Crane Maintenance Basic: Crane Maintenance Procedures

crane maintenance is important to ensure the safety of crane machines. Regular crane maintenance is required to prevent crane accidents. How to maintain your crane machines? Generally, the crane maintenance should be conducted by designated persons who are professional and experienced. Dongqi Crane is able to provide your professional crane maintenance services with efficiency. In the following, the crane maintenance procedures are presented for your sake.

Crane maintenance procedures

1. Crane maintenance repair cycle:

• A period of one to three months
• Time of four to eight hours

2. Crane maintenance repair contents:

• The replacement of the wire rope worn reached the limits. For safety, casting lane, lane rope front will be replaced once about every six months, to ensure good lubrication.
• The replacement of badly worn pins, screws.
• The replacement of the brake shoe reached wear limit (50% of original thickness).
• The replacement of damaged hook, shields, pulley; hook inspection once a year.
• The adjustment part of the installation, the deviation caused by the use and eliminate hidden dangers.
• The replacement of the failed safety device.
• Repair or replacement the motor brushes, controller, contactor contact burns.
• Limit adjustment.
• The replacement the motor.
• Took over the inspection of gear wear; replacement the parts to be scrapped. Driving casting lifting mechanism, coupling, dismantling once every 3 months to ensure good lubrication.
• Check the reel.
• Change gear (traveling crane) clean oil or replace the main drive gear.
• The lubrication points refueling to ensure good lubrication.
• Deal with the problem usually found in the inspection point.
• Replace the brake.

3. Maintenance standard:

A. Brakes:

• It should be replaced that pin wear more than 5% of the original diameter or exceeds 0.5mm oval.
• When lifting mechanism uses double brakes, it shall ensure that each brake safety factor of 1.25 times.
• Adjust the side wheel and brake shoe gap to be equal.
• When the brake is released, the tilt, imbalance brake shoe and brake wheel brake shall not exceed the width of 1/1000.
• The brake wheel center and the center brake shoe relative error does not allow more than 3mm.

B. Brake drum:

• Outer roughness should not be less than 3.2.
• Grind groove surface area of 60%, depth 3mm.
• Brake wheel surface temperature does not exceed 200 ℃.
• After assembled brake wheel, face run out shall not exceed the standard.

C. Wire rope:

• Rope surface wear reaches 40%, casting, blast furnace traffic by 20%, although not broken, it should be scrapped.
• Surface wear and broken wires should have reduced requirement.
• Whole rope strand breaks should be scrapped.
• Wire rope on the drum plate should be tightened all; when the hook to the lowest position, leaving a minimum of 2 to 3 turns on the reel.
• Change new wire rope wire rope must confirm the specifications and mechanical properties to meet the original design requirements.

4. Crane maintenance on reducer:

• Deceleration oil surface should be maintained between the shaft needle two engraved lines.
• Feet bolts and joints can not have any screw loose.
• No any obvious leakage.
• When the cap is screwed tight, gearbox combination surface gap is not greater than 0.03mm.
• Tooth wear of 4,5 crane hoisting mechanism gear up to 15% of the thickness, to hoist up to 10%; other agencies gear wear reaches 25% of the thickness.

5. Crane maintenance on pulley

• Pulley sheaves wear wall thickness reached 10%, should be scrapped.
• Pulley rope diameter bottom wear more than 25% should be scrapped.
• Cracked or damaged rim portion should be scrapped.
• If the relative rotation between pulley shaft hole and the bearing outer ring, should be scrapped
• Pulley should be flexible rotation, without jamming.

6, Crane maintenance on the teeth took over

• Gear coupling grease once every three months.
• Operating agencies gear up to 20% over the amount of wear, lifting mechanism up to 10%.

7, Crane maintenance on hook:

• Hook actual opening is greater than the nominal opening 15% should be scrapped.
• Hooks dangerous section wear reaches a height of 10%, put steel traffic up to 5% should be scrapped.
• Hooks found permanent deformation should be scrapped or to be replaced.
• Inspection once a year, if found serious cracks, should be scrapped.

More information on crane maintenance procedures, please contact us. All your crane maintenance problems can be solved efficiently by Dongqi crane maintenance services.