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 268 of 933

TM 9-2520-270-34

7. CHECK PISTON (1).

a. Using micrometer caliper set,

measure diameter of piston (1).

b. Replace piston (1) if measurement is

less than 1.248 inches (31.70 mm).

9. CHECK FLUID REGULATING VALVE (3).

a.

b.

9.1.

3-28

Using 1/4-inch pin punch, push pilot

valve piston (4) gently into housing (5)

and release.

If piston (4) does not return to

original position, go to step 9.1. If

piston does return to original position,

go to step 10.

REPAIR MAKEUP PUMP FLUID

REGULATING VALVE, page 3-30.

Change 2

8. CHECK SPRING (2)

a.

b.

Using inside indicator caliper, measure

free length of spring (2).

Replace spring (2) if free length is

less than 3.28-inches (83.3 mm).

10. INSTALL CONTROL VALVE PISTON (1)

AND SPRING (2).

a. Coat piston (1) with transmission oil.

b. Install piston (1) in piston bore (6).

c. Install spring (2) in piston (1).