1, one block, reverse gear normal, two block no driving force

First check the steer loader (skid) is in place, if not in place should be re adjusted. Then check the variable pressure gauge in the two block position whether the buck, if the buck, you must check the transmission of the 8 - shaped end cover of the periphery of the pressure oil outflow, if there is leakage phenomenon, you can tighten the bolt around. The above method still can not eliminate the faults, we must put the figure 8 cover removed, replace the O-ring and paper pad. At this point, if there is no pressure oil spill, it is proved that the two gear box has a problem, you must remove the two components. First check the oil seal outside the two block is damaged, and then break the two block component, remove the piston, check the piston ring, oil seal ring and the friction piece is damaged. Finally check the guide pin in the two block cylinder is off, if the guide pin off, the two block of the pressure oil from here a large number of outflow, resulting in two block pressure to reduce and can not travel. For the reasons for the buck, replace the seal or repair, change parts.

2, variable speed pressure, boom, bucket and steering are normal, but the loader is still unable to move forward and backward

First check the transmission box is short of oil and oil into the pipeline is blocked, and then check the transmission oil sump (motor electrical) and torque converter filter. If it is found that the metal fragments and other objects, it can be sure the gear box clutch parts were damaged in the Da Chao. If it is found that there are aluminum chips in the gearbox oil pan and the converter filter, it can be sure that the parts of the converter can be damaged. At this time, we must remove the transmission and torque converter, to repair and replace the damaged parts. Excluding the above reasons, cars are still unable to walk, we can determine the is the gearbox. Second gear component around the bolt is cut off, or intermediate output gear shedding, and make dynamic force can be output. Exclusion method: the transmission of the 8 end cover can be opened, remove the two block, the replacement of the bolt can be cut off. This bolt material is 40Cr, must be quenched and tempered, and must not be replaced by ordinary bolts.

3, one block, reverse gear weakness, two slow moving

First check whether the pressure is normal or not indicated by the variable pressure gauge. If the pressure is reached 108KPa and gunned the engine and check the pressure gauge pointer is swinging; if swing violently, as evidenced by the lack of the turbine oil in the gearbox is too dirty or oil, should check gearbox oil level in oil inspection plug whether outflow of turbine oil. If the oil outflow, the fault is caused by dirty oil, cleaning gear box and filter, and the replacement of the new oil; oil fruit, such as normal and variable pressure table indicating normal, the fault may be gearbox (conveyor belt and in the middle of the converter input gear fault, the converter secondary gear dynamics cannot output, only a gear of the power can be output. Removal of the method: the removal of torque converter and the transmission of the connection, the replacement of damaged input two gear.

4, a block driver weakness, other retaining normal

First check the pressure of the variable speed table, whether in a block position has the phenomenon of blood pressure. If the pressure is below 98.1KPa, the driving force will be weak. Caused by reason of these phenomena is a block abrasion of piston ring or excessive wear, the pressure oil leak too much, so that a block without driving force. In addition, it is possible for a block cylinder external O-ring damage, resulting in a large amount of leakage of pressure oil; if the fault is the original caused to the gearbox hanging out and open repair by replacement of the piston ring and a sealing ring; if the variable pressure table in a blocking position, no pressure, is likely to be transmission rod no adjustment in place, make a block unable to drive, should be re adjust the transmission rod, make it up to the required position.

5, the engine is working properly, the loader can not walk

First check the gear box oil quantity limit valve and variable speed pressure gauge. If the lack of speed and torque of oil should add oil. But should not add too much, otherwise it will cause the transmission gearbox fever, generally add to the limit valve to the outflow of oil. Then check the boom can be landing and whether there is no turning, if the boom can be turned, and the loader can not walk, this is due to the damage caused by the transmission pump. Boom not landing also can not be turned, the loader cannot walk, this is variable converter (meat machine is connected to the plate bolt cut, or elastic plate rupture caused. The diesel engine and the gearbox must be hoisted out, and then the connecting part of the diesel engine of the torque converter is removed to find out the damaged parts and replace or repair the damaged parts.

6, only forward can not be backward

First check whether the pressure is normal or not indicated by the variable pressure gauge. If you hang down the pressure to reduce, it is proved that the reverse part of the leakage of oil too much, you must put the gear box hanging out, all open check. Remove reverse gear piston, piston ring replacement, check the friction piece is damaged, wear serious friction plate replaced, re adjust the reverse gear gap to 1.6-2.6mm; if the reverse gear doesn't buck, is that forward gear clamping phenomenon. The reverse gear can not walk, the transmission must be lifted out of the gear box, check the ring in the ring of the ring is broken. Due to a friction block fragment stuck, the reverse friction slip and no effect, only the cause can not retreat. Can remove the isolated ring, replace the new can be ruled out.

7, driven weakness, when the time to stop

(1) check the gear box next to the amount of oil limit valve, lack of oil should be added to fill the new oil.

(2) if the oil is normal, the variable pressure gauge should be checked. If the pressure table swings violently, indicates that the fuel supply is insufficient, can be checked in turn into the oil pipeline is blocked, the inner layer of the rubber tube is due to aging and foaming, the torque converter filter is clean, the filter element is clean. If it is the above reasons, cleaning and using compressed air (loader compact) repeatedly wash the plug of the catheter and filter, until the smooth side can be used. Foam hose to be replaced.

(3) to observe the filter net with no metal block and aluminum scrap, etc., if there is a change in the torque converter and the gearbox has damaged parts, must be broken down to check, replace the damaged parts.

8, transmission pressure is normal, can not walk a block and reverse gear, only two of the block can be normal travel

Most of the reasons for this failure is due to set foot on the brake pedal and direct shift, the gearbox, reverse gear connecting disc wring, and power transfer out. The two block is the direct and the sun wheel spline connection, the power can be directly heard, so the two block can travel.

--- from 21-sun loader Forum

Shandong Shan Yu Heavy Machinery Co., Ltd.