Farm Equipment - PTO brake question

PTO brake question

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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=186895
Printed Date: 19 Aug 2025 at 9:26am
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Topic: PTO brake question

Posted By: John m
Subject: PTO brake question
Date Posted: 08 Mar 2022 at 8:43am

I've got an early 190xt #7229. It has a pto clutch. On the control console the lever has three positions, engage, disengage and brake. What goes on when you put it in brake position? Is there brake bands somewhere that I'm not seeing? There is the clutch pack attached to the underside of the torque housing but I see no brake assembly. Just curious, thanks, John

Replies:

Posted By: MACK
Date Posted: 08 Mar 2022 at 8:50am

There is three lines going into front of that housing. One is for pressure to engage clutch. The other two are for brake. There are two pistons that push on front of clutch housing to stop rotation. MACK

Posted By: John m
Date Posted: 08 Mar 2022 at 12:08pm

Well glad I asked. I was thinking there would be a brake band somewhere similar to the brake pads and discs. It makes sense now, thanks, John

Posted By: AC720Man
Date Posted: 09 Mar 2022 at 6:05pm

Mack, my brothers XT pto doesn’t come to a complete stop. How do you fix that since it’s hydraulic stop?

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1968 B-208, 1976 720 (2 of them)Danco brush hog, single bottom plow,52" snow thrower, belly mower,rear tine tiller, rear blade, front blade, 57"sickle bar,1983 917 hydro, 1968 7hp sno-bee, 1968 190XTD

Posted By: John m
Date Posted: 09 Mar 2022 at 6:16pm

That's a good question? Mine didn't seem to do anything in the brake position. I have it off right now and visual looks like all the plates and clutches are new. Wouldn't want to take it back off cause the darn thing is heavy. Two man job to get the dowels back in along with the bolts. Drop that bad boy something is going to break, fingers, hand or head. Maybe there's another disc I can't see that's bad. Be good to fix it while it's off.

Posted By: DougG
Date Posted: 09 Mar 2022 at 7:52pm

Theres a brake stop Puck - that needs to be glued on a spot to stop the turning-

Posted By: John m
Date Posted: 09 Mar 2022 at 7:53pm

I better dug deeper into the manual and check the parts book. Thanks, John

Posted By: MACK
Date Posted: 09 Mar 2022 at 8:49pm

Could have some warped plates or lining worn off ends of brake pistons. MACK.

Posted By: KJCHRIS
Date Posted: 10 Mar 2022 at 12:48am

IF the PTO brake is same as 180, 185 & 200 and it should be. You need;

These are old A C numbers.

2 - 244467 Piston, brake. Brake material is bonded to piston

2 - 242907 O ring, piston.

2 - 923577 O ring, plug. 3 of these if you also remove center plug.

also may want

2 - 242913 O ring, torque housing sleeve. ( adapter that sets between PTO housing and Torque Tube. On several of mine was the puddle under clutch & PTO area. ).

You need quite a bit of patience getting the snap rings holding plugs out and back in. IF you find a spring in with the piston, service manual says they can be left out.

For assembly there's NO gasket between PTO Housing & Torque Tube, use Permatex Aviation Sealer.

I really didn't think the piston material was worn off enough to not work, but with new pistons and O rings, BUT the brake worked when done on my first 1. I'm not sure if piston was needed or just new O rings. Have fun be safe.

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AC 200, CAH, AC185D bareback, AC 180D bareback, D17 III, WF. D17 Blackbar grill, NF. D15 SFW. Case 1175 CAH, Bobcat 543B,

Posted By: DrAllis
Date Posted: 10 Mar 2022 at 6:37am

Leaving out the piston return springs definitely helps the brakes holding power. But, if the friction material ever comes off of the end of the piston (yes it happens) the piston will then stroke forward enough to grind away the end of the rotating clutch housing. So, I always made a piece of pipe machined to the length of a fully compressed spring you're throwing away to prevent this event from happening. An observation on this PTO brake: It seems to me that tractors equipped with 540/1000 PTO always have more issues with a weak creeping brake. I feel that is because the PTO gearing is changed to 1000 RPM in the clutch box, spinning the clutch twice as fast and making the brake work much harder to keep things stopped. All 540/1000 set-ups are 1000 in front and then reduced down to 540 in the lift arm housing.