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Blowing hydraulic hose solution


john p
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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

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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.

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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.

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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)?

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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
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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

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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. 

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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
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