CYLINDER HEAD GP 3935009 - Caterpillar

Drift Test for Lift Cylinders
Measure lift cylinder rod drift by using the following procedure:
Check hydraulic oil temperature.
Lift the bulldozer until the cutting edge is approximately 254 mm (10.0 inch) off the ground. With the lift control lever in the HOLD position, stop the engine.
Obtain a measurement of the distance of cylinder drift over time. Compare this distance to the values in the chart. Note: The drift distances in the chart are for new machines.
Table 1
Lift Cylinder Drift
Oil Temperature 38 to 49°C (100 to 120°F) 49 to 66°C (120 to 150°F) Over 66°C (Over 150°F)
Maximum Allowable Drift 32 mm (1.3 inch) 32 mm (1.3 inch) 32 mm (1.3 inch)
Time Interval (minutes) 5.0 2.7 1.7 Drift Test for Tilt Cylinder
Measure tilt cylinder rod drift by using the following procedure:
Check hydraulic oil temperature.
Fully retract the tilt cylinder.
Lower the bulldozer in order to lift the front idlers off the ground. Move the control levers to the HOLD position and stop the engine.
Obtain a measurement of the distance of cylinder drift over time. Compare this distance to the values in the chart. Note: The drift distances in the chart are for new machines.
Table 2
Tilt Cylinder Drift
Oil Temperature 38 to 49°C (100 to 120°F) 49 to 66°C (120 to 150°F) Over 66°C (Over 150°F)
Maximum Allowable Drift 13 mm (0.5 inch) 13 mm (0.5 inch) 13 mm (0.5 inch)
Time Interval (minutes) 5.0 2.7 1.7 Drift Test for Ripper Cylinder
Measure ripper cylinder rod drift by using the following procedure:
Check hydraulic oil temperature.
Lift the ripper so that the ripper teeth are approximately 254 mm (10.0 inch) off the ground. Move the ripper control lever to the HOLD position. Stop the engine.
Obtain a measurement of the distance of cylinder drift over time. Compare this distance to the values in the chart. Note: The drift distances in the chart are for new machines.
Table 3
Ripper Cylinder Drift
Oil Temperature 38 to 49°C (100 to 120°F) 49 to 66°C (120 to 150°F) Over 66°C (Over 150°F)
Maximum Allowable Drift 25 mm (1.0 inch) 25 mm (1.0 inch) 25 mm (1.0 inch)
Time Interval (minutes) 5.0 2.7 1.7 Speed Tests for Cylinders
The oil in the system must be the oil which is recommended in Operation and Maintenance Manual, and at a temperature of 65° 15°C (149° 27°F). All speed tests should be made with the engine speed at HIGH IDLE.Identify the speed of each cylinder. Compare these values to the values in the chart. Equal values indicate normal circuit operation.If the speed of a cylinder is too slow, check that circuit for cylinder drift.
Table 4
Speed Test of the Bulldozer Lift Cylinders Speed (seconds)
RAISE (ground level to full RAISE) 2.7 0.2
LOWER powerdown (full RAISE to ground level) 1.6 0.2
LOWER (pause time at ground level) 1.2 + 0.3 − 0.1
LOWER (full RAISE to full LOWER) 4.0 0.2
RAISE (full LOWER to full RAISE) 3.6 0.2
LOWER float down (full RAISE to ground level) 1.5 0.2
Table 5
Speed Test of the Bulldozer Tilt Cylinder(s) Speed (seconds)
TILT