1.The first gear and reverse gear function normally, but there is a lack of driving force in the second gear.
First check whether the skid steer loader is in place. If not, readjust it accordingly. Subsequently, examine whether there is a decrease in pressure on the pressure gauge when in the second gear position. If the pressure is reduced, inspect whether there is oil leakage from the exterior of the gearbox's 8-shaped end cap. In case of leakage, tighten the surrounding bolts. If this doesn't resolve the issue, proceed to remove the 8-shaped end cap and replace the O-ring and paper cushion. If there is no oil spill at this point, it indicates a problem with the second gear component inside the gearbox, requiring the removal and replacement of the second gear component. Initiate an inspection by verifying the condition of the oil seal outside the second gear. Subsequently, disassemble the second gear components, extract the piston, and scrutinize the piston ring, oil seal ring, and friction disc for any signs of damage. Conclusively, examine whether the guide pin in the second gear cylinder is securely in place. If the guide pin is dislodged, it can lead to a substantial outflow of pressure oil in the second gear, resulting in a diminished pressure and inability to drive. Addressing the pressure reduction entails the replacement of seals, repair, or the replacement of affected parts and components.
2.The variable-speed pressure, boom, bucket, and steering functions are all operating normally; however, the loader still cannot move forward or backward.
First, exam the gearbox for potential oil shortages and inspect the oil intake pipeline for any blockages. Second, assess the condition of the electric motor and inspect the torque converter filter. If you discover metal fragments or other foreign objects, it indicates damage to the components within the large overrunning clutch in the gearbox. If you find scraps in the gearbox's oil pan and the torque converter's filter, it confirms a damage to the internal parts of the torque converter. In such a situation, it is imperative to disassemble and inspect both the gearbox and the torque converter, and subsequently, undertake the necessary repairs and replace the damaged components. If the issues mentioned earlier have been ruled out and the vehicle remains unable to move, it suggests the possibility of a severed bolt surrounding the second gear component within the gearbox or a detachment of the output gear from the intermediate shaft, which would impede the power output.
Exclusion method: Using the process of elimination, disassemble the 8-shaped end cover of the gearbox to access the second gear component. Remove the damaged bolt and replace it with a new one made of 40Cr material. Ensure that the replacement bolt undergoes proper tempering and treatment, as it cannot be substituted with ordinary bolts.
3.The performance of the first gear and reverse gear is suboptimal, while the second gear demonstrates a slow response.
First verify the pressure indicated on the variable speed pressure gauge to ensure it falls within the normal range. If the pressure on the variable speed pressure gauge reaches 108 KPa, increase the throttle and observe the pressure gauge pointer for any significant oscillations. If there is vigorous swinging, it indicates that the turbine oil in the gearbox is either excessively dirty or insufficient. In such a case, inspect whether the oil level check plug in the gearbox allows turbine oil to flow out. If oil is present, the issue is likely due to dirty oil, necessitating a thorough cleaning of the gearbox and filter, followed by the replacement of the oil. However, if the oil quantity is normal and the pressure gauge shows a normal reading, the problem may stem from a breakage in the input second gear between the transmission and the torque converter, which impedes the transmission of power in the second gear of the torque converter. Out, only the power of the first gear can be output. Removal method: Remove the connection between the torque converter and the gearbox, and replace the damaged input secondary gear.
4.The first gear lacks power while the other gears function normally.
First, examine the transmission pressure to identify any pressure reduction in the first gear position. If the pressure falls below 98.1 KPa, the first gear drive will inevitably experience a loss of power. This occurrence can be attributed to the significant scratch or abrasion of the piston ring within the first gear, leading to the leakage of pressure oil and consequently rendering the first gear powerless. Additionally, the issue may arise from damage to the O-ring located outside the cylinder of the first gear, causing substantial leakage of pressure oil. If the malfunction is attributed to the aforementioned causes, it is imperative to lift the gearbox out. If the pressure gauge does not decrease in the first gear position, it is a likelihood that the speed change pull rod is not properly adjusted, resulting in a lack of power in the first gear drive. In such cases, it is advisable to readjust the speed change pull rod to ensure it reaches the required position.
5.The engine is functioning properly, but the loader is unable to move.
First, check the oil limit valve and the pressure gauge of the gearbox. If a shortage of variable speed torque oil is identified, it is advisable to add new oil. However, it is not recommended to add an excessive amount, as this could lead to overheating in the gearbox. Generally, one should wait until the limit valve is depleted of oil before adding more. Subsequently, check whether the boom can lift and rotate. If the boom is operational in lifting and rotating, but the loader is unable to move, it indicates damage to the transmission pump caused by insufficient oil. If the arm cannot lift or rotate, resulting in the loader's immobility, this situation is primarily caused by the steel plate connection of the mainframe being severed by bolts or the elastic plate breaking.
6.Move forward but not backward
First, check the normality of the pressure indicated on the variable speed pressure gauge. If the reverse gear pressure decreases, it indicates excessive oil leakage in the reverse section. In such cases, the gearbox needs to be lifted out, and a comprehensive inspection is required by dismantling all the gearboxes, which involves removing the reverse piston, replacing the piston ring, and assessing the condition of the friction disc for any damage. The worn friction discs should be replaced, and the reverse clearance needs to be readjusted to fall within the range of 1.6-2.6 mm. If the reverse pressure does not decrease, it indicates that the forward gear is stuck. If the reverse friction disc slips, preventing the movement of the reverse gear, the transmission must be hoisted and disassembled to inspect whether the isolation ring above the inner ring of the first gear is damaged. If fragments obstruct the first friction piece, it can cause the reverse friction disc to slip and render it inoperable and allow only forward movement without the ability to reverse. To address this issue, the isolation ring should be removed and replaced.
7.Driving is powerless and stops from time to time
First, check the oil limit valve beside the gearbox, and replenish with new oil if there is an oil deficiency. If the oil quantity is within normal range, it is advisable to inspect the variable speed pressure gauge. And violent oscillations on the pressure gauge suggest issues with oil supply.