PISTON GP 4374194 - Caterpillar

Personal injury or death can result from escaping fluid under pressure.Escaping fluid under pressure, even a very small pin-hole size leak, can penetrate body tissue and cause serious injury and possible death. If fluid is injected into your skin, it must be treated by a doctor familiar with this type of injury.Always use a board or cardboard when checking for a leak.
Specifications
Table 1
Boom Drift    
Distance    Time    
10 mm (0.4 inch)     5 minutes    Introduction
This information contains the following test:
Tilt Cylinder Drift - CheckRequired Tools
Table 2
Required Tools    
Part Number     Description    
5P-3277     Automatic Tape Measure    
-     Stopwatch    Test Preparation
Use the information in the reference to prepare the machine for this test.ReferenceFor the correct procedure to prepare the machine for this test, refer to Testing and Adjusting, "Machine Preparation for Troubleshooting" for the machine that is being serviced.Test Procedure
Position the machine on level ground.
The felling head must be empty.
Warm the hydraulic oil to normal operating temperature. Normal operating temperature is 50° C (122° F) to 60° C (140° F).
Run the engine at high idle. High idle speed for this machine is 2100 10 RPM.
Raise the boom until the pin for the tool tilt cylinder and the stick pin are the same height as the boom foot pin.
Fully retract the tool tilt cylinder.
Fully extend the stick cylinder.
Retract the stick cylinder rod 70 mm (2.8 inch) from the fully extended position.
Illustration 1 g01162747
Shift the hydraulic lockout control into the LOCKED position.
Shut off the engine.
Measure the length of the tool tilt cylinder from pin to pin. Record your measurement.
Leave the machine in this position for 5 minutes.
Measure the length of the tool tilt cylinder from pin to pin for cylinder drift. Compare this measurement with the measurement that was recorded earlier.
The maximum drift that is allowed for the tool tilt cylinder is shown in Table 1.