PIN AS. 2614549 - 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.
Table 1
Required Tools    
Part Number     Description     Qty    
6V-9512     Face Seal Plug     2    
5K-9090     O-Ring Seal     2    
6V-9833     Cap     2    
6V-9508     Face Seal Plug     1    
6V-8397     O-Ring Seal     1    
6V-9829     Cap     1    The ride control valve can be the cause of excessive lift cylinder drift. This procedure will isolate the ride control valve in the hydraulic system. Disconnect all lines to the ride control valve before you perform the drift test for the lift cylinders.
Move the steering frame lock to the locked position.
Lower the bucket to the ground.
Release the pressure in the implement hydraulic system and in the ride control system. Do not start the engine. Turn the engine start switch key to the ON position and move the ride control switch to the ON position. Move the hydraulic control levers to all positions in order to release the pressure in the hydraulic system. Place the lift control lever in the FLOAT position. Place the tilt control lever in the HOLD position.
Turn the engine start switch key to the OFF position.
Push down on the plunger on the hydraulic tank breaker relief valve until all pressure is released.
The hydraulic pressure must be released before the following tasks may be performed:
Loosening components
Tightening components
Removing components
Adjusting components
Illustration 1 g00299358
Loader Tower (1) Diverter valve to tank (2) Accumulator into diverter valve (3) Pilot signal to tank (4) Ride control diverter valve
Remove hose assemblies (1) and (2) .
Install a 6V-9512 Face Seal Plug in the ends of hose assemblies (1) and (2) . Install a 5K-9090 O-Ring Seal and a 6V-9833 Cap on the two elbows.
Remove tube assembly (3) from the ride control valve (4) .
Install a 6V-9508 Face Seal Plug in the end of the tube assembly (3) . Install a 6V-8397 O-Ring Seal and a 6V-9829 Cap on the elbow.
Start the engine and raise the bucket to the maximum height.
Place the lift control lever in the HOLD position and stop the engine.
Measure the distance of rod movement in 1 minute. For a new lift cylinder, the maximum rod movement in 1 minute is 3.0 mm (.12 inch).
If isolating the ride control valve eliminated the drift problem, inspect the ride control valve. Check for scoring in the main valve stem and in the valve body. Check for O-rings that are worn or damaged on the solenoid valve.
When the testing is complete, repeat Steps 2 through 6. Remove the plugs, the seals, and the caps. Connect tube assembly (3) and the hose assemblies (1) and (2) .