TM-9-2320-272-10

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

TECHNICAL MANUAL; OPERATOR'S MANUAL

SEPTEMBER 2004

CHANGE 2

TM-9-2320-272-10 - Page 230 of 481

TM 9-2320-272-10

2-129

(4)

For heavy pulls, install field chocks (15). Perform the following:

(a)

Remove field chocks (15) from storage area at left rear of wrecker body.

(b)

For direct pulls, install chocks (15) facing the load in left and right

rear chock brackets (13) below bumperettes. Insert pin (16) through bracket (13)

and yoke (17) to secure each field chock (15) in place.

(c)

For indirect pulls, install field chocks (15) in left side and rear

brackets (13) for left side pulls or in right side and rear brackets (13) for right side pulls.

(d)

Dig two 12 in. (30

cm) holes at spade end (14) of

chocks (15). Insert chock spade ends

(14) in holes.

(5)

Start engine (para. 2-

12).

(6)

Place transfer case shift

lever (8) in NEUTRAL.

(7)

Unlock safety latch (11)

and push transfer case power take-

off lever (10) back to engage.

(8)

Place transmission

selector

lever (7) in 1-5 (drive).

NOTE

Vehicles equipped with auto-

matic throttle kit/MWO will

automatically increase engine

rpms to the proper range when

the PTO is engaged.

(9)

Pull out hand throttle

control

(1) and set engine speed between

1250 and 1300 rpm as indicated by

tachometer (4).

(10)

Turn on floodlight con-

trol

switch (5) if operation is at night

and tactical situation permits.

(11)

Turn on amber warning

light switch (6), if required, and if

tactical situation permits.

2-24. OPERATION OF MEDIUM WRECKER (Contd)