working on a scag tiger cat 61. keeps blowing fuses when pto is in operation.

J

jerry1249

Member
I can unplug pto and it runs great. my question is,how is the best way to determine if the pto has shorted itself out and feeding back? I have replaced the battery and pto switch.
 
Just replaced a clutch on a scag last year for the same reason. Take on ohm meter and check the resistance across the two wires. Should read in the range of 2.4-3.4 ohms. Any higher or lower indicates a problem with the clutch. Also while testing go from one of the wires to the housing of the clutch and see if you have continuity. continuity indicates a short.
 
IlEngine seems to have a very good answer for you. You can test the clutch like he has explained.
One more thought for you...If you disconnect the wiring plug from the clutch and start your mower, then operate the PTO switch and the fuse doesn't blow...you pretty much isolated it down to the PTO clutch as being the problem. Wish you well on your experience. Enjoy your week!
 
jerry1249 said:
I can unplug pto and it runs great. my question is,how is the best way to determine if the pto has shorted itself out and feeding back? I have replaced the battery and pto switch.
Click to expand...

thanx guys. I've usually manage to solve these things but one really stumped me. will have mowing now in no time. thank you both. Jerry
 
ILENGINE said:
Just replaced a clutch on a scag last year for the same reason. Take on ohm meter and check the resistance across the two wires. Should read in the range of 2.4-3.4 ohms. Any higher or lower indicates a problem with the clutch. Also while testing go from one of the wires to the housing of the clutch and see if you have continuity. continuity indicates a short.
Click to expand...


I just replaced a Kholer 25 HP from OPE and was advised I should install a clamping diode in front of clutch itself to prevent back feeding spikes into electrical system when PTO is engaged.
$12.00
Kohler Part # 2575540S Clamping Diode Kit 25 755 40-S
 
Check the charging and the battery as well. There are different specs for the different clutches used so keep that in mind while doing your ohms test. You can also do the amp draw test as well so see how it is drawing and that also depends on which clutch you have as well.
 
We have had fuse issues more than one time also on our Scags. We solved a long going fuse blowing problem by changing the fuse holders out. The old ones did not really look that bad but apparently they had an issue because when we change the fuse holders we stopped blowing fuses on that machine.
 
ILENGINE said:
Just replaced a clutch on a scag last year for the same reason. Take on ohm meter and check the resistance across the two wires. Should read in the range of 2.4-3.4 ohms. Any higher or lower indicates a problem with the clutch. Also while testing go from one of the wires to the housing of the clutch and see if you have continuity. continuity indicates a short.
Click to expand...

So...since my PTO unit shows 2.2 ohms and I blow fuses when I engage the PTO, I guess my PTO is shorting out.

I already replaced the switch..fixed it for about an HOUR. Then it started blowing fuses when I engage the PTO.

I may be destined for an expensive PTO replacement it seems???? Give it to me straight fellas. :)
 
Kev71h said:
So...since my PTO unit shows 2.2 ohms and I blow fuses when I engage the PTO, I guess my PTO is shorting out.

I already replaced the switch..fixed it for about an HOUR. Then it started blowing fuses when I engage the PTO.

I may be destined for an expensive PTO replacement it seems???? Give it to me straight fellas. :)
Click to expand...


5.5 amp draw calculated isn't that far out of spec. But that could go up when the clutch heats up. Did one on a DR field mower a couple weeks ago with an ohm reading of .5 ohms. which caused some serious wiring issues.
 
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