Farm Equipment - D17 Series IV Hydraulics

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D17 Series IV Hydraulics

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=178229
Printed Date: 25 Aug 2025 at 11:04pm
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Topic: D17 Series IV Hydraulics

Posted By: Smeyer87
Subject: D17 Series IV Hydraulics
Date Posted: 09 Feb 2021 at 10:00pm

So I have a series IV D17 that I added a spool valve to for a second set of remotes to run a loader. Since installing the spool valve I have done nothing but fight the hydraulics. Currently it has started running oil out of both sides where the 3 point lift arms are, three point will only pick up occasionally and the pump sounds like the hydraulic fluid is cavitation. If I hold the three point lever to lift it just gurgle's and then will act like it catches fluid and will work. Theater won't do much of anything. I'm at a loss as I didn't have the leaks before this and now nothing is working properly. Any help would be much appreciated.

Replies:

Posted By: Smeyer87
Date Posted: 09 Feb 2021 at 10:03pm

The loader won't do much of anything.

Posted By: DrAllis
Date Posted: 09 Feb 2021 at 10:11pm

Sounds like it is low on hydraulic oil, number one. And number two, if you have leaks, you've done something wrong assembling the valve stack. There are a certain amount of Oring seals between each section and the torque on the three tie bolts isn't that terribly tight. They must be snugged up gently a little at a time to get an even and equal squeeze on all three tie bolts.You did use new Orings ??

Posted By: Smeyer87
Date Posted: 09 Feb 2021 at 10:16pm

Its not leaking at the valve stack it is leaking on both sides of the 3 point at the lift arms.

Posted By: DrAllis
Date Posted: 09 Feb 2021 at 10:18pm

So, if it is leaking at the lift arm SHAFT, the transmission is OVERFULL with oil. The hydraulic oil dipstick is to the LEFT of the gearshift. You have added oil in the wrong hole ???

Posted By: Smeyer87
Date Posted: 09 Feb 2021 at 10:34pm

I filled in the hole that has the threaded district to the left of the shifter. Not the push in district to the right.

Posted By: DrAllis
Date Posted: 09 Feb 2021 at 10:37pm

The only reason the lift arm shaft can leak is because the transmission is overfull of oil. I still think you are low on oil in the hydraulics because they don't work right. That's what I think. I'm not there looking at it.

Posted By: DrAllis
Date Posted: 09 Feb 2021 at 10:40pm

Maybe you need to re-check both oil levels with the engine off and been sitting on level ground overnite. Leave that hydraulic fill dipstick very loose, so it can breathe air if it is plugged up, which it could be. How long have you owned this tractor ??

Posted By: Smeyer87
Date Posted: 09 Feb 2021 at 10:58pm

Not long couple of months and not much history on it. It's been sitting for about 2 weeks so I can check it in the morning.

Posted By: Joe(TX)
Date Posted: 10 Feb 2021 at 8:12am

Since you added a control valve, it may have something to do with how it is plumbed in.

Is it a power beyond valve?

Were is the return connected?

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1970 190XT, 1973 200, 1962 D-19 Diesel, 1979 7010, 1957 WD45, 1950 WD, 1961 D17, Speed Patrol, D14, All crop 66 big bin, 180 diesel, 1970 170 diesel, FP80 forklift. Gleaner A

Posted By: MACK
Date Posted: 10 Feb 2021 at 10:19am

Is this valve bolted to tractor valve or is it a separate valve mounted somewhere else ? Sounds like you teed into pressure line. If so, that won't work. MACK

Posted By: DrAllis
Date Posted: 10 Feb 2021 at 10:48am

Well, I interpreted it to mean he added an extra A-C valve to the stack making it a four-outlet tractor on the rear plate. Maybe not. Still no real reason for this oil transfer problem on a real series four.

Posted By: Smeyer87
Date Posted: 10 Feb 2021 at 12:12pm

Yes I added another allis chalmers valve to the stack and bolted back into factory location.

Posted By: Gatz in NE
Date Posted: 10 Feb 2021 at 12:54pm

When adding the valve to the stack, make sure that the small poppet valve and very light spring are in place before bolting it up.

And use the correct AC threaded rods for the assembly; don’t use

“redi-rod” or all-thread. Neither are suitable.

The Dr is correct about the valve(s) not playing a part in the too-full situation.

Posted By: DrAllis
Date Posted: 10 Feb 2021 at 2:14pm

So, is the transmission overfull on oil and the hydraulics low on oil ?????

Posted By: tbran
Date Posted: 10 Feb 2021 at 6:24pm

If everything was ok til you added the extra valve - I 'm with Gatz - bet the valve did not have the pilot check and spring to go with it - my 2 c worth.

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When told "it's not the money,it's the principle", remember, it's always the money..

Posted By: MACK
Date Posted: 10 Feb 2021 at 8:40pm

I would agree about the pilot check. MACK

Posted By: Smeyer87
Date Posted: 10 Feb 2021 at 9:35pm

The check valve and spring are in there. Checked fluid level today and it is full. It acts like its just suckng air and not fluid. Maybe I need to replace the supply line to the pump.

Posted By: DrAllis
Date Posted: 10 Feb 2021 at 10:21pm

But, what about your claim of dripping oil from the lift arm shaft ????

Posted By: tbran
Date Posted: 11 Feb 2021 at 8:44am

another thing - your old seal on the pump drive shaft could have failed... slightly pressurize the hyd compartment - slightly - with shop rag and blow tip air gun - if the pump works - seal time. But like Doc asks - the rear oil level is a puzzle..

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When told "it's not the money,it's the principle", remember, it's always the money..

Posted By: Smeyer87
Date Posted: 11 Feb 2021 at 12:18pm

Where would I be pressurizing at the fill hole?

Posted By: Kenny L.
Date Posted: 11 Feb 2021 at 4:30pm

Smeyer87, Do you have a smartphone? If you do snap some pictures of the valve stack that you change and were the oil is come out of the lift arm and you can text them to me if you can't get them to upload and I'll post them for you. Hope this will help you. Kenny L. five six three-920- two two 7 two

Posted By: tbran
Date Posted: 12 Feb 2021 at 10:07am

yes - just enough to prevent the pump having to suck up the oil . We loosely wrap a rag around a blow gun and just barley tap the guns lever a couple of times. If you over pressure the system you could blow a seal - but you would really have to hold it to do that - if one has to use this method to prime a pump - there is a issue with the pump or supply lines/hoses. Another thought - milky oil will cause the oil to foam - thus cavitation from the water dissolved in the oil.

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When told "it's not the money,it's the principle", remember, it's always the money..

Posted By: Gatz in NE
Date Posted: 12 Feb 2021 at 10:59am

The return line from the "stack" is still where it had always been, right?

A sudden leakage at the lift arms would indicate an over-full situation as the good Dr said.

In regards to the pump sucking air;

On D17sIV prior to s/n 76949, AC used a tube with a hose (pn 70242564) connection.

it's possible that air is getting in from it, especially if the hose clamps are not tight.

Effective s/n 76949, AC used an all-metal tube assembly. If fittings are not tight, it could allow air in also.

Either arrangement still doesn't explain the leakage.

Posted By: LaJaMe
Date Posted: 15 Feb 2021 at 10:26pm

Make sure there is NO check valve ahead of the valves. Had that happen to us. Everything worked slow until we put the check valve after the valve levers.

Posted By: Gatz in NE
Date Posted: 03 Jun 2021 at 9:52pm

so, what was the problem ?

Posted By: LaJaMe
Date Posted: 04 Jun 2021 at 9:52pm

Ours is a Model 200 industrial loader. Front pump with the reservoir in the loader brackets and the levers plum bed in there. We added and auxilary 2 double spool controls after the loader controls. Rear hydraulics were about half speed. Found that the relief valve at the loader controls was dumping fluid and pressure to the rear. Plumbed it straight back to the rear and then to loader controls where it dumped back into the reservoir. Hope this makes sense as I am doing it off my memory. Works great so all the effort and though paid out. The 17 handles the loader ( round bales @ 800-1000lb) and with 2 double and the normal single spool on the rear. Might be one of a kind but we love it.