RELIEF VALVE - TM-55-1740-200-140059

TM 55-1740-200-14

(1) The distance between the cam pivot and the

4-45. ADJUSTMENT. No adjustment is required for the

linkage hole is greater than the 7-1/4 inches.

relief valve.

(2) The link lever (36) is binding due to lack of

4-46. FLOW CONTROL VALVE.

lubricant or the lock nut (37) is too tight.

4-47. INSPECTION. See figure 4-11 and inspect the

(3) The valve (22) is sticking and should be

flow control valve as follows:

repaired.

a. Inspect spring (11) for breaks or distortion.

t. Repeat the procedure outlined in sub-paragraphs r

b. Inspect valve (10) for nicks, scores and excessive

and s and observe the left rear axle springs and the left

wear.

rear axle brake backing plate as the full turn position of

the rear steering system is reached. Any flexing of the

c. Inspect all threaded components for damaged or

rear axle springs or of the brake backing plate indicates

stripped threads.

that the rear wheels have reached a full turn position

prior to the automatic valve shut-off action explained in r

d. Inspect

all fluid passages in body (12) for

and s above. This will cause breakage and failure of rear

obstructions.

axle wheel parts, particularly the left rear wheel spindle.

4-48. CHECKOUT. Test operation of flow control valve

u. Another reaction which can often be observed when

in complete steering system, paragraph 4-35.

the automatic shut-off is not functioning properly is that

the front wheels will automatically attempt to steer

4-49. ADJUSTMENT. None required.

themselves (if the steering wheel is not held) due to the

hydraulic back pressure against the front steering valve.

4-50. FRONT DRAG LINK VALVE.

The above actions can be observed by steering the rear

wheels until the cam (35) is in position shown in detail E;

while holding in this position, insert a screwdriver tip

4-51. INSPECTION. See figure 4-9 and inspect the

between the roller (30) and the cam (35) causing a slight

front drag link valve as follows:

compression of the spring (25). Notice the severe reaction

on the rear wheel parts and the rear axle spring.

a. Inspect all pipe and threaded components for

stripped or damaged threads.

NOTE

b. Inspect springs (13, 22 and 46) for breaks or

Failure of the automatic shut-off to function

distortion.

can be caused by any of the items mentioned

in sub-paragraphs r and s, or from improper

c. Inspect spool (43) for nicks, burrs and excessive

adjustment during steps outlined in

wear.

subparagraphs n and o of this adjustment

d. Inspect

procedure.

all fluid passages in body (48) for

obstructions.

4-42 . RELIEF VALVE.

4-52. CHECKOUT. Test operation of front drag link

4-43. INSPECTION. See figure 4-10 and inspect the

valve in complete steering system, paragraph 4-35.

relief valve as follows:

4-53. ADJUSTMENT. For adjustment refer to paragraph

a. Inspect spring (15) for breaks or distortion.

4-36.

b. Inspect ball (13) and ball seat (14) for nicks, scores

4-54. REAR CAM AND VALVE ASSEMBLY.

and excessive wear.

4-55. INSPECTION. See figure 4-12 and inspect the

c. Inspect all pipe components for cracks and stripped

rear cam and valve assembly as follows:

threads.

a. Inspect springs (26, 33, and 48) for breaks and

4-44. CHECKOUT. Test relief valve in complete steering

distortion.

system, paragraphs 4-35 and 4-55.

4-7