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AC 655 Shuttle Clutch |
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Randaleky
Silver Level Joined: 17 Aug 2011 Location: belfry, ky. Points: 423 |
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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
Silver Level Joined: 17 Aug 2011 Location: belfry, ky. Points: 423 |
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May need to take the shuttle shift valve apart to find problem . could be broken springs or gunked up.
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Mikeys250
Bronze Level Joined: 27 Sep 2019 Location: Juliette, Ga Points: 21 |
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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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Mikeys250
Bronze Level Joined: 27 Sep 2019 Location: Juliette, Ga Points: 21 |
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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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Tracy Martin TN
Orange Level Access Joined: 11 Sep 2009 Location: Gallatin,TN Points: 10551 |
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Blount used parts, Hoboken, GA. HTH Tracy
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No greater gift than healthy grandkids!
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NomoreJohnDeere
Silver Level Joined: 24 Jul 2017 Location: Missouri Ozarks Points: 308 |
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HD3
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Mikeys250
Bronze Level Joined: 27 Sep 2019 Location: Juliette, Ga Points: 21 |
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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
Silver Level Joined: 17 Aug 2011 Location: belfry, ky. Points: 423 |
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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
Bronze Level Joined: 19 Sep 2017 Location: West Virginia Points: 24 |
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I hate to tell you, yes.
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Mikeys250
Bronze Level Joined: 27 Sep 2019 Location: Juliette, Ga Points: 21 |
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So I’m gonna loose all the fluid when I do that correct?
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Big Jim
Bronze Level Joined: 19 Sep 2017 Location: West Virginia Points: 24 |
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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
Bronze Level Joined: 27 Sep 2019 Location: Juliette, Ga Points: 21 |
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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
Silver Level Joined: 17 Aug 2011 Location: belfry, ky. Points: 423 |
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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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Mikeys250
Bronze Level Joined: 27 Sep 2019 Location: Juliette, Ga Points: 21 |
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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
Bronze Level Joined: 19 Sep 2017 Location: West Virginia Points: 24 |
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the picture in the parts manual shows where it is.
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Randaleky
Silver Level Joined: 17 Aug 2011 Location: belfry, ky. Points: 423 |
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when the problem first happened after operating 30 minutes , did the hydraulics for the loader bucket loose its power ?
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Randaleky
Silver Level Joined: 17 Aug 2011 Location: belfry, ky. Points: 423 |
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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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Mikeys250
Bronze Level Joined: 27 Sep 2019 Location: Juliette, Ga Points: 21 |
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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
Silver Level Joined: 17 Aug 2011 Location: belfry, ky. Points: 423 |
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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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Mikeys250
Bronze Level Joined: 27 Sep 2019 Location: Juliette, Ga Points: 21 |
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Which picture?
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Big Jim
Bronze Level Joined: 19 Sep 2017 Location: West Virginia Points: 24 |
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The picture shows you how to get to the screen.
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Mikeys250
Bronze Level Joined: 27 Sep 2019 Location: Juliette, Ga Points: 21 |
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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
Bronze Level Joined: 19 Sep 2017 Location: West Virginia Points: 24 |
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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
Bronze Level Joined: 27 Sep 2019 Location: Juliette, Ga Points: 21 |
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And one more thing. I can’t find the screen anywhere in this system. Where is it?
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Mikeys250
Bronze Level Joined: 27 Sep 2019 Location: Juliette, Ga Points: 21 |
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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
Silver Level Joined: 17 Aug 2011 Location: belfry, ky. Points: 423 |
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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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Mikeys250
Bronze Level Joined: 27 Sep 2019 Location: Juliette, Ga Points: 21 |
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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
Silver Level Joined: 17 Aug 2011 Location: belfry, ky. Points: 423 |
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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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Mikeys250
Bronze Level Joined: 27 Sep 2019 Location: Juliette, Ga Points: 21 |
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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
Silver Level Joined: 17 Aug 2011 Location: belfry, ky. Points: 423 |
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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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