CG935G Wheel Loader. Manual - part 26

- 105 - 

the bucket and exert downward pressure on it slightly. Close the parking brake and shutdown 

the engine. 

1. Remove oil drain plug in gearbox to discharge oil remained. 

2. Replace filtering element. Refer to “Gearbox Oil” in Maintenance after 50-Hour Running-in 

of New Loaders. 

3. Dismount oil suction pipe and drain pan assembly from box body, and dismount support plate 

assembly from the drain pan assembly. 

4. Take off magnet on the support plate assembly and clean it with a clean stiff brush or 

compressed air. 

5. Clean oil suction pipe, support plate assembly and drain pan. Replace the support plate 

assembly if filter screen is damaged. 

6. Reinstall the magnet onto support plate assembly. 

7. Reinstall the support plate assembly onto drain pan. Check the gasket and replace it if 

damaged. 

8. Reinstall drain pan assembly, tighten screws and then install oil suction pipe. 

9. Clean and install oil drain plug into gearbox. 

10. Add oil to gearbox through the filler. Refer to Viscosity and Filling Limit of Working Oils. 

11. Replace the air release valve on the top of gearbox with a new one. 

12. Start engine and apply brake. 

13. Slowly operate gearbox control lever with the engine idling to circulate oil. Place gearbox 

control lever on neutral position. 

14. Keep the oil at specified level, and add oil through filler if necessary. 

15. Shut down engine. 

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. 

- 106 - 

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

 

 Firstly carry on the aforementioned examination 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. 

11. Shut down the engine. 

Differential gear and final transmission 

Replace oil. 

- 107 - 

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. 

Engine Valve Clearance 

Adjustment 

Adjustment should be carried out in accordance with service manual of diesel engine. The 

following procedure is for reference only. 

 To avoid personal injury and death, rotating flywheel by staring engine is not allowed. 

Engine component with high temperature may cause scald, therefore the engine must 

be cooled down before measuring valve clearance. 

 Shut down the engine to measure valve clearance. To obtain precise measurements, 

shut down the engine for 20 minutes to achieve same temperature at cylinder head 

and cylinder body. 

Adjust valve clearance to be within the scope specified in service manual of diesel engine. 

Please contact service staff for complete adjustment procedure of valve clearance. 

Engine Valve Rotors 

Observe the rotation of the rotors with the engine idling after valve clearance is adjusted. 

WARNING 

Always wear goggles or face shield and protective clothing to avoid scald by hot oil. 

1. Start engine and run it at a low rpm. 

2. Observe the top surface of each valve rotor, which should rotate slightly each time the valve 

closes. 

Contact service staff if any rotor fails to rotate.

 

9.10 Maintenance of Each 3000 Working Hours or Every Year

 

 Firstly carry on the aforementioned examination items 

Coolant in the cooling system 

- 108 - 

Replace the coolant / clean the system. 

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

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.