Hi,
We have a tiny hydraulic pump mount in timing gear section. It was working good, suddenly, the pressure hose which goes to valve block, keep bursting. We have change 3 times in a month.
It also has a problem of oneway cylinder not raising once the oil heated.
Now Oil tank getting very heat within 5 minitutes.
It has hydrostatic transmission also, and the pick is not there,even at engine's high speed, it is moving fast...now only happening.
we multiple issues it started from the oneway cylinder, now the rest coming up.
We recently changed the filter didn't help.
We changed oil didn't help.

Please need some advice.

Thanks

Nathan,

-Hydraulic hoses are designed for 4 times the pressure that its rated for. In the sense if the hose is rated for 3000 PSI then it would burst at 12000 PSI. In your case you probably have blocked your hose completely to achieve the bursting pressure. Is it a leak or burst? Do you have any pictures?
- Was the cylinder lowering? What kind of pilot controls do you have to shift from neutral to lower or raise?
- Can you pls provide more detail on "Oil tank getting very heat within 5 mins" What temperatures?
- I didn't understand your hydrostatic transmission issue. Can you pls elaborate.

I'm sure you have checked that the hose you are using is what you think it is.

Anyway, if it were my trouble shooting call I would install a gauge with a Check Valve, FREE FLOW from the pump in front of the Gauge Inlet to trap the maximum pressure the circuit is experirncing.

Then, If it is Pressure Spikes causing the problem an UP TO DATE circuit schematic would be required to give any answer to why you are seeing the hose failures from excess pressure.

This is pretty much just a guess, yes yes I know, Your relief valve is either faulty, cavity washed out, or intermitantly stuck open because of contamination. This caused your cylinder issue as your losing oil across the relief and generating your heat problem. Someone figured they could fix said cylinder problem by cranking up the relief valve. Now your blowing hoses up. Is your cylinder problem intermittant?