The Green Industry's Resource Center

mowerdave · #31 06-27-2007, 09:42 PM

My Walker is a 2002 model. Like I said, not much help from the dealer, but have gotten some pretty good answers on some stuff from their distributor down in Harrisonville MO. Good luck with your problems.

delmcleod · #32 06-24-2012, 11:00 AM

so years later... another MDD with the same problem. I have gone through and replaced 90% of the electronics on our cooling system and when you back the key up to heat the glow plugs, the fan SHOULD cycle through all its speeds. THe fan controller clicks like its cycling but the fan only comes on when the machine is overheating. No warning light or siren, just no operation from the fan below 235` and when it does turn on it doesnt cool the machine back down to normal operation temps. we replaced the relay(s) ceramic resistor, fan controller, fan itself... any other ideas??? when I tried to back track the wires on the fan back to the fan controller, i either couldnt trace them or they showed almost no impedence ( guage didnt bounce like it would if you touch the guage probes to themselves) but showed low current like when i tested the ceramic resistor... Help?

Its a 2007 MDD 48"

jrs.landscaping · #33 06-24-2012, 12:00 PM

Quote:

Originally Posted by delmcleod

so years later... another MDD with the same problem. I have gone through and replaced 90% of the electronics on our cooling system and when you back the key up to heat the glow plugs, the fan SHOULD cycle through all its speeds. THe fan controller clicks like its cycling but the fan only comes on when the machine is overheating. No warning light or siren, just no operation from the fan below 235` and when it does turn on it doesnt cool the machine back down to normal operation temps. we replaced the relay(s) ceramic resistor, fan controller, fan itself... any other ideas??? when I tried to back track the wires on the fan back to the fan controller, i either couldnt trace them or they showed almost no impedence ( guage didnt bounce like it would if you touch the guage probes to themselves) but showed low current like when i tested the ceramic resistor... Help?

Its a 2007 MDD 48"

is the fan motor bad? The fan should start to cycle whether you turn the key to "on" or reverse to cycle the glow plugs. Maybe the reason the fan kicks on is when it auto reverses making the fan run backwards when it is overheating. Ours reverse when the motor gets to high heat levels for a period of time, the fan wil go in reverse for 30 sec to clean the radiator and then return to spinning normally.

delmcleod · #34 06-24-2012, 04:46 PM

No replaced the fan, relay, white ceramic resistor, fan controller, traced connections between all these components and there is still something breaking the 'loop' so te fan only kicks on when the unit overheats. Doesn't stay on either... Doesn't come on with the key either way
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delmcleod · #35 06-24-2012, 04:50 PM

I'm hoping it's not the wiring harness...But I'd have to tear it all out to figure it out. Tried connectors: connecting, unconnecting, reconnecting, crossing fingers no power still
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jrs.landscaping · #36 06-24-2012, 07:27 PM

bad ground/bare wire rubbing somewhere?

delmcleod · #37 06-24-2012, 07:37 PM

That's what I was thinking, it's a tough one to find. I'm half tempted to replace the main wiring harness
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jrs.landscaping · #38 06-24-2012, 08:54 PM

It sounds dumb but check all of the nuts that hold the grounds in place. We thought we lost the fan/fuel pump out of our 99. Turns out a nut had backed off and wasn't giving a constant ground. It sucks to chase all the wires but it's cheaper than replacing all of your wiring.

Mowing Freak · #39 06-29-2012, 12:40 AM

My happiest day is when I turned the key on my new Grasshopper and retired my POC (piece of crap) Walker with low hours. My heating problem was related to the timing being off on the diesel engine. After they fixed it, it ran good for a while, then for whatever reason, heating problems returned. Oh well, don't have to worry with it now as it sits in the barn and gets used to mow my dads yard. Just about the only thing it's good for.....

electric · #40 07-01-2012, 06:27 AM

I have a newer diesel with only 117 hours on it and mowing a couple weeks ago it overheated. Took it to dealer (still under waranty) they said the fan control module was bad. Mower with it for an hour then it overheated. Called them, they said its probably a bad relay in the back so they gave me one. I replaced it and it's been fine. Operating tems are staying between 180 and 195ish. I mowed with it yesterday and it was 91 out the hottest it got was 195ish. So far it's ok.