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D12 Allis hydraulic pump
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Showboat six View Drop Down
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Joined: 28 Feb 2024
Location: Oregon
Points: 3 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Showboat six Quote  Post ReplyReply Direct Link To This Post Topic: D12 Allis hydraulic pump
    Posted: 28 Feb 2024 at 10:17pm
I am working on a 1961 Allis D12 with the PTO hydraulic pump and I cannot get it to make any pressure. I have bled quart and a half of oil out of the hydraulic ram hose but I cannot get it to pump any kind of pressure. Any ideas??

This is the first running of a restoration and I have no information on whether the pump ever worked before the restoration was started.

Any information would be greatly appreciated.
Showboat

Edited by Showboat six - 28 Feb 2024 at 10:17pm
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only AC orange View Drop Down
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Joined: 06 Dec 2014
Location: Eastern Indiana
Points: 452 		Post Options Post Options   Thanks (0) Thanks(0)   Quote only AC orange Quote  Post ReplyReply Direct Link To This Post Posted: 29 Feb 2024 at 7:27am
Possibly the traction booster is stuck not permitting oil to flow?
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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 20184 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 29 Feb 2024 at 7:50am
Is this a "gear" type pump??? or one similar to a model "CA" or "WD" tractor ??
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Macon Rounds View Drop Down
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Joined: 18 Feb 2010
Location: Pittsburgh Pa
Points: 2116 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Macon Rounds Quote  Post ReplyReply Direct Link To This Post Posted: 29 Feb 2024 at 7:52am
I had one of those pumps that was worn badly and it pumped the oil past its drive shaft back into rear housing of the tractor.
The Allis "D" Series Tractors, Gravely Walk behind Tractors, Cowboy Action Shooting !!!!!!! And Checkmate
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Fred in Pa View Drop Down
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Joined: 13 Sep 2009
Location: Hanover Pa.
Points: 9189 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Fred in Pa Quote  Post ReplyReply Direct Link To This Post Posted: 29 Feb 2024 at 7:59am
If its the gear pump on rear of housing ,check pressure with a flowmeter  directly off pump  this tells u what pump is doing before relief valve .If its this pump make sure suction screen is clean on pick up tube.

Edited by Fred in Pa - 29 Feb 2024 at 8:04am
He who dies with the most toys is,
nonetheless ,still dead.
If all else fails ,Read all that is PRINTED.
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Showboat six View Drop Down
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Joined: 28 Feb 2024
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Points: 3 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Showboat six Quote  Post ReplyReply Direct Link To This Post Posted: 29 Feb 2024 at 8:07am
It’s the 4 plunger pump, is there any special priming process for them?
I get a slow oil flow out of the ramp hose when loosened, but no high pressure.
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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 20184 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 29 Feb 2024 at 8:17am
Fill compartment with oil---self priming.   Screw "D" must be clear OUT.
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