My fel and 3 pt stopped working. Thought it may be the coupler on the front pump. Changed that out and still not working. I am getting flow to the inlet hose that connects to the husco hydraulic controller. If i take the outlet hose off, the flow is much less. I checked the detent assembly and they seem good. Is there a relief valve on the husco spool valve controller? If so, where would it be located? I have ordered a pressure gauge to test pressure as this will tell me more about the problem. This is a 99-2004 model. I pulled the relief valve out under the seat but it appeared to be working properly. The hydros for steering and transmission are still working. Thanks for any help.
L35 Husco hydro's
- Thread starter jt2hunt
- Start date
TheOldHokie
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The valve is self contained. If you have flow into the valve it should have the same flow coming out.
You have one in and two outs.
One out is power beyond and it should have the same flow as inlet.
The other out is tank and there should be no flow on it.
Dan
There is no relief valve on the FEL control valve.
When you refer to the inlet hose, I assume you mean the hose from the pump to the valve? And the outlet hose is the one back to the tank/transmission case? If so, the behavior is normal since the flow would be going out the power beyond hose - the one that loops at the back for the backhoe and continues on to the 3ph.
This is a long shot, but is it possible that Directional Valve 1 (4) in the diagram got switched? This is not the same as (7), the one you switch when you remove the backhoe to use the 3ph.
You mention the 3ph, so I assume the backhoe is not installed. You could disconnect the hose loop (with the tractor off), then start it for a few seconds and see (hear) if the relief valve relieves.
Give more detail on when/how this started and we may be able to help better.
Hi @jt2hunt
Going on your first sentence of "just stopped working", I am assuming all was well and then suddenly it was not. Is that right? Or did you change something or do something? Here is some info - but you may already know this. Kindly let us know if you have changed anything.
As @PoTreeBoy says, there is a valve that splits the hydro between backhoe and 3PT (the lever is behind the seat and connects to the valve which is under the seat) that does the splitting. For 3PT, the lever should be pushed toward the front of the tractor. (In this pic, it is pulled to the back for my backhoe)
There is also a valve built into the hard lines (under the seat) that controls pressure to the FEL
Certainly an air leak in an input line will cause problems as well as low hydraulic fluid.
I think we'll need some further details.
TheOldHokie
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He says he has flow in at the loader valve but no/diminished flow out.
How does that happen?
I have no familiarity with the plumbing on this machine so help me out here. I assume that when DV1 is in the loader position and DV2 is in the 3pt position the flow is into loader and then out to 3pt. I also assume there is an additionsl tank return from the loader valve to tank.
I also assume that when DV2 is moved to the backhoe position the flow going into the 3pt valve is diverted straight to tank disabling the 3pt.
Is that correct?
Dan
I'm a bit confused, but I think we all need a bit more info.
Is the Hydraulic fluid old? Filter?
Why did he disconnect the front pump coupler?
The front pump powers the FEL through the hard line joint under the seat through that valve in my second diagram in my first posting
The FEL control dumps the return fluid via low pressure hose into the transmission where the PTO shifter mounts. There is a nipple there for that purpose. A guess MAYBE is some crud is blocking the fluid inside the FEL control (eh, I'm not convinced).
Yes to your assumption on the Flows. The L35 has the hard line blocked if there's no loader on the machine and there is a relief valve - See pics below.
LOADER SPOOLS
Power to the Backhoe comes from the hose you look at straight on in the photo
Is the Hydraulic fluid old? Filter?
Why did he disconnect the front pump coupler?
The front pump powers the FEL through the hard line joint under the seat through that valve in my second diagram in my first posting
The FEL control dumps the return fluid via low pressure hose into the transmission where the PTO shifter mounts. There is a nipple there for that purpose. A guess MAYBE is some crud is blocking the fluid inside the FEL control (eh, I'm not convinced).
Yes to your assumption on the Flows. The L35 has the hard line blocked if there's no loader on the machine and there is a relief valve - See pics below.
LOADER SPOOLS
Power to the Backhoe comes from the hose you look at straight on in the photo
TheOldHokie
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I am a slow learner - lets take this one step at a time, Here is your picture of the loader valve showing the outlet section. Is that hose you circled the power beyond supply hose for the backhoe valve?
Dan
Dan
TheOldHokie
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OK so there there should be two other hoses on the inlet section of that valve. One is pressure in from the pump (controlled by DV1) and the other is a tank return straight into the transmission. Is that correct?
Dan
Oops, I've just realized one of my pics is incorrect.
Let me correct and add some info and this will be cleared up:
FIRSTLY - The hose that attaches to the PTO unit is from the SIDE PUMP (power steering and clutch control) - nothing to do with the FEL and front pump.
SECONDLY - This will help with your question I think:
THis is the view of the FEL control from the front.
"F" is from the Front pump via the hard lines under the seat. The front pump discharges to the rear of the tractor via a hard line. The flow goes thru DV1.
"D" is the return to the transmission (via hose and JIC fitting)
Sorry for the confusion
Let me correct and add some info and this will be cleared up:
FIRSTLY - The hose that attaches to the PTO unit is from the SIDE PUMP (power steering and clutch control) - nothing to do with the FEL and front pump.
SECONDLY - This will help with your question I think:
THis is the view of the FEL control from the front.
"F" is from the Front pump via the hard lines under the seat. The front pump discharges to the rear of the tractor via a hard line. The flow goes thru DV1.
"D" is the return to the transmission (via hose and JIC fitting)
Sorry for the confusion
TheOldHokie
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Back to what I said initially.
If you have good flow in on P then you must have the same flow out on PB and there should be no flow out on T.
Dan
Thank you for the information. Still waiting on the pressure gauge to arrive. Some more important notes that may help to diagnose the issue or point me in the direction to look.
I had been moving dirt for several days. I had recently added hydraulic fluid and after the failure the dipstick showed that I was an inch too high. So, I overfilled. This is an old tractor that has had years of work on it and has performed great for me. Overfilling may have popped an oring inside the tractor. Neither the fel or 3 pt hitch are working and I head a pop when it stopped working. This is why I thought it may be the hydraulic pump in the front. The splines on the coupler were worn off. The pump still had grooves this is why i replaced the coupling. The connection is much more solid. It seemed to have some slip in the old coupler. However, when I installed the new coupler and pump there is not movement in the hydraulics.
If I move the fel control lever, the front bucket slightly moves but will not continue to move in any direction. It is sitting on the ground.
One other note. The 3 pt lift did not go down until i drove back to the shop and lowered the handle. The fel was driven back to the shop with it on the ground. It was down when the unit failed. I do not know if this means had it been all the way up when it failed that it would have fallen or stayed up. Let me know if there is any other information that would help.
Thank you again.
Hi @jt2hunt
Are you saying the coupling (Circled in the picture) is the one with stripped splines?
So you think the pump stopped pumping because it wasn't being turned - correct?
That would certainly make sense. Did you take the pump apart?
When I rebuilt mine, the 2 front bearings were complete junk - I wonder if those bearings are ok in yours?
I doubt overfilling would hurt anything - the transmission does have a vent hose on top left side which I suspect would overflow if it were necessary.
Do you think the "pop" sound was from the failed coupler?
If you have a leak in the suction line (Large one on the front pump). That line from the sump, feeds both the front and side pumps.
If there's a leak anywhere in the system, the FEL won't work well or at all.
A leak could be the pipe itself, the rubber suction lines at the filter or even the suction line for the side pump (power steering).
If the steering is working correctly, then the side pump is working and likely no suction leaks.
FYI, for those concerned - this is the L35 Front pump arrangement
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TheOldHokie
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Yes the coupling pictured in the circle. I replaced the coupling, two bearings, and the cap. No leaks because the transmission and steering are working. I suppose it could be something inside the pump itself. Once I get pressure gauge then I can test in certain areas and see if we build pressure. I am not versed in hydraulic systems so I am learning as I go. No i did not take the pump apart but wishing I would have. How would I know if it is the pump not working properly?
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Yes, would've been good if you'd taken it apart.
It's just a gear pump nothing fancy inside.
But something went haywire - just don't know. But does seem to point to the front pump.
Could've been something that broke a tooth or something in the pump - but somehow that just doesn't seem likely to me.
When you reinstalled the suction pipe (top pipe) and the delivery pipe (smaller one) did you ensure that the rubber Oring was situated in the recess?
You could disconnect the delivery hose to the FEL and put in thru a hole in a 5 gal bucket lid (see above posts for location) and see if the pump pumps fluid into a bucket when started briefly.
That might be a lot of trouble since you have to disconnect a swivel fitting and not sure where that is on your tractor. This is of course in-lieu of a gauge. At least you'd know if the pump was drawing fluid.
Maybe someone else has a better idea.
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Yes orings are back on. Yes I have flow at fel, but I am not sure how much flow it should be from just eyeballing.
TheOldHokie
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Any flow will power an actuator if it comes with pressure.
I dont think taking the gear pump apart is a productive use of your time. You can learn all you need to know with external testing. Do you know how to test pressure with your new gauge?
Dan