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AC 655 Shuttle Clutch

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Randaleky View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Randaleky Quote  Post ReplyReply Direct Link To This Post Topic: AC 655 Shuttle Clutch
    Posted: 25 Oct 2019 at 10:54pm
or could be yet a problem in sump , lines , or even the filter . At least you know you can get pressure and clutches are ok.  Hang in there . 
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Randaleky View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Randaleky Quote  Post ReplyReply Direct Link To This Post Posted: 25 Oct 2019 at 10:47pm
May need to take the shuttle shift valve apart to find problem . could be broken springs or gunked up.
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Mikeys250 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mikeys250 Quote  Post ReplyReply Direct Link To This Post Posted: 25 Oct 2019 at 2:34pm
Correction. I had the pressure up. I took the gauge off and started working it. Strong when cold but I put the gauge back on and I’ve lost pressure again. Also have a whining sound coming from valve once hot. Maybe the relief is sticking?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mikeys250 Quote  Post ReplyReply Direct Link To This Post Posted: 25 Oct 2019 at 1:33pm
Well I got the pressure up to about 230psi finally. Found the sump clogged and the line comes from the pump to the winch control valve and I was loosing pressure somewhere in the winch or valve so I bypassed they winch valve completely. Now I have full power in reverse all the time and only full power forward until the fluid gets up to temp. Stumped again. I’m chasing my tail it feels like
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Tracy Martin TN Quote  Post ReplyReply Direct Link To This Post Posted: 10 Oct 2019 at 9:17pm
Blount used parts, Hoboken, GA. HTH Tracy
No greater gift than healthy grandkids!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote NomoreJohnDeere Quote  Post ReplyReply Direct Link To This Post Posted: 10 Oct 2019 at 8:30am
HD3
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mikeys250 Quote  Post ReplyReply Direct Link To This Post Posted: 09 Oct 2019 at 11:30am
Ok folks. I haven't made it the sump yet but I have another question yall might can help me with.

Does anybody know of a boneyard or anything that might have used loader buckets that will fit this tractor? Once I get it all running right I would like to put a 4 in 1 on it since its already plumbed for it.
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Randaleky View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Randaleky Quote  Post ReplyReply Direct Link To This Post Posted: 06 Oct 2019 at 9:27pm
should be a drain plug on bottom of torque tube . use a plastic drain pan to save the fluid .
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Big Jim View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Big Jim Quote  Post ReplyReply Direct Link To This Post Posted: 06 Oct 2019 at 6:33pm
I hate to tell you, yes.
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Mikeys250 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mikeys250 Quote  Post ReplyReply Direct Link To This Post Posted: 06 Oct 2019 at 6:20pm
So I’m gonna loose all the fluid when I do that correct?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Big Jim Quote  Post ReplyReply Direct Link To This Post Posted: 06 Oct 2019 at 6:06pm
If you go down the line to the rubber hose. The hose goes on the cover asy.
The cover is held on with 8- 5/6 bolts.                                          the screen is inside.
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Mikeys250 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mikeys250 Quote  Post ReplyReply Direct Link To This Post Posted: 06 Oct 2019 at 6:05pm
The way I’m looking at mine it looks like it’s either bolted to the bottom of the rear compartment or inside the compartment.
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Randaleky View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Randaleky Quote  Post ReplyReply Direct Link To This Post Posted: 06 Oct 2019 at 4:41pm
My parts manual for the HD4 shows the screen assembly to be in line just short of the bend in metal line where it turns down to the sump. My HD 4 dozer does not have a screen in the line . I think many screens were eliminated by the owners . Might be some type of screen in the tube attached to the sump pan.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mikeys250 Quote  Post ReplyReply Direct Link To This Post Posted: 06 Oct 2019 at 11:50am
No the loader hydraulics stay strong at all times.
I really think I’m gonna find this sump screen clogged and starving the pump for fluid. Since I had 150psi and I drained the fluid and I dropped to 50psi I think more settled on the screen when the fluid was drained.
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Big Jim View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Big Jim Quote  Post ReplyReply Direct Link To This Post Posted: 06 Oct 2019 at 11:15am
the picture in the parts manual shows where it is.
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Randaleky View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Randaleky Quote  Post ReplyReply Direct Link To This Post Posted: 05 Oct 2019 at 11:36pm
when the problem first happened after operating 30 minutes , did the hydraulics for the loader bucket loose its power ?
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Randaleky View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Randaleky Quote  Post ReplyReply Direct Link To This Post Posted: 05 Oct 2019 at 10:55pm
if you checked pressure at the filter and only got 60 then it appears like problem is back toward the pump. I an wondering if the back end of the pump which is for the convertor side is driven by a keyed shaft and the key could be sheared ? I will look it up on my parts book and see . this is stumping me also.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mikeys250 Quote  Post ReplyReply Direct Link To This Post Posted: 05 Oct 2019 at 8:52pm
Everything looked pretty clean except some signs of water in the ATF from the old cracked cap I believe. I actually cleaned the whole metal line from sump to pump and it wasn’t wet anywhere.
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Randaleky View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Randaleky Quote  Post ReplyReply Direct Link To This Post Posted: 05 Oct 2019 at 8:17pm
If you can not get pressure on the line at the filter there would be no way to get it at the shuttle valve. I still think the problem is between the pump and sump. could be a crack in the metal line from pump to sump ? is the convertor tube still full of ATF fluid ? The torque convertor holds several quarts itself. By the way how did the front filter look ? any metal or things that should not be there ?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mikeys250 Quote  Post ReplyReply Direct Link To This Post Posted: 05 Oct 2019 at 7:37pm
Which picture?
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Big Jim View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Big Jim Quote  Post ReplyReply Direct Link To This Post Posted: 05 Oct 2019 at 4:11pm
The picture shows you how to get to the screen.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mikeys250 Quote  Post ReplyReply Direct Link To This Post Posted: 05 Oct 2019 at 3:57pm
I have a digital copy of the parts manual. I think I should have said how to I get to the screen in the sump?
I think you may be right about something in the valve. The manual says if it’s only 50 psi is the relief valve but I’m tryong to get everything else clean before I get to it.
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Big Jim View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Big Jim Quote  Post ReplyReply Direct Link To This Post Posted: 05 Oct 2019 at 3:51pm
You said you had the service manual, but do you have the parts manual?
they are most times together. The parts manual show a brake down of this
sys on page 178 with the screen. I thinking your trouble maybe with the
relief valve or spring in the shuttle valve on page 188. If you do not
have these send me private message with your address and I will mail you copies.
                                               Jim
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Mikeys250 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mikeys250 Quote  Post ReplyReply Direct Link To This Post Posted: 05 Oct 2019 at 1:00pm
And one more thing. I can’t find the screen anywhere in this system. Where is it?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mikeys250 Quote  Post ReplyReply Direct Link To This Post Posted: 05 Oct 2019 at 11:49am
I’m officially stumped.
I changed both rubber boots at the sump and at the pump. Checked all my fittings in the system for leaks and I’m up to 60psi. I took my gauge off the tee and let it purge out for a second and didn’t get any air. It’s got ok flow but it’s not 250pei worth. I don’t know what to check now
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Randaleky View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Randaleky Quote  Post ReplyReply Direct Link To This Post Posted: 04 Oct 2019 at 10:12am
Yes if only we were closer we could get it fixed.   The line from pump under engine to the right side is for the hydraulics.   The line on the left side to sump is the suction line for the back end of pump that is for shuttle clutch you are checking.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mikeys250 Quote  Post ReplyReply Direct Link To This Post Posted: 04 Oct 2019 at 7:14am
Yes I got all clamps from the pump to the sump on both sides. I will try to crack a line tonight and see what happens.

What is the line that runs from the pump to the sump on the left side ?
what is the line that runs from the pump under the engine and to the back of the trans on the right side?

Randal if you were a little closer I would just haul it to you and we would get it figured out quick Im sure.
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Randaleky View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Randaleky Quote  Post ReplyReply Direct Link To This Post Posted: 03 Oct 2019 at 2:52pm
sounds good . were you able to get all the way down to the sump connection ? I do not believe you have a serious problem . Might take line coming from the filter to the shuttle valve loose and put it into the location where you add fluid for the torque tube. start it up on idle and see if you get any air out of the system. You may want to let it pump into 2 gal. jug or bigger. the convertor fill tube may not take it fast enough.     just a thought.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mikeys250 Quote  Post ReplyReply Direct Link To This Post Posted: 03 Oct 2019 at 7:46am
I will check the line coming from the filter.

Also I tightened the clamps on the rubber boots at the pump and at the converter tube. I cleaned them up and checked them best I could without removing them and they seemed to be intact. I didn't want to remove them and break the seal if there was one.

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Randaleky View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Randaleky Quote  Post ReplyReply Direct Link To This Post Posted: 02 Oct 2019 at 10:17pm
you could put a pipe t in the line coming out of the filter that goes to the shuttle valve. insert the pressure gauge to see if pressure is 150 or more. if not check back toward the pump which is fed from the sump line . there is supposed to be a screen in the line from the pump to the convertor tube. did you find hose that connects to the shuttle sump located at the convertor tube. there are clamps there also. sometimes the rubber hose over the metal sleeve at the sump gets rotten and allows air to suck into the system. tough location especially on the loaders.
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