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What a $20 part does...

D

Don-Wi

Well-known Member
Dad's JD 425 lawn tractor (I use it for my lawn too) has been stumbling on & off every now & then for the last year. It would recover and be fine the rest of the time cutting. The last 2 weeks it was getting worse, and then to the point where it would run 10-15 minutes and quit. Had to let it cool down and then it's do the same thing.

Asked over on the L&G board, and then did some looking in the archives, and got cued into the $20 part that turned out to actually be the problem. Was a TDM (Time Delay Module) that's job is to let it run 5 seconds after you turn the key off. Apparantly a very common problem with the 425/445/455 tractors.

Replaced it yesterday while it was raining outside, and then was able to finish cutting my lawn today. Ran better than it has in a while, and all because a $20 part was going bad...

Donovan from Wisconsin
 
OK, but I'm confused. What is the purpose of letting it run for 5 seconds? I'm having trouble seeing the point of it.
 
(quoted from post at 20:56:37 05/08/10) OK, but I'm confused. What is the purpose of letting it run for 5 seconds? I'm having trouble seeing the point of it.
Click to expand...
o sell you a $20 part?

OK, here is a WAG......it has a safety switch that turns engine off the engine when you butt leaves the seat, right? So do you want it to kill the engine when you scratch, re-adjust your equipment, or hit a bump?
 
Might i ask---did that part hold the fuel bowl onto the carburetor?
A lot of the newer Briggs engines have a fuel shut-off valve on the bottom of the carb. What it does is this: With the newer fuels, and controls, it solves the loud BANG heard several seconds after you turn off the ignition, the BANG that scares the bejabbers out of the operator when he, or she (don't want to hurt any feelings here, nor get the guvment mad at my insensitivity) turns off the ignition key! It allows any unburned fuel in the carb throat to the engine, to be used up, and keeps any more fuel from flowing into the carb, or intake manifold, which here to fore caused the loud BANG!!
The older engines didn't do that, but since the all-knowing guvment got their hands into most everything, they caused the BANGS!
And, $20 sounds cheap! Last time i priced one, the place wanted $85 for it! I didn't buy it.
 
If I have to lift my but off the seat to scratch, Im going to shut it down and go in the house to see whats making me SCRATCH.
 
It keeps the engine from doing the back-fire report, that usually scares the pants off the unsuspecting operator, wakes up the kid your wife just got to sleep after rocking it for 2 hours, or makes your prize goat take off at a run, ending up 2 counties away!
 
I mow a widow lady's yard with her 345 and it runs a few seconds too after turning off the key, I never knew why it was set up that way. Sounds like another complication to go wrong.
 
Can't say I know why it does or why it's important, but the old one I took off was square and the new one was round. Made finding it a bit difficult when the wires coming out of it were covered in dust so I couldn't see the colors, and I was expecting to find exactly what was in the parts bag....

After a call back to the dealer to ask where the heck it was, the service guy said it could be either square or round, close to the engine, etc. etc. etc..... I went to the house, got my headlight, and took a closer look. That's when I noticed the colors of the dirty wires. It was near the starter, with one wire attatched to the battery cable lug on the starter itself.

I've been fairly surprised with the overall decent prices on parts for it so far. A new set of blades was around $70 for 3 blades on the 60" deck, and the wheels on the same deck didn't seem too bad either.

Hopefully this one lasts just as long as the first mysterious black box.
 
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