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How to Check and Test the Tower Crane Reducer After Assembly?

Apr. 09, 2020

As a Tower Crane Manufacturer, share with you. After the assembly of the Custom Tower Crane reducer is completed, before the upper and lower boxes are fastened and the coupling bolts are tightened, check whether the through-hole gland of the reducer is against the rolling bearing jacket and the upper and lower sub-box surfaces for clearance. When the gap is large, grease should be applied to the inner wall of the bearing and all bolts should be tightened to avoid deformation and rapid destruction of the rolling bearing jacket when the coupling bolts are tightened.

8 T Top kit Tower Crane

8 T Top kit Tower Crane

The sign of good installation quality of the rolling bearing is that all parts are cleaned, there is no dirt in the box, and the transmission part can be rotated smoothly by gently turning the hand by hand, without jamming, impact and noise; the temperature rise of long-term operation does not exceed 80 degrees. If defects such as jamming, noise and excessive temperature rise are found, the trial operation should be stopped immediately, the fault should be checked and eliminated, and reinstalled.

When assembling the reducer, check the meshing quality of the gear pair. It is required that the flank clearance is appropriate, the contact surface is large and uniform, and there is no noise and impact sound.

The contact marks on the gear meshing surface should be no less than 60% of the tooth height and no less than 50% of the tooth width and should be evenly distributed. The uniformity of the gear meshing surface along the tooth height depends on the processing quality of the gearbox, the parallelism of the shaft, the allowable inclination of the shaft and the deflection of the gear tooth direction. The parallelism of the shaft can be measured with a rod vernier caliper.

After the reducer is assembled, it needs to be tested and then run-in test. Before the running-in test, clean light oil should be injected into the reducer. During the running-in trial operation, it should run at full speed in forwarding and reverse directions, and it can be confirmed that there is no strong noise, knocking and periodic noise during gear operation, oil temperature and bearing heating not exceeding 80 degrees, and no oil leakage at the seal and flange joint 1. The contact mark is not less than the specified standard.

After the running-in trial operation is completed, the lubricating oil in the box should be completely dumped and thoroughly washed with kerosene, and no debris such as abrasive debris can be left in the gearbox. After that, new lubricant can be injected and run for a period of time so that all parts in the tank is covered with lubricant.

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