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 243 of 481
TM 9-2320-272-10
2-142/(2-143 deleted)
Change 2
2-24. OPERATION OF MEDIUM WRECKER (Contd)
(5)
For lift-tow operations:
(a)
Attach whiffletree (3) to lifting shackles (4) of disabled vehicle.
Whiffletree (3) is attached the same way as a towbar (12). Refer to step 4c.
(b)
Lower crane block (2) and insert hook (5) through center hole of
whiffletree (3). Refer to crane operation (para. 2-24d).
(c)
Remove two retaining pins (11) and towbar adjustment pins (10).
Slide out leg extensions (9).
(d)
Attach two clamps (8) to clevis (13) of leg extensions (9) and secure
in place with clevis bolts (14) and attached safety pins (15).
(e)
Loosen two tension adjusting nuts (7) on clamps (8).
(f)
Position clamps (8) against front axle (16) of disabled vehicle and
wrap clamp chain (6) around axle and back up through clamp (8). Lock in place by
turning tension adjusting nut (7) until secure.
(g)
Repeat step f with second clamp (8) in position against axle (16) on
opposite side of forward axle.
NOTE
If necessary, adjust length of towbar while performing step h.
Yoke end of towbar should extend one foot or more beyond front
bumper of disabled vehicle.
(h)
After both clamps (8) are secured to disabled vehicle, slide leg
extensions (9) back into towbar (12) and secure in place with adjustment pins (10)
and retaining pins (11).
(i)
Install yoke end of towbar (12) on wrecker pintle hook (16).
(j)
Disengage brakes and remove propeller shafts between
transmission and transfer and place transfer in high range of disabled M939/A1/A2.
(k)
Raise crane block (2) and lift front wheels of disabled vehicle off
ground until towbar is level (parallel to ground).
(l)
To secure from lift-tow operation, reverse steps a through k.
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