185 PTO hyd clutch brake
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=43153
Printed Date: 03 Sep 2025 at 6:25am
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Topic: 185 PTO hyd clutch brake
Posted By: Sam T-Ga
Subject: 185 PTO hyd clutch brake
Date Posted: 02 Jan 2012 at 4:05pm
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Do the brake pistons in the hyd pto clutch have a brake pad or brake material boneded to them? I am working on a 185. Pto won't stop turning, checked pressure-250psi. I can stop it with load on the shaft, but brake won't hold. Pulled one piston out, orings look good no brake material on end of piston. Picture in service manual looks like a brake pad on end of piston.
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Replies:
Posted By: Burgie
Date Posted: 02 Jan 2012 at 4:38pm
You are right on.
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"Burgie"
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Posted By: Sam T-Ga
Date Posted: 02 Jan 2012 at 4:44pm
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So I quess I need to replace brake pistons. AGCO will probally want a tractor payment for them.
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Posted By: Burgie
Date Posted: 02 Jan 2012 at 4:50pm
Yeah, they probally will. Sometimes you get suprised.
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"Burgie"
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Posted By: DrAllis
Date Posted: 02 Jan 2012 at 5:19pm
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AGCO had a service bulletin years ago that recomended removing the return spring from each brake piston to make the PTO brake more effective. The downside of that is, that IF the brake pad comes off (like yours did) and the spring missing, the piston will still stroke farther than it should and rub metal to metal and ruin the rotating clutch housing inside. If you choose to eliminate the spring, I'd recomend squeezing the spring collasped in a vise and use a torch on two sides to heat the wire red and let it cool. Then install it like normal and you've lost the spring pressure but still have the coils for a depth stop. Tractors equipped with 540/1000 pto have more PTO brake issues than straight 540 tractors because the clutch is spinning faster and makes it harder to stop.
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Posted By: MACK
Date Posted: 03 Jan 2012 at 8:32am
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The most cause for worn brake pads are worped clutch seperator plates or trying to stop a load. MACK
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Posted By: DanD
Date Posted: 03 Jan 2012 at 8:53am
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When shutting down a PTO driven implement with no over running clutch (a blower for example) we always just pulled the PTO lever about half way off. This disengages the PTO, but doesn't apply the brake. Let the implement come to a stop, then pull the lever all the way down. Doesn't wear the brake that way. We've always done this with our 185 and the PTO and brake work like new so far!
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Posted By: DougG
Date Posted: 03 Jan 2012 at 10:37am
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Thats the only way to do it , half way , then when the implement stops apply brake
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Posted By: Sam T-Ga
Date Posted: 03 Jan 2012 at 3:45pm
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Priced brake pistons today, they will be over $200 each after ups charge. We bought this 180 used and the pto would slip, I had a 185 parts tractor so I swapped pto clutch asy. the 185 clutch does not slip but with cold oil it won't stop turning. I may run till oil gets hot and see what happens. I also priced brake disc for 7000, over $400 for set of 4. Anyone know of aftermaket source for 7000 brake disc?
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Posted By: DougG
Date Posted: 03 Jan 2012 at 4:05pm
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Holy crap , thats alot of money for so little parts !! Aint rite !
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