we have 2 wildcats with 27hp liquid cooled Kawasaki's. both mowers have close to the same hours 1200. both are blowing the fuse that controls the pto. both fuse holders are getting very hot before blowing the 20 amp fuse. both have blown the pto switch. it seems that it is time to replace something but I don't know what. when the clutch is engaged it does not slip but I don't know much about the scag clutches. my gut tells me the clutch is drawing to much power or we are having a bigger electrical issue. anyone having the same problems?
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PTO issues
- Thread starter jcrozier
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Export threadMad Mackie
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Two similar machines doing the same thing!!! Strange but possible!!
Has any maintenance been done recently to these machines?
Do you have the operators manuals for these machines? If not, they are available on the Scag website.
All the battery power used passes thru the 20 AMP fuse to include the charging system. The other fuse is for the charging system output.
You need to know what the electrical system voltage is with the engine running at full throttle, mower deck NOT running.
A voltmeter connected across the battery terminals will tell you this. Should be 14.1-14.3 volts DC. If not then the electrical system needs to be diagnosed to find the problem(s).
With the engine NOT running, find the clutch power connector and disconnect it. Using a digital multi meter in the resistance measuring range, check across the two terminals of the clutch connector and from each to ground. The clutch should read from 2.8-3.2 Ohms and infinity to ground.
Mad Mackie in CT
Has any maintenance been done recently to these machines?
Do you have the operators manuals for these machines? If not, they are available on the Scag website.
All the battery power used passes thru the 20 AMP fuse to include the charging system. The other fuse is for the charging system output.
You need to know what the electrical system voltage is with the engine running at full throttle, mower deck NOT running.
A voltmeter connected across the battery terminals will tell you this. Should be 14.1-14.3 volts DC. If not then the electrical system needs to be diagnosed to find the problem(s).
With the engine NOT running, find the clutch power connector and disconnect it. Using a digital multi meter in the resistance measuring range, check across the two terminals of the clutch connector and from each to ground. The clutch should read from 2.8-3.2 Ohms and infinity to ground.
Mad Mackie in CT
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thank you very much, I think we have 2 different problems that had similar results.
tested the resistance on both clutches one was 2.8 the other was .7.
haven't tested charging voltage yet but I suspect now one will be high or
we have a bad ground or a short.
tested the resistance on both clutches one was 2.8 the other was .7.
haven't tested charging voltage yet but I suspect now one will be high or
we have a bad ground or a short.
Mad Mackie
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The clutch with .7 Ohms is definitely bad and needs to be replaced. When installing a new clutch, check it for continuity and air gap. When installed it must be burnished before putting the full load of mowing on it.
But also check the clutch that has 2.8 Ohms of coil resistance from each leg to ground, this should be infinity or open circuit. I would also check the air gap on it. The air gap involves the clutch brake which engages when the PTO is off. If the air gap is not within spec, the it can brag while the clutch is in operation causing premature wear and excessive unwanted heat.
But check each machine for a properly operating charging system.
Mad Mackie in CT
But also check the clutch that has 2.8 Ohms of coil resistance from each leg to ground, this should be infinity or open circuit. I would also check the air gap on it. The air gap involves the clutch brake which engages when the PTO is off. If the air gap is not within spec, the it can brag while the clutch is in operation causing premature wear and excessive unwanted heat.
But check each machine for a properly operating charging system.
Mad Mackie in CT
Mad Mackie
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I think that Wildcats have the same clutch as my Tiger Cub which is a Scag # 461660. My local Scag dealer gets $279.95 plus tax for this clutch, but check the parts manual for your machine. If your clutch hasn't overheated too badly then the part number label may still be on it. The clutch on my machine checks at 2.4 Ohms and is out of range for an Ogura GT 3.5 clutch, so I check it periodically, but no doubt I will need to replace it sometime soon.
Although rare, if the clutch coil shorts to ground, the path of least resistance is thru the crankshaft, the main bearings to ground. The main bearings being the least noble of the metals involved will decompose rapidly causing internal engine failure. I had the opportunity of disassembling and inspecting an engine that had this happen to it.
Mad Mackie in CT
Although rare, if the clutch coil shorts to ground, the path of least resistance is thru the crankshaft, the main bearings to ground. The main bearings being the least noble of the metals involved will decompose rapidly causing internal engine failure. I had the opportunity of disassembling and inspecting an engine that had this happen to it.
Mad Mackie in CT
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