PUMP GP-PISTON 2518032 - Caterpillar

8W-3589 Spring Link Assembly
The 8W-3589 Spring Link Assembly may have been assembled with internal springs that are not correct. If the spring link assembly was not assembled correctly, it will take excessive effort, up to 178 N (40 lb) of force, to move the longest exposed end when pushing on it. A link assembly that was assembled correctly needs approximately 89.0 N to 97.9 N (20.0 to 22.0 lb) of force to begin moving the rod.
The 8W-3589 Spring Link Assembly can be checked by pushing in on the longest exposed rod with a suitable scale. Observe the amount of force when the rod begins too move.
If the link assembly takes excessive effort to move the rod, replace it with a new 8W-3589 Spring Link Assembly. Make sure the new one is tested before installation.
8W-0328 Damper Cylinder
The same governor control linkage for the foot accelerator may become "slow" or hard to move. The throttle pedal may also be slow when returning to the low idle position. This problem may be caused by the 8W-0328 Damper Cylinder.
The function of the 8W-0328 Damper Cylinder is to dampen the rapid return action of the governor linkage to low idle when the depressed accelerator pedal is released. If fluid leaks out of the 8W-0328 Damper Cylinder, the accelerator pedal may begin to drag causing the throttle linkage to become slow in allowing the engine to return to low idle, replace the 8W-0328 Damper Cylinder.