TM-9-2320-272-24-4

TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)

TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 4 OF 4

JUNE 1998

TM-9-2320-272-24-4 - Page 622 of 836

5-105. DUMP

TM 9-2320-272-24-4

7.

Remove eight screws (3), lockwashers (4), four bearing caps (2), and hoist cylinders (5) and (1) from

subframe (6). Discard lockwashers (4).

1.

Both hoist cylinders are disassembled the same way. Steps 1

through 12 cover the left hoist cylinder.

Remove two square-head screws (18) from cylinder base (7) and slide hinge pin (19) out of cylinder

base (7).

2.

3.

4.

Remove three screws (11) from gland (12) and cylinder head (14).

Tap gland (12) free of cylinder head (14) and slide off piston rod (16).

Remove ten screws (10) and lockwashers (9) from cylinder head (14) and hoist cylinder housing (8).

Discard lockwashers (9).

5.

6.

Tap cylinder head (14) free of hoist cylinder housing (8) and slide cylinder head (14) off piston

rod (16).

Remove packing (13) and O-ring (15) from cylinder head (14). Discard packing (13) and O-ring (15).

CAUTION

Use care when performing step 7 to prevent damage to cylinder

bore or piston.

7.

Pull piston rod (16) and piston (17) straight out of hoist cylinder housing (8).

NOTE

5-616