CG938H Wheel Loader. Manual - part 21

 

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be operated after being cooled. 

Use the wet soft cloth wringed out to wipe off the display surface. If necessary, soft cleaning agent 

may be used; strong solvent such as thinner and gasoline are prohibited in order to avoid the 

damage of the machine. Prior to cleaning, the power shall be shut off. Do not use any liquid or 

spray cleanser. The hole on the rear cover is designed for purpose of ventilation. Blockage or 

covering of the vent is strictly prohibited. 

Do not open the housing for repairing without authorization in order to avoid electric shock or other 

damages. For some problems, please ask the professional to solve them. 

 

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Operation 

I  Operation and Control of Loader 

1.1 Start Key Switch 

 

Turn on the power switch firstly, and then turn the key switch to start the engine. 

1． The key switch has four positions:            

 

 

 

 

 

 

 

 

 

 

 

 

Notes: 

z  The running time for starting the engine each time shall not exceed 5 seconds. For the second 

starting, the interval time of two times shall be over 2 minutes. 

z  After starting and preheating of the engine, if the alarm lamp lights (including low brake 

pressure alarm lamp, or engine failure, and fuel-water alarm lamp), the engine shall be 

stopped immediately for examination. After the alarm lamp lights off, the engine may be 

operated, or not, your driving safety would be endangered. 

z  After starting and preheating of the engine, if the low brake pressure alarm lamp lights 

continuously, the engine shall be stopped immediately for examination. After the alarm lamp 

Flameout: The key switch may be inserted or pulled out only 
at this position. As the switch is situated at this position, 
the power source of most circuits of the cab will be shut off.

Pre-heating: Turn the key switch anticlockwise to this 

position to put through preheating device.

 

Powerup: Turn the key switch clockwise to this position for the power 

connection of electronic monitor and instruments in the cab etc. When the 

switch key is rotated to this position, the engine will automatically examine 

whether it is preheated. If any, the engine’s electric control system will open 

Starting: Turn the key switch clockwise to this position to start 
the engine. After starting, release the key switch, the key switch 
will automatically return to the power-up position. 

 

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lights off, the engine may be operated, or not, your driving safety would be endangered. In 

case the brake pressure alarm lamp lights during the period of drive, it shall be stopped 

immediately for examination. 

1.2 Transmission Control, Steering Gear and Horn Switch 

Transmission control 

 

 

 

 

Option of driving directions-- Pull forwards the operating rod (1) for advance, and backwards for 

retrogression 

Speed option--Turn the speed operating rod (1). As the arrowhead aims at 1.2.3 and 4, the 

corresponding driving speed may be attained. 

z  This loader has four forward gears and three backward gears. As the speed operating rod is at the 

position of 4 gear, the loader is under the state of retrogression, and only three-gear speed may be 

attained. 

  (2) KD key (1) is designed at the topside of the speed operating rod with the purpose to 

improve the operation efficiency. Its application technology is given below: 

1． As the loader advances to and near the stockpile at the speed of II gear, press the KD key (1) 

for maximum tractive force. 

2． As the speed operating rod is turned to the reverse direction upon the completion of loading 

work, the loader will back to II gear automatically (reverse and advance are II gear) for the 

relatively high speed to finish the loading work; 

3． Repeat steps 1~2 to use the KD key for a higher operation efficiency. 

Turning operation 

The driving direction of this loader is controlled by steering wheel (2). The turning of the 

steering wheel means the turning of the loader. 

Turn left--Turn the steering wheel (2) anticlockwise, the loader turns left. Faster turning of the 

steering wheel anticlockwise, quicker turning left. 

1

2

2

3

 

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Turn right-- Turn the steering wheel anticlockwise, the loader turns right. Faster turning of the 

steering wheel anticlockwise, quicker turning right. 

Horn switch (3)--Press the horn switch (3), the horn will alarm. 

1.3 Control of Parking Brake 

The parking brake is an integral with the 

emergency brake system. Both are controlled 

hydraulically. The parking button (1) is designed 

on the instrument desk. 

Caution 

The medium of this system is hydraulic oil 

same as the other hydraulic systems, so other 

brake liquid is not required. 

This system carries out the international standard ISO 3450-1999. 

Caution 

Only the parking brake oil pressure is over 10.3MPa, the parking brake may be loosened. 

Therefore, when the loader is running and the oil pressure is less than 10.3Mpa, the parking brake 

will automatically damp. Therefore, the driver shall watch out the parking brake alarm lamp. 

Running the loader under the state that the parking brake is closed is not allowed. 

Do not use the parking brake while driving under exceptional circumstances, or not, the 

parking brake will be damaged seriously.   

Close parking brake--Press the parking button (1) to close the parking brake. 

Loosen parking brake--turn clockwise the parking button (1), the handle will bounce 

automatically to loosen the parking brake. 

Warning 

After starting and preheating of the engine, if the low brake pressure alarm lamp lights 

continuously, the engine shall be stopped immediately for examination. After the alarm lamp 

lights off, the engine may be operated, or not, your driving safety would be endangered. In case 

the brake pressure alarm lamp lights during the period of drive, it shall be stopped immediately 

for examination. 

Caution 

Welding and mechanical processing on the shell of the accumulator are not allowed. Upon the 

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