Clark GEX20 - Lift Chains

Group 34, Uprights
34-3-4 • Upright Inspection SM 765, Nov ’06
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Hold the caliper square and use light pres-
sure to squeeze the outer jaw tips against the
fork shank. Take care not to accidentally
alter the reading of the calipers.
2. Check the fork blade area to the inside jaws of the
caliper.
3. If the inside jaws fit over the fork in the blade area,
wear exceeds allowable 10% wear and a new set of
forks should be installed.
Fork Hanger Wear and Carriage Fork Bar Wear
Inspect the fork hangers and carriage fork bar. Excessive
wear can cause the fork to disengage the fork bars or
reduce fork hanger life.
• If fork hangers are excessively worn, replace the
forks as a set.
• If carriage fork bar is excessively worn, replace the
carriage.
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RTANT
Welding is not recommended for repairing
forks or carriage. Replace the worn parts
with new parts.
Fork Latch and Carriage Fork Stops
1. Check fork latches for proper operation. Latches
should operate smoothly. The spring should be in
good condition and securely lock the fork into posi-
tion. Replace the fork latch if it does not operate
properly.
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A small amount of lubricant can be applied
to the fork latch. Do not over lubricate and
allow lubricant to run down on carriage fork
bar.
2. Check fork stops for widening of notches or round-
ing of top edge. Replace the carriage if fork stops are
excessively worn.
Lift Chains
The following checks should be performed every 50-250
hours to ensure correct chain performance See Section 6
for more complete chain inspection and maintenance pro-
cedures.
Chain Wear (Stretch) - All Lift Chains
Lift chain stretch due to wear in the joints can be mea-
sured using a measuring tape or Clark’s chain check ruler.
Chain Check Ruler - Clark Part Number 59-960-9908
When any section of the chain has worn and increased its
original length by 3% or more, the chain must be replaced.
When checking chain wear, always measure a segment of
the chain that rolls over a sheave.