The Jack's Small Engines Forum - Join Our Online Community
Jacks Small Engines Lawn Mower & Power Equipment Forums
Community Stats
1 day 7 days 30 days Max. View More
Birthdays
There is no record available at this moment
2017/09/20 20:56:32
Dan Lee

Toro Z4200 Zero Turn Mower Won't Start

I have a Toro Z4200 Zero Turn Mower. I was cutting my grass today, and got off the mower to move a garden hose. It idled for a while, then died. I got back on it and it wouldn't crank the motor with the keyswitch. I tried it with the blades engaged & disengaged. After a little trouble shooting, I replaced the starter Solenoid. That didn't fix the problem. I can get it to start by jumpering 12 V to the Solenoid, but when I use the keyswitch, it the Solenoid doesn't close, even though I can measure 12V on the start terminal. I believe that there is another lockout, other than the seat switch & blade engage, that I am not aware of.
 
I have checked the fuses. There is a Relay in the circuit that might have failed, but I don't know what it does.
 
I need a good schematic drawing of the electrical system, to determine what is preventing the Solenoid from closing.
3 comments Leave a comment
Mikel1
On starter solenoid there should be two small wires connected to the tabs. Disconnect the 12v feed wire, I believe it is a blue wire. Try to start normally while checking the vdc of this wire. The other small wire should be the ground.
Could also be one of the switches on the levers other than blade and seat switches.
2017/09/21 09:28:00
Dan Lee
I found a schematic on line and downloaded it. There is a DPST relay called a Kill Switch. I traced the problem to that, removed it, and jumped the terminals. The motor will start. I tested the relay and it operated fine. So I reinserted the relay, and the motor starts with the keyswitch. The relay must have been hung up. I got my grass cut, now I will look for a replacement relay, so it doesn't happen again.
The relay connects the low side of the solenoid coil to ground. The motor will not start with that connection open, even though there is voltage on the high side of the solenoid coil.
2017/09/21 11:11:15
Mikel1
Looks like I read it wrong where you jumped it, my mistake.
The green ground wire could have been ohmed to good ground for the ground connection.
Glad you got it figured out.
2017/09/21 12:09:50

Comments are closed.

Copyright © 1994 - 2016 Jacks Small Engine & Generator Service, LLC
© 2025 APG vNext Trial Version 5.5