TM 9-2320-260-34-1
10-8. DIFFERENTIAL AND DIFFERENTIAL CARRIER REPAIR (Contd)
89.
Position two caps (3) on saddles (5) and install with four washers (2) and screws (1). Finger tighten
screws (1).
90.
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).
91.
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
92.
tighten adjusting nuts (6) to aline gears.
Tighten screws (1) 7-12 lb-ft (9-16 Nm).
93.
NOTE
Ensure a notch of each adjusting nut alines with top center of cap.
To establish helical bearing preload, perform step a. or b.
94.
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 Nm).
Install dial indicator on differential carrier housing (8) so that indicator plunger is perpendicular to
95.
edge of helical ring gear (7).
Turn helical ring gear (7) one revolution in each direction. Runout reading on dial indicator must not
96.
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
97.
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
98.
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
99.
helical ring gear (7) and helical pinion gear (9).
100.
Tighten four screws (1) 290-370-lb-ft (393-502 Nm).
101.
Install two adjusting nut (6) locks (12) to caps (3) with screws (13). Tighten screws (13) 66-85 lb-ft
(90-115 NZm).
Install new safety wire (11) through four screws (1) and two screws (13). Twist safety wire (11) ends
102.
together, cut off and discard excess safety wire (11), and bend twisted ends of safety wire (11) out
of way.
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