Farm Equipment - 190XT Power Director

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190XT Power Director

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=205820
Printed Date: 13 Mar 2025 at 12:50am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: 190XT Power Director

Posted By: XTD301
Subject: 190XT Power Director
Date Posted: 11 Mar 2025 at 7:42pm

So here’s the story. I have a 67 190xt Diesel. I’ve always liked the 200 style power director handle, as I grew up with 3 of them. I switched the console last weekend. I adjusted the linkage properly, first with the 1.5” measurement and also checked with gauges. I have drag in neutral that I never had before. It loads the engine a lot. This weekend I removed the hydraulic pressure to the pd valve, and test ran. No drag, same as before. My gauges on the power director valve show 280 in high and low, and 40 in neutral, on both clutches. No matter where I wiggle the spool, it never goes below 40. Is 40 psi enough to make it drag? Could I have damaged the internal spool by moving it too far before I adjusted it? Last question, I have access to a late 200 pd valve. Besides the different external feed line, is there anything else that changed that prevents me from installing the later valve?

Replies:

Posted By: DrAllis
Date Posted: 11 Mar 2025 at 9:23pm

I guess until you re-check your clutch pressures with the hydraulic oil at operating temp (more than 150 degrees) I wouldn't lose one seconds sleep over what you have. The Low and High clutch pistons are connected together by springs and a linkage rod that return them to neutral. 40 psi on each piston cancels each other out...no movement. Cutting off all oil flow/supply to the P.D.valve eliminates lube oil flowing thru the clutch assembly which does cause viscous drag when the oil is below operating temp. As far as a later 200 valve assembly, I've had far more trouble with that valve than I ever did the old original style. The sliding spool pressure regulator is known for sticking versus the tapered poppet style that can't stick.

Posted By: XTD301
Date Posted: 12 Mar 2025 at 7:40pm

It just odd that it seems to have started dragging heavily after I switched levers. It never acted like this before. Even at cold start. Could just be coincidence, and something happened the last time I used it, I didn’t notice then. I will warm the oil with a loop hose in the remotes and try it again. I did measure the rod travel of the old linkage and the new. They both have the exact same travel. Do you know why they switched to the newer style pd valve? I was told that it created a smoother pd engagement. But that might be just hearsay. Thanks Dr.

Posted By: DrAllis
Date Posted: 12 Mar 2025 at 7:54pm

The new valve was introduced when they made changes to the PD clutch itself. Instead of both clutch pistons being tied together and moving together, the new 200 clutch had each piston separate so that shifting at full throttle under load, the oncoming clutch would hit before the releasing clutch would fully release, making it operate smoother under load.

Posted By: Alex09(WI)
Date Posted: 12 Mar 2025 at 11:34pm

Well explained Dr. Changing the lever should not have had an effect on the amount of drag in neutral. I believe the spec is 50psi or less in neutral. From my experience, the newer 200 4000+ valve has less pressure in the neutral position. But like Dr Allis said, it shouldn't affect the amount of clearance inside the clutch.

It is possible you broke a plate in the power director the same time you switched the lever. Pressures would be within spec, but clutch would drag in neutral and slip in 1 range under heavy load.

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