Allis Chalmers 185 PTO clutch
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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=164425
Printed Date: 21 Aug 2025 at 1:33am
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Topic: Allis Chalmers 185 PTO clutch
Posted By: Buckyman
Subject: Allis Chalmers 185 PTO clutch
Date Posted: 18 Sep 2019 at 1:41pm
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My dad has an AC 185 that has had the PTO clutch break go out and we both have no idea what to do but we would really like to try to make the fix ourselves if we can. The biggest issue is that we don't know where it is and what it looks like...I've been able to read some other posts and have a really good idea what it will look like but if anyone can help us figure it out that would be wonderful. I tried looking on YouTube for some videos that could help with no luck. I'm assuming a break pad will need replacing as the pistons would seem to be less likely the cause based on what I've read so far. Any thoughts??
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Replies:
Posted By: DougG
Date Posted: 18 Sep 2019 at 6:39pm
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It probably is the pto brake pad that failed, its a small square that get stuck in place,,it is the front of the Powerdirector,,with hyd lines attatched ill try to get some pics of where it is ,
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Posted By: Joe(TX)
Date Posted: 18 Sep 2019 at 6:59pm
You can look at the parts breakdown in agcopartsbook.com The piston can be removed from the front of the pto drive housing without removing the housing, It is spring loaded. You might check to make sure the valve is shifting enough to actuate the brake.
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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
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Posted By: DrAllis
Date Posted: 18 Sep 2019 at 7:16pm
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Tractors with the 540/1000 PTO clutch had more issues with the brake than straight 540 units. There was a change made to the round brake pucks to make them more aggressive to help keep the PTO from creeping in cold weather. When I install new pucks I leave out the return springs and replace them with a pipe spacer as long as the spring is when fully collapsed. This insures that if the puck ever comes off, the piston can't eat into the clutch housing. Leaving out the springs helps make more brake squeeze pressure.
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Posted By: MACK
Date Posted: 18 Sep 2019 at 8:44pm
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Warped plates can also be the cause of break not working. MACK
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Posted By: allisbred
Date Posted: 18 Sep 2019 at 9:00pm
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Does the 185’s w540/1000 hydraulic PTO have a factory designed “neutral” like the 200? I have always just ran them in or out and that seems hard on the brake with an implement needing them repaired continually. I have seen others post for this repair as well. Sorry if I interrupted this thread.
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Posted By: DrAllis
Date Posted: 18 Sep 2019 at 9:02pm
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Yes, there is a neutral and some machines should be allowed to coast to a stop before applying the brake.
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