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Common Maintenance Cases of Crane Malfunctions - Difficulty Shifting Gearboxes

Fault phenomenon: Difficulty shifting the gearboxFault description: When shifting gears, the gear cannot be smoothly engaged, and gear collision noise often occurs.

Fault cause analysis:1. The variable speed fork shaft is bent and deformed;2. The self-locking or interlocking steel ring is broken, rough and stuck;3. Improper adjustment or damage to the transmission connecting rod;4. The synchronizer is worn out or defective;5. The transmission shaft is bent or deformed, or the splines are damaged.6. Check if the clearance between the mating surfaces of the joint sleeve is too large and if there is any damage.7. In addition to transmission faults, incomplete clutch disengagement and inconsistent gear oil specifications can also cause difficulty in shifting gears.

Troubleshooting steps and methods:

1. Check whether the transmission fork is bent or deformed, whether the self-locking and interlocking steel balls are damaged, and whether the spring is hard.2. Check if the control mechanism is in the appropriate position, deformed, or stuck.3. If the above inspection is normal, the synchronizer should be checked for damage, mainly checking whether the synchronizer is loose, whether the inner conical thread of the synchronizer cone ring is worn, whether the slider is worn, and whether the spring elasticity is too soft.If it is a joint sleeve, it is necessary to check whether the fit of the joint sleeve is normal, whether there are cracks or tooth problems.5. If the synchronizer and coupling sleeve are normal, it is necessary to further check whether the first shaft of the transmission is bent and whether its splines are worn.