1. First gear and reverse gear are normal, and second gear has no driving force

检查变速手柄（skid steer loader）是否到位，如不到位应重新调整。然后检查变速压力表在二挡位置是否降压， 如果降压，检查变速箱的8字形端盖的外围是否有压力油流出，如有渗漏现象，可以紧固周围的 螺栓。上述方法仍不能排除故障，则把8字形端盖卸下，更换 o型密封圈和纸垫。此时如果没有压力油溢出，则证明变速箱内的二挡构件有问题， 把二挡构件拆下。检查二挡外部的油封是否损坏，然后再分解二挡构件，取出活塞，检查活 塞环、油封环和摩擦片是否损伤。检查二挡油缸内的导向销是否脱落，若导向销脱落，二挡的压 力油由此处大量流出，造成二挡压力降低而不能行驶。针对降压的原因，更换密封件或修、换零部件。

First, check whether the shift lever loader is in place. If not, readjust it. Then check whether the pressure of the transmission pressure gauge is reduced at the second gear position. If so, check whether there is pressure oil flowing out of the periphery of the 8-shaped end cover of the transmission. If there is leakage, fasten the surrounding bolts. If the above methods still cannot eliminate the fault, remove the 8-shaped end cover and replace the o-shaped seal ring and paper gasket. At this time, if there is no pressure oil overflow, it indicates that the second gear component in the gearbox is faulty. Remove the second gear component. First, check whether the oil seal outside the second gear is damaged, then disassemble the second gear components, take out the piston, and check whether the piston ring, oil seal ring and friction plate are damaged. Finally, check whether the guide pin in the second gear oil cylinder falls off. If the guide pin falls off, a large amount of pressure oil in the second gear will flow out from here, causing the pressure in the second gear to decrease and the vehicle cannot be driven. For the reason of pressure reduction, replace the seals or repair or replace the parts.

2、变速压力、动臂、转斗和转向都正常，但装载机仍不能前进与后退

2. The speed change pressure, boom, bucket and steering are normal, but the loader still cannot move forward or backward

检查变速箱内是否缺油和进油管路是否堵塞，然后检查变速箱油底壳(electrical motor)和变矩器滤清器。如果发现金属碎块等物，则可以肯定变速箱内的大超 越离合器内零件有损坏。如果发现变速箱油底壳和变矩器滤清器内有铝屑出现，则可以肯定变矩器里 面零件损坏。这时拆卸检查变速箱和变矩器，进行修理和更换所损坏的零件。排除上述原因，车 仍不能行走，就可以确定是变速箱内的二挡构件周围的螺栓被切断，或中间轴输出齿轮脱落，而使动 力无法输出。排除方法 ：可将变速箱的8字形端盖拆开，取出二挡构件，更换切断的螺栓即可。此螺 栓材料是40Cr，进行调质处理，决不可用普通螺栓代替。

First, check whether the transmission is short of oil and whether the oil inlet pipe is blocked, and then check the transmission oil pan (electrical motor) and torque converter filter. If metal fragments and other objects are found, it can be confirmed that the parts in the large overrunning clutch in the gearbox are damaged. If aluminum chips are found in the transmission oil pan and torque converter filter, it is certain that the parts inside the torque converter are damaged. At this time, disassemble and check the transmission and torque converter, repair and replace the damaged parts. After the above reasons are eliminated, if the car still cannot move, it can be determined that the bolts around the second gear component in the gearbox are cut off, or the output gear of the intermediate shaft falls off, which makes the power output impossible. Troubleshooting: The 8-shaped end cover of the gearbox can be disassembled, the second gear component can be taken out, and the cut bolt can be replaced. The bolt material is 40Cr, which shall be quenched and tempered and shall not be replaced by ordinary bolts.

3、一挡、倒挡无力，二挡行驶缓慢

3. Weak in first gear and reverse gear, slow in second gear

检查变速压力表所指示的压力是否正常。如果压力达到108KPa，加大油门查看压力表指针 是否摆动；如果剧烈摆动，就证明变速箱里的透平油太脏或油量不足，应查看变速箱油位检油塞是否 能流出透平油。如果有油流出， 则故障是因油太脏所致，应清洗变速箱和滤清器，然后更换新油；如 果油量正常，变速压力表指示正常，则故障可能是变速箱（conveyor belt）和变矩器中间的输入二级齿轮断裂，使变矩 器二级齿轮的动力不能输出，只有一级齿轮的动力可以输出。排除的方法：拆除变矩器和变速箱的连接，更换损坏的输入二级齿轮。

First, check whether the pressure indicated by the variable speed pressure gauge is normal. If the pressure reaches 108KPa, increase the accelerator to check whether the pointer of the pressure gauge swings; If it swings violently, it indicates that the turbine oil in the gearbox is too dirty or insufficient. Check whether the oil level inspection plug of the gearbox can flow out of the turbine oil. If oil flows out, the fault is caused by dirty oil. Clean the transmission and filter, and then replace with new oil; If the oil volume is normal and the indication of the transmission pressure gauge is normal, the fault may be that the input secondary gear between the transmission belt and the torque converter is broken, making the power of the torque converter secondary gear unable to output, and only the power of the primary gear can be output. Troubleshooting: Remove the connection between the torque converter and the transmission, and replace the damaged input secondary gear.

4、一挡驱动无力，其它挡位正常

4. First gear drive is weak, other gears are normal

检查变速表的压力，是否在一挡位置有降压的现象。如果压力在98.1KPa以下，一挡驱动必 然无力。造成这些现象的原因是一挡活塞环擦伤或磨损过大，使压力油泄露过多，从而使一挡驱动无 力；另外，还可能是因一挡油缸外部的o型密封圈损坏，造成大量的压力油渗漏；如果故障是上述原 因造成的，把变速箱吊出，拆开更换损伤的活塞环和密封圈；如果变速压力表在一挡位置没有降 压的情况，很可能是变速拉杆没有调整到位，使一挡驱动无力，应重新调整变速拉杆，使它达到规定 位置。

First, check the pressure of the transmission gauge to see if there is pressure drop at the first gear. If the pressure is below 98.1KPa, the first gear drive must be weak. The reason for these phenomena is that the first gear piston ring is scratched or worn too much, which makes the pressure oil leak too much, thus making the first gear drive weak; In addition, a large amount of pressure oil leakage may be caused by the damage of the O-ring outside the first gear oil cylinder; If the fault is caused by the above reasons, lift out the gearbox, disassemble and replace the damaged piston ring and seal ring; If the pressure of the shift pressure gauge is not reduced at the first gear position, it is likely that the shift lever is not adjusted in place, making the first gear drive weak. The shift lever should be readjusted to make it reach the specified position.

5、发动机工作正常，装载机不能行走

5. The engine works normally, and the loader cannot walk

检查变速箱的油量限位阀和变速压力表。如发现缺少变速变矩油应加添新油。但不宜添过 多，否则会引起变速变箱发热，一般添限位阀流出油来为止。然后检查动臂能否起落和有无转向， 如果动臂能起落也可转向，而装载机无法行走，这是因为变速泵的损坏缺油而造成的。动臂不能起落 也无法转向，装载机不能行走，这种情况多是变矩器(meat machine)的钢板连接被螺栓剪断、或者是弹性板破裂而造 成的。把柴油机和变速箱一起吊出，然后拆除变矩器的柴油机的连接部分，查明损坏部位，更换 或修复损坏零件。

First, check the oil volume limit valve and the transmission pressure gauge of the transmission. If the transmission torque converter oil is found to be lacking, add new oil. However, it is not advisable to add too much, otherwise it will cause the gearbox to heat up. Generally, it is added until the oil flows out of the limit valve. Then check whether the boom can rise and fall and whether there is steering. If the boom can rise and fall, it can also turn, but the loader cannot walk. This is due to the damage of the variable speed pump and lack of oil. The boom can neither rise or fall nor turn, and the loader can not walk. This is mostly caused by the steel plate connection of the torque converter being sheared by bolts, or the elastic plate being cracked. Lift out the diesel engine and gearbox together, then remove the connecting part of the diesel engine of the torque converter, find out the damaged parts, and replace or repair the damaged parts.

6、只能前进不能后退

6. Only forward, not backward

检查变速压力表所指示的压力是否正常。如果挂倒挡压力降低，就证明倒挡部分渗漏油太 多，把变速箱吊出，全部拆开检查。取出倒挡活塞，更换活塞环，检查摩擦片损坏的情况，可把 磨损较严重的摩擦片换掉，重新调整倒挡间隙1.6-2.6mm；如果倒挡不降压，就证明前进挡有卡 死的现象。使倒挡摩擦片打滑而造成倒挡不能行走，把变速箱吊出拆开，检查一挡内齿圈上面的隔离环是否断裂。因断片能把一挡摩擦片卡死，使倒挡摩擦片打滑而不起作用，造成只能前 进不能后退。可把隔离环取出，更换新的即可排除。

First, check whether the pressure indicated by the variable speed pressure gauge is normal. If the reverse gear pressure decreases, it shows that there is too much oil leakage in the reverse gear. Lift out the gearbox and disassemble it for inspection. Take out the reverse piston, replace the piston ring, check the damage of the friction plate, replace the friction plate with severe wear, and readjust the reverse clearance to 1.6-2.6mm; If the reverse gear does not depressurize, it shows that the forward gear is stuck. If the reverse gear cannot move due to slipping of the reverse gear friction plate, lift the gearbox out and disassemble it, and check whether the isolating ring on the first gear inner ring gear is broken. Because the fragment can lock the first gear friction plate, the reverse gear friction plate will slip and will not work, resulting in only moving forward and not moving backward. Take out the isolating ring and replace it with a new one to eliminate it.

7、驱动无力，时走时停

7. The drive is weak and stops when it moves

(1) 检查变速箱旁边的油量限位阀，缺油时应加补新油。

(1) Check the oil volume limit valve beside the gearbox, and add new oil in case of oil shortage.

(2) 如果油量正常，则应检查变速压力表。若压力表摆动剧烈，表明供油不足，可依次检查进油  管路是否堵塞，胶管内层是否因老化而起泡，变矩器滤清器是否清洁，滤清器的滤芯是否清洁。如果 是上述原因，清洗并用压缩空气（compact loader）多次冲洗堵塞的导管和滤芯，直畅通方可使用。起泡的胶管则要更换。

(2) If the oil quantity is normal, check the variable speed pressure gauge. If the pressure gauge swings violently, which indicates insufficient oil supply, check whether the oil inlet pipe is blocked, whether the inner layer of the rubber tube is bubbling due to aging, whether the torque converter filter is clean, and whether the filter element of the filter is clean. In case of the above reasons, clean and flush the blocked guide tube and filter element with compressed air for many times until they are unblocked. Replace the blistering rubber hose.

(3)观察滤网上有无金属块和铝屑等物，若有则表明变矩器和变速箱内有损坏的零件，分解检查，更换损坏的零件。

(3) Observe whether there are metal blocks, aluminum chips and other objects on the filter screen. If there are any, it indicates that there are damaged parts in the torque converter and transmission case. Disassemble and check, and replace the damaged parts.

8、变速器压力正常，一挡和倒挡都不能行走，只有二挡可以正常行驶

8. The transmission pressure is normal. I can't drive in first gear or reverse gear. I can only drive in second gear

造成这种故障的原因多数是因不踏制动踏板而直接换挡，把变速箱里的一、倒挡连接盘扭断，使动力传递不出来。而二挡是直接和太阳轮内花键连接，动力可直接传出，所以二挡可以行驶。

The reason for this kind of failure is that the gear is directly shifted without stepping on the brake pedal, which breaks the first and reverse gear connecting plates in the gearbox, so that power cannot be transmitted. The second gear is directly connected with the spline inside the sun wheel, so the power can be transmitted directly, so the second gear can be driven.

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