Page 1 of 3
TCV adjustment
Posted: Sun Mar 19, 2023 12:43 pm
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?
Harry
Re: TCV adjustment
Posted: Sun Mar 19, 2023 1:06 pm
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?
Harry
Harry,
I may be wrong, but I seem to remember that you use a hex bit on that one.
Bob
Re: TCV adjustment
Posted: Sun Mar 19, 2023 1:20 pm
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.
Harry
Re: TCV adjustment
Posted: Sun Mar 19, 2023 1:46 pm
by DavidBarkey
Is it possible that the PO had it apart and put the screw in backwards ?
Re: TCV adjustment
Posted: Sun Mar 19, 2023 1:53 pm
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.
Harry
Re: TCV adjustment
Posted: Sun Mar 19, 2023 3:29 pm
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
Re: TCV adjustment
Posted: Sun Mar 19, 2023 5:38 pm
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.
Harry
Re: TCV adjustment
Posted: Sun Mar 19, 2023 5:58 pm
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.
Harry
Re: TCV adjustment
Posted: Sun Mar 19, 2023 6:40 pm
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.
Re: TCV adjustment
Posted: Sun Mar 19, 2023 7:47 pm
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
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.