Direct Lift PP8S - Manual (Page 22)

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A light surface corrosion on exposed outer wires is normal. Penetrating Oil should be applied during
monthly periodic inspection.
c. That there are no areas on the cable that have a greatly reduced diameter or “necking”, reference
Daily Inspection & Maintenance. When any cable is found with excessive necking, all cables must
be replaced immediately.
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.