Good day all,
I am having issues with my John Deere 3520 tractor. The tractor runs fine in forward, but has no reverse.
At first I thought it was a electrical problem, like the pots, or MFWD sensor, but after tracing all the connections down to the two solenoids, everything appears electrically fine. The tractor sees +12V to each forward and reverse solenoid. The solenoid see 4.7 ohms resistance across each, so it appears those too are fine.
However, the tractor does not switch to reverse. Is there another condition that needs to be met somewhere else for reverse to kick on? Does anyone have any diagrams or service manuals related to the HST unit? My understanding is its manufactured by Danfoss Sauer and requires the tractor to be split to service the unit in any way.
Thanks in advance for any assistance.
I am having issues with my John Deere 3520 tractor. The tractor runs fine in forward, but has no reverse.
At first I thought it was a electrical problem, like the pots, or MFWD sensor, but after tracing all the connections down to the two solenoids, everything appears electrically fine. The tractor sees +12V to each forward and reverse solenoid. The solenoid see 4.7 ohms resistance across each, so it appears those too are fine.
However, the tractor does not switch to reverse. Is there another condition that needs to be met somewhere else for reverse to kick on? Does anyone have any diagrams or service manuals related to the HST unit? My understanding is its manufactured by Danfoss Sauer and requires the tractor to be split to service the unit in any way.
Thanks in advance for any assistance.