Steering Gear Valve, Cleaning, Inspection and Repair

TM 10-3930-630-34

b. Inspect all moving parts to make sure they have

not been scored or damaged by dirt particles. Smooth

burnished surfaces are normal in many areas. Any

slightly scored parts may be cleaned by hand rubbing

with 600-grit abrasive paper.

c. Prepare all surfaces of control assembly for

assembly as follows:

(1) Place a piece of 600-grit abrasive paper

face up on a piece of plate glass or similar material.

(2) Clean the ends of the star gear first to

remove any sharp grit from the paper which could

produce scratches.

(3) Clean both sides of the ring gear, both

sides of the plate, the 14-hole end of the housing, and

the flat side of the end cap.

(4) Stroke each surface across the abrasive

several times and check the results. Any small bright

Figure 8-4. Checking control spool.

areas indicates a burr which must be removed. When

polishing the parts, hold them as flat as possible against

(5) Control assembly.

the abrasive. After 6 to 10

(a) Remove bushing (26) and packing (27)

from control assembly.

CAUTION

Use extreme care when removing

control spool and sleeve. The parts

are closely fitted and must be rotated

slightly as they are withdrawn.

(b) Place port face of housing (38) on a solid

surface and remove the control spool and sleeve from

housing (38).

CAUTION

Do not pry against edge of hole in

housing bore when removing valve

seal plug.

(c) Using a small bent tool or wire, remove

valve seal plug (28) from housing by reaching it through

"out" port and pushing upwards.

See figure 8-5.

Remove packing (29, fig. 8-3).

(d) With housing (38) in vise, control end up,

unscrew check seat (30), using a hex wrench.

(e) Remove housing from vise and tip up.

Figure 8-5. Removing check valve seat plug.

Tap housing lightly with palm of hand and allow check

valve seat (30), ball (31) and spring (32) to fall out into

strokes across the abrasive, check the part to see if it is

other hand.

polished. After each part is polished, rinse clean in

(f) Remove disks (33) and centering pin (34)

solvent, blow dry with air, and place it where it can

from the control spool and sleeve.

remain absolutely clean until assembly.

(g) Push inside lower edge of spool (35) so

d. Replace all packing and oil seals. Replace all

spool moves toward splined end and remove spool

other parts as authorized.

carefully from sleeve (36).

(h) Push centering spring set (37) out of spring

8-10.

Steering

Gear

Valve,

Reassembly

and

slot in spool (35).

Installation

8-9. Steering Gear Valve, Cleaning, Inspection and

a. Control Assembly, Reassembly

Repair

(1) Install clean wooden block in a vise to

a. Clean all parts with cleaning solvent (Fed. Spec.

P-D-680). Cleaning may be done during disassembly

and parts set to dry on clean paper towel.

8-6