LG936L Wheel Loader. Manual - part 28

Operation & Maintenance Manual──LG936L Wheel Loader 

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3. CONTENT OF MAINTENANCE 

3.1 Every 10 Hours (Days) Service 

z  Check the sealing performance of work equipment systems such as hydraulic, steering and brake 

system. 

z  Check the flexibility and reliability of the brakes. 

z  Check whether the electric circuit is correct and the electric components are normal. 

z  Check the oil level in the oil tank and the water level in the water tank. 

z  Add grease to the fan shaft, jointed point between front and rear frames, driving axles, jointed 

points of oscillating frame and joint points of work equipment. 

z  Check if there are other abnormalities. 

z  Refer to Operation and Maintenance Manual of diesel engine for maintenance. 

 

3.2 Every 50 Hours (Week) Service 

Carry out the periodic maintenance of every 10 hours with this maintenance operation at the same 

time. 

z  Check oil level of the gearbox, hydraulic oil tank and brake booster pump. 
z  Tighten all connection bolts of transmission axles. 
z  Check whether all connection bolts of hubs and the brake caliper are loosen. 
z  Check all connection bolts of teeth for tightening. 
z  Check and lubricate the accelerator control, parking brake and gearshift control system. 

In addition, do the extra maintenance in the first 50 hours as follows: 

z  Check and clean the air vent of the gearbox. Check and clean the filter cartridge of the oil line 

system of the torque converter-gearbox. 

z  Check if there is leakage in the hydraulic system. Check and clean the air vent of the hydraulic 

reservoir. Check the oil-return filter cartridge of the hydraulic reservoir. 

z  Check if there is leakage in the brake system. Clean the filter mesh of the oil bowl in the booster 

pump. Clean the air vent and check the brake fluid. Add them if deficient. 

3.3 Every 250 Hours (Month) Service 

Carry out the periodic maintenance of every 10 and 50 hours with this maintenance operation at the 

same time. 

z  Check the storage battery. Clean surface and terminals of the battery then coat Vaseline lamina. 

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z  Check whether assembling bolts of frames are loose and welding seams are cracked. 

z  Check whether the front and rear axles, engine and gearbox and frame are loosen.   

z  Check the tire pressure. Inflation pressure of front tires should be (0.333～0.353)MPa while that 

of rear tires should be (0.275～0.294)MPa. 

z  Open the water draining valve in the air tank to drain the water out. 

In addition, do the extra maintenance in the first 250 hours as follows: 

z  Check and clean the air vent of gearbox. Clean the oil pan of gearbox. Replace the suction filter 

cartridge in the oil pan of gearbox. Replace the filter cartridge in the oil lines of torque 

converter-gearbox. Replace the gearbox oil. 

z  Replace the gear oil in the front and rear axles. 

z  Check if there is leakage in the brake system. Clean the filter mesh of the oil bowl in the booster 

pump. Clean the air vent and check the brake fluid. Add them if deficient and replace them if 

necessary. 

3.4 Every 500 Hours (Season) Service 

Carry out the periodic maintenance of every 10, 50 and 250 hours with this maintenance operation at 

the same time. 
z  Check and adjust the clearance of hand brake system. 
z  Check the wear condition of brake discs and friction discs. Replace them if necessary. 
z  Clean the silencer of the braking electromagnetic valve. 

In addition, do the extra maintenance in the first 500 hours as follows: 

z  Check if there is leakage in the hydraulic system. Check and clean the air vent of hydraulic 

reservoir. Replace the oil-return filter cartridge and pilot filter (if assembled) of hydraulic 

reservoir. Check the quantity and cleanness of hydraulic oil. Filter the oil if possible. Add them if 

deficient and replace them if necessary. 

z  Check if there is leakage in the brake system. Clean the filter mesh of the oil bowl in the booster 

pump. Clean the air vent and replace the brake fluid. 

3.5 Every 1000 Hours (Half a Year) Service 

Carry out the periodic maintenance of every 10, 50, 250 and 500 hours with this maintenance 

operation at the same time. 

z  Clean the oil pan of gearbox. Clean the air vent of gearbox. Replace the suction filter cartridge in 

the oil pan of gearbox. Replace the filter cartridge in the oil lines of torque converter-gearbox. 

Replace the gearbox oil. 

z  Change the gear oil in the front and rear axles. 

Operation & Maintenance Manual──LG936L Wheel Loader 

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z  Check and clean the filter mesh of the oil bowl in the booster pump. Clean the air vent and 

replace the brake fluid. 

z  Check if there is leakage in the hydraulic system. Check and clean the air vent of hydraulic 

reservoir. Clean the hydraulic reservoir. Replace the filter cartridge of oil-return filter and pilot 

filter (if assembled).   

z  Check the clearance and wear condition of the pins and the bushes in every articulated point. 

In addition, do the extra maintenance in the first 1000 hours as follows: 

z  Replace the hydraulic oil. And then replace once every 2000 hours. 

3.6 Every 2000 Hours (Year) Service 

Carry out the periodic maintenance of every 10, 50, 250, 500 and 1000 hours with this maintenance 

operation at the same time. 

z  Check performance of the torque converter and gearbox, differentials of front and rear axles and 

the wheel side reducers. Disassemble them for checking if necessary. 

z  Check the sealing performance of multi passage valve and hydraulic tank by measuring the 

natural sedimentation volume of the cylinders fuel oil, and then check the system pressure. If the 

natural sedimentation volume is over than its specified value, replace the multi passage valve or 

hydraulic tank. Contact us for details. 

z  Check the welded seams of rim and other stress parts and adjust the deformation. 

3.7 Alteration   

The maintenance principles listed above are the normal requirements. The maintenance time should 

be determined by the closer one between the two the maintenance schedules. If the working condition 

is very severe, please shorten the maintenance cycle and increase the maintenance times according to 

the real conditions. 

3.8 Replace the Air-Storage Tank after 3 Years of Service 

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CHAPTER V THE STRUCTURE AND 

PRICIPLE OF MAIN COMPONENTS 

AND SYSTEM   

 

1 Transmission System 

The transmission system includes the hydraulic torque converter, gear box, transmission shaft, front 

and rear driving axle, wheel and others. The transmission system diagram is shown in the Figure 5-1. 

 

Figure 5-1 Principle Diagram of Transmission System 

 

2 Hydraulic System 

As shown in Figure 5-2, the mechanical manual control hydraulic system is composed of a work 

pump, multi-way valve, lift arm cylinder, bucket cylinder, steering pump, load sensing hydraulic 

redirector, priority valve, steering cylinder, hydraulic pressure oil tank and pipe attachments. DF25 

multi-way valve includes bucket unit and lift-arm unit. The bucket unit includes dumping, neutral and 

receiving bucket in three positions. The lift-arms unit controls four actions including floating, 

lowering, neutral and lifting to utilize the work control of loader working device.   

As shown in Figure 5-3,5-4, the hydraulic system employs pilot operation and work pump, multi-way