CYLINDER AS 4T1580 - Caterpillar

Disassembly Procedure
Start By:
Remove the prelubrication oil pump. Refer to Disassembly and Assembly, "Prelubrication Oil Pump - Remove".
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Illustration 1 g00546236
Air Driven Prelube Pump
Mark the position of air driven motor (1) or the electric motor on prelubrication oil pump (2). Remove the bolts that hold prelubrication oil pump (2) to air driven motor (1) or the electric motor.
Remove air driven motor (1) or the electric motor from prelubrication oil pump (2). The key in the motor shaft and the input shaft of the prelubrication oil pump may cause resistance during the separation.
Illustration 2 g00546237
Mark the position of head (3) on housing (4). Remove head (3), gaskets, and shims. Save the shims.
Illustration 3 g00546241
Remove idler (5). Inspect the bearing in the idler. The inside diameter of the bearing must be 19.126 mm (0.7530 inch).
Illustration 4 g00546242
Remove rotor (6). Inspect the outside diameter and the inside diameter for wear. The outside diameter of the rotor must be 85.509 to 85.547 mm (3.3665 to 3.3680 inch).
Illustration 5 g00546244
Remove lip seals (7).
Inspect all of the parts. Replace any of the parts that are worn or damaged.
Ensure that the socket head screw is in place in the discharge port.