SHIELD AS-HEAT 3080057 - Caterpillar

Sudden movement of the machine or release of air or oil under pressure can cause possible injury or death to persons on or near the machine.To prevent possible injury or death, do the procedure that follows before testing and adjusting the Hydraulic System.
When it is necessary to work under the machine with the body (bed) raised, attach the body (bed) retaining cables to the rear tow points. Install the rear tow point pins through the ends of the retaining cables.Failure to properly secure the body (bed) may result in personal injury or death.
Start the engine. Operate the engine at high idle.
Move the modular handle (hoist) to the RAISE position. Hold the modular handle (hoist) in the RAISE position for five seconds after the dump body is fully raised. Then, lower the dump body all the way to the truck frame.
Repeat Step 2 until the temperature of the hydraulic oil is above 38°C (100°F). Lift Time for the Hoist Cylinders
Lower the dump body to the truck frame.
Operate the engine at high idle.
Raise the dump body to the fully raised position. Use a stopwatch to measure the required time. The required time for full extension of the hoist cylinders is approximately 25 to 28 seconds. Refer to the Hydraulic System Testing and Adjusting, "Worksheets" for this machine in order to record the test results.Power Down Time for the Hoist Cylinders
Raise the dump body to the fully raised position.
Operate the engine at high idle.
Use the power down function to fully lower the dump body to the truck frame. Use a stopwatch to measure the required time. The time that is required to fully lower the hoist cylinders is approximately 18 to 23 seconds. Refer to the Hydraulic System Testing and Adjusting, "Worksheets" for this machine in order to record the test results.Perform Step 1 through Step 3 for the float down time of the hoist cylinders. Refer to the Hydraulic System Testing and Adjusting, "Worksheets" for this machine in order to record the test results.Cylinder Drift
Note: Perform this test with an empty dump body and hydraulic oil above 38°C (100°F).
Move the modular handle (hoist) to the RAISE position.
When the first stage of the hoist cylinders is extended by 305 mm (12 inch), move the modular handle (hoist) to the HOLD position.
The dump body will push the cylinder head of the first stage by 6.40 mm (0.25 inch) onto the second stage of the hoist cylinders. Use a stopwatch and record the required time. The acceptable time for cylinder drift is relative to the temperature of the hydraulic oil in the hoist cylinders. See the following table.
Table 1
Acceptable Cylinder Drift
Minutes Oil Temperature Cylinder Drift
12.4 38°C (100°F) 6.40 mm (0.25 inch)
9.6 43°C (110°F) 6.40 mm (0.25 inch)
7.8 49°C (120°F) 6.40 mm (0.25 inch)
6.4 54°C (130°F) 6.40 mm (0.25 inch)
5.3 60°C (140°F) 6.40 mm (0.25 inch)
4.4 66°C (150°F) 6.40 mm (0.25 inch)
3.8 71°C (160°F) 6.40 mm (0.25 inch)
3.2 77°C