ESP 19
Lift Chain Adjustment
1. Raise the platform to the maximum height. Then, lower the platform while
someone verifies that all sheaves (pulleys) are turning and that the chains are
not visibly damaged or worn.
2. Remove the plexiglass cover from the base.
3. When the platform is fully lowered, the lift chains should be equally tight.
Check each lift chain at mid-span. The lift chains should flex about 1/2 to 3/4
inch (12 to 19 mm), but there should be no loose play.
4. If a lift chain is loose, tighten the related clevis, Figure 4-12. Tighten the clevis
lock nut until the lift chain just becomes snug. Do not over-tighten any lift
chain. (An over-tightened lift chain will raise the platform from its rest position
at the bottom of the base slide ways).
5. After making a lift chain adjustment, verify that at least 1/8 in. (3 mm) of the
threaded clevis rod extends beyond the lock nut. Also recheck the slack of all
lift chains at mid-span; verify that all lift chains are equally snug.
6. If a single lift chain requires frequent adjustment, the clevis lock nut is proba-
bly worn. Replace any clevis lock nut that does not hold position during use.
7. Replace the plexiglass cover.
LIFT
CHAINS
LIFT
CHAINS
LOCK
NUT
LOCK
NUT
CLEVIS
CLEVIS
Figure 4-12. Lift Chains Adjustment
4-14
