276D Powershift problem

[silvertramp]

Hello, I have a Yanmar 276D and recently the Powershift transmission hasn't been engaging firmly. The loader and 3pt hitch work normally. There was 300 hours and 7 years on the transmission fluid. I replaced the fluid and hydraulic filter with the same brands that were in it. I also installed a new screen filter because I damaged the old one. The filter looked clean and the hydraulic fluid was not milky. The clutch is adjusted properly and I can shift threw the transmission ranges normally.
The Powershift is still not engaging properly. If it won't engage properly, I can shift from first to reverse, or vice versa, to get a positive engagement.
Is my next step to inspect the relief valve spring? My manual is not detailed enough to show it. Does anyone have a diagram? Any help would be greatly appreciated.

 

[winston1]

Are you confident your linkage is tight and properly adjusted? Sending you a pm.

 

[silvertramp]

I think the linkage is adjusted correctly. I don't have a good manual, so I'm just winging it. The problem is in both forward and reverse. I'm assuming that if I lengthen/shorten the linkage that I will make forward or reverse worse. The column linkage is tight and moves the lever on the transmission.

 

[normde2001]

What do you mean by "engaging properly"? What does it do otherwise? Bad relief valve springs cause lack of movement or delayed movement, no bearing on engagement.

 

[silvertramp]

What do you mean by "engaging properly"? What does it do otherwise? Bad relief valve springs cause lack of movement or delayed movement, no bearing on engagement.

Same symtoms as a slipping clutch. If I shift from forward to reverse, or vise versa, it will lock up and I'll be good to go. I haven't moved it much since the problem started.

 

[winston1]

Are you sure the clutch is not slipping? The lower the gear the less the slippage. Does the pto have good power?

 

[silvertramp]

I should have tried the PTO when the rotary mover was on it. I did not. The 3 pt. hitch and loader work normally.
Could be the clutch, but I don't think so. There's plenty of free play in the pedal. The problem came on suddenly, with no warning.

 

[normde2001]

You have not yet checked the relief valve spring?

 

[silvertramp]

I'm having trouble getting to it. I have removed the shifter linkage and the shifter cover. I think the piece below that is called the regulator case. I can't seem to budge it with a dead blow hammer.

 

[winston1]

I'm having trouble getting to it. I have removed the shifter linkage and the shifter cover. I think the piece below that is called the regulator case. I can't seem to budge it with a dead blow hammer.

The cover has spring pins (dowel pins) and will have to come straight up.

 

[silvertramp]

I found the problem The large delay relief spring is broken into 4 pieces. Any idea where I could buy one?

 

[Todd8665]

I found the problem The large delay relief spring is broken into 4 pieces. Any idea where I could buy one?

Nope, But i sure am interested in where to source these. Feel my time may someday come.

 

[Todd8665]

I've thought about this before and given the specs of the spring a place like this might be able to provide...

Item # CUSTOM COMP. SPRING, Custom Compression Springs On Murphy & Read Spring Mfg. Co., Inc.

 

[silvertramp]

Nope, But i sure am interested in where to source these. Feel my time may someday come.

I ordered the springs thru dieseltractorparts.com

 

[winston1]

Is this the correct part number? https://www.google.com/search?q=194..._en&ie=UTF-8&oe=UTF-8&sourceid=ie7&gws_rd=ssl

 

[silvertramp]

Is this the correct part number? https://www.google.com/search?q=194..._en&ie=UTF-8&oe=UTF-8&sourceid=ie7&gws_rd=ssl

The upper number is the one I have. 194446-24540.
Thanks for all the help. I could not have accomplished this without this forum.

 

[kenmac]

Hoye also list that part # for 24.50..Hope you get it fixed...Let us know how it works

 

[silvertramp]

Well, I installed 2 new springs today.If anything it's worse than before. I suppose that I could've installed the shifter forks onto the piston wrong. It's dark now, so it'll have to wait for tomorrow. I had to use a small bar clamp to compress the spring assembly enough to get the bolts on the diamond shaped cover plate started. Is that normal?

 

[winston1]

Never been there but it sure doesn't sound normal to me.

 

[silvertramp]

I assembled the spring mechanism several times with the same results. I had to put pressure on the cover in order to seat the sleeve.