CG958H Wheel Loader. Manual - part 34

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Check the cleanliness of the oil and replace it if it is dirty. 

See the steps in “‘Front axle and rear axle’ in the maintenance of 50 hours running-in of 

new loader”. 

Working device and hydraulic steering system 

Check the cleanliness of the oil and replace it if it is dirty. 

To see the steps in “‘Working device and hydraulic steering system’ in the maintenance of 

the running-in 50 hours of new loader”. 

9.7 Maintenance of Each 500 Working Hours or Every Season 

z  Firstly carry on the aforementioned examination items 

z  Firstly carry on the aforementioned items. 

Before carrying out any operation or maintenance, the warnings and annotations in this 

manual’s safety chapter shall be read and understood. 

 

Crankcase scavenging valve of engine 

Clean scavenging valve 

Carry on cleanup according to the service manual of diesel engine. 

Hydraulic system 

Replace filter. 

1.  Disassemble the oil filling cap, and release the pressure inside the gasoline tank. 

2.  Loosen the fixed bolts of the filters. 

3.  Disassemble the lid and filter element. 

4.  Discard the filter element. 

5.  Check the O-Ring and it shall be replaced if necessary. 

6.  Install new filter element and lid, and tighten the fixed bolts of the lid. 

7.  Maintain the hydraulic oil level in the middle of the oil gauge, and if necessary, refuel it 

through the oil filling port. 

8.  Check the seal of the lid of oil filling port, replace the gasket if it is damaged, and install 

the lid of oil filling port. 

Fuel oil system 

Clean and replace the filter. 

Caution 

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Before the installation of filter, do not refuel. Impure fuel oil will cause the 

accelerated wear of the fuel oil system. 

 

Clean the coarse filter element. 

Carry on working according to the service manual of diesel engine and the following steps 

are for reference only. 

1.  Open the maintenance door by the side of the machine. 

2.  Loosen the holding bolt on the shell of the filter. 

3.  Discard the shell and filter. 

4.  Disassemble the filter element from the lag. 

5.  Clean the filter element and shell in clean, non-flammable solvent. 

6.  Dry the filter element by compressed air. 

7.  Clean the shell base of the filter. 

8.  Check the seal ring and replace it if it is damaged. 

9.  Install clean filter element. 

10.  Encase the filtering element and lag. 

11.  Re-tighten the bolts. 

 

Replace the thin fuel oil filter 

Carry on working according to the service manual of diesel engine and the following steps 

are for reference only. 

1.  Disassemble the filter and discard it as useless. 

2.  Clean the filter fixing base, and make sure that all the old seal rings have removed. 

3.  Smear clean diesel on the new filter seal ring. 

4.  Install new filter by hand and twist another three-quarters circle when the seal touch the 

base. 

5.  Start the diesel engine system (see below). 

Start the fuel system. 

If the engine fails to start or run smoothly after refueling the filter and oil pump body, the 

injection pump and pressure duct shall be started with refueling. 

Each injection pump has an overflow one-way valve, which can not be opened by manual 

pump pressure. Refuel the injection pump and pipeline according to the following steps. 

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z  If loosen or tighten fuel line nut by only a wrench, the fuel injector may be 

irremediable defect by distortion. So clamp the injector by a wrench and loosen the 

nut by another wrench. 

1.  Loosen spray bar at the engine junk head. 

2.  Set the acceleration control leer to low speed idle position. 

3.  Start the engine and stop it till the diesel flow out from all pipelines and no air bubbles. 

4.  Tighten the nut of fuel oil pipe with a torsional moment of 40±7N.m, and chuck the injector 

with another wrench to prevent damage. 

5.  Start the diesel and check its leakage. 

6.  Close the maintenance door. 

Start pump 

Filter and pump body 

1.  Open the engine fuel system vent valve. 

2.  Loosen the priming pump plunger and press it up and down. 

3.  Close the pump and lock plunger when there is no bubble as the fuel oil flows out. 

4.  Close the vent valve. 

5.  Start the diesel and check its leakage. 

Additional Maintenance Contents for the First 600 Hours after the Usage of 

New Loader Are Given Below 

Differential gear and final transmission 

Replace oil. 

See oil replacement in “Front axle and rear axle’ in the maintenance of 50 hours running-in 

of new loader”. 

Working device and hydraulic steering system 

Replace oil. 

See the steps in “‘Working device and hydraulic steering system’ in the maintenance of the 

running-in 50 hours of new loader”. 

9.8 Maintenance of Each 1000 Working Hours or Every Half An Year 

Before carrying out any operation or maintenance, the warnings and annotations in this 

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manual’s safety chapter shall be read and understood. 

z  Firstly carry on the aforementioned examination items 

z  Firstly, carry on the aforementioned items. 

Gearbox oil 

Replace the gearbox oil. 

Start the engine to hear the oil and the machine shall be set at a level position. Set down 

the bucket and exert downward pressure on it slightly. 

Close the parking brake and shutdown the engine. 

1.Disassemble the oil drain plug at the bottom shell of the gearbox to discharge the oil, 

clean and fit on the oil plug. 

2. Disassemble the oil drain plug which locates below the torque-converter’s oil 

radiator at the backmost of the machine and discharge the oil. Clean and fit on the oil 

plug. 

4.  Replace filter. 

5.  Fill up oil with special volume into the torque-converter and fill to the high 

position of the oil gauge when the machine is offstate. 

6.  Start engine and pedal the service brake. 

7.  Under the idle speed, slowly manipulate the joystick of the gearbox, and recycle 

the oil so that oil torque-converter and pipeline may be full of oil. Check the oil 

level of the torque-converter which shall between the low and high level of the oil 

gauge. 

8.  Set the joystick of gearbox at stop short, shutdown the engine and park it well. 

Specific see “Instructions of 4WG200 Power Shift Gearbox”. 

Gimbal of driving shaft 

1.  Fill lithium-based lubricant into the grease fitting of the gimbal of middle shaft.   

2.  Fill lithium-based lubricant into the grease fitting of the gimbal of forward shaft. 

3.  Fill lithium-based lubricant into the grease fitting of the gimbal of fork of rear driving shaft. 

4.  Fill lithium-based lubricant into the grease fitting of the gimbal of rear driving shaft. 

Additional Maintenance Contents for the First 1500 Hours after Usage of 

New Loader Are Given below.