So after a mesh filter clean, new hydraulic filters and 15 gallons of oil - i seem to have lost lift power in the boom - its struggling to lift a yard brush over 1/2 way in the air. The other hydraulics seem normal including the bucket cylinder. Could i have a air lock in system or could i have sucked some of the watery gunk into the boom lift hydraulics ? i also notice that hydraulic oil is at the low level on the dipstick when the engine is running but immediately return to high when i switch off the engine - is this normal too? I did think all this maintenance would improve my machine but i seem to be making it worse...
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hi can anybody help - bo0th the boom and main cylinder have lost power and can only lift and tilt about 50% capacity - is it possible to get air in the system as that is what it feels like? If so how do you bleed? What else could affect both the booms arms and the main cylinder after a service ? Everything else seems ok no warning lights and goes back and forward normally ?
These systems should self bleed..... I don't know NH machines, hopefully someone with more experience will pop their nose in and help you out.hi can anybody help - bo0th the boom and main cylinder have lost power and can only lift and tilt about 50% capacity - is it possible to get air in the system as that is what it feels like? If so how do you bleed? What else could affect both the booms arms and the main cylinder after a service ? Everything else seems ok no warning lights and goes back and forward normally ?
ah thanks - it seems to be releasing the pressure and almost makes a quick air release noise and then loses pressure - so it will attempt to move the boom then make a hiss noise then the pedal will just move past that point and nothing happensThese systems should self bleed..... I don't know NH machines, hopefully someone with more experience will pop their nose in and help you out.
To bleed the air out of the system raise the boom all the way up and lower it do theis a couple of times. Then do the same on your tilt cylinder, If it is air this should clear itah thanks - it seems to be releasing the pressure and almost makes a quick air release noise and then loses pressure - so it will attempt to move the boom then make a hiss noise then the pedal will just move past that point and nothing happens
i have already tried that - boom goes up and down fine with no load on just loses power when you try to lift a load - it even struggles to lift an empty bucket? What else can i check - is it possible i havee dislodged some gunk somewhere when i was changing the hydraulic oil, i have checked the wire mesh filter at the main pick up before the pump and its clean?To bleed the air out of the system raise the boom all the way up and lower it do theis a couple of times. Then do the same on your tilt cylinder, If it is air this should clear it
I would think you need to plumb in a pressure gauge in where ever you can to see what is going on. ( near pump outlet) then move on outlet side of lifting valves. see what kind of reading you get then activate that circuit and see what goes on then.i have already tried that - boom goes up and down fine with no load on just loses power when you try to lift a load - it even struggles to lift an empty bucket? What else can i check - is it possible i havee dislodged some gunk somewhere when i was changing the hydraulic oil, i have checked the wire mesh filter at the main pick up before the pump and its clean?
its difficult to access anything and the majority of hoses are stuck on- are there any other filters i could check or pressure relief valves etc worth removing before i go doen the full strip doen route ?I would think you need to plumb in a pressure gauge in where ever you can to see what is going on. ( near pump outlet) then move on outlet side of lifting valves. see what kind of reading you get then activate that circuit and see what goes on then.
If you are sure all the air is out of thecyls then I would start with the control valve that is controlled by the foot pedals. Sounds to me like you have oil by passing inside of it. Could be you check valve or pressure relief valve stuck open or mabe the spools are not lining up like they should. When doing anything start with the easy stuff first. I have found this saves a lot of time and cussing at myself. I have one in my shop that I did not do that and crated a couple hours of extra work for me. This is my machine so no viggieits difficult to access anything and the majority of hoses are stuck on- are there any other filters i could check or pressure relief valves etc worth removing before i go doen the full strip doen route ?
One other thing. Check under your foot pedals to make sure something is not stuck under themits difficult to access anything and the majority of hoses are stuck on- are there any other filters i could check or pressure relief valves etc worth removing before i go doen the full strip doen route ?
thanks Ivan i did think check the Control valve but wasnt sure how to - is it possible to service the control valve in situ on my model it is a victor control valve with 3 caps on top ? in regards to your other question nothing stuck under the pedals - both pedals travel fully initially they start to lift then you can hear an air release then they continue to travel but obviously no pressure so dont do anythingOne other thing. Check under your foot pedals to make sure something is not stuck under them
That noise is a good sign it is bypassing inside the valve. I would remove the vale and take it appart. Lay all the parts out in the order you take them out. Once you have it out check all the spools to see that they are moving like they should. Take a light and shine in the holes for thelines and make sure the spool is centered. Whe you pluss the spool back see it it opens up the other line. It amy have a piece of dirt in it and holding the relief open. Look up the arts disgram on NH site and it shoud have a break down of your valve. If you raise the boom to do this make sure the boom lock is engaged all the way. These valve are simple to work on but do not drop the parts or scratch any part as they have very close tol on themthanks Ivan i did think check the Control valve but wasnt sure how to - is it possible to service the control valve in situ on my model it is a victor control valve with 3 caps on top ? in regards to your other question nothing stuck under the pedals - both pedals travel fully initially they start to lift then you can hear an air release then they continue to travel but obviously no pressure so dont do anything
thanks i have ordered a pressure gauge now so will check that first and report back - as both the boom and thee main cylinders arent working does that suggest any particular part ?That noise is a good sign it is bypassing inside the valve. I would remove the vale and take it appart. Lay all the parts out in the order you take them out. Once you have it out check all the spools to see that they are moving like they should. Take a light and shine in the holes for thelines and make sure the spool is centered. Whe you pluss the spool back see it it opens up the other line. It amy have a piece of dirt in it and holding the relief open. Look up the arts disgram on NH site and it shoud have a break down of your valve. If you raise the boom to do this make sure the boom lock is engaged all the way. These valve are simple to work on but do not drop the parts or scratch any part as they have very close tol on them
To me it would suggest the control valve . The pressure is set wrong on the relief valve inside it. That is what I would checkthanks i have ordered a pressure gauge now so will check that first and report back - as both the boom and thee main cylinders arent working does that suggest any particular part ?
it says in the manual the pressure relief is a cartidge type and non adjustable - also it doesnt tell you where exactly it is or what it looks like - is it possible to get it out without removing the control unit ?To me it would suggest the control valve . The pressure is set wrong on the relief valve inside it. That is what I would check
i was looking at the wrong disgram i know where it is but as its non serviceable any point taking it out?it says in the manual the pressure relief is a cartidge type and non adjustable - also it doesnt tell you where exactly it is or what it looks like - is it possible to get it out without removing the control unit ?
ok so i took the pressure relief valve out and it did have some dirt int he bottom i cleaned and put it back in - put everything bavk together and still no improvement - any ideas what to check next ?i was looking at the wrong disgram i know where it is but as its non serviceable any point taking it out?
also i seem to lose more hydraulic power after it runs for a few minutes and gets warmer it seems to lose more lift power the longer i use it ?ok so i took the pressure relief valve out and it did have some dirt int he bottom i cleaned and put it back in - put everything bavk together and still no improvement - any ideas what to check next ?
i have read a similar thread which had these symptons and said either relief valve or gear pump - how do you confirm which one ? do i need to pressure test gear pump firstalso i seem to lose more hydraulic power after it runs for a few minutes and gets warmer it seems to lose more lift power the longer i use it ?
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