Blowing hydraulic hose solution

[john p]

Don’t know why i posted that 4 times

[john p]

I’ve just looked at those dividers, cheaper than I thought! I just need to find someone who really knows their shit with hydraulic s in the s/West to come and have a look.

[openspaceman]

34 minutes ago, john p said:

Yes, that makes perfect sense, the pipes on the mewp properly jump/kick out when switched over, I suppose it’s like the m3/303/single carriage way scenario, large flow getting channeled into small pipe!

Sort of but pressure drop times flow (which is constant for any given speed) equals power and that is all going into heating the block. You need to establish what the flow is at the engine speed you want to operate the MEWP,  Run the output of the pump ( which looks a bit like a twin piston pump the way the pipes come out parallel with the axis) into a clean empty drum after a couple of seconds mark the level and start a stop watch. after 15 seconds mark the second level and stop. 4 times the volume between first and second level is the litres per minute. Run MEWP off a power pack and do the same for the power pack, that's the flow you want for the MEWP.

 

Gear pumps for the MEWP I hire are tiny and run off 5hp motors, the winch could easily need 30HP.

[john p]

Middle lever is jammed solid, I’m going to investigate, if I undo the Allen key bolt will it explode in a load of spring s and washers?

[john p]

[woody paul]

If mean the one in the middle you may do crack pipes to release pressure first and see.

On a McConnell hedge cutter I use one  leaver after time was hard to move tried everything turned out oil had leaked in to spring end of vavle making a hydraulic damper affected.

Edited September 19, 2018 by woody paul

[john p]

Also is there likely to be a relief valve in this bit? (Switches flow from winch to mewp)

[htb]

Looks like one on top right beside change lever. Is the change over lever 3 position or 2, ie service 1/ neutral/ service 2

[john p]

Looks like one on top right beside change lever. Is the change over lever 3 position or 2, ie service 1/ neutral/ service 2

2 I think

[openspaceman]

6 minutes ago, john p said:

2 I think

You've confused me and while you're not David Bailey and  that spool block's not the shrimp  it looks like a single slice spool with a  adjustable pressure relief valve to the right of the lever as htb said.  Why would it need an inlet and outlet and the two service ports if it is only a changeover switch?

 

Yes there will be springs if you take off the end cap but they tend to be only compressed if the lever is not in neutral.

 

On the three spool picture there is a metal lever to the left, this looks more like a diverter.