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Electric Pto Clutches


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#1 Gabriel OFFLINE  

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Posted March 19, 2014 - 09:22 PM

Is there any good way to determine if a electric clutch is going bad? The one in question is not mine, but one of my customers.

#2 Texas Deere and Horse OFFLINE  

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Posted March 19, 2014 - 09:40 PM

How do you mean, the bearing or not locking up tight enough. Some clutches can be adjusted on air space clearance.


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#3 Canawler OFFLINE  

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Posted March 19, 2014 - 09:58 PM

There's usually a resistance value given in the manual as well.  If the insulation is wearing through on some of the windings that value will be off.


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#4 Gabriel OFFLINE  

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Posted March 19, 2014 - 10:07 PM

How do you mean, the bearing or not locking up tight enough. Some clutches can be adjusted on air space clearance.

This one seems to jerk the deck harder than I think it should when you engage the clutch. It doesn't do it quite so bad if you engage it at full throttle. The only clutch I've had to replace, was one that if the clutch was hot from operation, and the owner would shut it off, then try to re-engage it, it would not re-engage until the clutch had cooled. Before I had put in the new clutch, the old one would jerk the deck harder than what would probably be considered normal (perhaps what the one I'm currently working on is doing). Once the new clutch was in, you could notice a difference in how much it jerked the deck.

#5 Gabriel OFFLINE  

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Posted March 19, 2014 - 10:10 PM

How do you mean, the bearing or not locking up tight enough. Some clutches can be adjusted on air space clearance.

 

 

There's usually a resistance value given in the manual as well.  If the insulation is wearing through on some of the windings that value will be off.

Last year I checked the "air gap". It acted like this last year. Maybe it's okay, since it went another season.



#6 Gabriel OFFLINE  

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Posted March 19, 2014 - 10:14 PM

There's usually a resistance value given in the manual as well.  If the insulation is wearing through on some of the windings that value will be off.

I've not seen any resistance value for this clutch in any of the manuals for this garden tractor. The service manual did say to set the "air gap", which I did last year. It did not seem to make any difference. It is a Warner Electric clutch.



#7 js5020 OFFLINE  

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Posted March 19, 2014 - 10:34 PM

Had to take a look at my manual just to be sure, it says to move the throttle lever to fast position before engaging the pto.  Each brand may vary, so it would be wise to research and follow what they recommend to avoid "problems" that really don't exist when follwed.


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#8 lyall OFFLINE  

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Posted March 19, 2014 - 10:34 PM

see the following site - it should help

 

http://www.messicks....tricClutch.aspx

 

also see the manual section under misc manuals

 

 
and
 

Edited by lyall, March 19, 2014 - 10:52 PM.

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#9 JDBrian OFFLINE  

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Posted March 20, 2014 - 05:15 AM

Maybe the clutch faces are worn and it's grabbing quickly rather than slipping a bit when engaging. Perhaps disassembling it and inspecting all the parts may shed some light on what's going on. One other thing to check is the wiring and switch in the clutch circuit as well as the battery voltage while running. A low or high operating voltage will change the current in the clutch coil.


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#10 Gabriel OFFLINE  

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Posted March 20, 2014 - 08:36 AM

Oh by the way, this is a 2001 Yard-Man GT.



#11 Gabriel OFFLINE  

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Posted March 20, 2014 - 08:39 AM

Can a PTO clutch that is that new (compared to the ones on the older GTs) be taken apart?



#12 Gabriel OFFLINE  

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Posted March 21, 2014 - 09:24 AM

Thanks everybody for your help!

#13 HDWildBill OFFLINE  

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Posted March 21, 2014 - 09:38 AM

When I pull a PTO off for any reason I will clean it up and use shop air to blow out debris. It's amazing what comes out sometimes.  Do check your voltages, like Brian Suggested, I learned a lesson working on an electric fuel pump not long ago on what the wrong voltage will do. 


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