TM-9-2320-260-34-1
TRUCK, 5-TON, 6X6, M809 SERIES (DIESEL)
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE; VOLUME 1 OF 2
JULY 1994
TM-9-2320-260-34-1 - Page 608 of 657
TM 9-2320-260-34-1
10-8. DIFFERENTIAL AND DIFFERENTIAL CARRIER REPAIR (Contd)
89.
90.
91.
92.
93.
94.
95.
96.
97.
98.
99.
100.
101.
102.
Position two caps (3) on saddles (5) and install with four washers (2) and screws (1). Finger tighten
screws
(1).
Start two adjusting nuts (6) in threads of saddles (5) and caps (3). Move caps (3) as necessary to
aline threads to adjusting nuts (6).
Turn adjusting nuts (6) by hand until contact is made with races (4).
Ensure helical ring gear (7) alines with mating helical pinion gear (9). If necessary, loosen and
tighten adjusting nuts (6) to aline gears.
Tighten screws (1) 7-12 lb-ft (9-16 N
•
m).
NOTE
Ensure a notch of each adjusting nut alines with top center of cap.
To establish helical bearing preload, perform step a. or b.
a. Alternately tighten adjusting nuts (6) to a total 1.5 to 2.75 notch widths.
b. Tighten each adjusting nut (6) 15-35 lb-in. (1.7-4.0 N
•
m).
Install dial indicator on differential carrier housing (8) so that indicator plunger is perpendicular to
edge of helical ring gear (7).
Turn helical ring gear (7) one revolution in each direction. Runout reading on dial indicator must not
exceed 0.008 in. (0.20 mm). If runout exceeds this value, loosen adjusting nuts (6) and screws (1) and
repeat steps 90 through 95.
Reposition dial indicator so that plunger contacts tooth (10) and detects motion in plane of rotation
of helical ring gear (7) as the gear rotates.
Hold helical pinion gear (9) still and rock helical ring gear (7) back and forth. Observe backlash
reading on dial indicator.
Backlash should be 0.005-0.015 in. (0.127-0.381 mm). If reading is outside of these limits, replace
helical ring gear (7) and helical pinion gear (9).
Tighten four screws (1) 290-370-lb-ft (393-502 N
•
m).
Install two adjusting nut (6) locks (12) to caps (3) with screws (13). Tighten screws (13) 66-85 lb-ft
(90-115 N
Ž
m).
Install new safety wire (11) through four screws (1) and two screws (13). Twist safety wire (11) ends
together, cut off and discard excess safety wire (11), and bend twisted ends of safety wire (11) out
of way.
10-50
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