Common sense of crane maintenance

Daily maintenance: carry out inspection and maintenance records before each shift.

1. Check the oil amount of each reducer. If it is lower than the specified oil level, add oil in time. The oil must be clean, and no corrosives and unclean oil can be mixed.

Oil label for each reducer: hoisting mechanism reducer: 70# industrial gear oil

Rotary structure reducer: 90# gear oil
Traction mechanism reducer: 70# industrial gear oil

2. Check the lubrication of the hoisting mechanism drum bearing and the bearings at both ends of the traction mechanism drum. If necessary, add No. 2 calcium-based grease to ensure that there is oil in the oil cup.

3. Apply grease to the slewing mechanism, the large and small gear pairs, and the slewing rolling bearing.
4. Check whether the power cable is damaged, whether the connection is loose or worn, and remove the dust from the electrical equipment.

5. Check the contact and corrosion of the contacts of each contactor and controller.

6. Check the connection bolts for any falling off, and tighten and supplement them in time.

7. Check the lifting wire rope and traction wire rope. If the number of broken strands exceeds 5% or the nominal diameter wear exceeds 5%, the wire rope should be renewed. Check whether the fixed end of the wire rope is firm and whether the rope clamp bolt is loose, and deal with it in time.

8. Check each safety device; if it fails to work, it should be adjusted or repaired in time. Especially if the lifting moment is limited to the limit of the lifting weight, its reliability should be ensured.

9. Check the braking efficiency of the hoisting mechanism and the slewing mechanism. If it is not sensitive and reliable, it should be adjusted in time.

Regular maintenance: once every half month, and make inspection and warranty records.

1. Carry out daily maintenance.

2. Inject No. 4 calcium-based grease to the hoisting guide pulley, the tie rod and the support, the pulley and wheel of the luffing trolley, the pulley of the hook block, and the slewing bearing.

3. Since the length of the hoisting and luffing wire ropes is elongated after a period of use, it is necessary to readjust the luffing wire ropes and readjust the hoisting height limiter and the luffing limiter.

4. Tighten the connecting bolts of various parts, the wire rope pressure plate, and the bolts or nuts at the rope clip once, and replace them if necessary.

5. The insulation of each power consumption or power transmission equipment must be reliable and have no leakage.

three. Periodic inspection: make a record of inspection and handling of problems once every six months.

1. In the process of transportation and storage, the metal structural parts should be prevented from being damaged, and the structural parts should be prevented from being deformed.

2. Check the metal structures and components for cracks in the welding area or materials, and check whether the structural parts are corroded. If found, they should be dealt with in time, and they should not be used without repair.

3. For each connecting bolt, if the pin shaft is found to be excessively worn or deformed, it should be renewed.

4. Clean the reducers and refill the lubricating oil, disassemble the rolling bearings for cleaning and clean the sliding bearings, and add or apply grease during assembly.

5. Apply grease to the rotary open gear pair.

6. Check and adjust all brakes and safety devices.

7. Overhaul or replace some parts with greater wear and tear, such as trolley traveling wheels, pulleys and sliding bushings, rotary mechanical pinions, etc.

8. Overhaul and replace hoisting and luffing wire ropes.

9. When overhauling each controller in the electrical operation, lubricating oil should be added to the rotating part, and the arc crater of the dynamic and static contacts should be polished. Overhaul the distribution box, remove the dirt and dust on each contactor wedge iron, and check the coil insulation.

10. Overhaul and replace various wires and cables.

11. After the completion of each project, each component must be painted once to prevent corrosion of fixed cranes and painted once within half a year to one year.

Maintenance of hydraulic jacking system:

1. The hydraulic oil used in the hydraulic pump station shall be filled and replaced in strict accordance with the provisions of the hydraulic system manual, and the oil tank shall be cleaned regularly.

2. After the pressure of the relief valve is adjusted, it must not be changed at will. Before each jacking, the oil pressure gauge must be used to check whether the pressure is normal.

3. Always check whether the pipe joints are tight, and no oil leakage is allowed.

4. The oil filter should be regularly checked for blockage and whether the adjustment value of the safety valve has changed.

5. If there is leakage in the oil pump, oil cylinder, and control valve, it should be repaired in time.

6. When starting in winter, it should be turned on and off, repeated several times, until the oil temperature rises and the control valve is sensitive, and then it starts to run officially.

7. Every time the oil pump is started after final assembly and overhaul, first check whether the outlet and inlet are reversed, whether the motor rotates in the correct direction, and whether there is air leakage in the oil suction pipeline.

Glory Rail is a company specializing in crane rail solutions for crane systems.

We can provide some technical references for crane rail track systems.