Hummer H1 Service Manual page 579

9-42 Axles, Suspension, and Frame
U-JOINT REPLACEMENT
1. Remove propeller shaft.
2. Remove grease fitting from cross (Figure 9-111).
3. Remove two bearing cups from cross (rear shaft only).
4. Remove snap rings from bearings in yoke.
5. Position propeller shaft in vise with 1-1/8 socket between
vise jaw and bearing being removed. Be sure open end of
socket is facing bearing cup (Figure 9-111).
BEARING
LARGE
SOCKET
Figure 9-111: U-Joint Cross and Bearing Installation
6. Place 11/16 socket between opposite bearing and vise jaw.
Be sure open end of socket is facing vise jaw.
7. Tighten vise to press bearing cup out of yoke. Then
remove bearings from cross.
8. Reverse position of sockets and press remaining bearing
out of yoke.
9. Remove cross from yoke.
10. Pack bearing grease into bearings to hold needle rollers in
place.
CAUTION: Be sure grease fitting on cross faces yoke. Dam-
age to fitting will result if improperly installed.
11. Position cross in yoke.
12. Install first bearing in yoke. Verify bearing cup is aligned
with yoke before pressing in with vise. Damage to cross
and bearing will result if misaligned.
13. Place yoke in vise with 11/16 socket between vise jaw and
bearing cup. Then press bearing cup into yoke far enough
to install snap ring.
14. Install remaining bearing in yoke.
15. Place yoke in vise with 11/16 socket between bearing cup
and vise jaw.
16. Press bearing cup into yoke far enough to install snap ring.
17. Press remaining two bearings in slip yoke and install snap rings.
18. Install two additional bearing cups on cross (rear shaft
only).
19. Install grease fitting in cross.
20. Lube joints and yokes as required.
SHAFT
YOKE
CROSS
SMALL
SOCKET
BEARING
_________________________________________
SUSPENSION HEIGHT MEASUREMENT
NOTE: Before checking suspension height, check the follow-
ing items:
a. Broken spring coil or shock absorber.
b. Winch plus other aftermarket accessories installed on
the front end of the vehicle.
c. Worn out control arm bushings.
d. Worn out ball joints.
e. Damaged frame or suspension components.
1. Check tire pressure, front tires should be at 26 psi and rear
tires at 28 psi, curb weight.
2. Ensure that tires and rims are original equipment as
supplied by AM General.
3. Position vehicle on level surface.
4. Remove any load from vehicle interior or roof rack. Tools,
luggage, recreational equipment, or similar items may
produce faulty measurements if left in the vehicle.
5. Jounce vehicle front and rear 2-3 times and allow
suspension to settle.
6. Check suspension height by measuring distance between
bottom edge of each lower control arm front crossmember
bracket and shop floor as indicated by dimension "X"
(Figure 9-112).
Figure 9-112: Suspension Height Measurement
a. Suspension height is acceptable if height measured at
each side is 16 inches (40.6 cm) or greater and left
right measurements do not differ more than 3/4"
(19mm).
b. Replace springs only if height measured is less than
16 inches (40.6 cm) at either side, or if right-left
variation exceeds 3/4" (19mm).
X
X
®