I have a 1987 New Holland L555 skid steer, which I've been fixing up. There was a hydraulic fluid leak coming out from around the check valve of one of the quick disconnects, which I seemed to have stopped by spraying it with penetrating oil and pushing it in and out a bunch of times. I checked the hydraulic fluid level, which I hope is what that dip stick is for, next to your left foot while sitting in the cab and it was very low. I had to add several gallons of hydraulic fluid to bring it up to the correct level. You're supposed to check it with the arms down and the bucket tilted all the way back, right? Now the arms go up and down just fine, but there is a problem with the bucket tilt. It only moves a tiny bit forward when I press the pedal down and doesn't tilt back at all. However, I discovered that when I put the arms pedal in the float position, then the tilt function seems to work just fine. Any idea what could be causing this strange problem, please?
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I moved your post.Sorry, I think I might have put this in the wrong forum section, is it possible to move it?
Yes, measure the oil with arms and bucket down on the ground.
As for the tilt not working, i assume the pedal is actually moving forward and backward correctly? not locked out?
Running the machine at idle, can you hear the engine bog down at all when operating the tilt? or a whistle from the relief?
There may be safety devices in the system, but they jenerally lock the lift out too, so that seems very odd.
Hopefully Mike will pop his nose in here, he knows his NH machines.
Tazza took the words right out of my mouth. Does the engine labor when the bucket pedal is moved? If your serial number is after 750014 there is a solenoid valve for the bucket control, but putting the lift pedal in the float position should not change anything. The bucket control valve spool is the first one to get oil from the hyd pump so putting the lift pedal in float should not affect the bucket.I moved your post.
Yes, measure the oil with arms and bucket down on the ground.
As for the tilt not working, i assume the pedal is actually moving forward and backward correctly? not locked out?
Running the machine at idle, can you hear the engine bog down at all when operating the tilt? or a whistle from the relief?
There may be safety devices in the system, but they jenerally lock the lift out too, so that seems very odd.
Hopefully Mike will pop his nose in here, he knows his NH machines.
If you have the solenoid in the bucket circuit, and the engine pulls down, I would look at the seat switch.
Thank you for the replies I will definitely check that out ASAP and report back. I think it does have a seat switch or it used to have one, as I notice a pair of wires going underneath the seat, but when I looked under the seat it was cut off and wired together and wrapped in electrical tape.Tazza took the words right out of my mouth. Does the engine labor when the bucket pedal is moved? If your serial number is after 750014 there is a solenoid valve for the bucket control, but putting the lift pedal in the float position should not change anything. The bucket control valve spool is the first one to get oil from the hyd pump so putting the lift pedal in float should not affect the bucket.
If you have the solenoid in the bucket circuit, and the engine pulls down, I would look at the seat switch.
Started it up and I noticed there is a kind of a buzzing sound, like MMMMRRRRR and when I press the lift pedal that noise disappears and the engine sound changes. When press the tilt pedal the buzzing sounds disappears but the engine sound doesn't change.Thank you for the replies I will definitely check that out ASAP and report back. I think it does have a seat switch or it used to have one, as I notice a pair of wires going underneath the seat, but when I looked under the seat it was cut off and wired together and wrapped in electrical tape.
Since you had a coupler leak I take it you have auxillary hydraulics on the loader. Is that valve in neutral?Started it up and I noticed there is a kind of a buzzing sound, like MMMMRRRRR and when I press the lift pedal that noise disappears and the engine sound changes. When press the tilt pedal the buzzing sounds disappears but the engine sound doesn't change.
My serial number is 711327 by the way. Where is the valve for the auxillary hydraulics? Is that on the right hand lever that moves side to side? It is kinda sticky. Where is the neutral position?Since you had a coupler leak I take it you have auxillary hydraulics on the loader. Is that valve in neutral?
If you have a lever for the aux hydraulics, move the lever all the way to the left and right, work out the middle, this is where it should be. On Bobcat machines, you move it all the way to the left and let it spring back to centre.My serial number is 711327 by the way. Where is the valve for the auxillary hydraulics? Is that on the right hand lever that moves side to side? It is kinda sticky. Where is the neutral position?
The auxillary control handle is on the right steering lever. It pivots right to left or you could say up and down. There should be a cable attached to it that goes to the auxillary vavle. If it is sticky you may want to disconnect the cable at the vavle and see if the valve spool self centers. Nothing else makes sense for the type of problem you are experiencing.My serial number is 711327 by the way. Where is the valve for the auxillary hydraulics? Is that on the right hand lever that moves side to side? It is kinda sticky. Where is the neutral position?
The noise you are hearing may be the relief valve opening because the auxillary control valve spool is not in neutral. The spring inside the valve should pull the spool back to the center neurtral position.
Yes, you were right on about it being the cause. The valve itself was stuck, but I freed it up with some penetrating oil and a crow bar and pushed the valve up and the tilt works now. The spring above the valve is pretty rusty. The bolts holding the cable were lose so I have to try to get it to the correct place and tightened it down. The right hand lever folds down to the left 90 degrees from a vertical position to a horizontal position. So your saying it's supposed to self center to a neutral position at around 45 degrees?The auxillary control handle is on the right steering lever. It pivots right to left or you could say up and down. There should be a cable attached to it that goes to the auxillary vavle. If it is sticky you may want to disconnect the cable at the vavle and see if the valve spool self centers. Nothing else makes sense for the type of problem you are experiencing.
The noise you are hearing may be the relief valve opening because the auxillary control valve spool is not in neutral. The spring inside the valve should pull the spool back to the center neurtral position.
Once you get the linkage freed and back into place you can adjust the angle the handle is at so the spool in the valve moves to the end of its stroke both ways.Yes, you were right on about it being the cause. The valve itself was stuck, but I freed it up with some penetrating oil and a crow bar and pushed the valve up and the tilt works now. The spring above the valve is pretty rusty. The bolts holding the cable were lose so I have to try to get it to the correct place and tightened it down. The right hand lever folds down to the left 90 degrees from a vertical position to a horizontal position. So your saying it's supposed to self center to a neutral position at around 45 degrees?
