Sounds like a sticky relay or contactor, or even the throttle microswitches that control said relays and contactors.
--- On Mon, 10/11/10, Mike Finck <M Finck setterlin com> wrote:
From: Mike Finck <M Finck setterlin com>
Subject: (ET) speeds 5,6,7,8 E20
To: "elec-trak cosmos phy tufts edu" <elec-trak cosmos phy tufts edu>
Date: Monday, October 11, 2010, 11:26 AM
I need some diagnostic help!
I am unable to engage speeds 5,6,7,8 on serial number 26AE20DA. I can engage those speeds while in neutral or when the rear wheels are raised off the floor, but when moving across the driveway they will not, Field Weakening coil FW does remain energized (open). However, once, during a moment of frustration this weekend I stomped on the foot speed control repeatedly and the tractor unexpectedly leapt to life and away I went at 9 mph but when I had to let off because the driveway ended, I was back to not being able to engage higher speeds again.
Michael H. Finck
Email: m finck setterlin com
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