TM-9-2520-270-34

HYDROMECHANICAL CROSSDRIVE, TRANSMISSION HMPT 500 AND TRANSMISSlON CONTAINER ASSEMBLY

TECHNICAL MANUAL; DIRECT AND GENERAL SUPPORT MAINTENANCE

NOVEMBER 1984

TM-9-2520-270-34 - Page 271 of 933

TM 9-2520-270-34

CAUTION

Pilot valve piston and piston bore are precision

fit parts. Do not drop, scratch, or nick piston.

Equipment can be damaged.

3. REMOVE SPRING (1) AND PILOT VALVE

PISTON (2) FROM PILOT VALVE

HOUSING (3).

6. CHECK PISTON BORE (5) IN

HOUSING (3).

a.

b.

c.

Using micrometer caliper set and

small hole gage set, measure inside

diameter of bore (5).

If measurement is 0.3135 inch

(7.96 mm) or less, go to step 7.

If measurement is more than

0.3135 inch (7.96 mm), replace valve

assembly and go to END OF TASK.

4. CLEAN FLUID REGULATING VALVE

ASSEMBLY (4).

a. Clean housing and piece parts. See

page 2-2.

5. INSPECT FLUID REGULATING VALVE

ASSEMBLY (4).

a. Inspect housing and piece parts. See

page 2-5.

7. CHECK SPRING (1).

a. Using indicator caliper, measure free

length of spring (1). Replace spring if

free length is less than 1.665 inches

(42.3 mm).

GO TO NEXT PAGE

Change 2

3-30.1