BUSHING 4754440 - Caterpillar

2. Disconnect rod (3) that goes from the steering control valve to the steering gear.3. Put identification on the oil lines to the steering servo-receiver cylinder. Disconnect oil line (2) from the cylinder.4. Remove the bolts that hold the head end of the cylinder in place. Remove cotter pin and pin (1). 5. Disconnect oil lines (4) from steering servo-receiver cylinder (5). Remove cylinder (5).Install Steering Cylinder (Servo-Receiver)
1. Connect oil line (1) from the rod end of the servo-sender cylinder to the rod end of the servo-receiver cylinder.2. Connect oil line (2) from the head end of the servo-sender cylinder to the rod end of the servo-receiver cylinder.3. Put the cylinder in position and install the bolts that hold the head end of the cylinder in place. 4. Install pin (3) and the cotter pin.5. Connect oil line (5) to the cylinder from the pressure reducing valve.6. Connect rod (4) to the steering gear. Lift the front crankcase guard and install the bolts that hold it.7. Remove all air from the circuit for the servo cylinders. See "AIR IN FOLLOW-UP CIRCUIT" in 631D, 633D, 637D STEERING SYSTEM TESTING AND ADJUSTING.Disassemble Steering Cylinder (Servo-Receiver)
start by:a) remove steering cylinder (servo-receiver) 1. Remove cotter pin, pin (1), support (3) and the spacers from the head end of the cylinder.2. Remove oil line (4) and bolts (2) that hold the retainer and head on the cylinder. 3. Put the cylinder in a vise and pull rod (5) with retainer head and piston out of the cylinder. 4. Put the rod in a vise. Remove nut (7), piston (6), head (9) and retainer (8) from the rod.5. Remove the rings and seal assemblies from the piston. Remove the O-ring seal, back-up ring and seal from the head. Remove the wiper from the retainer. 6. Remove snap ring (10) and bearing (11) from the rod. 7. Remove head (12) from the tube of the cylinder. 8. Remove O-ring seal (13) and the back-up ring from the head. Remove snap ring (14) and the bearing from the head.Assemble Steering Cylinder (Servo-Receiver)
1. Use a piece of pipe (2) that is 4 in. (10.2 cm) long with a 1 1/4 in. (31.8 mm) outside diameter and 15/16 in. (23.8 mm) inside diameter to install the bearing in the head until it is against the bottom snap ring. Install the top snap ring that holds the bearing in place.2. Install back-up ring (1) on the head next to the flange and O-ring seal (3) as shown. Put clean oil on the O-ring seal and back-up ring. 3. Install head (4) in the tube of the cylinder. 4. Use pipe (2) to install the bearing in rod (5) until it is against the bottom snap ring. Install the top snap ring that holds the bearing in place. 5. Use tooling (A) to install wiper (6) in retainer (7) with the lip out as shown. Put clean oil on the wiper. 6. Use tooling (A) to install the seal in