What should you do when performing periodic maintenance of a crane?
- Use maintenance checklists that include critical safety components as specified by the manufacturer or professional engineer.
- Record problems clearly in the maintenance logbook.
- Follow the company requirements and the manufacturer's manuals.
- Perform the inspection while the engine is off and then again when the engine is on. Engine off checks helps to find any obvious problems and correct them before starting the engine and possibly harming others.
What should you check for?
- Lower hoist to unload rope sheaves.
- Unwind all wire rope from the hoist drum to expose all parts of a rope, making sure that the rope does not rewind in the reverse direction.
- Inspect sheaves, sockets, dead-ends, thimble joints, and all wire rope hardware.
- During rope changes, check the sheaves for worn bearings, broken flanges, proper groove size, smoothness, and contour.
- Inspect all parts of the cable, cleaning wire rope only as required to complete an inspection. Excessive removal of lubrication will lead to damage.
- Re-lubricate rope to prevent corrosion, wear, friction, and drying out of the core.
- Check for ropes that may have been operated dry (unlubricated). Replace dry ropes. There may be hidden damage that is not detected by visual inspection.
- Compare the rope length and diameter with the original dimensions. Lengthening accompanied by diameter reduction is often an indication of interior core defects.
Establish a schedule of rope replacement to change wire rope before it breaks. Periodic replacements do not take the place of inspections. If rope breaks or inspections reveal abnormal wire breakage or defects, reduce the time between replacements. Do not make wire rope slings from used wire rope.
Crane Structure and accessories
- Visually examine the crane structure for deformed, cracked or corroded members in the structure and boom.
- Check for loose bolts or rivets.
- Check for excessive wear on brake and clutch system parts.
- Check for deformed wedges.
- Check for defective cotter keys, pins and guardrails.
- Ensure all mechanical components of the crane is in good working order (gear box, hydraulics, etc.).
- Check for deterioration or leakage in air or hydraulic systems.
- Check for safe and effective operation on hoses, pumps and motors.
- Check levels of fluid.
- Check air cleaners for replacement or cleaning.
Control Mechanisms and Monitoring Devices
- Check all control mechanisms such as cables, brakes and levers for poor adjustment or excessive wear.
- Check accuracy of marking on the load/radius indicator over full range.
- Check for proper operation of load moment indicator, boom angle indicator, boom length indicator and anti two-block system according to the manufacturer's manual.
What are some things to remember when repairing a crane?
- Enter all service inspections and repairs in a crane logbook or file.
- Take a crane to a location where repairs will least interfere with other cranes.
- Ensure that all controllers are placed in the "off" position, and the main switches are open and locked.
- Place on the switch a standard warning tag stating "DO NOT START." The tag must be filled out and signed.
- Place rail stops or make other safety provisions when another crane operates on the same runway.
- Use fall protection equipment.
- Do not carry anything in your hands when going up and down ladders. Items that are too large to go into pockets or belts should be lifted to or lowered from the crane by a rope.
- Prevent loose parts or tools from falling to the floor.
- The area below the crane must be cleared and a barrier erected to prevent injury from a falling object.
- Replace all guards and other safety devices before leaving a crane.
- Remove all stops, tools, loose parts and other material and dispose of them before completing the repair job.
- Keep your equipment clean including batteries, cab and windows, wheels and tracks, deck and car body.
Although every effort is made to ensure the accuracy, currency and completeness of the information, CCOHS does not guarantee, warrant, represent or undertake that the information provided is correct, accurate or current. CCOHS is not liable for any loss, claim, or demand arising directly or indirectly from any use or reliance upon the information.