SEAL, PISTON N.S.S. - Caterpillar

When performing this adjustment, put the hydraulic controls lockout lever in the LOCKED position and stop the engine.
Improperly adjusted bucket clearance could cause galling on the contact surfaces of the bucket and stick, resulting in excessive noise and/or damaged O-ring seals.
Note: To access the areas required to perform this procedure, a portable access system (ladder, stair assembly, man lift, or other portable access system) that is suitable and compliant to local regulations may be necessary.The lateral clearance of the bucket control linkage on this machine can be adjusted by shimming four different pins. If the gap between the bucket and the stick becomes excessive, adjust the clearance to 0.5 to 1 mm (0.02 to 0.04 inch). If the gap between the power link and the idler link becomes excessive, adjust the clearance to 0.5 to 1 mm (0.02 to 0.04 inch). If the gap between the idler link and the stick becomes excessive, adjust the clearance to 0.5 to 1 mm (0.02 to 0.04 inch). If the gap between the bucket cylinder and the stick becomes excessive, adjust the clearance to a maximum of 1 mm (0.04 inch).
Illustration 1 g00880867
Position the machine on a level surface and lower the bucket to the ground.
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Slowly operate the swing control lever until the bucket cylinder and the stick are in full face contact at location (1).
Place the hydraulic lockout control (lever) in the LOCKED position and stop the engine.
Measure the clearance at location (2). If the clearance is greater than 1 mm (0.04 inch), install more shims at location (1) to reduce the clearance to a maximum of 1 mm (0.04 inch). Refer to Disassembly and Assembly, "Bucket Cylinder - Remove" and Disassembly and Assembly, "Bucket Cylinder - Install" to remove the pin for the bucket cylinder.
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