CG938H Wheel Loader. Manual - part 30

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lubricant has smoke and dust, sulfide, oxide and nitride and measure their amount. The 

infrared analysis may help us work out the replacement cycle of the lubricant under special 

working conditions. 

The infrared analysis method shall be conducted simultaneously with the wear element 

analysis method and chemical and physical tests so as to ensure the correct evaluation. 

S.O.S Cyclogram 

Oil box 

Engine oil 

Hydraulic 

oil 

Differential  

/Final drive oil 

Transmiss

ion fluid 

Time interval  250h 

500h 

500h 

500h 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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IX  

Maintenance Interval 

9.1 Upon Request 

Prior to carrying out any operation and maintenance, the warnings and annotations in 

this manual’s safety chapter shall be read and understood. 

Please refer to the instructions for use and maintenance of the engine for cleaning of air 

intake system. 

Repairing of filtering element 

Caution 

In repairing of air filter, the engine shall be turned 

off to avoid damage.   

Please repair the air filter according to the instructions 

for use and maintenance of fuel engine. The following 

steps are for reference only.   

Replace/clean coarse filtering element 

1． Dismantle the cover of air filter (1); 

2． Dismantle coarse filtering element (2) from the shell of 

the air filter; 

3． Clean the shell of the air filter; 

4． Clean and examine the coarse filtering element. Please see “Cleaning of Coarse Filtering 

Element”; 

5． Installed the cleaned coarse filtering element in the shell of the air filter; 

6． Clean and install the cover, and fasten the bolts on the cover with hands not a tool. 

After installing a cleanly coarse filter, if the engine discharges black smoke, new fine 

filter shall be installed. 

After being cleaned for 6 times, the coarse filtering element shall be replaced. Even if it 

is not cleaned for 6 times, it shall be replaced one time every year.   

Replace fine coarse filtering element 

Caution 

After each cleaning of fine filtering element, do not try to reuse it after cleaning. 

After the coarse filtering element is repaired for three times, the fine one shall be 

replaced. 

1

2

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After installing a cleanly coarse filter, if the engine discharges black smoke, new 

fine filter shall be installed. 

1． Open the maintenance door; 

2． Dismantle the cover and coarse filtering element; 

3． Dismantle the bolt fixing the fine coarse filtering element and then dismantle the fine 

filtering element; 

4． Cover the air inlet and clean the interior of the air filter; 

5． Examine the gasket between air inlet pipe and shell. Any damaged gasket shall be 

replaced; 

6． Open air inlet to install a new fine filtering element; 

7． Install the nut and gasket on the screw. The torsional moment of the nut shall be 

27±7N.m; 

8． Install the coarse filtering element and cover, and fasten the bolts on the cover with hands 

not a tool; 

9． Close the maintenance door. 

Clean coarse filtering element 

While cleaning the coarse filtering element, do not strike it, or not, the engine will 

be damaged. 

The filtering element may be cleaned with pressure air, pressure water or cleaning. 

1． Induct the air or water along with internal and external wrinkles of the filtering element; 

2． After cleaning, examine the coarse filtering element. Do not 

use the filtering element with a damaged wrinkle, gasket or 

seal; 

3． Pack the cleaned filtering element and store it at a cleanly 

and dry place. 

Accumulator

 

The accumulator of this loader is free from maintenance, 

which is located at the right side of the rear end of the rear 

frame.。 

  All fixed bolts of the accumulator shall be fastened per 1000 

 125

hours. 

Radiator

 

Clean or replace the pressure cover 

The maintenance door of the radiator cover is designed at the rear topside of the machine. 

1． Open the maintenance gate of the radiator. 

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

3． Examine the damage, precipitation or foreign substance of the cover, and wipe off the 

cover with a cleanly cloth or if necessary replace it with a new one; 

4． Fit on the cover; 

Close the maintenance door. 

Clean the exterior of radiator core 

Open the radiator cowling at the back of the 

machine. 

The dust, leafs and other foreign substance on 

the radiator may be removed with compressed air, 

high-pressure water or steam (compressed air is 

better).  

Fuse

 

Location: Fuse box is installed at the right lower side of the instrument desk in the cab. 

Fuse--It protects the electrical system from damage due to short circuit. If the fuse link is 

burnt out, a new one of same specification shall be used; if the fuse link is burnt out again, the 

circuit shall be examined and repaired. 

z  Only the fuse of fusing current can be used, 

or not, the circuit will be damaged possibly. 

If the fuse requires to be replaced frequently, 

it is possible the circuit is involved in failure. 

Please examine the circuit. 

Windscreen wiper and washer pump 

Examination/replacement of the wiper 

Examine the brush of the wiper. If it is worn