Sunday, 23 July 2017 16:38

Proper lift equipment maintenance not only prolongs machine life, but it is also the first step toward keeping workers safe on the job.The cost of unexpected downtime due to inferior parts or associated components not functioning per specification will increase the equipment’s total lifecycle cost.


How to Maintain hooks

  1. Before use, hooks must be inspected by an experienced rigger.
  2. Remove a hook from service if any of the following are in evidence:
    a. Cracks, nicks or gouges
    b. Twist exceeding 10 degrees from plane of unbent hook
    c. Damage or malfunction to the latch
    d. Throat opening exceeding 15 percent
    e. Wear exceeding 10 percent of original dimension
    f. Damage from heat
    g. Unauthorized repairs
  3. Cracks, nicks and gouges should be removed by a qualified person. Grind lengthwise, following the contour of the hook.
  4. If removing the damaged area results in a loss of more than 10 percent of the original dimension, the hook must be replaced.
  5. Never repair, alter or reshape a hook by welding, heating, burning or bending, unless approved by the hook manufacturer.
  6. When lifting, ensure the hook, not the latch, supports the load. The sling or lifting device must always be seated properly in the bowl of the hook.
  7. Never side load, back load or point load a hook. All reduce hook strength and create an unsafe condition. Point loading can reduce hook capacity as much as 60 percent.

How to Maintain Wire Rope

  1. Put on gloves before handling and checking the condition of your wire ropes.
  2. Wire ropes should be cleaned at intervals using a brush to remove hardened deposits of grease, which prevent the penetration of lubricants.
  3. Do not use solvents for cleaning. They may destroy the textile or synthetic components which make up the wire rope.
  4. The wire rope must be checked over its entire length.
  5. Check the level of wear and the proper functioning of the sheaves: One defective sheave in a circuit may result in premature wear to the wire rope.
  6. Apply grease using the product recommended by the manufacturer. The lubrication intervals must take the specific conditions of usage into account: proximity to the coast, metallurgical or chemical environment, harsh climatic conditions, etc.
  7. All wire ropes showing a broken strand, a collection of visible broken wires, deformation, corrosion, kinks, pleats, crushing, etc. should be scrapped.
  8. A worn or damaged wire rope should only be replaced with a rope recommended by the equipment manufacturer.
  9. When replacing the wire rope, it must be possible to brake the drum (coil) to prevent the rope from unwinding too fast or dragging when winding up.
  10. The length of the new wire rope should match the crane configuration and should cover all drum winding layers.

How to Maintain Mobile Crane Transmissions

  1. Follow fluid and filter rules set by the transmission manufacturer. Many transmission failures can be avoided with adherence to service schedules.
  2. Transmission fluid cools, lubricates and transmits hydraulic power. Too little fluid and the torque converter, bushings, bearings and clutches will not receive an adequate supply of oil. Too much oil can cause it to aerate, resulting in overheating.
  3. Oil leaks primarily occur around the side of the transmission casing, external oil cooler or where power take-off points are located. Check these points frequently.
  4. Try to keep a transmission free of contaminants. Solid foreign bodies have a detrimental effect on bushings and roller bearings.
  5. Driveshaft components, the oil cooler, and transmission filter regulator should be examined at 25,000 mile intervals.
  6. Check fastener tightness. Bolts with an incorrect torque can cause vibration. Stripped threads may lead to transmission removal for main case replacement.
  7. Check electronics and wiring harnesses as part of an inspection.
  8. Have crane operators report potential troubles such as odd automatics shifts, fluid leaks and unusual noises and take action to avoid downtime.


Source : https://goo.gl/RnKB8m



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