Instruction Manual

60
Caterpillar: Non-Confidential
position. Engage parking brake and mount
the lock pin of frame. Start the engine and
run it for 10 minutes at idle speed.
Repeatedly raise the boom, lower the
boom, dump and rack back bucket etc.
2. Finally, raise the boom to the highest
position and pull the bucket to the furthest
back position. Stop the engine.
3. Push the bucket control knob of
working valve forward. Dump the bucket
under the gravity effect and drain the fluid
of tilt cylinder. When the bucket is tilted at
the required position, push the boom
control lever of working valve forward.
Lower the boom under gravity effect and
drain the oil of boom cylinder.
4. Clean the drain port under the
hydraulic tank. Unscrew the drain plug;
drain the hydraulic oil into a container. At
the same time, unscrew the filler cap and
quicken the drain process.
5. Remove the inlet pipe of hydraulic oil
tank and drain the hydraulic oil left in the oil
tank.
6. Remove the hydraulic return filter
element from the hydraulic tank and
replace it with a new filter element. Open
the filler cap and take off the filling screen
to wash it.
7. Remove the cleaning flange disc of the
tank under the filling port. Use diesel to
wash the bottom of hydraulic oil tank and
its four sides and dry it with a clean cloth.
8. Mount the drain plug of hydraulic tank,
return filter, cover, filling screen, tank
cleaning flange port and the inlet pipe.
9. Fill the clean hydraulic oil from the
filling port of hydraulic tank to allow the oil
level reach the upper scale of hydraulic
level gauge. Screw on the filler cap.
10. Remove the lock pin of frame and start
the engine. Operate the working valve
control lever. Raise and lower the boom,
dump and rack back the bucket, and steer
left and right at the largest possible angle
twice or three times to make the hydraulic
oil fill the cylinder and lines. Then, run the
engine for 5 minutes at the idle speed to
vent the air from the system.
11. Stop the engine and open the filler
cover of hydraulic tank. Add the clean
hydraulic oil to 2/3 scale of hydraulic tank
level gauge.
Replace Heavily Polluted Hydraulic Oil
If the operating condition is bad or the
hydraulic oil is seriously polluted, such as
being black, or foamy. Please immediately
replace the hydraulic oil.
1. Clean the dirt from the bucket. Park
the machine on a flat field and put the
transmission control lever in the neutral
position. Pull the parking brake lever and
mount the lock pin of the frame. Start the
engine and run it for 10 minutes at the idle
speed. Repeatedly raise and lower the
boom, dump and rack back the bucket etc.
2. Finally, raise the boom to the highest
position and backward the bucket to the
largest position. Stop the engine.
3. Push forward the bucket control knob.
Dump the bucket under the gravity effect
and drain the fluid of the tilt cylinder. When
the bucket is tilted at the required position,
push the boom control lever forward.
Lower the boom under gravity effect and
drain the oil of boom cylinder.
4. Clean the drain port under the
hydraulic tank. Unscrew the drain plug;
drain the hydraulic oil into a container. At
the same time, unscrew the filler cap and
quicken the drain process.
5. Remove one end of all pipes to drain
the remained fluid of steering cylinder,
hydraulic oil cooler and pipes.
6. After draining the oil, mount the drain
port plug under the hydraulic tank and all
pipes removed.
7. Open the filler cap of hydraulic tank
and fill the clean hydraulic fluid to the lower
mark of level gauge.
8. Replace the oil again according to the
‘Replace the Hydraulic Oil’ section
mentioned above. And replace the return
filter element. Clean filling screen and
hydraulic tank.