Steering Control Valve, Hydrostatic Steering; Remove; Install; Disassemble - Taylor-Dunn TC-030-60L Operation, Maintenance, And Replacement Parts Manual

Maintenance, Service, and Repair

STEERING CONTROL VALVE, HYDROSTATIC STEERING

Hydraulic fluid and components must be kept clean. Thoroughly clean exterior of any hydraulic component
before disconnecting hoses or fittings. Perform all maintenance and repairs in a clean environment. Do not
use cloth or paper towels to clean components due to possible contamination with lint or other fiber. Failure
to follow these guidelines will result in premature failure of hydraulic system components.

Remove

1. Make sure the ignition switch is in the "OFF"
position.
2. Place the transmission shift lever in the Park or
Neutral position
3. Set the park brake.
4. Place blocks under the rear wheels to prevent
vehicle movement.
6. Remove the dash assembly.
7. Remove the steering wheel.
8. Disconnect the horn switch wires from the column.
9. Remove the hydraulic hoses from the steering valve body.
Tie the hoses so that the ends of the hose remain above
the level of the reservoir to prevent fluid from draining
out.
10. Remove the four bolts holding the steering valve assembly
to the tilt bracket.
11. Remove the valve assembly from the vehicle.

Install

Instal the valve in reverse order of removal.
Tighten mounting bolts to torque listed in the Hardware Torque
table at the end of this section.
Reconnect the battery, remove the blocks from behind the
wheels and test drive the vehicle.
The hydraulic system does not have to be bled. To expel any
air in the system, power up the pump and turn the steering
wheel fully in both directions.

Disassemble

Refer to exploded illustration later in this procedure.
1. Remove the steering column assembly (32) from the
Steering Valve.
2. Clamp the Steering Valve as
shown in a vise. use protective
material such as leather on the
vise jaws. Do not over tighten the
vise or the housing may be
damaged.
Steering Components
Page 2
3. Remove the cap screws and end cap (2).
4. Remove the seal (3) from the end cap.
5. Remove the Gerotor (4).
6. Remove the seal (3) from the Gerotor.
7. Remove the drive spacer (5).
8. Remove the drive (7).
9. Remove the spacer plate (6).
10. Remove the seal (3) from the housing.
11. Remove Steering Valve from the vice.
12. Remove the upper retaining ring (19).
13. Place the assembly on the bench with the ports facing up.
14. Rotate the spool and sleeve assembly (9) until the
centering pin (10) is horizontal then push spool and sleeve
assembly just far enough to free the gland bushing (18)
from the housing and remove the bushing.
15. Remove the quad seal (17) from the seal gland bushing.
16. Carefully remove the dust seal (16) from the gland
bushing.
17. Remove the two bearing races and the thrust bearing (13,
14) from the spool/sleeve assembly.
18. While slowly rotating the spool/sleeve assembly, carefully
remove it through the back of the housing. It should come
out easily without forcing.
19. Remove the pin (10) from the spool/sleeve assembly.
20. Push the spool out just far enough so that the springs (11)
clear the slot in the sleeve and remove the springs.
21. While rotating the spool, Push it back through the sleeve
to remove it.
22. Remove the seal (15) from the housing.
23. Thread a 10-24 machine screw into the check valve ball
seat (23). Pull the screw with a pair of pliers to remove the
seat.
24. Remove the two seals from the seat.
25. Remove the check ball and retainer (21,22).
Model B4XT-2500