TCV adjustment

Stuff about your Case, Colt, or Ingersoll tractor
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Harry United States of America
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TCV adjustment

Post by Harry »

I just changed the hydraulic oil on my 446 which is used only in the winter with a snow caster. The lift circuit has always made a squeal when lifting the caster. I’ve had this GT 30 plus years. I figured if I could tighten the adjustment screw a little the squeal would stop. After removing the lift adjustment screw cap I see the adjustment screw has no slot in it. I checked the travel adjustment screw and there is a slot in it. Has anyone ever seen an adjustment screw without a slot to turn it? :peace: Harry
1973 444, 1974 644, 1976 446, 1977 646, 1986 226
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Re: TCV adjustment

Post by myerslawnandgarden »

Harry wrote: Sun Mar 19, 2023 12:43 pm I just changed the hydraulic oil on my 446 which is used only in the winter with a snow caster. The lift circuit has always made a squeal when lifting the caster. I’ve had this GT 30 plus years. I figured if I could tighten the adjustment screw a little the squeal would stop. After removing the lift adjustment screw cap I see the adjustment screw has no slot in it. I checked the travel adjustment screw and there is a slot in it. Has anyone ever seen an adjustment screw without a slot to turn it? :peace: Harry
Harry,

I may be wrong, but I seem to remember that you use a hex bit on that one.

Bob
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Harry United States of America
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Re: TCV adjustment

Post by Harry »

Thanks for the reply Bob. The adjustment screw cap threads unto the adjustment screw. It’s a threaded round screw more like a fine thread 7/16” bolt. :peace: Harry
1973 444, 1974 644, 1976 446, 1977 646, 1986 226
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DavidBarkey Canada
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Re: TCV adjustment

Post by DavidBarkey »

Is it possible that the PO had it apart and put the screw in backwards ?
Dave
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Harry United States of America
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Re: TCV adjustment

Post by Harry »

When you bring in PO’s into the equation anything is possible David. I’m not sure how I could even get it out without buggering up the threads. I was thinking of double nutting the screw, but only about 3/8” is out side the valve body. As you know it’s in a very difficult area to maneuver. :peace: Harry
1973 444, 1974 644, 1976 446, 1977 646, 1986 226
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Re: TCV adjustment

Post by thebuildist »

with the spring pressure against it, it's only a little bit beyond finger tight as far as moving it. Perhaps you can get a good condition pair of needle nose or bent angle needle nose pliers on it?

Or one of those tiny cute little sets of channel locks?

Bob
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Harry United States of America
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Re: TCV adjustment

Post by Harry »

Thanks for your reply Bob. I didn’t want to take it out and didn’t want to possibly cross thread the adjustment screw. Then I would have to take it out. I was afraid of the spring and ball coming out and losing the ball. Maybe if I jacked up the rear of the tractor, put it on jack stands, so it was pitched forward the ball and spring wouldn’t fall out. Just a thought. By the way Bob I do have two pairs of those cute little channel lock pliers. :peace: Harry
Last edited by Harry on Sun Mar 19, 2023 6:00 pm, edited 1 time in total.
1973 444, 1974 644, 1976 446, 1977 646, 1986 226
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Harry United States of America
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Re: TCV adjustment

Post by Harry »

I was thinking of taking a small air operated die grinder with a small 2” disc on it. Reach ip in this very small area and cut a small groove in the middle of the threaded bolt. The try running a die over the threads to chase off any burrs. With a S-shaped screw driver I have, try adjusting the bolt. The more I procrastinate this the more ideas I come up with. Suggestions are always welcomed. :peace: Harry
1973 444, 1974 644, 1976 446, 1977 646, 1986 226
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Re: TCV adjustment

Post by Spike188 »

@Harry I would give the die grinder idea a try. I have a Dremel with a 4ft whip which works for getting into tight places. grinding a slot in situations like this is my method of choice.
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Re: TCV adjustment

Post by Eugen »

Lots of good ideas. I have a TCV from a 446 out in the shed. I'll have a look later tonight after the kids :sleep: I find it very unusual to have an adjustment screw with no means of turning it. At the very least it should show signs of mutilation.
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