Allis 200 SN 1803 Hydraulic PTO
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=156983
Printed Date: 05 May 2025 at 4:02am
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Topic: Allis 200 SN 1803 Hydraulic PTO
Posted By: smitty78
Subject: Allis 200 SN 1803 Hydraulic PTO
Date Posted: 06 Jan 2019 at 6:49pm
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I've got my old 200 tractor in the shop for some maintenance on the starter, alternator, and pump-injector overhaul. Currently hydraulic PTO not working at all so I want to look at that as well. Shifter moves into the 3 positions fine. Valve seemed a bit sticky so removed and working to fix that. If it still won't work, what's the next debug step to try & get it working without a split ? Thanks
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Replies:
Posted By: Lynn Marshall
Date Posted: 06 Jan 2019 at 9:24pm
| It could be disconnected internally. Check between the battery box and the torque tube for a lever that might have moved. |
Posted By: HagerAC
Date Posted: 06 Jan 2019 at 9:25pm
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Make sure the manual shifter on the side of the housing behind the battery box is shifted so it couples the 2 shafts together inside ------------- 30+ A-Cs ranging from a 1928 20-35, to a 1984 8070FWA, Gleaner R52 |
Posted By: MACK
Date Posted: 07 Jan 2019 at 7:31am
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Turn pto by hand. If it spins free, coupler has slid forward. If there is some drag you have other problems. No need to split for most pto repairs. Drop pto box. MACK |
Posted By: Alvin M
Date Posted: 07 Jan 2019 at 8:07am
| check pressure to pto clutch center line at pto housing put gauge right line |
Posted By: smitty78
Date Posted: 07 Jan 2019 at 8:19pm
Thanks so much for the information. The pto does turn easily by hand and will check pressure. I'll look for something behind the battery box even though my hydraulic pto doesn't have any linkage or lines going that way. Verified all of the hydraulic lines go to and from the correct place. Made my way through the PTO valve and found the control rod side prone to stick so polished it up. On the other side found a chunk gashed out of the relief valve spool which made the plunger stick. Didn't find the chunk. It was hard to tell if the tiny orifice was plugged but it may have been. Would this damage make the pto system completely unresponsive ? Is this a salvage yard only part ?  |
Posted By: MACK
Date Posted: 07 Jan 2019 at 9:07pm
| If it spins free, coupler has slid off. Remove PD valve and plate. With a bar, reach through hole and slide it back on. MACK |
Posted By: smitty78
Date Posted: 26 Jan 2019 at 3:53pm
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Since the PTO valve damaged parts are mated to the parts, I got a valve outa salvage. The one sent is the greater than SN 4001 version but perhaps it will work. Strangely the caps were switched compared to my old valve. Does anyone know if the cap with the notches (larger internal cavity) aligns with the control rod side or the relief valve spool side of the PTO valve ? (See photo)  |
Posted By: smitty78
Date Posted: 26 Jan 2019 at 3:58pm
And, Mack, attached is a pic of the PTO shaft with the power shift valve and plate removed ... the shaft is disconnected from the coupler but I thought perhaps it was moved to engage when the PTO is engaged. If not I should use a bar to slide the coupler onto the shaft correct ? What makes it stay in that position ? Thanks. |
Posted By: DougG
Date Posted: 26 Jan 2019 at 4:13pm
| Theres springs and balls that hold the coupler in one spot, the balls fall into detent holes that holds them |
Posted By: DrAllis
Date Posted: 26 Jan 2019 at 4:35pm
| There is a short lever behind the front of the battery box. I can see it in the picture. |
Posted By: smitty78
Date Posted: 26 Jan 2019 at 4:39pm
And of course there is a metal strap with a hole in it, attached to a shaft between the battery box & housing. Initially looks like an anchor point for something. Doesn't look like an adjustable lever, no handle, nothing in my owners manual about it, no stickers or cast features to hint which direction engages or disengages, but it's there and it moves the coupler into engagement by rotating the hole in the strap toward the radiator. Likely didn't need a new valve at all but live & learn. I owe you guys coffee & pie, if only there was anywhere to get it anymore.   |
Posted By: smitty78
Date Posted: 26 Jan 2019 at 4:49pm
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So now that some of this stuff is exposed, is there any opportunity to address the fluid movement between the powershift & hydraulic reservoirs ? Maybe the new to me PTO valve will magically stop the transfer lol.
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Posted By: DrAllis
Date Posted: 26 Jan 2019 at 5:19pm
| If you are losing hydraulic oil (left dipstick when sitting in the seat) and gaining oil in the transmission/differential (right dipstick when sitting in the seat), the problem requires a split of the tractor at the area under the platform. No proper fix without a split. There can be a homemade oil transfer hose installed to allow oil to level itself out between the two sumps. I assume two drain plugs are removed and a hose connects between them. Don't actually know as I've never done one that way. |
Posted By: smitty78
Date Posted: 26 Jan 2019 at 9:50pm
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Gotcha, I have a little pump I use to transfer the overfull side back to the low side and don't have to do it very often so I'll keep doing that till I have to go in for some other reason. 1 other question though, anybody know how water gets into the hydraulic fluid on these 200's ? Seems like if it sprinkles for 5 minutes the oil is 1/2 water. I just flat have to put it inside even if it's only foggy. Can't seem to figure out how it gets in, but of course I'm the same dude that didn't go look for that pto lever first thing, so my thinkin track record is not so hot.
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Posted By: DrAllis
Date Posted: 26 Jan 2019 at 10:08pm
| You must not have the platform cover over the dipsticks installed ?? |