SUTPHEN TOWERS, INC. 2012
Manual-2012
_SL75-SA75-SP70.docx
Page 27 of 55
8/31/2012
bolts need to be checked every three (3) months for tightness.
SHEAVES AND CABLES
There are sheaves and cables which are part of the tower extension/retraction system from the
second section up. Each sheave has a bearing and requires periodic lubrication. In the sheave
bearing pin, there is a grease fitting provided. Each sheave needs to be greased every 25 hours
of service, or annually. A high grade chassis grease, designed for heavy duty service, is
recommended.
When servicing the sheaves, the tower should be extended horizontally to maximum position
and the cables wiped free of any dirt and/or grime with a slightly moist Naptha cloth. Then,
lubricate with a thin film of oil. Oil on a cloth permits this to be done easily and adequately.
Stabilizers must be set before performing this operation.
EXTENSION SYSTEM
C
ABLE
A
DJUSTMENT
P
ROCEDURE
Before beginning cable adjustment, be aware that this adjustment not only affects the tension
of the cables, but also the position of the ladder sections. Follow the steps outlined below to
maintain rung alignment throughout all sections as the cables are adjusted.
1. Set up aerial device according to the operator's manual. Rotate the ladder to one side of the
apparatus and position the aerial so the cables below rung level can be serviced from the
ground.
2. Assure the aerial slide areas and the waterway are clean and well-lubricated.
3. Inspect all cables for kinks, wear, and any signs of damage.
4. Extend the ladder at least 2/3 of full extension and stop on extend stroke when the rung
alignment indicator lights.
5. Adjust the retract cables for excessive slack. Loosen the cable rod locknut and tighten the
adjusting nuts, but do not tighten so much as to allow the metal spacers to contact the
cable anchors. (See figure 5 below.) This would put tension on both the extend and retract
cables at the same time, possibly causing excessive cable stretch or damage to other
components. Re-tighten the locknut.
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