CPCD5A Ⅱ Z-type forklift, in use there Guadang occur when a strong impact on the phenomenon of abnormal sound. As the car configuration is fixed axis hydraulic shift transmission (truck accessories) and forward and in reverse gear when the gear are the impact of the phenomenon. Therefore, we first suspected to be caused by main gear box or differential Songkuang.

Remove the main gear shaft by hand rotate the input shaft, found that nearly 30 ° rotation of the free space, so the judge is the main gear backlash is too large. Remove the main gear, measured obtaining the backlash of 0.65mm (standard value of 0.30-0.50mm). Adjust the bevel gear position, so that the bevel gear meshing with the active clearance of 0.35mm. Re-assembly after the test machine, the gear was still hanging there Guadang impact of the phenomenon and abnormal sound, than the original level only slightly reduced, but the fault remains.

To this end, again, remove the drive shaft (forklift parts), so that the transmission is in no-load state, start the engine, repeat Guadang, back gear, lifting gear testing and found that abnormal sound generated Guadang moments still exist, and there are more transmission significant vibration; check the transmission of the bearing bolts, not loose. Accordingly, the phenomenon to determine the fault should be within the transmission. Remove the transmission disintegration, cleaning, inspection, found the reverse gear and forward gear clutch master, slave axis tapered roller bearings loose; by shimming the bearing to the appropriate increase or decrease in the gap, and re-assembled the machine, hanging block the impact of the phenomenon and generate abnormal sound somewhat weakened, but the symptoms remain.

After the detailed examination also failed to find the root cause of this type of forklift you are (truck accessories) on the design or manufacture of a flaw it? So, and got the same type of forklift production plant, was Guadang, block of the block and back down the road test, and found that there were slight Guadang impact of the phenomenon, but different severity. Therefore, to find the cause of failure should focus on the transmission of torque control part. Transmission access to the machine control schematics and parts Atlas know, the clutch piston back to its position is achieved by a spring preload, and therefore, in Guadang the moment, the main clutch pressure control fluid flow may be excessive presence of situation, which quickly overcome the spring preload, making the active tablets and daub driven piece together too quickly and produce gear impact, as the main friction clutch control pedal too fast and loose the impact of the same. To test this idea, the need to do some of its hydraulic control line transformation, in between the clutch piston valve in series with an adjustable throttle, to control its flow, so that it can achieve the purpose of bonding smooth.

After the transformation, start the engine, do Guadang, back gear, lifting gear to test, adjust the throttle on the car, the impact of failure Guadang excluded. If there is no throttle opening is too large to achieve the transformation objectives; if the throttle opening is too small, the impact of failure, although Guadang can be resolved, but there will be driving a new weakness and slipping clutch problem. Throttle adjustments to idle speed when the engine block just hanging Ⅰ can walk better. At this point only to find the root cause is the clutch (forklift parts) active tablets and film bonding driven too fast and had a shock, and because the main gear box of the main, driven gear meshing gap is too large and all loose gear clutch bearing the impact of increased Guadang phenomenon.