HARNESS AS-MONITOR 2903234 - Caterpillar

Daily
Visually inspect the front and rear suspension cylinders for leaking oil. If leaking oil is present, remove the cylinder and repair the leak. Repair the cylinder or replace the cylinder as soon as possible.
Illustration 1 g01219112
Suspension cylinder (1) Relief valve (2) Plug (3) FittingVisually inspect the front and rear suspension cylinders for any unusual conditions that might affect the operation of the cylinder or the ride of the truck. The following conditions can affect performance:
collapsed cylinder
excessive rod extension
damage to the chrome on the cylinder rodGrease that is forced into the cavity that is inside of the cylinder at Location (A) will limit the travel of the cylinder rod. If the travel of the cylinder rod is limited, the ride of the truck can become rough. If reduced travel of the cylinder rod is found, repair the cylinder or replace the cylinder as soon as possible.Note: Do not attempt to remove the relief valves (1), plug (2), or fitting (3) when there is pressure in the cylinder.Every 500 Service Hours or 3 months
Note: All of the suspension cylinders that are shipped from the factory receive a preliminary charge of nitrogen and a preliminary charge of oil. During field assembly, the suspension cylinders must be charged with nitrogen.
Check the suspension cylinders when the dump body is empty.
Stop the machine gradually on a level surface without using the brakes.
Prepare the machine for maintenance. Refer to Operation and Maintenance Manual, "Prepare the Machine for Maintenance".
Illustration 2 g01583894
Front Suspension Cylinder (X) Distance of exposed finished surface
Measure the distance of exposed finished surface (X) for the front suspension cylinders. Compare the present distance to the distance from the previous time. If those dimensions are not available, check the charge pressure.Note: There are two relief valves for the grease on the forward side of the front suspension cylinder. These relief valves are located 180 degrees from the lubrication fitting. Do not plug the grease passage of the relief valves.
If necessary, perform the charging procedure on the front suspension cylinders.
Illustration 3 g01964614
Rear Suspension Cylinder (Y) Distance of exposed finished surface
Measure the distance of exposed finished surface (Y) for the front suspension cylinders. Compare the present distance to the distance from the previous time. If those dimensions are not available, check the charge pressure.
If necessary, perform the charging procedure on the rear suspension cylinders.Refer to Special Instruction, SEHS9411, "Servicing the Suspension Cylinders for Off-Highway Trucks" for any information concerning suspension cylinders. The Special Instruction includes tooling, pressures, and the correct procedures for purging (oil and nitrogen) and charging (oil and nitrogen), that are used on all off-highway truck suspension cylinders.Every Year
Purge the nitrogen charge from the suspension cylinders. Refer to the procedure to purge suspension cylinders in Special Instruction, SEHS9411.Replace the relief valves on the front suspension cylinder and make sure that all the grease ports are clear. Recharge the suspension cylinders with nitrogen charge. Refer to the procedure to recharge the suspension cylinders in Special Instruction, SEHS9411.