Steering; Steering Control Valve; Remove; Install - Taylor-Dunn C0-T50-80 Service And Parts Manual

C0-T50-80

STEERING CONTROL VALVE

WARNING
This section is one section of a complete service
manual. Before starting any procedure, read all
warnings and instructions that are located in the
Service Guidelines chapter.

Remove

1: Remove the dash assembly.
2: Remove the steering wheel.
3: Disconnect the horn switch wires from the
column.
4: 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.
5: Remove the four bolts holding the steering valve
assembly to the tilt bracket.
6: 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.
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.
MC-T50E-02
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.

Reassemble

1: Thoroughly clean all components and air dry.
Read cleanliness caution at the beginning of this
section.
2: Use new seals. Lightly lubricate all seals with
petroleum jelly prior to assembly.
3: Lubricate the spool with hydraulic fluid and
assemble the spool and sleeve (9). Make sure
that the spring slots are at the same end. The
spool should freely rotate in the sleeve.
4: Position the springs (11) on the bench so that
extended edge is down and arched center section
is together.
5: Compress the extended end of the centering
spring set and push into the spool.
6: Center the spring set in the parts so that they
push down evenly and flush with the upper
surface of the spool and sleeve.
7: Install the pin (10) into the spool/sleeve assembly.
It should be flush at both ends.
8: Keeping the pin horizontal, install the spool/
sleeve assembly through the bottom of the
housing until it is flush with the bottom of the
housing.
9: Install the seal, races, and thrust bearing into the
top of the housing.
10: Install dust seal (16) into the seal gland bushing
(18). Flat or smooth side must face down into the
bushing.
11: Install the quad ring seal (17) into the gland
bushing. Smooth the seal into place with your
finger. Do not use any seal that freely falls into
pocket of the bushing.

Steering

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