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 361 of 933

REPLACE PRIORITY VALVE PISTON

DESCRIPTIO N

This task covers: Remove (page 4-61). Install (page 4-63).

INITIAL SETUP

Tools:

General mechanic’s tool kit:

automotive — (Item 33, App C)

Inside/outside indicator caliper —

(Item 41, App C)

Micrometer caliper set — (Item 52, App C)

Retaining-ring pliers — (Item 59, App C)

Socket wrench set — (Item 89, App C)

Telescoping gage set — (Item 93, App C)

Torque wrench — (Item 99, App C)

Materials/Parts:

Gasket

Lock washer (4)

Personnel Required:

Track Veh Rep 63H10

Equipment Conditions:

Transmission mounted on tip-over stand.

See page 2-144.

REMOVE

1. REMOVE ACCESS COVER (1).

a.

b.

Using 3/8-inch drive brace handle and

7/16-inch socket, remove two screws (2)

and lock washers (3). Discard lock

washers.

Remove cover (1).

2. REMOVE PRIORITY VALVE COVER (4).

a.

b.

c.

Using 3/8-inch drive brace handle and

7/16-inch socket, loosen two screws (5)

and lock washers (6). Unscrew each

screw one turn at a time until spring

pressure is relieved.

Remove two screws (5) and lock

washers (6). Discard lock washers.

Remove cover (4) and priority valve

gasket (7). Discard gasket.

GO TO NEXT PAGE

Change

1

4-61

TM 9-2520-270-34

CAUTION

Priority valve cover is under spring pressure.

Slowly remove cover to prevent loss of parts.