JD Time Delay Module / Electrical gurus.

[65specialk]

On my JD 755 it has a TDC. What is its function and would it cause a no start situation if it was defective???

 

[Mechanos]

If I'm reading the schematic properly... the TDCM is nothing more than a safety interlock for the PTO. Should not affect a no-start condition.

 

[65specialk]

My thoughts exactly. The dealer says my no -start problem is because of this???
Thanks Dave

 

[Willl]

If it's wired anything like my 790, it could most certainly cause a 'no start'.

Where are you guys seeing/finding this "schematic" ?

 

[Mechanos]

In the service manual.

 

[beenthere]

Will malfunction not allow the fuel solenoid to function on startup? That is where I thought it came into play.

 

[kuboman]

Don't all engine functions go through the TDM. Glow plugs etc? Older version of the PCM in modern vehicles.

 

[jd110]

The time delay module only affects pto operation on the 755 - or any of the other compact 55 series. If you come out of seat with pto engaged, it gives you a 1 - 2 second delay before it shuts off the pto. The engine keeps running. For a no start problem, if it doesn't crank over, the key switch sends power through the neutral start switch to the starter. In other words, the problem could be battery, cables, dirty connections, ignition switch, neutral switch, starter or wiring. If it cranks but won't start, you need to determine if the shut off solenoid is working. If not, then the solenoid could be bad or wiring from switch to the solenoid.

 

[Mechanos]

The time delay module only affects pto operation on the 755 - or any of the other compact 55 series. If you come out of seat with pto engaged, it gives you a 1 - 2 second delay before it shuts off the pto. The engine keeps running. For a no start problem, if it doesn't crank over, the key switch sends power through the neutral start switch to the starter. In other words, the problem could be battery, cables, dirty connections, ignition switch, neutral switch, starter or wiring. If it cranks but won't start, you need to determine if the shut off solenoid is working. If not, then the solenoid could be bad or wiring from switch to the solenoid.

Yep... one of the reasons those of us that have an x55 like it so much. Almost purely mechanical with non of that electronic crap. If you were so inclined, you could replace the electromagent on the PTO lever with a simple hard linkage. The only other non-mechanical item on the tractor is the fuel shut-off solenoid. If mine ever craps out, I'll probably set it up on a cable to operate the fuel shut-off.

 

[65specialk]

Willl, PM me your email and I will send you a PDF. for the 655 to 855. Shoiuld be similar. dholt@ne.rr.com

 

[caniac]

I only have a operators manual having trouble locating where the TDC is? PTO keeps working then goes off and doesn't work then its fine again. Wondering if the TDC is done as I did check on voltage at magnet and also I can pull up on switch and it works as soon as I sit on tractor it shuts off????

 

[beenthere]

TDC meaning Time Delay Control module....

From service manual..

 

[caniac]

Thanks for reply in step 2 where is that location side of tractor can't seem to locate?

 

[caniac]

Yes the Time Delay module I can't seem to see it ?

 

[beenthere]

I've been looking, but not finding. I would assume on or near the PTO engage lever/mechanism.

This older thread may help shed some light.
http://www.tractorbynet.com/forums/john-deere-owning-operating/114526-755-pto-clutch.html

 

[caniac]

I've been looking, but not finding. I would assume on or near the PTO engage lever/mechanism.

This older thread may help shed some light.
http://www.tractorbynet.com/forums/john-deere-owning-operating/114526-755-pto-clutch.html

Thanks for your replies I can't still seem to find the module ugh ! I will try again today to find it thanks!