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I was able to locate the PTO interlock switch located under the driver's seat "skin"...had to take 6 small bolts to take the seat off cab,3 bolts on the wheel well, and popped off the PTO rubber grip...then I had a good visual view of the interlock switch...from years of driving with a "rubber socket" in the linkage, the linkage bent and would not engage the switch when the PTO lever is in the PTO disengaged position...merely had to poxy a 1/8" small washer on the linkage "paddle" so it comes into contact with the switch when PTO is in the "off" position...PTO lever works great now and tractor now starts...looking back at this fix, could of also cut the PTO lever slot so it is longer...took about 2 hours to remove/reinstall seat and panel, and glue washer...let dry overnight and worked fine next day...care should be used when using poxy glue since you can risk it gluing the linkage joint ridgit or interferring with smooth linkage operation if the glue goes where it shouldn't.

TC55DA PTO does not disengage and therefore tractor will not start
New Holland Tractors
Replies 11 Post by mrdaveone

I have good news to report...it stopped raining in Harrisburg PA, and finally got the TC55DA started as follows:

1. Removed all the fuses from the fuse box since the inside of the fuse box was still pretty dusty and dirty.
2. Blew out all dirt and dust with compressed air.
3. Sprayed electric motor cleaner on the fuse box knife contacts and dried with compressed air.
4. Scrapped corrosion off fuses with a razor blade before reinstalling.

Lessons learned:
1. When I discovered fuses were corroded with white oxidation film and continuity readings were zero in allot of places on the fuses, I should have been more diligent to clean the fuses and fuse contacts!

2. Fuse box is poorly designed since it is not sealed to prevent dust and corrosion products from entering.

3. I would expect this is a chronic problem on all non-sealed New Holland Tractors that operate in a dusty environment (I know we normally use tractor to cut pasture grass, but it is also used to drag an outdoor horse riding ring which at times is very dusty).

Even though this catastrophic electrical system failure was not related to installing spray pump wire, it was merely coincidental; anyway, I decided to run the wire directly to the battery versus the alternator!

Thank you for your timely responses and sharing your tribal knowledge!

Best Regards,

Dave

TC55DA does not start after I tried to connect dc sprayer
New Holland Tractors
Replies 10 Post by mrdaveone