HUB 9J0105 - Caterpillar

Be sure the engine has been shutoff for a minimum of five minutes to be sure that accumulator oil pressure is zero. Accumulator is filled with dry nitrogen. Do not loosen or remove valve or cap from the top of accumulator. A bleed screw at the bottom of the accumulator can be used to release any pressure that is left in the system. Failure to follow the procedures can result in personal injury.
1. Disconnect hose assembly (1) from accumulator. 2. Install tooling (A) and a hoist on the accumulator. Remove six bolts (3) that fasten the accumulator to the frame. Remove accumulator (2). The weight of the accumulator is 70 kg (155 lb.).Install Accumulator
1. Install tooling (A) and a hoist on accumulator (1) and put it in position. 2. Install bracket (3) and six bolts (2). Remove tooling (A). 3. Connect hose assembly (4) to the accumulator.
If accumulator needs to be charged, be sure to use dry nitrogen only. Charging accumulator with oxygen gas will cause an explosion. For charging procedures see TESTING AND CHARGING THE ACCUMULATOR in TESTING AND ADJUSTING in the 615 WHEEL TRACTOR AXLE SUSPENSION SENR2506.
Disassemble Accumulator
START BY:a) remove accumulator 1. Release the nitrogen gas pressure from the accumulator. Turn valve assembly (3) slowly to release the nitrogen.2. Disconnect tube assembly (1) from the manifold.3. Remove manifold (2). Check the condition of the O-ring seal behind the manifold. If the seal has damage, use new parts for replacement. 4. Remove bolts (4), cover assembly (5) and the tube assembly as a unit. 5. Remove bolts (6) and head (7) from the accumulator assembly. 6. Remove seals (8) from the head. Check the condition of the seals. If the seals have damage, use new parts for replacement. 7. Remove piston (9) from the accumulator with tooling (A). 8. Remove seal assemblies (10) from the piston.Assemble Accumulator
1. Make sure the inside of the accumulator is clean and free of dirt and foreign material.2. Install seal assemblies (1) in the piston as shown. 3. Put piston (2) in position in the accumulator as shown. Make sure threaded hole in the piston is toward the head end of the accumulator.4. Fasten tooling (A) to the piston and push the piston to the bottom of the accumulator. 5. Install seals (3) on the head assembly. Install the backup ring next to the flange of the head and the O-ring seal away from the flange.6. Install two 7/8"-9 NC guide pins in the accumulator as shown. Put clean hydraulic oil on seals (3) and put head assembly (4) in position in the accumulator. 7. Install bolts (5) that hold the head assembly in position. Tighten the bolts to a torque of 949 34 N m (700 25 lb.ft.). 8. Put cover assembly (6) and the tube in position on the accumulator and install bolts (7). 9. Install manifold (8) on the accumulator. Connect tube (9) to the manifold.END BY:a) install accumulator