Hummer H1 Service Manual page 575

9-38 Axles, Suspension, and Frame
NOTE: Backlash must be checked at four equally spaced
points on ring gear and must not vary more than 0.002 in. (0.05
mm) between four points checked.
50. Move ring gear back and forth while holding pinion yoke
stationary. Note backlash registered on indicator.
51. Ring gear backlash should be 0.005-0.009 in. (0.13-0.23
mm) with 0.008 in. (0.20 mm) desired. If backlash must be
adjusted perform steps 52 through 55, if not go to step 56.
NOTE: Tag shims and bearing cups for assembly.
52. Remove four bolts, two bearing caps, bearing cups, shims,
and differential assembly from housing (Figure 9-96).
NOTE: The following example will explain the procedure for
adjusting backlash: If side play was removed using 0.090 in.
(2.29 mm) shims on each side totaling 0.180 in. (4.57 mm) and
backlash, when checked, is found to be 0.011 in. (0.28 mm),
add 0.004 in. (0.10 mm) to shim on ring gear side and subtract
0.004 in. (0.10 mm) from shim on opposite side to correct
backlash. This will result in 0.094 in. (2.39 mm) shim on ring
gear side and 0.086 in. (2.18 mm) shim on other side. Backlash
will be approximately 0.007-0.008 in. (0.18 to 0.20 mm). Total
Shim Thickness remains 0.180 in. (4.57 mm).
53. To increase backlash, install thinner shim on ring gear side
and thicker shim on opposite side. To decrease backlash,
install thicker shim on ring gear side and thinner shim on
opposite side. Do not change total shim thickness.
54. Install shims, bearing cups, differential assembly, and
bearing caps in housing and secure with four bolts.
Tighten bolts to 55-70 lb-ft (75-95 N•m).
55. Mount dial indicator and recheck backlash. If necessary,
repeat steps 52 through 54.
_________________________________________
DIAL INDICATOR J–8001
Figure 9-97: Checking Ring Gear Backlash
RING GEAR TOOTH
56. Remove four bolts, bearing caps, bearing cup, shims, and
differential assembly from housing. Tag shims and
bearing cup for assembly.
57. Install axle housing spreader into holes in axle holding
fixture adapters and install dial indicator to read from each
end of housing. Indicator must have preload setting of
0.020 in. (0.50 mm) (Figure 9-98).
AXLE
HOUSING
SPREADER
J–24385-01
Figure 9-98: Axle Housing Spreader Mounting
CAUTION: Over-spreading of axle housing will damage
housing.
58. Spread housing 0.010 in. (0.25 mm) and remove dial
indicator.
NOTE: Differential bearings must be preloaded to compen-
sate for heat and loads during operation.
®
RING GEAR
HOUSING
PINION YOKE
AXLE HOLDING
FIXTURE ADAPTER