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Allis Chalmers Discussion Forum
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D-17 Series IV Hydraulics

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David J. Jackso

09-30-2003 18:42:52




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I have aquired a series IV and am having some hydraulic problems. I have installed the hoses to the rear cylinders and the pump is working. However, they will not raise or lower. This is the only lever that works. The other two outlets are frozen in place. This tractor has sat for awhile. Is there some way to bleed the cylinders to get them to work or might there be other problems? The other problem is the pump is becoming extremely hot when you run the tractor. Is this a common problem with these tractors or is something messed up. Any advice to fix these hydraulics would be greatly appreciated.

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Gatz

10-03-2003 08:48:48




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 Re: D-17 Series IV Hydraulics in reply to David J. Jackson, 09-30-2003 18:42:52  
David,
I have a Series IV that I'm restoring. The hydraulics need attention on mine too, but I've not worked on them yet, only removed them and cleaned them up. I noticed that one of the valves is sticking...it's the one tied to the mechanism connected to the arms. All this stuff works together. (The lift-lower, the TB, & the position control) The fact that your pump is getting hot would indicate that the oil is going over a relief valve all the time. It could be the pump portion that feeds the TB (the smaller line) or it could be the main pump that's pumping over the relief valve; either way, the valves need to be freed up. If your TB guage is functional; and shows a pressure reading all the time, that would indicate the problem is with the TB valve.
Also, according to the service manual, the small cast aluminum covers at the back of the valve stack should have rubber plugs in the small hole, but I plan on using vented plugs in mine.

On my tractor, there is a rod down underneath that connects the lift arm to the compressed-spring assembly right in front of the right axle housing. This rod is not straight. Is the one of your tractor straight?
Gatz

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Dave

10-05-2003 15:46:43




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 Re: Re: D-17 Series IV Hydraulics in reply to Gatz, 10-03-2003 08:48:48  
I checked dad's 170 today. It has basically the same hydraulics and his rod is strait.

Dave



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Dave

10-03-2003 18:58:01




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 Re: Re: D-17 Series IV Hydraulics in reply to Gatz, 10-03-2003 08:48:48  
Gatz, thanks for your reply. I looked for the rod you mentioned. I do not have it on mine. There is a rod coming from the cylinder to a triangle piece, but no rod going up to the levers at the valves. When I had it in the shop they said I had a bunch of linkages missing, which might be why they did not want to touch the hydraulics. I gather from what you said the two rear levers should be connected to the front three which are also connected to the cylinder at the bottom. If I am missing these linkages am I correct in beleiving it isn't going to work correctly? If so where can I go about finding them?

In regards to the pump getting hot, do you mean that if the two valves on the left side of the pump are stuck this may be what is causing the pump to get hot?

The valve on the left is leaking behind the housing but in front of the aluminum sleeve. I did take the cap off and tried to tap the sleeve into the housing a bit but it still leaked. Is the stuck valve part of the reason it is leaking?

Dave

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Gatz

10-06-2003 08:49:50




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 Re: Re: Re: D-17 Series IV Hydraulics in reply to Dave, 10-03-2003 18:58:01  
Dave, It sounds like you're missing some linkages allright, but I'm not sure what they are. I'm guessing that it might be a vertical link from that triangular piece up to the underside of the valve system. This link is about 14" long and has a pre-loaded compression spring to prevent over travel. I still have mine disassembled and could take some pictures of all of this stuff layed out flat if that will help. As far as finding replacements for what might be missing, the parts would have to come from a Series IV or (from what I've heard) a 170. It's my guess that if the valves could be placed in their respective "neutral" positions, the hydraulics would work. The system is open-center power beyond, so the pump should not be working at all unless a valve is actuated. Again, if your pump is running hot it's due to one or more of these valves being stuck. And if your remote(s) is slow to not operating at all, that means something is taking the hyd pressure away.
Perhaps some penetrating oil like Kroil would help to loosen them. Gatz

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Jcmarleau

10-02-2003 19:28:56




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 Re: D-17 Series IV Hydraulics in reply to David J. Jackson, 09-30-2003 18:42:52  
Hi David just want you to know i have a service manual for this tractor my e mail is [email protected]



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