC180C L, EC460C L, EC330C L, EC240C L, EC290C L, EC360C L [GB]
Hydraulic oil, storage and handling




Hydraulic oil should be stored in tightly sealed tanks or barrels.
Only containers used for transporting hydraulic oil should be used for this purpose.
Oil should be stored under cover or in temperature-controlled premises. If oil is stored outdoors, the barrels should
be stored horizontally so that water cannot enter and the barrel markings are not eradicated.
Oil must not be stored at temperatures exceeding 60 °C, or be exposed to direct sunlight or freezing temperatures.
Service Information
Document Title: Function Group: Information Type: Date:
Hydraulic system,
cleanliness when handling
hydraulic components
900 Service Information 2014/12/22
Profile:
EXC, EC210C L, EC160C L, EC180C L, EC460C L, EC330C L, EC240C L, EC290C L, EC360C L [GB]
Hydraulic system, cleanliness when handling hydraulic components
WARNING
Hot hydraulic oil and hydraulic oil under pressure may result in severe personal injuries
NOTICE
It is very important to keep the hydraulic system free from any impurities, as these can cause abnormal wear and
may lead to expensive downtime. Greatest possible cleanliness should be maintained during all handling of
hydraulic components and hydraulic oil.
NOTE!
A vacuum pump should be used for work on the hydraulic system, see .
900 Vacuum pump, connection
Service Information
Document Title: Function Group: Information Type: Date:
Hydraulic components,
storage and transport
900 Service Information 2014/12/22
Profile:
EXC, EC210C L, EC160C L, EC180C L, EC460C L, EC330C L, EC240C L, EC290C L, EC360C L [GB]
Hydraulic components, storage and transport



All hydraulic components must be stored in plastic bags or film and they must be plugged. The packaging must not
be opened before use of the component.
Service vehicles should be equipped with an interior which facilitates good order and cleanliness.
Each service vehicle should carry a roll of plastic film, plastic plugs of the most common sizes and plastic containers
for components. Plugs and film should be of the disposable type.
Service Information
Document Title: Function Group: Information Type: Date:
Hydraulic system, work
instructions
910 Service Information 2014/12/22
Profile:
EXC, EC210C L, EC160C L, EC180C L, EC460C L, EC330C L, EC240C L, EC290C L, EC360C L [GB]
Hydraulic system, work instructions







Always wear clean coveralls and be strict about personal cleanliness.
Perform thorough troubleshooting to avoid unnecessary repair work.
If necessary, move the machine, to as dust-free an environment as possible.
If possible, do not dismantle components in the field. Use exchange components.
Protect both replaced components and components that are to be reused by wrapping them in plastic film.
If the tank is to be drained, and the oil has been found to be free of discolouration and impurities – drain the oil
into clean containers, and seal securely. Refilling of this oil or filling of new oil should always be performed by
removing the hydraulic oil filter cap and then filling through the filter.
Use a suitable fluid when cleaning and pour it into a thoroughly cleaned container.
Service Information
Document Title: Function Group: Information Type: Date:
Hydraulic components,
description
910 Service Information 2014/12/22
Profile:
EXC, EC210C L, EC160C L, EC180C L [GB]
Hydraulic components, description
This machine incorporates the features and functions described below in its hydraulic circuit in order to provide easier
operation, greater safety, higher productivity, and better fuel economy.
Function of components
Purpose Component Function Feature
Travel



Controlled by servo hydraulic
pressure
Straight travel
Low speed, low/high speed
automatic shift


Straight travel during simultaneous
operations.
Automatic shifting between low and high
speed.
Ease of
operation
and safety
Slew



Slew priority circuit (during
simultaneous slew and arm
in)
Automatic slew parking
brake
Rebound damping function



Easier digging due to the use of
simultaneous slew and arm in.
Delayed slew parking brake application
during slew to allow for inertia.
Damping by rebound damping valve.
Digging units






Controlled by servo hydraulic
pressure
Boom priority circuit (during
simultaneous loading or
performing deep
excavations)
Arm priority circuit (during
simultaneous digging)
Boom, arm and bucket
regenerating circuit
Holding valve (boom, arm
lock)
Heavy lift and heavy duty
digging




Fine operation.
Changing the balance between boom, arm
and bucket functions.
Decreasing the amount of natural fall of
boom when the boom is at rest.
Increasing the working pressure by
increasing the pressure of main relief
valve.
Others






Closed and semi
automatically pressurized
hydraulic tank
Suction strainer
Return line: filter and drain
filter
Servo hydraulic circuit: line
filter
Hydraulic oil cooled by oil
cooler
Emergency circuit






Contamination of hydraulic oil prevented,
suction ability of pump improved.
Damage of hydraulic components
prevented.
Contamination of hydraulic oil prevented.
Servo hydraulic operated circuit failure
prevented.
Deterioration of hydraulic oil prevented.
If engine stopped, movable by weight of
digging units.
Pump
 Full horsepower control  Effective use of engine horsepower though
action of two variable displacement
pumps.
Productivity
increased
Travel
 2–speed auto shift by the 2–
speed track motor


Low speed/high propel torque.
High speed/low propel torque.
Digging units







Conflux for boom raising
Regeneration for boom
lowering
Conflux circuit for arm in
under heavy load
Conflux circuit for arm in
under light load
Conflux circuit for arm out
Conflux circuit for X1
(option)
Pressure increasing circuit for
heavy load







Faster boom raising.
Positive bucket motion during
simultaneous boom lowering and bucket
operation.
Faster arm in under heavy load.
Faster arm in under light load.
Faster arm out.
Faster X1 operation.
Improved digging, lifting under heavy
load.
Pump
 Positive flow control  Flow minimized when in neutral
Fuel economy
Controller


Mode select switch
changeover
Auto idling


Selecting an effective engine rpm suited
for the amount of work, fuel consumption
and fine control.
Engine speed decelerated during waiting
periods for reduced fuel cost and less
noise.
Service Information
Document Title: Function Group: Information Type: Date:
Hydraulic diagram,
schematic
910 Service Information 2014/12/22
Profile:
EXC, EC160C L, EC180C L [GB]
Hydraulic diagram, schematic
Figure 1
Hydraulic diagram
1 Hydraulic hammer (X1) 8 Fan motor 15 Remote control valve (lever)
2 Arm cylinder 9 Rotator (X3) 16 Remote control valve (pedal)
3 Dozer blade cylinder 10 Travel motor (left) 17 Remote control valve (pedal)
4 Quckfit cylinder 11 Center passage 18 Engine
5 Bucket cylinder 12 Travel motor (right) 19 Main hydraulic oil pump
6 Boom cylinder 13 Slew motor 20 Servo hydraulic oil pump
7 Adjustable boom
cylinder (X2)
14 Main control valve 21 Gear pump (fan motor, rotator (X3)
The mechanical power from the engine is converted to hydraulic power by the main pumps. Hydraulic power from the main
pumps goes to the track motors, slew motor and hydraulic cylinders via the control valve, where it is converted back to
mechanical power, which actuates the travel action, slew action and digging units.
Service Information
Document Title: Function Group: Information Type: Date:
Hydraulic system, position
of main components
910 Service Information 2014/12/22
Profile:
EXC, EC160C L, EC180C L [GB]
Hydraulic system, position of main components
See 990 Hydraulic diagram, with option components
Figure 1
Hydraulic system's main components
1 Main pump 23 Fan motor 46 Solenoid valve (float
position)
2 Main control valve 24 Hydraulic oil cooler 47 Boom hose rupture valve
3 Slew motor 25 Return filter 48 Arm hose rupture valve
4 Track motor 26 Bypass valve 49 Non leak valve (S)
5 Boom cylinder 27 Bypass strainer 50 Non leak valve (L)
6 Arm cylinder 28 Suction strainer 51 Quickfit valve
7 Bucket cylinder 29 Hydraulic oil tank 52 Adjustable boom cylinder
8 Servo hydraulic oil filter 30 Air breather 53 Adjustable boom valve
9 Accumulator block 31 Drain filter 54 Remote control valve (X2
pedal)
10 Accumulator 32 Check valve : 0.147 MPa (1.5 kgf/
cm2) (21 psi) (1.47 bar)
55 Servo hydraulic block
11 Solenoid valve 33 Check valve : 0.44 MPa (4.5 kgf/cm2)
(64 psi) (4.4 bar)
56 Servo hydraulic block
12 Solenoid valve 34 Solenoid valve (Hammer & Shear 57 Servo hydraulic block
13 Remote control valve (lever), left 35 Proportional valve (PWM9109) 58 Servo hydraulic block
14 Remote control valve (lever) - right 36 Control pattern selector valve 59 Shuttle valve
15 Remote control valve (pedal) 37 Remote control valve (X1 pedal -
option)
61 Time delay valve
16 Remote control valve (Straight travel ) 38 X1 proportional valve 62 Servo hydraulic oil pump
17 Center passage 39 Solenoid valve (2 pump flow) 63 Check valve
18 Shuttle valve (travel) 40 Solenoid valve (thumb bucket) 64 Check valve
19 Shuttle valve (Straight travel) 41 3-way selector valve 65 Dozer blade cylinder
20 Shuttle valve (attachment) 43 X3 proportional valve) 66 Dozer blade cylinder
21 Gear pump (cooling and X3) 44 X3 valve 67 Remote control valve (Dozer
blade )
22 Proportional relief valve (PWM9103) 45 Float position valve 68 Shuttle valve (Dozer blade )
Service Information
Document Title: Function Group: Information Type: Date:
Hydraulic tank, description Service Information 2014/12/22
Profile:
EXC, EC210C L, EC160C L, EC180C L [GB]
Hydraulic tank, description
The hydraulic oil tank is a welded sheet metal construction which stores the hydraulic oil and facilitates separation of
impurities, water and air.
The hydraulic oil tank is common to the working and servo hydraulic system. The tank is equipped with a monitor for the
return filter and sensor for oil temperature. The oil level can be read off manually on the level indicator which is mounted on
the hydraulic oil tank left side of the hydraulic oil pump room.
Figure 1
Structure, hydraulic tank
1 Hydraulic tank 8 Spring 15 Spring washer
2 Strainer (80 mesh) 9 Bypass valve 16 Screw
3 Plug 10 Drain valve 17 Screw
4 Sight gauge 11 Shim 18 O-ring
5 Air breather 12 Spring washer 19 O-ring
6 Element strainer 13 Plain washer 20 O-ring
7 Strainer-by pass 14 Screw 21 Copper gasket
S Side door
F Fuel tank
Tightening torque : unit : kgf·m (lbf·ft)
No. Tightening torque
3 2.5 ± 0.3 (18 ± 2.2)
4 1.5 ± 0.2 (10.8 ± 1.4)
10 4.5 ± 0.5 (32.5 ± 3.6)
14 52.2 ± 5.2 (377 ± 38)
16 6.5 ± 0.7 (47 ± 5)
17 0.3 ~ 0.6 (2.2 ~ 4.3)





To check the oil level, park on a level surface, retract the arm cylinder, extend the bucket cylinder, lower the bucket
to the ground and stop the engine.
Operate each control lever (for digging unit and travel) to its full stroke to release the residual pressure.
The center line of the sight gauge is normal. Add oil when required.
Figure 2
Oil level sight gauge
When mounting the tank, make the bottom level with frame by use of shim (11).
Maintain the clearance (front, rear, left, right) within 10 mm (0.4 in).
Oil filter bypass valve
When the filter is clogged
Figure 3
Oil flow, when the filter is clogged
A. From main control valve
Bypass valve (1) is opened and the oil returns directly to the tank without passing through the filter.
NOTE!
Bypass valve set pressure : 1.5 ± 0.15 kgf/cm2 (21.3 ± 2.1 psi)
Air breather
Preventing negative pressure inside the tank
The tank is a pressurized sealed type, so negative pressure is formed inside the hydraulic tank when the oil level drops
during operations. When this happens, the difference in pressure between the tank and the outside atmospheric pressure
opens the poppet in the breather, and air from the outside is let into the tank to prevent negative pressure.
At that time filter (2) prevents contamination from entering the tank.
1) Relief set pressure : 0.5 ± 0.1 kgf/cm2 (7 ± 1.4 psi)
2) Suction set pressure : 0.05 ± 0.01 kgf/cm2 (0.7 ± 0.14 psi)
Preventing excessive pressure inside the tank
When the hydraulic actuators are operated, the oil level in the hydraulic system increases as temperature rises. If the
hydraulic pressure rises exceeding the set pressure, the breather is actuated to release the hydraulic pressure inside the tank.
Figure 4
Air breather
1 Body 3 Cap
2 Filter 4 Valve
Hydraulic tank pressurizing
The hydraulic tank is pressurized to create a positive pressure at the hydraulic pump inlet to prevent cavitation.
If the tank cap assembly does not function or seal properly, the hydraulic pump could be damaged.
To pressurize the tank, raise the boom to maximum height, extend the arm and bucket cylinders, then lower the boom to
the ground.
To prevent hydraulic oil ejection due to the tank internal pressure while hydraulic system maintenance, press the inner
button several times to release the pressure until the air is all out.
Service Information
Document Title: Function Group: Information Type: Date:
Hydraulic oil tank, vacuum-
pumping, connecting and
disconnecting pump
Service Information 2014/12/22
Profile:
EXC, EC160C L, EC210C L, EC180C L, EC240C L, EC290C L [GB]
Hydraulic oil tank, vacuum-pumping, connecting and disconnecting
pump
Op nbr 911-040
14 360 000 Vacuum pump
NOTICE
Connection of the vacuum pump must be performed with the diesel engine off. The air filter is placed above the
filtered hydraulic oil. Therefore, carefully clean the surfaces closest to the filter. Do not leave the connection to the
filter open for longer than it takes to fit the adapter.
NOTE!
There is always a risk of air entering the hydraulic system when using a vacuum pump.
NOTE!
See : 9111 Breather, replacing
1. Place the vacuum pump on the hydraulic oil tank.
Figure 1
Remove air breather
2. Remove screws (1) and air breather (2) from hydraulic oil tank (3).
3. Install adapter (2) and connect hose (1) to the adapter.
Figure 2
Connection of vacuum pump
1.
2.
3.
Hose
Adapter
Vacuum pump
4. Connect the plug to the 24 V socket behind the operator's cab.
5. Start the vacuum pump.
6. Run the pump for 2–3 minutes until a negative pressure reading of –30 kPa (–4.35 psi) is obtained.
7. Adjust the vacuum pressure with the adjusting knob so that oil leakage will not occur during work on the hydraulic
system.
Figure 3
Vacuum pump
1. Adjusting knob
IMPORTANT! The pressure must not fall below –30 kPa (–4.35 psi), as otherwise there is a risk of damage to the
hydraulic oil tank.
8. Turn off the electric power to the vacuum pump.
9. Remove the plug from the 24V socket.
10. Remove the hose from the adapter.
11. Remove the adapter and immediately fit the air breather.
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for your reading.
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  • 1. Service Information Document Title: Function Group: Information Type: Date: Description, general 900 Service Information 2014/12/22 Profile: EXC, EC210C L, EC160C L, EC180C L [GB] Description, general The machine is equipped with a positive flow control system with variable flow. With this system, the working pump can deliver flow according to demand. A variable flow from the pump allows precision work even with high engine speed. The hydraulic system, also known as the “Automatic Sensing Work Mode,” is designed for high-productivity, high-digging capacity, high-maneuvering precision and excellent fuel economy. The summation system, boom, arm and swing priority along with boom and arm regeneration provides optimum performance. The following important functions are included in the system:       Summation system: Combines the flow of both hydraulic pumps to ensure quick cycle times and high productivity. Boom priority: Gives priority to the boom operation for faster raising when loading or performing deep excavations. Swing priority: Gives priority to swing functions for faster simultaneous operations. Regeneration system: Prevents cavitation and provides flow to other movements during simultaneous operations for maximum productivity. Power boost: All digging and lifting forces are increased. Holding valves: Boom and arm holding valves prevent the digging equipment from creeping. The following functions are included in the main control valve :       Boom Dipper arm Bucket Slew Travel Optional equipment, X1 The optional control valve has the following functions:    Adjustable boom, X2 Optional equipment, X3 line rupture for boom and arm
  • 2. Service Information Document Title: Function Group: Information Type: Date: Hydraulic system, description 900 Service Information 2014/12/22 Profile: EXC, EC160C L, EC180C L [GB] Hydraulic system, description The machine's hydraulic system is divided into two subsystems - the working hydraulic system and servo hydraulic system. All power transmission is via hydraulic oil in the working hydraulic system. A working pump supplies the main valve block with oil. The main valve block distributes the oil to the digging equipment's four (five split boom) hydraulic cylinders and the two hydraulic motors for travel and slew. The flow of oil to the different movements is controlled with valve spools in directional valves. The servo hydraulic system is used for control. A servo pump supplies the control levers and pedals with servo pressure. When the machine is operated, the control pressure valves reduce the servo pressure to a control pressure, which activates the directional valves.
  • 3. Service Information Document Title: Function Group: Information Type: Date: Hydraulic oil, description 900 Service Information 2014/12/22 Profile: EXC, EC460C L, EC330C L, EC240C L, EC290C L, EC360C L, EC180C L, EC160C L, EC210C L [GB] Hydraulic oil, description The oil contains selected additives that provide good oxidation stability, corrosion protection and good lubricating characteristics as well as compatibility with bearings containing lead alloys. The ester base gives the oil a very high viscosity index and good characteristics at low temperatures.
  • 4. Service Information Document Title: Function Group: Information Type: Date: Hydraulic system, repair of hydraulic components in workshop 900 Service Information 2014/12/22 Profile: EXC, EC210C L, EC160C L, EC180C L, EC460C L, EC330C L, EC240C L, EC290C L, EC360C L [GB] Hydraulic system, repair of hydraulic components in workshop          Always wear clean coveralls and be strict about personal cleanliness. Work on hydraulic components should be performed separate from other work in a so-called "clean room". The room must have good ventilation and the floor must be coated with a binding material. Machining, grinding and similar work is not allowed in the "clean room". The workplace must be equipped with thoroughly cleaned tools and suitable containers for cleaning hydraulic components. Containers for cleaning hydraulic components must not be used for other cleaning. The containers must be cleaned frequently and filled with new fluid. The containers must be equipped with a removable grating on the bottom, which separates the component from any sludge on the bottom. Always clean components that are going to be handled in the "clean room". If an alkaline detergent is used, it should contain anti-corrosion agent. Always plan work on the hydraulic system so that it can be completed without any longer interruptions. When cleaning during repairing – use dry and clean compressed air for drying, do not use cotton waste or rags. Always plug a component when work is completed, use clean plastic plugs of the correct dimensions, and pack the component. When cleaning in the "clean room" – use methods that do not stir up dust or dirt.
  • 5. Service Information Document Title: Function Group: Information Type: Date: Hydraulic oil, storage and handling 900 Service Information 2014/12/22 Profile: EXC, EC210C L, EC160C L, EC180C L, EC460C L, EC330C L, EC240C L, EC290C L, EC360C L [GB] Hydraulic oil, storage and handling     Hydraulic oil should be stored in tightly sealed tanks or barrels. Only containers used for transporting hydraulic oil should be used for this purpose. Oil should be stored under cover or in temperature-controlled premises. If oil is stored outdoors, the barrels should be stored horizontally so that water cannot enter and the barrel markings are not eradicated. Oil must not be stored at temperatures exceeding 60 °C, or be exposed to direct sunlight or freezing temperatures.
  • 6. Service Information Document Title: Function Group: Information Type: Date: Hydraulic system, cleanliness when handling hydraulic components 900 Service Information 2014/12/22 Profile: EXC, EC210C L, EC160C L, EC180C L, EC460C L, EC330C L, EC240C L, EC290C L, EC360C L [GB] Hydraulic system, cleanliness when handling hydraulic components WARNING Hot hydraulic oil and hydraulic oil under pressure may result in severe personal injuries NOTICE It is very important to keep the hydraulic system free from any impurities, as these can cause abnormal wear and may lead to expensive downtime. Greatest possible cleanliness should be maintained during all handling of hydraulic components and hydraulic oil. NOTE! A vacuum pump should be used for work on the hydraulic system, see . 900 Vacuum pump, connection
  • 7. Service Information Document Title: Function Group: Information Type: Date: Hydraulic components, storage and transport 900 Service Information 2014/12/22 Profile: EXC, EC210C L, EC160C L, EC180C L, EC460C L, EC330C L, EC240C L, EC290C L, EC360C L [GB] Hydraulic components, storage and transport    All hydraulic components must be stored in plastic bags or film and they must be plugged. The packaging must not be opened before use of the component. Service vehicles should be equipped with an interior which facilitates good order and cleanliness. Each service vehicle should carry a roll of plastic film, plastic plugs of the most common sizes and plastic containers for components. Plugs and film should be of the disposable type.
  • 8. Service Information Document Title: Function Group: Information Type: Date: Hydraulic system, work instructions 910 Service Information 2014/12/22 Profile: EXC, EC210C L, EC160C L, EC180C L, EC460C L, EC330C L, EC240C L, EC290C L, EC360C L [GB] Hydraulic system, work instructions        Always wear clean coveralls and be strict about personal cleanliness. Perform thorough troubleshooting to avoid unnecessary repair work. If necessary, move the machine, to as dust-free an environment as possible. If possible, do not dismantle components in the field. Use exchange components. Protect both replaced components and components that are to be reused by wrapping them in plastic film. If the tank is to be drained, and the oil has been found to be free of discolouration and impurities – drain the oil into clean containers, and seal securely. Refilling of this oil or filling of new oil should always be performed by removing the hydraulic oil filter cap and then filling through the filter. Use a suitable fluid when cleaning and pour it into a thoroughly cleaned container.
  • 9. Service Information Document Title: Function Group: Information Type: Date: Hydraulic components, description 910 Service Information 2014/12/22 Profile: EXC, EC210C L, EC160C L, EC180C L [GB] Hydraulic components, description This machine incorporates the features and functions described below in its hydraulic circuit in order to provide easier operation, greater safety, higher productivity, and better fuel economy. Function of components Purpose Component Function Feature Travel    Controlled by servo hydraulic pressure Straight travel Low speed, low/high speed automatic shift   Straight travel during simultaneous operations. Automatic shifting between low and high speed. Ease of operation and safety Slew    Slew priority circuit (during simultaneous slew and arm in) Automatic slew parking brake Rebound damping function    Easier digging due to the use of simultaneous slew and arm in. Delayed slew parking brake application during slew to allow for inertia. Damping by rebound damping valve. Digging units       Controlled by servo hydraulic pressure Boom priority circuit (during simultaneous loading or performing deep excavations) Arm priority circuit (during simultaneous digging) Boom, arm and bucket regenerating circuit Holding valve (boom, arm lock) Heavy lift and heavy duty digging     Fine operation. Changing the balance between boom, arm and bucket functions. Decreasing the amount of natural fall of boom when the boom is at rest. Increasing the working pressure by increasing the pressure of main relief valve.
  • 10. Others       Closed and semi automatically pressurized hydraulic tank Suction strainer Return line: filter and drain filter Servo hydraulic circuit: line filter Hydraulic oil cooled by oil cooler Emergency circuit       Contamination of hydraulic oil prevented, suction ability of pump improved. Damage of hydraulic components prevented. Contamination of hydraulic oil prevented. Servo hydraulic operated circuit failure prevented. Deterioration of hydraulic oil prevented. If engine stopped, movable by weight of digging units. Pump  Full horsepower control  Effective use of engine horsepower though action of two variable displacement pumps. Productivity increased Travel  2–speed auto shift by the 2– speed track motor   Low speed/high propel torque. High speed/low propel torque. Digging units        Conflux for boom raising Regeneration for boom lowering Conflux circuit for arm in under heavy load Conflux circuit for arm in under light load Conflux circuit for arm out Conflux circuit for X1 (option) Pressure increasing circuit for heavy load        Faster boom raising. Positive bucket motion during simultaneous boom lowering and bucket operation. Faster arm in under heavy load. Faster arm in under light load. Faster arm out. Faster X1 operation. Improved digging, lifting under heavy load. Pump  Positive flow control  Flow minimized when in neutral Fuel economy Controller   Mode select switch changeover Auto idling   Selecting an effective engine rpm suited for the amount of work, fuel consumption and fine control. Engine speed decelerated during waiting periods for reduced fuel cost and less noise.
  • 11. Service Information Document Title: Function Group: Information Type: Date: Hydraulic diagram, schematic 910 Service Information 2014/12/22 Profile: EXC, EC160C L, EC180C L [GB] Hydraulic diagram, schematic Figure 1 Hydraulic diagram 1 Hydraulic hammer (X1) 8 Fan motor 15 Remote control valve (lever) 2 Arm cylinder 9 Rotator (X3) 16 Remote control valve (pedal) 3 Dozer blade cylinder 10 Travel motor (left) 17 Remote control valve (pedal) 4 Quckfit cylinder 11 Center passage 18 Engine 5 Bucket cylinder 12 Travel motor (right) 19 Main hydraulic oil pump 6 Boom cylinder 13 Slew motor 20 Servo hydraulic oil pump 7 Adjustable boom cylinder (X2) 14 Main control valve 21 Gear pump (fan motor, rotator (X3)
  • 12. The mechanical power from the engine is converted to hydraulic power by the main pumps. Hydraulic power from the main pumps goes to the track motors, slew motor and hydraulic cylinders via the control valve, where it is converted back to mechanical power, which actuates the travel action, slew action and digging units.
  • 13. Service Information Document Title: Function Group: Information Type: Date: Hydraulic system, position of main components 910 Service Information 2014/12/22 Profile: EXC, EC160C L, EC180C L [GB] Hydraulic system, position of main components See 990 Hydraulic diagram, with option components
  • 14. Figure 1 Hydraulic system's main components 1 Main pump 23 Fan motor 46 Solenoid valve (float position) 2 Main control valve 24 Hydraulic oil cooler 47 Boom hose rupture valve 3 Slew motor 25 Return filter 48 Arm hose rupture valve
  • 15. 4 Track motor 26 Bypass valve 49 Non leak valve (S) 5 Boom cylinder 27 Bypass strainer 50 Non leak valve (L) 6 Arm cylinder 28 Suction strainer 51 Quickfit valve 7 Bucket cylinder 29 Hydraulic oil tank 52 Adjustable boom cylinder 8 Servo hydraulic oil filter 30 Air breather 53 Adjustable boom valve 9 Accumulator block 31 Drain filter 54 Remote control valve (X2 pedal) 10 Accumulator 32 Check valve : 0.147 MPa (1.5 kgf/ cm2) (21 psi) (1.47 bar) 55 Servo hydraulic block 11 Solenoid valve 33 Check valve : 0.44 MPa (4.5 kgf/cm2) (64 psi) (4.4 bar) 56 Servo hydraulic block 12 Solenoid valve 34 Solenoid valve (Hammer & Shear 57 Servo hydraulic block 13 Remote control valve (lever), left 35 Proportional valve (PWM9109) 58 Servo hydraulic block 14 Remote control valve (lever) - right 36 Control pattern selector valve 59 Shuttle valve 15 Remote control valve (pedal) 37 Remote control valve (X1 pedal - option) 61 Time delay valve 16 Remote control valve (Straight travel ) 38 X1 proportional valve 62 Servo hydraulic oil pump 17 Center passage 39 Solenoid valve (2 pump flow) 63 Check valve 18 Shuttle valve (travel) 40 Solenoid valve (thumb bucket) 64 Check valve 19 Shuttle valve (Straight travel) 41 3-way selector valve 65 Dozer blade cylinder 20 Shuttle valve (attachment) 43 X3 proportional valve) 66 Dozer blade cylinder 21 Gear pump (cooling and X3) 44 X3 valve 67 Remote control valve (Dozer blade ) 22 Proportional relief valve (PWM9103) 45 Float position valve 68 Shuttle valve (Dozer blade )
  • 16. Service Information Document Title: Function Group: Information Type: Date: Hydraulic tank, description Service Information 2014/12/22 Profile: EXC, EC210C L, EC160C L, EC180C L [GB] Hydraulic tank, description The hydraulic oil tank is a welded sheet metal construction which stores the hydraulic oil and facilitates separation of impurities, water and air. The hydraulic oil tank is common to the working and servo hydraulic system. The tank is equipped with a monitor for the return filter and sensor for oil temperature. The oil level can be read off manually on the level indicator which is mounted on the hydraulic oil tank left side of the hydraulic oil pump room. Figure 1 Structure, hydraulic tank 1 Hydraulic tank 8 Spring 15 Spring washer 2 Strainer (80 mesh) 9 Bypass valve 16 Screw 3 Plug 10 Drain valve 17 Screw 4 Sight gauge 11 Shim 18 O-ring 5 Air breather 12 Spring washer 19 O-ring 6 Element strainer 13 Plain washer 20 O-ring 7 Strainer-by pass 14 Screw 21 Copper gasket S Side door F Fuel tank Tightening torque : unit : kgf·m (lbf·ft) No. Tightening torque
  • 17. 3 2.5 ± 0.3 (18 ± 2.2) 4 1.5 ± 0.2 (10.8 ± 1.4) 10 4.5 ± 0.5 (32.5 ± 3.6) 14 52.2 ± 5.2 (377 ± 38) 16 6.5 ± 0.7 (47 ± 5) 17 0.3 ~ 0.6 (2.2 ~ 4.3)      To check the oil level, park on a level surface, retract the arm cylinder, extend the bucket cylinder, lower the bucket to the ground and stop the engine. Operate each control lever (for digging unit and travel) to its full stroke to release the residual pressure. The center line of the sight gauge is normal. Add oil when required. Figure 2 Oil level sight gauge When mounting the tank, make the bottom level with frame by use of shim (11). Maintain the clearance (front, rear, left, right) within 10 mm (0.4 in). Oil filter bypass valve When the filter is clogged Figure 3 Oil flow, when the filter is clogged A. From main control valve Bypass valve (1) is opened and the oil returns directly to the tank without passing through the filter. NOTE! Bypass valve set pressure : 1.5 ± 0.15 kgf/cm2 (21.3 ± 2.1 psi) Air breather Preventing negative pressure inside the tank The tank is a pressurized sealed type, so negative pressure is formed inside the hydraulic tank when the oil level drops during operations. When this happens, the difference in pressure between the tank and the outside atmospheric pressure opens the poppet in the breather, and air from the outside is let into the tank to prevent negative pressure. At that time filter (2) prevents contamination from entering the tank. 1) Relief set pressure : 0.5 ± 0.1 kgf/cm2 (7 ± 1.4 psi) 2) Suction set pressure : 0.05 ± 0.01 kgf/cm2 (0.7 ± 0.14 psi) Preventing excessive pressure inside the tank When the hydraulic actuators are operated, the oil level in the hydraulic system increases as temperature rises. If the hydraulic pressure rises exceeding the set pressure, the breather is actuated to release the hydraulic pressure inside the tank.
  • 18. Figure 4 Air breather 1 Body 3 Cap 2 Filter 4 Valve Hydraulic tank pressurizing The hydraulic tank is pressurized to create a positive pressure at the hydraulic pump inlet to prevent cavitation. If the tank cap assembly does not function or seal properly, the hydraulic pump could be damaged. To pressurize the tank, raise the boom to maximum height, extend the arm and bucket cylinders, then lower the boom to the ground. To prevent hydraulic oil ejection due to the tank internal pressure while hydraulic system maintenance, press the inner button several times to release the pressure until the air is all out.
  • 19. Service Information Document Title: Function Group: Information Type: Date: Hydraulic oil tank, vacuum- pumping, connecting and disconnecting pump Service Information 2014/12/22 Profile: EXC, EC160C L, EC210C L, EC180C L, EC240C L, EC290C L [GB] Hydraulic oil tank, vacuum-pumping, connecting and disconnecting pump Op nbr 911-040 14 360 000 Vacuum pump NOTICE Connection of the vacuum pump must be performed with the diesel engine off. The air filter is placed above the filtered hydraulic oil. Therefore, carefully clean the surfaces closest to the filter. Do not leave the connection to the filter open for longer than it takes to fit the adapter. NOTE! There is always a risk of air entering the hydraulic system when using a vacuum pump. NOTE! See : 9111 Breather, replacing 1. Place the vacuum pump on the hydraulic oil tank. Figure 1 Remove air breather 2. Remove screws (1) and air breather (2) from hydraulic oil tank (3). 3. Install adapter (2) and connect hose (1) to the adapter.
  • 20. Figure 2 Connection of vacuum pump 1. 2. 3. Hose Adapter Vacuum pump 4. Connect the plug to the 24 V socket behind the operator's cab. 5. Start the vacuum pump. 6. Run the pump for 2–3 minutes until a negative pressure reading of –30 kPa (–4.35 psi) is obtained. 7. Adjust the vacuum pressure with the adjusting knob so that oil leakage will not occur during work on the hydraulic system. Figure 3 Vacuum pump 1. Adjusting knob IMPORTANT! The pressure must not fall below –30 kPa (–4.35 psi), as otherwise there is a risk of damage to the hydraulic oil tank. 8. Turn off the electric power to the vacuum pump. 9. Remove the plug from the 24V socket. 10. Remove the hose from the adapter. 11. Remove the adapter and immediately fit the air breather.
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