CG958H Wheel Loader. Manual - part 35

-  - 

142

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”. 

9.9 Maintenance of Each 2000 Working Hours or Every Year 

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

manual’s safety chapter shall be read and understood. 

z  Firstly carry on the aforementioned examination items 

z  Firstly, carry on the aforementioned items. 

Oil in hydraulic tank 

Replace oil. 

Let the machine work for longer hours to heat the oil. 

The machine shall be on level ground, set all working devices in the ground and exert 

downward pressure on them. Close the parking brake and shutdown the engine. 

1．Disassemble the oil filling cap of the hydraulic tank. 

2. Open the vent valve at the bottom of the hydraulic tank and discharge the oil. 

3. Close the vent valve. 

4. Replace the filter of hydraulic system. See “Hydraulic System” in “Maintenance of Each 500 

Working Hours or Every Season”. 

5. Disassemble the fuel strainer, clean it and install it. 

6. Refuel to the hydraulic tank. See “Viscosity and Full Capacity of Oil”. 

7. Check the gasket of the oil filling cap and replace the damaged gasket. 

8. Fit on the oil filling cap. 

9. Start the engine and run it for a few minutes. 

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

through the oil filling port. 

-  - 

143

11. Shut down the engine. 

Differential gear and final transmission 

Replace oil. 

1. Disassemble the oil drain plug of front axle and rear axle, and discharge the oil. 

2. Clean the oil drain plug and reinstall it. 

3. Disassemble the oil drain plug of front axle and rear axle, refuel the axle through the oil 

filling port till bleeding. See figures and tables in “Viscosity and Full Capacity of Oil”. 

4. Install the oil drain plug. Start the engine and let it work for a few minutes. Re-check the oil 

level and refuel to the specified position if necessary. 

5. Install the oil drain plug. 

Service brake system 

Check the preliminary filling pressure of nitrogen gas of the accumulator. 

 

Please connect with the appointed maintenance service of the SICHUAN CHENGDU 

CHENGGONG CONSTRUCTION MACHINERY CO.，LTD. to check the preliminary filling 

pressure of nitrogen gas of the accumulator for you. 

 

Caution 

Whether the preliminary filling pressure of nitrogen gas of the accumulator is too 

high or too low will reduce the service life of the accumulator, affect the braking 

performance, and danger the traffic safety by a lot of leakage. 

Check wear-out of wet brake disc. 

1.    Disassemble the plug screw to check wear-out of front axle brake disc. 

-  - 

144

2.  Disassemble the plug screw to check wear-out of rear axle brake disc. 

 

3.  Measure the depth of the hollow form oil scupper on both sides of the brake disc, and gain 

the remaining time of the brake disc by compared with the following table. 

 

Percentage of estimated 

remaining life of 

braking disc to the 

service life of 

braking disc

 

Thickness 

of braking 

disc mm

 

Depth of scupper 

mm

 

100 9.2 

1.24 

80 8.9 

1.09 

60 8.62 

0.95 

40 8.32 

0.8 

20 8.03 

0.655 

0 7.74 

0.51 

4.  Fit on the plug screw. 

If necessary to replace the braking disc, please connect with the dealers of the SICHUAN 

CHENGDU CHENGGONG CONSTRUCTION MACHINERY CO., LTD.

 

9.10 Maintenance of Each 2000 Working Hours or Every Year 

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

manual safety chapter shall be read and understood. 
z  Firstly carry on the aforementioned examination items 

z  Firstly, carry on the aforementioned items. 

Coolant in the cooling system 

Replace the coolant / clean the system. 

Caution

 

Do not replace coolant before reading and understanding the content of the chapter 

“cooling system specification”. 

Replace the coolant as soon as possible when observing the coolant has impurities or 

-  - 

145

bubble. 

The radiator cap locates at the top of the rear cover of the machine. 

1.  Open the maintenance gate of the radiator. 

2.  Slowly loosen the radiator cap and release the pressure. 

3.  Open the discharge valve and discharge the coolant. The discharge valve locates at the 

bottom of the radiator. 

4.  Close the discharge valve and add system clean water and cleaning liquid of the cooling 

system which concentration is 6%~10%. 

5.  Start the engine and run it for 1.5 hours, shutdown it and discharge cleaning liquid. 

6.  Shut down the engine and wash the cooling system with clean water till removes all water. 

7.  Close the discharge valve. 

8.  Add coolant. See also in “cooling system specification” and “Viscosity and Full Capacity 

of Oil”. 

9.  Start and run the engine, open the radiator cap, open the thermostat, stable the liquid level. 

10.  The coolant level shall keep within 1cm under the charging pipe. 

11.  Replace damaged lid gasket and fit on the lid. 

12.  Shut down the engine.