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CG958H Wheel Loader. Manual - part 33

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Air conditioning System

1. For the integral air conditioning system, do not dismantle it randomly so as to prevent the

condensator from leakage. Examine it regularly; especially examine whether the pipe joints

are loosened and whether the collecting screws are loosened. For any problem, the

corresponding measures shall be taken.

2. Regularly examine the belt for proper tightness. Usually, after working for 100 hours, it

shall be examined one time. Please see the “Regulation of Belt” in the chapter of “Air

Conditioning” for details.

3. Regularly clean the dust on the surface of condenser. It may be cleaned with water or

high-pressure air blower to prevent weakening the condensation effect. Usually, after

working for 100 hours, it shall be cleaned one time. Spray rinsing with steam is not

allowed.

4. While removing the system refrigerant, discharge it slowly to avoid randomly discharging

of the antifreezing oil. Keep it away from skin.

5. While replacing the parts, add the antifreezing oil according to the requirements.

6. The expansion valve has been adjusted well according to the relevant regulations. Do not

adjust it without authorization.

9.6 Maintenance of Each 250 Working Hours or Every Month

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

manual’s safety chapter shall be read and understood.

z Firstly carry on the aforementioned examination items

Engine oil and filter

Replace engine oil and filter

1. Disassemble the oil drain plug of crankcase, discharge oil, clean the plug and install it.

2. Open the machine’s left maintenance door, disassemble the filter with a zonary wrench.

3. Clean the filter’s shell base, remove all old filter gaskets.

4. Smear new filter gasket with a thin layer of engine lubricant.

5. Install new filter by hand, tighten it for semi-circle when the gasket touch the base.

6. Disassemble the oil filling cap, and add fresh oil into the crankcase. See also “Viscosity and

Full Capacity of Operation Oil”. Clean the oil filling cap and install it.

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7. Start the engine to heat oil, detect leakage, and shutdown the engine.

8. Maintain the engine oil in the normal position of oil gauge.

9. Install the maintenance door.

Braking system

Test the braking capacity of the service brake.

There shall not have any people and obstacles around the machine.

Fixed link of the front and rear frames shall be packed up.

Test the brake on dry road.

The following tests are used to determine whether the service brake functions are normal

or not, not to measure the maximum braking force. The vehicle braking force needed by the

engine running at a certain speed is adapted with the setting value of the engine and the

efficiency of the driving system, as well as the braking capacity of the brake.

When the machine begins moving, the revolving speed of the engine when braking, the

service brake shall be compared with that of the engine as braking stopper is under the original

test, and shall be a system wear symbol.

1． Start the engine, slightly raise the bucket, brake the service brake, and release the parking

brake.

2． When braking the service brake, put forward the gearshift at the second gear.

3． Gradually increase the revolving speed of the engine to high speed idle, and the machine

shall not move.

Warning

When the machine begins moving, immediately reduce the revolving speed and close

up the parking brake.

4． Let the revolving speed of the engine drop to low speed idle, set the gearshift to stop short,

close up the parking brake, put the bucket on the ground, and shutdown the engine.

Caution

If the machine still moves when tasting the service brake, please connect with

related service station and allow serviceman to check the machine. If necessary, the service

brake shall be repaired before reuse of the machine.

Test the braking capacity of the parking brake.

There shall not have any people and obstacles around the machine.

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There shall not have any people and obstacles around the machine.

Fixed link of the front and rear frames shall be packed up.

Carry on the test on dry cement road which slant angle is about 8 degree and the length of

the slope is about 20 meters.

The following tests are used to determine whether the service brake functions are normal

or not, not to measure the maximum braking force.

1. Start the engine, and raise the bucket to the transport position (40 centimeters above the

ground).

2. Drive the machine to the center of the slope, tramp the service braking pedal to stop the

machine (do not loosen the pedal at this time).

3. Set the gearshift to the stop short and close up the parking brake.

4. Loosen the service braking pedal (shall not turn off the engine), observe whether the

machine moves down or not. At this point in time, if the machine doesn’t move in five

minutes, the parking brake is normal.

Warning

If the machine moves, immediately tramp the service braking pedal to stop the

machine and quickly drive it off the slope.

Caution

If the machine still moves when testing the parking brake, please connect with

related service station and allow serviceman to check the machine. If necessary, the

parking brake shall be repaired or adjusted before re-use the machine.

Cooling system

Add coolant additive.

Caution

Do not add additive randomly before reading and understanding the content of the

chapter “Cooling System Specification”.

The maintenance door of the radiator cap is located on the top of the aft closure of the

machine.

1. Open the maintenance gate.

2. Slowly unscrew the radiator cap and release pressure.

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3. Add 0.25L coolant.

4. Fit on the radiator cap and close the maintenance gate.

Splines of propeller shaft

Lubricant splines

1. Disassemble the fixed link of the front and rear frames and start the engine.

2. Turn the machine right or left to the limit position.

3. Put the bucket on the ground, close up the parking brake, and shutdown the engine.

4. Lubricate the hinged splines of propeller shaft.

Air-conditioning

Service test - adjusting belt

1. Start the engine and allow it run at high speed idle.

2. Set the temperature knob of the air-conditioning at the largest refrigeration position

(anticlockwise at full) and the switch of air volume at high position.

3. Wait two minutes for the stability of the air-conditioning system.

4. Check the refrigerants of the system by the following methods: touch the low-voltage tube

and high-voltage tube by hand. If there has any refrigerant in the system, the high-voltage

tube shall be hotter than the low-voltage tube. If there has no refrigerant or few, the

air-conditioning system will stop working.

5. Shut down the engine and check the compressor belt.

6. Check the work and adjust the compressor belt. The belt shall lop to 14~20mm under a

power of 110 Newton.

7. Screw the adjustable nut till it gets the correct belt tension and tighten the nut to

150±20N.m.

8. Re-examine the regulation of the belt.

Repeat the 1~3 steps.

10. If the refrigeration is poor, shut down the air-conditioning and the engine. Connect with

the service station for the maintenance of the air-conditioning if necessary.

Additional Maintenance Contents for the First 200 Hours after Usage of New

Loader Are Given below

Front Axle and Rear Axle

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