Did the forklift slip away when it was in gear? Remember to eliminate it step by step!
Update:Jan 04,2022
Summary:The troubleshooting method of the forklift gear shifting fault: the forklift will have a strong impact and abnormal noise when it is shifted in use. I...
The troubleshooting method of the forklift gear shifting fault: the forklift will have a strong impact and abnormal noise when it is shifted in use. In most cases, it may be due to the configuration of a hydraulic shift fixed-shaft variable reducer or a loose differential.The drive shaft of the main reducer is rotated by hand. If there is a free rotation gap, it is judged that the gearing gap of the main reducer is too large. Remove the main reducer and measure the gap distance (standard value is 0.30-0.50mm). Adjust the position of the bevel gear so that the tooth clearance with the driving bevel gear is within the range of the standard clearance value. After reassembling the test machine, if there is still gear shock and abnormal noise when in gear, the degree is only slightly reduced than the original, but the fault remains.At this time, the drive shaft can be removed again to make the transmission in an idling state. Start the engine, repeat the gear shift, push gear, and up/down gear tests. If it is found that the abnormal noise generated at the moment of gear shifting still exists, and the transmission has obvious vibration. You can check whether the supporting and fixing bolts of the transmission are loose.If the bolts are tightened, it can be judged that the fault should be inside the transmission. The transmission can be disassembled, cleaned, inspected, and the tapered roller bearings of the main and driven shafts of the reverse gear and forward gear clutches can be checked for looseness. If there is any looseness, adjust the bearing to the proper clearance by adding or reducing the gasket. After adjusting, reassemble the test machine. Although the phenomenon of gear shock and abnormal noise has been reduced, the failure phenomenon still exists.Therefore, the search for the cause of the failure should be placed in the hydraulic control part of the transmission. Because the piston return of the clutch is achieved by the preload of the spring. Therefore, at the moment when gear is engaged, the main clutch may have excessive pressure control oil flow, so it quickly overcomes the spring preload force, so that the driving plate and the driven plate are engaged too fast and the gear is shocked.In order to completely solve this fault, it is necessary to make certain modifications to its hydraulic control pipeline. An adjustable flow valve is connected in series between the reversing valve and each clutch piston to control the flow rate so that it can achieve the purpose of smooth engagement.
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