Direct Lift PP9 Plus - Manual (Page 23)

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inspection holes and openings in yokes and runways. Check all the following:
a. That cables have no broken wires visible, reference Daily Inspection & Maintenance.
b. That cables are free of severe corrosion and pitting, reference Daily Inspection & Maintenance. 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.
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.
2.2 Fully raise lift. Inspect sheaves (pulleys) in runway ends with lift in raised position.
a. Visually inspect alignment of sheaves, see figure above. Misalignment of sheave(s) indicates exces
sive wear; the sheave(s) and sheave pin should be removed and inspected. Replace as required.
b. Hold lowering handle down to lower lift onto latches. Pull on cables under runway to create cable
slack.
c. Check for excessive side to side wobble. Grasp rim of sheave and attempt to wobble (tilt) side to side,
refer to figures above. If sheaves wobble (tilt) more than 1/16” (1.6 mm) side to side, or move in
and out more than 1/32” (0.8 mm), the sheave and sheave pin (shaft) should be replaced, refer to
figures above.
3. Hydraulic Cylinder