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.