SEAL AS 8T6923 - Caterpillar

Recondition the actuators for the fuel control, the wastegate, and the air choke. The main components of each actuator include the housing, a piston assembly, and a solenoid which actuates the piston. The piston assembly and the solenoid can be serviced separately.Note: New parts or remanufactured parts may be used for reconditioning the actuators.
During operation, the linkage of the electrohydraulic actuators can form pinch points which can cause personal injury. Shut down the engine before you service the electrohydraulic actuators.
Illustration 1 g00833592
(1) Receptacle for the wiring harness
(2) Guards
Disconnect the wiring harness from receptacle (1). Inspect the connectors for damage and corrosion. Make repairs, if necessary.
Remove guards (2).
Disconnect the supply line (not shown) and the return line (not shown) for the hydraulic oil.
Illustration 2 g00833594
(3) Rod end
(4) Clevis
(5) Boot
(6) Nut
Disconnect rod end (3) from clevis (4).
Remove clevis (4) and rubber boot (5). Inspect the boot for damage. If the boot is damaged, obtain a new boot for assembly. Note: Handle the actuator carefully. Use care not to damage the actuator's shaft. Damage to the shaft can result in premature failure of the O-ring seal. This will cause hydraulic fluid to leak.
Remove nut (6) in order to remove the actuator from the bracket. Note: Do not allow debris to enter the actuator. Seal the openings with clean covers immediately after the solenoid and/or the piston assembly is removed.
Illustration 3 g00833595
(7) Housing
(8) Piston assembly
(9) O-ring seal
(10) Bolt
(11) Solenoid
(12) O-ring seal Note: The spring in the housing will be loose after the piston assembly is removed.
Place housing (7) in a vise. Remove piston assembly (8). Remove O-ring seal (9) from the joint between the piston assembly and the housing. Note: O-ring seal (9) is included with the piston assembly.
Install a new O-ring seal (9) and piston assembly (8). Make sure that the spring in the housing is properly aligned in the bore of the piston. Tighten the piston assembly according to the engine's Specifications.
Remove bolts (10) in order to remove solenoid (11). Remove O-ring seal (12) from the joint between the solenoid and the housing.
Install a new O-ring seal (12) and solenoid (11). Install bolts (10). Tighten the bolts according to the engine's Specifications.
Install the actuator in the bracket with nut (6).
Install boot (5). Make sure that the outer end of the boot folds inward when the actuator's shaft moves from the fully open position to the fully closed position.
Install clevis (4). Connect rod end (3) to the clevis.
Install guards (2).
Connect the supply line and the return line for the hydraulic oil.
Connect the wiring harness to receptacle (1).