7710 dual power or lack of it...

dieselpup

Member
Well finally got the 7710 back together after working on it over the winter. The pto clutch had been forced together resulting in bent clutch plates, damaged seal rings and messed up snap rings on the shaft to the reduction gears. All that is fixed, or at least better than the last guy did!
But now the dual power won"t shift. Worked fine when I pulled it out of the shop. Started it later and worked only for a few minutes since. 12.25 volts to the solenoid, 140psi (manual says it should be 150) on the gage but it did not change when shift the switch. Pto drops the gauge but comes right back up and 4wd raises it 7# or so. Any thoughts. So close to being done, but so far away...
 
If the gauge did not flicker when you made the shift, and you are certain that there is 12 volts at the solenoid in the high range only, then I'm going to say that your solenoid is bad.

Take a meter and measure the resistance of the solenoid coil. If your meter says OL or infinite or something along those lines, you have a bad solenoid coil.
 
I'll check resistance between solenoid wire and ground strap - shoulda thought of that. Had the meter right there. If that proves to be the trouble is there any way to get that out without splitting. And would there be harm from running it on the low side only in the short term? Really need to get some litter moved soon. Thanks.
 
Yes, the solenoid and valve come out as an assembly from a cover on the RH side of the transmission case.

No, it will not hurt to leave it run in low range.
 

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