Clark GEX20 - Cylinder Removal, Shimming, Overhaul, and Replacement

Group 34, Uprights
SM 765, Nov ’06 Cylinder Removal, Shimming, Overhaul, and Replacement • 34-5-1
Cylinder Types
Standard uprights use two lift cylinders. Hi-Lo and Triple
stage uprights use three cylinders, a primary (center-
mounted) cylinder, and two secondary cylinders. All pri-
mary cylinders used on Hi-Lo and triple-stage uprights
(TSUs) are piston cylinders. The lift and secondary cylin-
ders used on standard, Hi-Lo uprights and TSUs are either
piston or ram cylinders.
IMP
O
RTANT
Before removing any component for over-
haul, make sure the correct repair parts,
seals, and gasket sets are available.
CAUTION
!
CAUTION
!
To remove, or partially remove, the cylinders
from the upright for shimming or overhaul,
start with the truck in a safe position:
• Ignition off
• Parking brake applied
• Directional lever in neutral
• Forks lowered completely
• Wheels blocked.
Lift Cylinder Shimming Procedure
To shim the lift cylinders to correct unequal cylinder
stroke:
1. Fully lower upright until both lift cylinders are col-
lapsed.
2. Attach a hoisting strap to the tie bar of the inner rail
or intermediate rail tie bar of TSUs.
CAUTION
!
CAUTION
!
Make sure hoisting equipment is of adequate
capacity and in good working order.
Upright Upright
Type
Number Cylinder Type
<GEX20-30>
Standard pneu V2324 Piston-Type Lift Cylinder
TSU pneu M2324 Piston-Type Secondary Cylin-
der
Hi-Lo pneu H2317 Piston-Type Secondary Cylin-
der
Section 5
Cylinder Removal, Shimming, Overhaul, and Replacement