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 382 of 481
TM 9-2320-272-10
3-33
(c)
Hook chain fall (6) to davit boom roller (3) and to utility chain (7)
securing spare tire (11) and take up slack.
(d)
Remove lock pin (14) from davit boom (2), roller (3) and retaining pin
(4) from davit boom (2) and davit support (5).
(e)
Slide out davit boom (2) until holes in davit boom (2) and davit
support (5) are aligned. Secure in place with retaining pin (4) and lock pin (14).
(f)
Hook chain fall (6) to ring (13) on utility chain (7). Pull hand chain
(12) to take up slack.
(g)
Loosen wingnut (15) securing wheel brace (10) to threaded bar (9).
(h)
Guide threaded bar (9) from notch in davit boom base (8). Lift wheel
brace (10) and threaded bar (9) from davit boom base (8).
WARNING
• Stand clear during hoisting operations. Injury may result if
personnel are struck by a swinging spare tire.
• Use caution when operating chain hoist. Injury may result if
fingers are caught in chain hoist pulley sheave.
(i)
Pull hand chain (12) to slightly raise spare tire (11). Slide spare tire
(11) along davit boom (2) until roller (3) hits stop (1).
NOTE
Spare tire must be turned flat to vehicle body during lowering
operation.
(j)
Pull hand chain (12) to lower spare tire (11) to ground.
(k)
Remove utility chain (7) from spare tire (11) and chain fall (6).
(2) Installation
(M923/A1/A2, M925/A1/A2, M927/A1/A2, M928/A1/A2,
M931/A1/A2, and M932/A1/A2).
(a)
Place utility chain (7) through rim of spare tire (11) and ring (13) on
utility chain (7). Center ring (13) at top of spare tire. Take up slack and hook utility
chain (7) back onto utility chain (7).
(b)
Lower chain fall (6) hook and attach to ring (13).
(c)
Raise spare tire (11) until it clears davit boom base (8).
(d)
Using roller (3), place spare tire (11) in davit boom base (8).
(e)
Lower wheel brace (10), guide threaded bar (9) into notch in davit
boom base (8) and tighten wingnut (15) until snug.
(f)
Remove utility chain (7) from spare tire (11) and chain fall (6).
(g)
Slide davit boom (2) into davit support (5) until holes in davit boom
(2) and davit support (5) are aligned. Secure in place with retaining pin (4) and lock
pin (14).
(h)
Return utility chain (7) and chain fall (6) to tool compartment.
3-11. WHEELS AND TIRES (Contd)
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