Clark GEX20 - Carriage and Upright Roller Clearance Checks and Shim Adjustments

Group 34, Uprights
SM 765, Nov ’06 Carriage and Upright Roller Clearance Checks and Shim Adjustments • 34-4-1
IMP
O
RTANT
Before removing any component for over-
haul, make sure the correct repair parts and/
or kits are available.
WARNING
!
An upright or carriage can move unexpect-
edly:
• Do not walk or stand under raised forks
• Kee clear of load and carriage when mak-
ing any check or adjustment
• Keep your arms and fingers away from
moving parts of the upright.
• Block the carriage or upright when work-
ing with the components in a raised posi-
tion.
• Do not reach through open areas of the
upright.
• Never attempt to move or align the rails
by hand. Use a prybar.
Failure to follow these warnings can result in
serious injury.
WARNING
!
Use an approved safety platform to reach the
upper areas of the upright. Never use the
upright as a ladder.
Introduction
Standard and Hi-Lo upright assemblies have two lift roller
sets mounted on the rails, three lift roller sets mounted on
the carriage, and two internal and external (except 2.0/2.5
ton STD) thrust roller set mounted on the carriage.
External thrust roller set used more than 3.0ton trucks.
The triple-stage upright assemblies have four lift roller
sets mounted on the rails, three lift roller sets mounted on
the carriage, and two thrust roller sets (“internal” and
“external”) mounted on the carriage. (see the “Roller Side
Clearance Chart” on next page.)
Each carriage and upright lift roller is nested within its
adjacent rail set. The front “face” of the lift roller handles
front-to-back friction and play between the nesting seg-
ments of the upright assembly, the side “face” of the roller
radius handles side-to-side friction and play. The rollers
Section 4
Carriage and Upright Roller Clearance Checks and Shim
Adjustments