On Sun, 30 Jul 2006, Michael Neverdosky wrote:
I would replace the fuse holder that you tried to fix. Fuse holders are under high stress and are not easy to repair. Replacement is far more reliable.
I didn't actually "fix" the fuse holder, I bypassed it, putting in a new inline fuse holder, instead of using the original fuse holder. That part seems to be working fine now (after all, I can drive in reverse). I found a few posts in the archives from people who had similar problems - seems like either the forward/reverse relay or where it connects to card 1 (loose connection) are the most likely culprits. Need to figure out where the forward/reverse relay connects to card 1 - haven't had much luck finding where that's shown in the service manual. Also need to test the forward/reverse relay to see if it's toast. It definitely works fine going to reverse - how do they fail normally? It seems like when I try to go forward, I'm getting current in the armature of the drive motor, just no field. Looks like the forward/reverse relay controls the field for the drive motor, so that seems a plausible explanation.
Mike
michael On 7/30/06, Michael S Briggs <msbriggs alberti unh edu> wrote:Ok, another update - after letting it sit for a few minutes, I was able to get reverse to work, so I could back it around into the garage - forward's a no-go. When I put it in forward, I get power use up to yellow, but nothing happening. It may have been in this same state earlier today, when I thought it was fixed, since the first time I tried using forward was when it cut out and everything stopped working (because of how I had pushed it into the garage last night, I just backed it up out of the garage and onto the yard to start mowing). I'm thinking this is the forward/reverse relay? Hopefully? Of course, how does it explain the issue of keeping the PTO from working? Whatever's going on, whenever I try going forward, there's a substantial current draw - and if I try going forward while the blades are engaged, it seems to act as if it's temporarily tripped a circuit breaker (perhaps. I checked CB-1 though, and it's not tripping that one), since then the blades stop working, and reverse stops working. I ordered a couple spare 36V relays a few days ago (suspecting the forward/reverse relay of being the culprit of the intermittent non-working problem), so one should be here shortly to try out soon. Thanks, Mike --_______________________________________________ Elec-trak mailing list Elec-trak cosmos phy tufts edu https://cosmos.phy.tufts.edu/mailman/listinfo/elec-trak