Group 34, Uprights
SM 765, Nov ’06 Upright Chain Inspection, Adjustment, and Replacement • 34-6-5
Standard Upright Chain Length Adjustment
To adjust chain length on the standard upright use the fol-
lowing illustration and procedures:
1. Fork-to-ground clearance:
a. Set the upright to vertical position.
b. Break the jam nuts loose on the chain anchors.
c. Turn the chain adjustment nuts until clearance
between forks and ground is 10-20 mm (0.40-
0.80 in).
IMP
RTANT
For all chain anchor adjustments:
• Threaded chain anchors must be left free to
pivot in mounting hole.
• Anchor cotter pin heads must be to the
inside of the upright.
• Torque jam nuts to adjustment nuts to
100-200 N⋅m (74-148 ft-lb).
• Make sure chain anchors are secured so
that no twist is evident in the chains.
2. Carriage roller position:
a. Raise carriage about 1 m (3.2 ft) and smear a
bead of grease on the bottom 75 mm (3 in) inner
rail in the area of the roller pattern.
b. Tilt upright fully back and completely lower.
c. Raise carriage about 1 m (3.2 ft) and measure the
distance from where the center of the bottom car-
riage roller stopped to the bottom edge of the
inner rail. Distance should not be less than 20 mm
(0.80 in) or chain length adjustment is required.
3. Carriage stop-to-upright:
a. Lift upright to its full height and check for clear-
ance on the carriage safety stop.
b. If the carriage stop hits the upright stop, adjust
the chain anchor adjustment nuts out until there is
at least 3 mm (0.12 in) clearance between the
stops.
IMP
RTANT
The carriage stop must not be allowed to con-
tact the upright stop under any circumstance
during normal operations.
If all three chain length requirements listed above cannot
be met, the tire diameter may be out of the design range
allowance. Also, excessive tire wear will decrease carriage
stop clearance.
Oversized tires will reduce the bottom carriage roller
engagement on the inner rail when the carriage is in the
lowered position. The fork-to-ground clearance can devi-
ate from the 10-20 mm (0.40-0.80 in) allowance by a
small amount if necessary to maintain the safe 20 mm
(0.80 in) clearance of the bottom carriage roller to the
lower edge of the inner rail.
Triple-Stage and Hi-Lo Upright Chain
Length Adjustments
Triple-stage uprights use two chain sets; one set for car-
riage lift and one set for rail lift. Adjustment anchors for
the lift cylinder stage are located at the back of the outer
rail. Adjustment anchors for the primary lift stage are
behind the primary cylinder. Carriage chain anchors are
not intended for adjustment.
Hi-Lo Uprights use one chain set for carriage lift.
For TSU inner rail lift chains, chain length must be
adjusted if the difference between the bottom of the inner
rail and the outer rail is greater than 10 mm (0.40 in).
For the TSUand Hi-Lo primary cylinders lift chain, the
chain length must be adjusted if:
• The fork-to-ground clearance is less than 5 mm
(0.20 in) or more than 25 mm (1.0 in) when the
upright is vertical.
• The center of the bottom carriage roller comes
within 20 mm (.80 in) of the bottom edge of the
inner rail.
• The carriage safety stop hits the inner rail stop at
full lift height.
To carriage
Adjust chain
length here
To Next Page
Loading...
