PUMP-LUBRICATION 3720501 - Caterpillar

Sudden movement or accidental starting of the machine can cause personal injury or death to persons on or near the machine.To prevent personal injury or death, perform the following:Park the machine on a smooth, level surface.Lower the work tool to the ground and engage the parking brake.Stop the engine and remove the key.Block the wheels and install the steering frame lock.
Personal injury or death can result from sudden movement of the lift or tilt cylinders.Sudden movement up or down, can cause the clearance above your head to change rapidly.Do not stand under the lift arms when testing and adjusting the lift cylinders.Do not stand under the bucket when testing or adjusting the tilt cylinder.
This procedure is used to verify a problem with lift cylinder drift and tilt cylinder drift.Note: For all drift tests, the bucket must be empty.Lift Cylinder
Ensure that the machine is in an open area so that the bucket can be fully raised.
Move the transmission direction control to the NEUTRAL position.
Start the engine and warm the hydraulic oil to 65 3°C (150 5°F).
Move the lift cylinders up and down for five repetitions. This will help to ensure that there is warm oil in the lift cylinders.
Raise the bucket until the lift cylinders are fully extended. Move the lift control lever to the HOLD position.Note: The engine may be running or shut down for this test. If you stop the engine, leave the engine start switch key in the OFF position.
Measure the amount of rod movement.
Table 1
Oil Temperature     Maximum Drift     Time (Minutes)    
38 3°C ((100 5°F))     13.0 mm
(0.51 in)     5    
49 3°C
(120 5°F)     13.0 mm
(0.51 in)     2.7    
66 3°C
(150 5°F)     13.0 mm
(0.51 in)     1.7    
Slowly lower the bucket to the ground when the test is finished.If the lift cylinder does drift, one of the following problems may exist:
Worn lift cylinders
Damaged ride control diverter valve
Damaged main control valveTilt Cylinder
Ensure that the machine is in an open area so that the bucket can be fully raised.
Start the engine and warm the hydraulic oil to 65 3°C (150 5°F).
Raise the bucket until the tilt cylinder is parallel to the ground. Move the lift control lever to the HOLD position.
Actuate the tilt cylinder in and out for five repetitions. This will help ensure that there is warm oil in the tilt cylinder.
Position the bucket so that the bottom of the bucket is parallel to the ground. Move the tilt control lever to the HOLD position. Note: The engine may be running or shut down for this test. If you stop the engine, leave the engine start switch key in the OFF position.
Measure the amount of rod movement.
Table 2
Oil Temperature     Maximum Drift     Time (Minutes)    
38 3°C ((100 5°F))     19.0 mm
(0.75 in)     5    
49 3°C
(120