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Garden Tractors Discussion Forum

Craftsman 19.5 Turbo Twin Cylinder help...

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08-10-2004 20:48:20

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Folks, I was mowing two weekends ago on my 42"cut 6 speed I/C Platinum 19.5 HP Craftsman mower and everything was fine. This last weekend it would not turn over (although the battery tested fine) and I could get it to start by jumping the solenoid (took a fully charged car battery to do though)and depressing the clutch all the way. Here is the weird part, even with the mower in neutral and the PTO NOT engaged, everytime I take my foot off the clutch/brake the engine wants to die. If I try and engage the PTO the engine also wants to die. Anything I do besides sit on the mower with the clutch/brake fully guessed it, the mower wants to die. Any ideas? Like I said, last weekend it ran like a dream and now it won't work hardly at all. Model number is 917.270912 TIA

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Kevin (Oh)

08-18-2004 07:15:10

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 Re: Craftsman 19.5 Turbo Twin Cylinder help... in reply to Rudy, 08-10-2004 20:48:20  
Did you get the seat switch replaced and the machine running?

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Kevin (Oh)

08-12-2004 12:51:42

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 Re: Craftsman 19.5 Turbo Twin Cylinder help... in reply to Rudy, 08-10-2004 20:48:20  
I've reviewed the parts list and wiring diagram for the 917.270912. I can not find one for a 917.270912 TIA.

I can find no relay that tuke2 mentions. This model is wired almost identically to my 917.270821.

For the engine to start, the seat switch (normally open contact) must be closed and both safety interlock switches (brake and pto) must be open. Two circuits in the ignition switch must also be closed.

Since his engine starts, these functions must be working.

The seat switch is a dual contact switch, with both normally open and normally closed contacts. One set is used to ensure the seat is occupied when attempting to start the mower. The other is used to make sure the seat is occupied when either the pto is engaged or the clutch/brake is released in order to put the machine in motion and to ensure they both are disengaged when attempting to start.

If either the clutch/brake or pto interlock is closed and the normally closed contact on the seat switch is closed (it should be open when the seat is occupied) the ignition will be grounded and the engine will shut down.

Again, I believe the dual circuit seat switch is probably the culprit, unleass the "TIA" after the model number uses some special wiring scheme. It is most likely not the clutch/brake or pto safety interlock. There is an outside possibility that the ignition switch is bad.

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08-13-2004 08:19:36

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 Re: Craftsman 19.5 Turbo Twin Cylinder help... in reply to Kevin (Oh), 08-12-2004 12:51:42  
Thanks for the e-mail Kevin. As you might have guessed, I found no relay. The model number is the 917.270912...the TIA is short for "thanks in advance" Sorry for the confusion.
Just to make sure we are on the same page, yes I can start the engine by jumping the solenoid but not by just turning the key. I am sure the problem is electrical but not sure where to start replacing switches. This can get expensive going thru Sears. Just trying to determine what to replace first.

Thanks again

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08-12-2004 20:25:46

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 Re: Craftsman 19.5 Turbo Twin Cylinder help... in reply to Kevin (Oh), 08-12-2004 12:51:42  
Sorry, guys, but I was sure that was the problem. I too looked at the diagram for this particular model but found no relay like I described. Sears lists this as a 1999 model. Mine is a 2000 model. I guess there is a difference. The function of the relay on my GT is to open and close circuits so the mower can function with the blades engaged and someone on the seat. The reason I thought this was the problem is that when I had my initial problem I ordered a seat switch and it didn't help. When I then found the relay (which has six poles, two of which are a normally open switch) it tested bad. When I replaced it everything functioned as it should. Before I replaced the relay the tractor would start but would die when I let the clutch out. Again, sorry for the misinformation.

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08-11-2004 18:38:13

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 Re: Craftsman 19.5 Turbo Twin Cylinder help... in reply to Rudy, 08-10-2004 20:48:20  
Trust me on this one boys. I believe I know what the problem is. I have dealt with an identical problem twice now on my four-year old Craftsman. Look for a small relay attached to the ignition wires hanging near the steering column just on the inside of the dash. This relay is about a two inch cubicle shape. You can replace it with one from Sears or go to your local automotive store and buy one. They were a common item on some early model GM cars. This relay operates somewhat like a three-way switch in your house. Like I said, I have replaced mine twice now in four years. Each time I had left my mower out in the weather for a couple of days at a time. Evidently this is a weakness in the ignition system. A relay from your local automotive store is exactly the same thing as the one that comes on these tractors and is a heck of lot cheaper than ordering from Sears.

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08-11-2004 19:51:09

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 Re: Craftsman 19.5 Turbo Twin Cylinder help... in reply to tuke2, 08-11-2004 18:38:13  
tuke2, Thanks for the advice, sounds like that will be the culprit. I too left the mower out in the elements prior to the trouble starting. I'll replace this weekend and give it a try again. Thanks again for all of the advice!

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Kevin (Oh)

08-11-2004 06:37:45

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 Re: Craftsman 19.5 Turbo Twin Cylinder help... in reply to Rudy, 08-10-2004 20:48:20  
I have a similar mower, 917.270821 (hydrostatic drive). In looking at the schematic in my owners manual, it appears that the seat safety switch is the most likely culprit from the scenario you describe. The "pto" safety switch may also be bad, but I doubt it. This is a dual circuit switch, where both the normally open and normally closed functions are used. One circuit is used for starting and one is used for running. Test the switches no and nc fuctions, I'll bet that is it.

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08-11-2004 00:52:42

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 Re: Craftsman 19.5 Turbo Twin Cylinder help... in reply to Rudy, 08-10-2004 20:48:20  
You have a safety switch loose or gone bad,happens all the time on Sears mowers.First one to check is seat switch.

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