How to properly connect the hydromotor?

The hydromotor works with other elements of the hydraulic system, therefore its correct assembly is important for the entire hydraulic system to work without failure. You have probably wondered more than once how to connect a hydromotor. When undertaking the self-assembly of a hydromotor, you should pay attention to several important issues.

Oil

It is very important to make sure that the oil in the machine is not contaminated e.g. by a previous hydraulic system failure. Once we are sure that the hoses and the entire hydraulic system are free of contamination, we can begin identifying the hydraulic hoses that connect to the hydromotor.

Connecting the hoses

Correct connection of the hydraulic hoses is by far the most important element in the assembly of a hydraulic motor. First, clean them thoroughly, then identify the supply and return hoses. Often we are also dealing with the fourth hose – responsible for the second gear.

Supply hoses are usually the thickest, so they are the easiest to recognize. Thanks to them, the hydromotor can move left or right. After connecting them we can put them in the bucket and start the machine, then engage the second gear. The hose from which the oil starts to leak will be the hose responsible for the second gear. And the second one – the return pipe.

In some cases, there is also a separate connection of the brake in the reduction gear. This wire is usually the smallest and when the gearbox is started, it will leak oil, so recognizing it shouldn’t be a problem.

What can be the consequences of incorrect hoses connection?

If you mix up the return and second gear hoses, the hydraulic motor can malfunction. In this case, the excess oil does not enter the reservoir and the pressure in the engine suddenly rises. If the excavator is operated under such conditions, the entire hydraulic motor system fails. So let’s double-check if the wires are properly connected to the engine. It is also worth asking the seller how to connect a hydromotor.

Sources:

https://archiwum.e-maszbud.pl/Prawidlowe_podlaczenie_hydromotoru._Poradnik_e-maszbud.pl
https://www.ketral.pl/pl/tagi/podlaczenie-silnika-hydraulicznego/podlaczenia-hydromotoru/67-0/