U660 DELAY AND BANG INTO FORWARD

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transpck08
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U660 DELAY AND BANG INTO FORWARD

Post by transpck08 » Mon Apr 17, 2017 2:16 pm

This unit has a 3 second delay and then bangs into forward gear. Other than that, there is no issues at all. Shift flawless and reverse engagement is solid. I did install the sonnax oring end plugs and accumulators as they had signs on wear. Went thru the valve body very good when it was on the bench and no stuck valves whatsoever. Any ideas?
Last edited by transpck08 on Fri May 19, 2017 1:08 pm, edited 3 times in total.

transpck08
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Re: U660 DELAY AND BANG INTO FORWARD

Post by transpck08 » Mon Apr 17, 2017 2:55 pm

After looking at some past webinar sheet, looks like im going to have a valve body issue even though i vacuum test all critical bores and they all check at 20-22. I tried the reset and relearn and that didnt help at all.

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dhritsko
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Re: U660 DELAY AND BANG INTO FORWARD

Post by dhritsko » Mon Apr 17, 2017 2:59 pm

the primary PR valve or bore is the one I see mentioned . also the C1 clutch is coming on , maybe missed something there . The OWC is also holding , is it good ?
Dave Hritsko
Transtar Industries
Technical Service Manager

transpck08
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Re: U660 DELAY AND BANG INTO FORWARD

Post by transpck08 » Mon Apr 17, 2017 4:52 pm

Air tested the c1 drum and it applied at 30psi. Sprag is good and holding. I will try another valve body if not then i might have a c1 piston or drum issue.

transpck08
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Re: U660 DELAY AND BANG INTO FORWARD

Post by transpck08 » Tue Apr 18, 2017 5:04 pm

***UPDATE*** Installed different valve body and same thing. Drive excellent but the 3 second harsh delay in forward is whats killing me on this tranny. Im pretty lost here as what could it be. Air tested again the low/rev clutches, c1 & c2 and they're all solid. Cant here a leak

jb.stp
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Re: U660 DELAY AND BANG INTO FORWARD

Post by jb.stp » Wed Apr 19, 2017 10:38 am

Here's the complete circuit...

SL1 (C1) solenoid

drill N-D orf (.050") to .073"

clutch control valve stuck against spring

sequence valve stuck in mid-way position

Leak at c1 accu (not very likely)

gauge c1 pressure tap
(center plug on elevated tri-circuit from center of cover) and observe psi drop on N-D engage (testing for leak in cover or drum)

if bad...
air check C1 clutch thru case (remove VB) to reveal drum/cover/seal ring leaks

[ If you need help finding the N-D orf.. call me 850 545 2146 Dean Mason / TransLab ]

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Jaradwarren
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Re: U660 DELAY AND BANG INTO FORWARD

Post by Jaradwarren » Wed Apr 19, 2017 10:47 am

Dont forget to reset trans adapts. Some scan tool do work when doing this. Get to temp and relearn
Jarad Warren

transpck08
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Re: U660 DELAY AND BANG INTO FORWARD

Post by transpck08 » Wed Apr 19, 2017 3:40 pm

Reprogrammed with techstream as the software was out of date. No luck. Gave installing shop bad news that its internal and needs to come down. Ordering new pistons for c1 clutch

transpck08
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Re: U660 DELAY AND BANG INTO FORWARD ***FIXED**

Post by transpck08 » Mon Apr 24, 2017 6:56 pm

Order new Seal aftermarket hi-per blue piston kit. shop installed the unit and all is working good. Those darn cheap pistons can bite you in the as*

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Re: U660 DELAY AND BANG INTO FORWARD ***FIXED***

Post by transpck08 » Tue May 16, 2017 12:16 pm

So this unit is back after 1 week from me changing the bonded pistons again. This time it came in with a U0101 Lost communication with TCM. Tranny was working like a champ. Cleared code and came back after a couple of miles. Would not upshift and code couldnt be cleared. The following day i turn on the car and it has the delay in drive (3 seconds) with a harsh engagement. Electrical guy came and found dirty terminal pins. He cleaned them and erased the code. Drives good but the delay is still there. This unit is really kicking me in the butt. Worked fine for 11 months and now i cant get this thing to work like it should.

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