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Allis Chalmers Discussion Forum
:

ac wd hydraulics...

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southerland_1

03-03-2012 18:21:19




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I am restoring an ac WD. Changed all fluids and the when I raise the 3pt it seems slow and labored. Also has an unsettling noise involved....I used 5w 20 oil in the hydraulics...any ideas?




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Ric. Ks.

03-06-2012 20:01:09




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 Re: ac wd hydraulics... in reply to southerland_1, 03-03-2012 18:21:19  
The pump is a piston pump running on a cam shaft.
you will feel a slight vibration as it lifts. If it studders badly you may have a broken spring or two that hold the pistons against the cams. Ive not had that happen too often but have found it to cause a slow gerky lift.



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NEKS

03-05-2012 20:37:19




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 Re: ac wd hydraulics... in reply to southerland_1, 03-03-2012 18:21:19  
Dad bought a new WD in 51 and as a kid remember he always used 20W-20 in the engine and the hyd. all year round.



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greygoat

03-05-2012 07:57:53




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 Re: ac wd hydraulics... in reply to southerland_1, 03-03-2012 18:21:19  
Detergent oil DOESN'T foam..Thats an "old wives
tale", in fact detergent oil has LOTS of Anti-
foam inhibitors. The "TERM" "DETERGENT" in lube
oil means that it "holds dirt in suspension"
until it reach's the filter, where the dirt is
filtered out, thus giving a cleaner oil!



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sid

03-05-2012 12:09:38




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 Re: ac wd hydraulics... in reply to greygoat, 03-05-2012 07:57:53  
The manual states oil used in hydraulic pump must not foam. Some of the early detergent oils had a tendeancy to foam.



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southerland_1

03-05-2012 08:43:35




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 Re: ac wd hydraulics... in reply to greygoat, 03-05-2012 07:57:53  
So are we saying that its probably normal and I shouldn't worry about it?



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sid

03-05-2012 12:42:50




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 Re: ac wd hydraulics... in reply to southerland_1, 03-05-2012 08:43:35  
Was it slow and labored before you changed the fluids?

As far as being normal a lot of these old tractors do that. It doesn't mean it is right.

As for worrying about it I doubt the tractor will dissolve.

Allis Chalmers, Stated in the manual the oil used must not foam. The local dealer said do not use detergent oil. I understand detergent oil holds the dirt particles in suspension. The hydraulic system on a WD does not have a filter, that is why I do not use detergent oil in my WD's hydraulics plus the fact I wonder what it does to the seals.

I agree modern day hydraulic oil is better than what they had back in the day but I still use a straight weight non detergent oil for the hydraulic on my WD.

In my opinion the fact that over the years a lot of farmerts did or did not do what the manufacture recomended speasks well these old tractors.

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BushogPapa

03-03-2012 19:53:49




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 Re: ac wd hydraulics... in reply to southerland_1, 03-03-2012 18:21:19  
I've never had any trouble using 10-30 or 10-40 Engine (Detergent) oil in my Hydraulic system..

Are you familiar with the WD and the normal sounds associated..?? Maybe you had a little air in the system..??

Ron.



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southerland_1

03-04-2012 08:06:00




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 Re: ac wd hydraulics... in reply to BushogPapa, 03-03-2012 19:53:49  
It does sound like a chatter....just sounds a little rough is the cause for concern. I'm not really familiar with the tractor but it was slightly alarming because I don't recall the noise before I changed the fluid but I didn't play with it too much or have a load on it then either. And yes its been cold here



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old

03-03-2012 18:55:38




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 Re: ac wd hydraulics... in reply to southerland_1, 03-03-2012 18:21:19  
If that is a detergent oil you could well have t foaming and that in turn will cause problems I think if I remember right that it calls for a non-detergent type oil and now days I use a UTF hyd/tran oil in my machines



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Aaron SEIA

03-03-2012 18:45:05




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 Re: ac wd hydraulics... in reply to southerland_1, 03-03-2012 18:21:19  
They run pretty slow when cold. Did the noise sound like a chattering sort of noise? Pretty normal too. When the cylinder rods hit max stroke, the pump will chatter at ma pressure then unload and chatter some more.

AaronSEIA



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Ted in NE-OH

03-03-2012 18:40:17




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 Re: ac wd hydraulics... in reply to southerland_1, 03-03-2012 18:21:19  
Hydraulics are initially slow in cold weather. Could that be the cause?



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soundguy

03-03-2012 18:50:17




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 Re: ac wd hydraulics... in reply to Ted in NE-OH, 03-03-2012 18:40:17  
5w20 shouldn't be too thick inthe cold.. it's almost water anyway.. :)



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