Group 34, Uprights
SM 765, Nov ’06
Carriage and Upright Roller Clearance Checks and Shim Adjustments
• 34-4-7
• Replace any defective parts.
3. Add shims to the top and bottom rollers as deter-
mined in the previous steps.
• Install shims with the same number on each side.
• When an odd number of shims is required, always
place the odd shim on the same side on all roller
sets.
4. Use a straight bar to determine the number of shims
to add to the middle roller shaft as shown in the fol-
lowing illustration. This shimming may be asymmet-
ric, meaning the numbers of shims do not have to
match those of the top and bottom rollers.
5. Reinstall all bearings; torque top roller fasteners to
40-45 N⋅m (30-33 in-lb).
Carriage internal thrust rollers must be adjusted after the
carriage is shimmed. Adjust as described previously.
Upright Roller Shimming
Use the following procedures to remove, shim, and
replace rollers. Use the preceding checks to determine the
number of shims required to reduce the roller clearances
to 0.75 mm (0.03 in) or less.
WARNING
!
Use an approved safety platform. Never use
the upright as a ladder.
CAUTION
!
CAUTION
!
The carriage should be removed for shim-
ming or when any service is performed on the
upright. See Section 8, for removal and
replacement procedures.
Upright Roller Removal
1. After the carriage has been removed, lower the
upright rails until both of the secondary (final) lift
cylinders are completely collapsed.
2. Jack the truck and block under the frame so that the
bottom of the upright is approximately 254 mm (10
in) off the floor. See “Lifting, Jacking, and Blocking”
in Group SA for safe procedures.
3. Set the parking brake and block the steer wheels.
4. Tilt the upright to as near vertical as possible.
5. Using a hoist and lifting strap of adequate capacities,
connect the lifting strap to the inner rail on standard
and Hi-LO uprights or intermediate rails on triple-
stage uprights. Lift hoist to remove slack from the
strap.
6. Disconnect the flow control valve manifold from the
upright bracket.
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