CG938H Wheel Loader. Manual - part 35

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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 wear-out of front axle brake disc and check the plug screw. 

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

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 etimated 

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. 

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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 

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. 

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Machinery Management 

I    Management and Usage of New Machine 

New machine leave factory after sophisticated inspection and test run. However, it shall 

have enough running-in before usage, which is the know-how of long-term maintaining 

machine in a well-state and economic usage. 

Please take heed of the following items when using new machine: 

z  No matter what season, enough warming-up shall be done before working. 

z  Be sure to avoid the engine work in idling (non-load high-speed operation). It must not do 

like that especially not heating the engine. 

z  Be sure to avoid emergency brake, flashback and unnecessary spike stop. 

z  Inspection and maintenance shall be implemented by provisions. 

II  Storage of the Machine 

The ambient temperature of storage is -15℃-40 . If beyond this temperature range, it is 

℃

suggested to store indoor. The relative humidity shall not exceed 70%.

 

2.1 No Use for One Month 

In addition to the attention of stop at ordinary time, the following items shall be 

implemented for the machine of non-use of a month: 

z  Brake the machine for every week, and operate the working device to use at any time. 

2.2 No Use for over One Month 

In addition to the attention of stop at ordinary time, the following items shall be 

implemented for the machine of non-use of over a month: 

z  Check oil point of each part to see whether it has oil with specified volume. 

z  Park at hard-surface road at high position taking into account such as the rainy season. 

z  Take out the accumulator. 

Even parking inside the house, the accumulator shall be kept in other dry place for the 

summer heat or humid area, and be charged for every month. 

z  Smear the anti-corrosive grease on the bare part of easily rusty hardware such as piston 

rod. 

z  Cover with clothes at the humidity area (venting device, air filter). 

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z  Tyre pressure shall be adjusted to the standard pressure and check the abrasion and 

damage of tyre. (Prepare new tyre according to the check result). 

In order to remove the burden of tyre load, float it by jacking up the machine. 

If this approach can not be implemented, be sure to check the air pressure every two 

weeks to maintain proper air pressure. 

z  Carry on running the machine for every week, start the engine, move the machine forward 

after enough warming-up. 

If the working device is moved, the antirust grease on the piston rod shall be wiped away 

firstly. 

2.3 Use after Long-term Storage 

z  Remove the cover which prevents humidity. 

z  Wipe the anti-corrosive grease which covers the bare part. 

z  Discharge the oil in the engine crankcase, torque-converter gearbox, differential gear and 

final reducer, clean them, and replace new oil with specified volume. 

z  Discharge impurity and water from hydraulic reservoir and diesel box. 

z  Add cooling water with specified volume. 

z  Install the removed storage accumulator after it has been charged and connect it with 

cable. 

z  Adjust the tyre pressure according to the authorized pressure of the road. 

z  Carry on the inspection before operating. 
Carry on the warm up operation.