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MA45W/GS4 series of swing reducer is composed of swash plate operated piston motor and secondary planetary reducer. The motor covers safety relief valve, oil compensating valve, anti-reversing valve and internal mechanic parking brake. With security and good performance, it is mainly used in swing driving device of 8-10 hydraulic excavators.


Speed ratio20
Output torque4kN·m

Auxiliary return structure with cone cylinder pressing plate is adopted, which is featured with compact structure, high power-weight ratio and strong anti-pollution ability etc. The integrated design of the control valve realized the control function such as constant power, pressure cut-off, constant pressure, constant flow and load sensitive etc.

Rated Revolving speed2350/rmin
Pressure rating35Mpa


1. CE certification
2. ISO9001:2000
3. Brass impeller, carbon steel motor shaft, with thermal protecton inside.




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Q:Engine oil pump is blocked when the chain would ring
Hello, not only will sound, and other components will ring, the oil pump blocked, the oil lamp will be lit, not recommended to travel as soon as possible to the professional maintenance factory inspection, I hope my answer will help you
Q:The oil pump is coming up. Why is the oil lamp still on?
Check that the oil pressure sensor is in good condition and that it is generally damaged by the sensor
Q:How can Honda know when the pump is broken?
Hello, use the oil pressure gauge to measure the oil pressure
Q:What is the effect of excessive oil on the oil pump?
The oil pump doesn't work, but it has an impact on the engine. It makes the engine weak and has a lot of carbon for a long time. Don't ask how I know it. It's still in the car.
Q:Why does the oil pump have a timing mark?
Because the oil pump is not in each period of time in the injection, there is pressure, fuel injection.The effect of the oil pump is to press the engine oil to a certain pressure and force it to the surface of each part of the engine. The structure of oil pump can be divided into two types: gear type and rotor type. Gear type oil pump is divided into internal gear type and external gear wheel type, generally referred to as gear pump.
Q:How tight is the screw for the car engine oil pump?
There is a kilo on the general screw.
Q:Automobile oil pump fault
Such a problem can arise. The oil pressure is too high, and the oil filter is opened by "drum". The reason is that the oil pump pressure limiting valve [pressure relief valve], resulting in a failure, can not normally open at high pressure caused by pressure relief
Q:How do I see the motorcycle's oil pump is broken? Two red
Look at the smoke in the muffler knew no oil pump is not good.
Q:A single cylinder diesel engine oil indicator does not come up
The only reason the indicator does not come is that the oil pressure of the indicator is not enough. According to this principle, the reasons for insufficient oil pressure are eliminated one by one. It should be noted that the replacement of new parts may not necessarily be good. As long as the oil pressure is not enough, or the oil pump problem, or the problem of oil, or that there is a certain place of normal leakage of oil, causing the arrival indicator oil pressure is small.First make sure the oil pump, the method is very simple, to another machine try glance. When installing the oil pump, be sure to pay attention to the leak. Check whether the oil is fake and shoddy. By the way, check the indicator and you'd better change it to another machine. If the above is no problem, you can basically determine the normal leakage of oil. For many reasons the oil leakage is very complex, with the main bearing and the crankshaft, the new fit is not necessarily good, with the clearance of additional oil, there is the crankshaft oil plug, whether tightening. As long as you check the oil path carefully, you will find the cause of insufficient pressure.
Q:What is the function of the oil pump?
Beat the oil onto the machine that needs lubrication

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