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1020 hydraulic issues

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Bob
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PostPosted: Fri Dec 01, 2017 8:03 am    Post subject: Re: 1020 hydraulic issues Reply to specific post Reply with quote


IIRC, if steering pulls to one side there's a problem in the power steering gear... IIRC, if you get far enough into the valve section you have to keep track of shims as used/have special tools or procedures to select shims.

I would bet on an issue somewhere in that valve area, in the upper part of the guts of the power steering gear.

You surely aren't operating it with the cover/RH bearing missing from the steering shaft, are you?
 
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buickanddeere
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PostPosted: Fri Dec 01, 2017 8:20 am    Post subject: Re: 1020 hydraulic issues Reply to specific post Reply with quote


As previously stated. Stop that open centre operation with the oil flowing through that 3rd line directly into the transmission case.
Oil should only flow from the loader valves and back into the tractor filter housing. When the loader control valve is operated to move the loader.
The previous tinkerer who cobbled up the 3rd line mess needs a good swift kick on the backside.
 
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mb1020
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PostPosted: Fri Dec 01, 2017 8:38 am    Post subject: Re: 1020 hydraulic issues Reply to specific post Reply with quote


So if I understand correctly... cap off the output at the pump, then check pressure off the pump directly using the port on top opposite the destroke valve?
 
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mb1020
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PostPosted: Fri Dec 01, 2017 8:43 am    Post subject: Re: 1020 hydraulic issues Reply to specific post Reply with quote

The first pic is the working tractor. the second pic is the spare part tractor. The lines are hard to see but definitely crushed.
 
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mb1020
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PostPosted: Fri Dec 01, 2017 8:55 am    Post subject: Re: 1020 hydraulic issues Reply to specific post Reply with quote

Bob, Yes that's what I thought about the steering. But here is what I did: I have 2 pretty much identical machines. Before ripping apart the steering on the running tractor, I tore out the one on the parts tractor, replaced ALL the seals, cleaned the valves, one was sticking a bit, and installed it on the running tractor. I had the other valve set as a guide, and installed everything the same as I took it out.
When I tested it, the steering operated slightly better, but stilled pulled to the right as soon as I let go of the wheel, moving or not. this was the same symptom I had before switching out and rebuilding the entire valve assembly. I guess it's possible that both machines had the same exact problem but it seems a bit unlikely. and No the cover is back on the tractor. Very Happy
 
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gene g
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PostPosted: Fri Dec 01, 2017 7:56 pm    Post subject: Re: 1020 hydraulic issues Reply to specific post Reply with quote

You can put the gauge directly on out put end of an open center pump . The pump will destroke and stop pumping when it hits standby pressure . You can then adjust to
correct pressure . Then reconnect pressure line. If pressure drops you know you have an internal leak on the high pressure side. In loader, 3point , steering ,or
selective control. You will then be able to eliminate one at a time to find your problems .When you resealed steering and replace orings did you remove the housing or just the valves and shaft .
 
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buickanddeere
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PostPosted: Fri Dec 01, 2017 8:55 pm    Post subject: Re: 1020 hydraulic issues Reply to specific post Reply with quote


A wee slip there, and I'll admit I have done worse. Closed centre destroys, the open centre lifts the relief valve if dead headed .....if the relief valve is between the pump and the dead head.
 
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gene g
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PostPosted: Fri Dec 01, 2017 8:59 pm    Post subject: Re: 1020 hydraulic issues Reply to specific post Reply with quote

SORRY I said open center pump my mistake I should have said closed center pump . My mistake my proof reading needs some help.
 
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Tx Jim
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PostPosted: Sat Dec 02, 2017 3:54 am    Post subject: Re: 1020 hydraulic issues Reply to specific post Reply with quote

Bob wrote:
(quoted from post at 11:03:33 12/01/17)
IIRC, if steering pulls to one side there's a problem in the power steering gear... IIRC, if you get far enough into the valve section you have to keep track of shims as used/have special tools or procedures to select shims.

I would bet on an issue somewhere in that valve area, in the upper part of the guts of the power steering gear.


I agree with Bob in that problem with steering should be in steering housing assembly.

BUT 1st thing you need to do is get hyd loader control valve repaired or replaced so no oil exits return hose when valve is in neutral.
 
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buickanddeere
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PostPosted: Sat Dec 02, 2017 7:09 am    Post subject: Re: 1020 hydraulic issues Reply to specific post Reply with quote

buickanddeere wrote:
(quoted from post at 00:55:41 12/02/17)
A wee slip there, and I'll admit I have done worse. Closed centre destroys, the open centre lifts the relief valve if dead headed .....if the relief valve is between the pump and the dead head.



D@mmed Spell Checker............" De-Stroked" not "destroyed".
 
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mb1020
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PostPosted: Sat Dec 02, 2017 8:12 am    Post subject: Re: 1020 hydraulic issues Reply to specific post Reply with quote


Jim, where did you get the image of the valve you mentioned with the plug. I can't find one like that on JDparts. None of the sectional drawings seem to match my loader. They all look like closed center. Perhaps someone replaced the valve? Your image looks right, but I need part numbers.
The image below is the closest one I found but the plug looks wrong.

I'm going to replace the supply lines first, because if the pump is not getting enough oil flow there is no point in checking anything else.

On the steering, I pulled everything apart, completely stripped it down. I replaced one shim that was worn with one off the the spare steering valve. No signs of wear otherwise. The only thing that may be a problem is one of the tiny valves was not operating very well. I cleaned it and would guess it was at 90% when I put it back in. That was the upper valve. I would have just swapped the valve but the other spare one was much worse. I should have seen a major improvement after the rebuild, even if the new valve was not 100%.
 
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Tx Jim
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PostPosted: Sat Dec 02, 2017 10:15 am    Post subject: Re: 1020 hydraulic issues Reply to specific post Reply with quote


You can find schematic for convertible(OC to CC & vice versa) valve in JD parts catalog for model 37,48 & 145 loaders plus probably more catalogs.

On steering if one or more of the 6 large o-rings is leaking it can make hyd's do strange things especially heat up & cause frt pump to cavitate.


 
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mb1020
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PostPosted: Sat Dec 02, 2017 2:00 pm    Post subject: Re: 1020 hydraulic issues Reply to specific post Reply with quote

thanks Jim.

Yeah all the orings got switched out, but it could be possible one got out of place when the valve assembly was inserted in the housing. Not exactly easy to get back together.

Just doesn't make sense to me the new (different) valve would have the exact same issue as the old one I removed.

I've had issues for a long time with the steering locking when stepping on the brakes a lot especially when using the bucket, however this new problem of the steering pulling right started not long after the last time we split the tractor. The tractor is also much easier to steer while moving then when stopped. Most of the time I have no power steering to the left, and as soon as you let go of the wheel it pulls all the way right every time.
 
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Tx Jim
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PostPosted: Sat Dec 02, 2017 2:25 pm    Post subject: Re: 1020 hydraulic issues Reply to specific post Reply with quote


Applying brakes on a JD utility tractor of this era should have little to no affect on operation of hyd's because only thing hyd's do is keep brake valve reservoir full by means of trans pump pressure.
 
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mb1020
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PostPosted: Sun Dec 03, 2017 4:59 am    Post subject: Re: 1020 hydraulic issues Reply to specific post Reply with quote

Gene, yes the steering housing was swapped as well. I looked at it pretty carefully and couldn't see any obvious flaws.
 
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