190 power director stuck in low
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=102052
Printed Date: 09 Sep 2025 at 8:28pm
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Topic: 190 power director stuck in low
Posted By: screwylouie010
Subject: 190 power director stuck in low
Date Posted: 16 Feb 2015 at 5:41pm
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so over the summer i rebuilt the power director in my project 190.most of the friction disc came out in pieces when i tool it part. the front housing was pretty well worn and some of the steels were warped. i got a housing, some steel disc and some friction disc used from sandy lake and got the rest of the friction disc and all seals, orings and gaskets new. i cleaned everything up, made sure all disc were not warped and assembled the power director. when it came tile to sliding the tractor back together it gave me a bit of a hard time. got it to about the last inch and would not go any further so i gave up for a few days. came back messed with it some more and was able to pull it together with the bolts, using just 1 hand on the the wrench going easy. got it all together, everything hooked up and filled up. fired the engine up, ran it a few mins with the clutch in and then let it out. didn't hear any weird noises or vibration, engine didn't bog. so i shifted the power director into low, no changes, then i shifted it into and the engine bogged down. i put it back into neutral. so i put the trans into gear and let the clutch out and the tractor drove ahead as if it was in low. i stepped on the brakes as hard as i could and the engine bogged down but kept moving. i shifted it into low and it kept going the same speed. then i shifted it into high and the engine bogged and the tractor still moved at low speed. i put the pressure gauges on the pd valve and pressures are correct for the corresponding lever position and ports. i backed it back into its place and haven't touched it since. anyone have an idea whats going on. did i mess something up rebuilding the power director or when i put it back together. that's the only thing i had to kind force together and it didn't go all that hard. i did this by myself with a bottle jack and a floor jack. any thoughts or ideas are appreciated.thank you
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Replies:
Posted By: AC200Puller
Date Posted: 16 Feb 2015 at 6:28pm
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Number one. Never force it together roll the engine till it falls together. Number two did you have the pistons turned the right way when you put them back in ?
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Posted By: screwylouie010
Date Posted: 16 Feb 2015 at 6:45pm
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i know well enough to not force it but it was pissing me off and used a little persuasion i turned the engine over probably 100 times both directions.ive split quite a few tractors and thid is the only 1 that has given me a problem. for the piston. im thinking to my self here, well yea they only go 1 way, but then again im thinking you know something that i don't. do they have to be clocked a certain way?
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Posted By: DiyDave
Date Posted: 16 Feb 2015 at 8:20pm
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Might also not be shimmed right. Also if it's put together out of a mix and match of parts, you could have one face that's wore different.
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Posted By: screwylouie010
Date Posted: 16 Feb 2015 at 8:39pm
all the parts in the clutch pack went together easy and all plates where free/ loose once assembled completely. there are no shims that i am aware of
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Posted By: AC200Puller
Date Posted: 16 Feb 2015 at 11:17pm
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If you have the style of pistons in there that are not connected to the plate then yes they can be wrong ,the seal ring has to go to the bottom of the housing. I have seen where they are turned the wrong way and the piston will push out beyond the point of the seal ring and not work.
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Posted By: screwylouie010
Date Posted: 17 Feb 2015 at 7:51am
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if i remember correctly the pistons would only go in 1 way. no way to put them in wrong
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Posted By: AC200Puller
Date Posted: 17 Feb 2015 at 8:37am
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Not sure what is wrong but the low side sounds like it is engaged all the time and when you put it in high they are fighting each other. I always bench test them with air before putting them in.
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Posted By: nevans
Date Posted: 17 Feb 2015 at 9:12am
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your p.d. valve could have a crack in it that is putting pressure on both sides or the plunger could be bent just a couple of things to check Niel
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Posted By: screwylouie010
Date Posted: 17 Feb 2015 at 10:37am
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Would that be able to be detected with pressure gauges on the ports on the valve. Both ports were near zero in neutral. When put into high or low onle 1 gauge jumped up each time. Other stayed near zero.
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Posted By: DrAllis
Date Posted: 17 Feb 2015 at 1:15pm
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The large bronze bushing in the front (low range) housing was too small of I.D. and is stuck onto the hollow shaft, causing low range all the time. Mixing and matching used parts and not checking the fit can cause this scenario. If this bushing was replaced with new, that's your problem as it needs to be "sized" after installation in the housing.
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Posted By: screwylouie010
Date Posted: 17 Feb 2015 at 2:45pm
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That's got to be the problem now that you say it, I did replace that bushing . Thank you drallis. I kinda thought about that when I first had the problem putting it together but I guess it completely slipped my mind. Guess ill be pulling it back apart when the weather warms up. Ill let you guys know how it goes. Thank you again guys
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Posted By: tbran
Date Posted: 17 Feb 2015 at 8:57pm
there are two ways to learn - do it twice after asking Doc what happened, or it is a really good idea to put an eyeball on a AC service manual - where this is spelled out. I am not chiding you, but for all who read the post use it as a learning experience. There are so many small issues like this that are overlooked that cost big bucks. I talk to our guys almost daily about this, and sometime I think I know all about a system - and bang, make a mistake that could have been avoided. Preachers study the bible all their careers , but never go to the pulpit with out one - but I will tackle a powershift with the service book on the shelf......... the unpardonable sin.... :-)
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When told "it's not the money,it's the principle", remember, it's always the money..
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Posted By: SteveM C/IL
Date Posted: 17 Feb 2015 at 9:07pm
Posted By: screwylouie010
Date Posted: 17 Feb 2015 at 9:15pm
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an AC service manual would have been a great help, but i only have an I&T manual, actually only checked that a couple times through out the process.
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