Product Manual

CO7338.1 24 IN20525 Rev D 3/30/2009
d. That cables do not have excessive stretch. It is normal for new cable to require
adjustment during “break-in”, after which small periodic adjustments may be required.
However, if a cable that has been in service for 6 months should suddenly require
frequent adjustments or has used all the cable adjustment available, all cables must be
replaced immediately.
e. If any cable is found to be in need of replacement, the entire cable set must be replaced
immediately.
f. Cables are expendable items and should be replaced as a set every 20,000 cycles
(estimated) or every 6 years, unless earlier replacement is indicated during inspection.
2. Sheaves and Pins
Inspect sheaves and pins in yokes and runways. Sheaves are expendable items. Sheaves
and pins should be replaced when worn. Use of sheaves and pins with excessive wear will
lead to reduced service life of cables.
2.1 Inspect sheaves (pulleys) in yoke ends with lift in lowered position or resting on the locking
latches.
a. Hold lowering handle down and pull on cable in column to create slack in cables.
b. Check for excessive side to side wobble. Grasp rim of sheave and attempt to wobble
(tilt) side to side. If sheaves wobble (tilt) more than 3/16” (4.8 mm) side to side or move
up and down on shaft more than 1/32” (0.8 mm), the sheave and pin (shaft) should be
replaced, refer figures below.
c. Check sheaves and replace if cracks are found.
d. Check for ease of rotation. If sheaves do not turn freely, the sheave and sheave pin
should be removed, inspected, lubricated, and reinstalled or replaced.