14
Testing Hoist
Hoist should be tested to insure proper operation after completion of assembly and before
placing hoist in service. Test as follow: Suspend hoist from an overhead supporting member
of sufficient strength to carry combined weight of hoist and rated load; connect to air supply
of correct pressure; perform the following checks and adjustments.
Check Control Operation
Depress lever on pendant control briefly to determine that hook travels in the direction to
correspond with control being operated. The control hoses are improperly installed if load
hook travels in a direction opposite to control being operated. When each lever on the handle
is fully depressed, the control lever should attain a full throw with pendant control. The set
screw in the corresponding control cylinder should be turned in if full movement of control
lever is not accomplished. The set screw should be turned out if full movement occurs before
lever is fully depressed. The screw should not extend beyond end of cylinder.
Check Hoist Under Rated Load
Attach rated load to lower hook and check hoist operation.
1. Operate hoist to raise load. Hoist should stop and hold load at that level when control is
released.
2. Operate hoist to lower load from a short distance. Then release control. The hoist should
stop and keep the load at that level.
3.
Operate hoist to lower load and observe rate of speed at which load descends. Adjust
lowering and hoisting speeds to the desired rate of speed as outlined in “Speed
Adjustment”, page 5.
WARNING
Do not lift more than rated load except for test purposes. It can cause chain breakage, hook
deformation and other failures which can result in serious injury and damage. If any load
sustaining parts have been altered, replaced or repaired, hoist should be tested to load at
125% of rated capacity by a designated, qualified person, with a written report recording test
load, as recommended in ANSI B30.16 Safety Standards.
