1. Manual Controls - Check all manual controls for proper operation.
2. Electrical Connection - Check for worn or frayed wires, for loose connections and for damage to or improper operation of push button assembly
3. Limit Switch - Check the upper and lower limit switch by running the hook without load and at the slowest speed obtainable, to the maximum up and maximum down positions. Then test with increasing speeds up to maximum. The switch should shut the hoist off before the bottom block contacts the rod or weight type limit switch at the upper extreme. 1 1/2 Wraps of rope should remain on the drum at the shut-off point at the lowest extreme. If adjustment is necessary refer to manual.
4. Hook - Check for cracks or deformation, Check for damaged or missing latch, a bent or twisted hook indicates overloading or abuse of unit. Other load bearing components o0f the hoist or trolley should be inspected if overloading is apparent or suspected. the bottom hook should swivel freely.
5. Wire Rope - Check for proper seating in drum grooves. Check for wear, unstranding, fraying, kinks or broken wires in wire rope & end connections.
6. Hook Drift - With a load the hook should stop promptly when the push button is released. Hook drift of more than 2 inches indicates that either one or both of the hoist brakes is malfunctioning. Refer to manual for adjustment or repairs.
7. Unusual Conditions - Excessive noise, oil leaks, etc. should be investigated.
8. Lubrication - Check the level and condition of the gearcase lubricant. The level must be maintained at the gearcase level plug. If the level is low, check for leaks. Make repairs as necessary. Lubricate wire rope and other points as required.
9. Hook - Check hook retaining nuts and collars and the means used to secure them. Replace hook if throat opening exceeds Maximum.
10. Load Brake - Check the function of the load brake by lifting a light load 6 to 12 inches from the floor. Disconnect Power and manually open the motor brake. The load may creep slowly which is acceptable. If the load falls to the floor instantly the brake is malfunctioning and should be replaced.
11. Contactors - Check for burned or badly pitted contacts.
12. Push Buttons - Check the ground connections to be sure that the wire cores from the push button cable and the power cord are secured. Tighten the grounding screw and replace the lock washer if it is missing.
13. Bearings - Check all bearings for noisy operation and wear.
14. Hardware - Check for loose bolts, nuts & rivets.
15. Wire Rope - check the condition of wire rope. Lightly lubricate the wire rope.
WARNING !!!! NEVER ALLOW WIRE ROPE TO OPERAT DRY.
16. Warning Labels - Check for absence or Illegibility of warning decals and tags and replace if necessary.
17. Supporting Structure Or Trolley - Check for continued ability to support the imposed loads. Check for loose suspension or support bolts, axle nuts, etc.
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Source: Superior Fabrication Company LLC (Community Member)