Blowing hydraulic hose solution

[john p]

I’m upgrading my mewp, the one I’m interested in keeps blowing the same hose, the mewp has been fitted to a leyland dad 4x4 with a big hydraulic pump, is it likely to be too big a pump or a knackered relief valve? If it’s the pump I’m assuming you could fit a flow restrictor? Thoughts please

[openspaceman]

1 hour ago, john p said:

 

I’m upgrading my mewp, the one I’m interested in keeps blowing the same hose, the mewp has been fitted to a leyland dad 4x4 with a big hydraulic pump, is it likely to be too big a pump or a knackered relief valve? If it’s the pump I’m assuming you could fit a flow restrictor? Thoughts please

 

If it's bursting when  not damaged it's over pressure. Either the pressure relief is set too high or it or pipework too small.

[john p]

Is it easy enough to adjust the pressure relief? Or would it be better to fit a new one somewhere in the system? The pipes off the pump are massive going into what looks looks like 3/4”

[john p]

I can’t change pipes because the winch is massive and needs the flow

[Sheepy]

Hard to say without knowing more, You could look a sticking a flow divider in, 1 way valve, pressure relief valve set to what the mewp will stand, just be careful you don’t end up cooking your oil. Might be aswell to have a second pump for mewp sharing same tank, suppose it depends on budget and how much experimenting you want to do.

[Craig.]

The pressure relief valve is usually on the valve block.

How big is the pipe that keeps blowing? Assuming the pressure was set OK, and it a biggish pipe, may be someone's replaced it on the cheap in the past with a 1 or 2 wire hose, and it should of been multi spiral/wire hose, and the following replacement hoses have been made the same (wrong type)?

[john p]

The pressure relief valve is usually on the valve block.
How big is the pipe that keeps blowing? Assuming the pressure was set OK, and it a biggish pipe, may be someone's replaced it on the cheap in the past with a 1 or 2 wire hose, and it should of been multi spiral/wire hose, and the following replacement hoses have been made the same (wrong type)?

It’s blown twice in same place, proper hose

[dig-dug-dan]

2 hours ago, Craig. said:

The pressure relief valve is usually on the valve block.

How big is the pipe that keeps blowing? Assuming the pressure was set OK, and it a biggish pipe, may be someone's replaced it on the cheap in the past with a 1 or 2 wire hose, and it should of been multi spiral/wire hose, and the following replacement hoses have been made the same (wrong type)?

As above. Do you know for definate the hose has the correct burst strength? If i take a busted hose to my supploer, he makes one up to the same spec, so if wrong before, its wrong again

[spuddog0507]

2 hours ago, john p said:

It’s blown twice in same place, proper hose

is the pump a gear pump or piston pump ? 2 very different pumps with different working pressures and needing different type of hose have a look at the working pressure on the other hoses it will be stamped on. 

[john p]

is the pump a gear pump or piston pump ? 2 very different pumps with different working pressures and needing different type of hose have a look at the working pressure on the other hoses it will be stamped on. 

Not sure, runs off the gear box so assume it’s a gear pump