CG938H Wheel Loader. Manual - part 22

 

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completion of the connection, the hydraulic pipes shall completely discharge the air through screw 

plug on the accumulator. The repairing and pressure connection relating to the accumulator etc may 

be conducted after the oil pressure is released. 

1.4 Control Pedal 

Accelerator pedal (1)-- The accelerator is an electronic one. 

The journey under the pedal decides the oil supply amount 

of the diesel engine. 

Service braking pedal (2)-- In service, step on the pedal (2) 

to reduce speed or stop the loader. And after certain journey 

under the pedal, the power output of the transmission case 

may be shut off. 

1.5 Flameout Switch 

This loader adopts electric control. It is installed with the electric controlled flameout device, i.e. key 

switch on switch board. Turn off the key switch to flame out the engine. 

1.6 Control of Working Device 

Precautions: 

The hydraulic oil deployed by the hydraulic system must be cleanly. 

After the moving arm or rotary bucket is controlled to the wanted position, the pilot-operated 

control handle shall be back to the central position firstly.   

Do not lift the bucket to the highest position to deliver materials. In transportation, the interface 

point under the moving arm shall be kept for 500mm away from the ground so as to ensure the 

stable service of the loader. 

Prior to each service, the liquid level of the hydraulic oil box shall be examined to ensure the 

proper oil amount. 

The pilot-operated control handle shall be examined whether it stays at the central position. 

Examine whether the function of the lock-up solenoid valve of the handle (pilot-operated oil 

supply valve band) is normal. 

Operation: 

Usually, the operation way of the loader is joint operation with camion. If the 

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camion stops, the loader loads skidly. The camion and loader works jointly. 

Lifting Control of Bucket 

Descend and fluctuation--Push forwards joy stick (1) 

to lay down the bucket. If push it 

forwards further, the bucket 

fluctuation may be realized. 

Keeping--Move back the joy stick (1) to the central 

position from the lifting or decreasing, 

fluctuation position, and the bucket may 

stay at its original position.   

Lifting--Pull backwards joy stick (1) to lift the bucket. 

z  This loader is equipped with a lifting limit system. When the bucket is pulled backwards 

to lift the operating rod, the operating rod will be absorbed under the action of 

electromagnet to make the moving arm finish the lifting automatically until going up to 

the limit position. Meanwhile, the electromagnet will release the operating rod back the 

central position and stop the lifting of the moving arm. The different lifting elevations of 

the moving arm may be attained by adjusting the position of the electromagnet installed 

on the moving arm.   

Bucket Reversion Control 

Reversion--Pull outwards the joy stick (1) for bucket’s reversion forwards. 

Keeping--loosen the reversed joy stick (1) to make it back to the central position. The bucket will 

stay at its original position. 

Take back--Pull the joy stick (1) inwards to take back the bucket. 

z  This loader is equipped with a bucket auto-leveling device. After the bucket unloads, you 

may pull the bucket backwards to reverse the operating rod. The operating rod will be 

absorbed under the action of the electromagnet and finish bucket reversion 

automatically (the descent of the moving arm may be operated at the same time). As it 

reverses automatically to the bottom of the bucket and stays at the level position, it will 

automatically stop reversion. This process is named as the auto leveling. Its purpose is to 

improve the operation efficiency. The bucket bottom level or inclination the lifting 

elevations of the moving arm correspond to may be attained by adjusting the position of 

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the electromagnet installed on the cylinder of turn trolley to meet various working 

requirements. 

Loading: 

Advance to stockpile by II gear. When the loader reaches the near area of the stockpile, shift to 

I gear. Descend the moving arm to make the distance of the interface point under the moving arm   

away from the ground about 500mm.The bucket shall be parallel to the ground. 

As the bucket has a distance of about 1 meter away from the stockpile, the moving arm may be 

descended to make the bucket near the ground level and into the stockpile. 

As the bucket cuts into the stockpile amain, if the resistance is strong, the turn the bucket 

upwards and lift the moving arm discontinuously for full load. 

After the bucket is filled, lift the moving arm to certain elevation, and turn the handle back to 

the central position. 

Unloading: 

Load all or partial materials slowly by controlling reversion handle so as to weaken the impact 

force of the materials against the camion. If the materials are stuck on the bucket, the materials may 

be unloaded by means of reversing and shivering the bucket repeatedly. 

In order to prevent improper operation of the handle after parking and act of moving arm, the 

loader is equipped with a handle lock-up solenoid valve. The pilot-operated oilway shall be shut 

down firstly prior shutting off the power of the solenoid valve. At this time, if you operate the handle, 

the working device will not work. In working, power the solenoid valve. 

1.7 Housing rollover 

This machine adopts the integral rollover glass steel housing. 

In the left box of the counter weight, a housing rollover switch is 

available to realize housing rollover and enclosure. 

The rollover turns left to open the housing, vice versa. In the 

coursing of opening or enclosing the housing, if the housing fails 

to work, the switch shall not be pulled.

 

 

 

 

Hood Tilt 

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Prior to Starting Engine 

In-process Inspection 

Dismantle the front and rear frame fixed links and fix them on the rear frame. Prior to the 

dismantling of the frame fixed links, the loader cannot be started.   

For your safety and maximal service life, the 

in-process inspection shall be conducted prior to climbing 

up the loader and starting it. 

 Examine whether there exist screw loosening, 

garbage accumulation, oil or refrigerant leakage, damage or 

wear of parts at the surrounding or bottom of the loader. The 

working device and hydraulic components shall be examined. 

For the contents of daily in-process inspection, please refer to the “Maintenance per Ten Hours 

or Every Day” described in the chapter of “Maintenance”     

 

Examination Prior to Starting

 

Examine level of the hydraulic oil, engine oil, transmission fluid for torque converter, cooling 

fluid, and fuel etc. 

For the detailed maintenance contents, please refer to the “Maintenance per Ten Hours or 

Every Day” described in the chapter of “Maintenance”. 

Regulate the chair to facilitate the driver’s stepping on the pedal while leaning on the backrest.