Group 34, Uprights
34-5-2 • Cylinder Removal, Shimming, Overhaul, and Replacement SM 765, Nov ’06
3. Remove the cylinder rod retaining bolt.
In Hi-Lo Upright, Remove the Cylinder Hose.
4. Slowly lift the inner (or intermediate) rails off the top
of the cylinder to expose the cylinder rod top.
CAUTION
!
CAUTION
!
Block rail in up position.
5. Insert shim(s) over rod end of cylinder with the
shorter stroke to compensate for unequal stroke
length.
6. Slowly lower the inner or intermediate rail back onto
the rod ends.
WARNING
!
Do not try to maneuver the cylinder or rails
with your hands. Use a prybar.
7. Replace cylinder rod retaining bolt to secure rod end
into inner or intermediate rail mounting hole. Torque
the cylinder rod retaining bolts to 20-25 N⋅m (14.8-
18.5 ft-lb).
8. Repeat the racking test and adjustment until no rack-
ing is evident during upright lift extension.
9. Check all upright functions before returning the truck
to service.
Primary Cylinder Removal and
Replacement (Hi-Lo & TSU)
Remove the primary cylinder for replacement only. Cylin-
der can be overhauled without removing it from the
upright. See “Cylinder Overhaul” for procedures.
1. Make sure the cylinder is completely collapsed and
pressure is released.
2. Disconnect and cap the hydraulic line at the base of
the cylinder.
3. Remove and discard cotter pins from chain anchor
bolt pins on the cylinder.
4. Remove the pins, draw the chain through the sheave,
and drape the chain over the carriage.
5. Remove the snap ring holding the chain sheave (and
hose bracket, if equipped) on the rod end and move
assembly off top of rod.
Load Lowering
Flow Valve
Snap Ring
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