TM-9-2320-285-24-2
TRUCK TRACTOR, YARD TYPE, 43,500 LB GVW, DED, 4X2, ARMY MODEL M878A1
TECHNICAL MANUAL; ORGANIZATIONAL, DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL
OCTOBER 1985
TM-9-2320-285-24-2 - Page 301 of 698
TM 9-2320-285-24-2
3-29.
TROUBLESHOOTING SYMPTOM INDEX (CONT)
Para/Malfunction Page
Seat binds, or does not, slide smoothly, when adjusted
backward or forward
.......................................................................................
3-32/4
3-298
Weight adjustment handle feels loose, has no tension .
..............................................
3-32/5
3-298
Seat or back cushions are separating from pans.
.......................................................
3-32/6
3-299
Seat has collapsed
.......................................................................................
3-32/7
3-299
Door sticks, or will not open or close.
..........................................................................
3-32/8
3-299
Door window will not raise or lower, or will not travel
smoothly
.......................................................................................
3-32/9
3-300
Right side or rear window will not close fully.
..............................................................
3-32/10
3-300
Right side or rear window will not slide or will not
slide smoothly
.......................................................................................
3-32/11
3-301
Cab drafty
.......................................................................................
3-32/12
3-301
Cab vibrates excessively
.......................................................................................
3-32/13
3-301
3-30.
FIFTH WHEEL TROUBLESHOOTING
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1.
FIFTH WHEEL JAWS DON’T OPEN
Step 1.
Check if secondary lock handle is out (unlocked position).
a.
If secondary lock handle is in (locked position), pull hair pin clip from secondary lock handle, pull
secondary lock handle out, and reinsert hair pin clip outside fifth wheel plate (prevents secondary lock
handle from returning to locked position).
b.
If secondary lock handle is out (unlocked position), proceed to step 2 below.
Step 2.
Pull out fifth wheel trip rod fully while watching fifth wheel jaws.
a.
If fifth wheel jaws open, proceed to step 4 below.
b.
If fifth wheel jaws don’t open, proceed to step 3 below.
Step 3.
Check if fifth wheel jaws are adequately lubricated.
Inspect fifth wheel jaw spring.
a.
If fifth wheel jaws are not adequately lubricated, lubricate (para 2-63d).
b.
If fifth wheel jaw spring is broken, replace (para 3-33c).
c.
If fifth wheel jaws are adequately lubricated and fifth wheel jaw spring is not broken, disassemble fifth
wheel jaw components and replace as required (para 3-33c).
3-295
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