769D Off-Highway Truck/Tractor and 771D Quarry Truck Caterpillar


Suspension Cylinder - Check

Usage:

769D BBB
Make sure that the dump body is empty.

Stop the machine gradually on a level surface without using the brakes.

Engage the parking brake and stop the engine.

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.

Front Suspension Cylinder

------ WARNING! ------

Personal injury or death can occur if personnel are trapped between the wheel and the frame.

The steering system is hydraulically controlled and wheels can crush personnel during movement.

Use caution when working between the wheels and the frame. If the wheels must be turned, ensure that all personnel are clear of the machine before any movement.




Illustration 1g00794781

Measure the distance of the exposed chrome on the suspension cylinders. Compare the present distance to the previous distance. If you do not have the previous dimensions, perform the charging procedure. See Testing And Adjusting, "Suspension Cylinder (Front) - Purge and Charge" for the charging procedure. Record the dimensions for future reference.

Note: If the present distance is NOT equal to the previous distance, perform the charging procedure or the purge procedure so the two dimensions are equal. See Testing And Adjusting, "Suspension Cylinder (Front) - Purge and Charge" for the charging procedure.

Note: There is a relief valve on the forward side of the front suspension cylinder. This relief valve is located 180 degrees from the lubrication fitting. Do not plug the grease passage of the relief valve.

Rear Suspension Cylinder



Illustration 2g00524586

Measure the distance of the exposed chrome on the suspension cylinders. Compare the present distance to the previous distance. If you do not have the previous dimensions, perform the charging procedure. See Testing And Adjusting, "Suspension Cylinder (Rear) - Purge and Charge" for the charging procedure. Record the dimensions for future reference.

Note: If the present distance is NOT equal to the previous distance, perform the charging procedure or the purge procedure so the two dimensions are equal. See Testing And Adjusting, "Suspension Cylinder (Rear) - Purge and Charge" for the charging procedure.

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