How to Test a PTO Clutch for Resistance!

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Melted PTO Switch?
In today's video, I'll be showing you how to test a PTO Clutch for resistance!
I've worked on this mower previously & we had a safety switch issue that we diagnosed, watch that video here: • Fixing Electrical Issu...
When performing a 12volt Test on this PTO Clutch, the clutch engaged & worked perfectly fine. To conduct this test, simply unplug your PTO clutch and put 12v directly to it. You should hear the electro-magnet engage.
However, once we tested for resistance, the reason for the melted PTO switch became clear.
Normally, a PTO Clutch will test at 2-4 Ohms of resistance (regardless of whether it works or not).
This PTO Clutch tested at 00.4 Ohms & was removed & replaced.
The reason the PTO clutch tested under 2ohms is because it has a "short-to-ground" somewhere inside the clutch itself, which lowers the resistance.
If the PTO clutch tested over 4ohms, there could be corrosion (caused by moisture) built up on the connector, or inside the electro-magnet itself. This corrosion would cause higher resistance.
Explanation on why the switch melted;
In an electrical circuit, if Voltage remains the same, and resistance is decreased, amperage increases.
Here's a textbook definition: "Voltage equals the amperage multiplied by the resistance in a circuit. If the voltage remains constant and the resistance is dropped, the amperage across the circuit must increase."
Essentially, with a short to ground there is little to no resistance, as electricity takes the path of least resistance. So because the 12v from the battery (around 14v from the magneto/charing system when the engine is running) always stays the same, and the resistance decreased due to the short-to-ground, this is what increases the amps in the circuit!
This increased amperage overloads the wires, which will then create additional heat on the wires & connectors, causing them to prematurely fail, and possibly melt.
I gave my customer 2 options for PTO Clutch replacements on this White Outdoors ZT50 mower.
The 1st was an OEM direct replacement;
Warner 5219-99 for $507.98
The 2nd was an Aftermarket Xtreme conversion kit;
Xtreme X0391 for S285.34
My customer opted for the more affordable option, so I went with the Xtreme!
We test the new PTO Clutch for resistance & it tests around 3.5 Ohms.
When installing the new Xtreme Clutch, you MUST use the top spacer they provide, as it prevents the PTO clutch from riding up the crankshaft!
If you don't use this, you'll void the warranty!
Also, make sure to engage the new PTO Clutch at half throttle, approx. 10 times before re-torquing the bolt to 50-55 ft-lbs.
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Опубликовано:

18 авг 2018

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Комментарии : 266

@EliminatorPerformance 4 года назад

Explanation on why the switch melted;

@sarahc270 3 года назад

Our Cub has been sitting for about 4 years because it started smoking. Hubby had already burnt motor up and had to replace it. Then got frustrated and pushes it in the corner of the barn. Buys new mower. Here we are.. new mower needs a new part and I miss the cub. So I tow it up to the garage and start taking it apart looking for melted wires. I find an old broken pto switch in the cup holder...examined it..melted. Then I pulled apart the newer one and it was starting to melt as well. Watched your video... I have no mechanical smarts what-so-ever! But you made it very simple. I am getting ready to take my fluke and check out the readings. Guarantee I need a new clutch. THANK YOU.

@JShep-yu3ki 2 года назад

3+ years later and your video is still providing answers to us DIYers. Thanks

@BradHudsonhudson 4 часа назад

Good video but you forgot the most important part. After installing new clutch you need to varnish the new one before operating. Start off low idle and engage pto for 1 seconds and turn off let blades stop than engage 10 times. Do this at half throttle and full throttle.

@zood62 4 года назад

You want to point out that 13.5 volts are necessary going into that new clutch before putting it back into service. Measured at the clutch with PTO engaged. Zero volts disengaged,13.5 +/- engaged. If it's only battery voltage at that new clutch it will fail.

@hotratz69 4 года назад

Explanation of resistance versus current flow (amps) is backwards. Resistance is opposition to current flow. More resistance, less current flow or AMPS. Think of a short circuit as NO resistance and you get big sparks. Think of the air gap between two contacts or wires as infinite resistance, No sparks. And everything in between.

@mozartturenne7630 2 года назад

Mower keeps blowing fuses

@artichoke60045 5 лет назад

Great video. A small correction about voltage, current and resistance. A short = low resistance = high current, and that's the problem. v = i r. Power (rate of energy dissipation) = vi = v^2 / r . Since you have a fixed 12V from your battery, this is the right formula to use. v = 12 volts, so the lower r gets, the more energy is dissipated and the hotter everything gets. There's nothing intermittent, nothing to do with rust or squeezing a garden hose (that's a nice analogy for different physical principles not this one.)

@aikendrum1518 5 лет назад

Great video, but your description of voltage resistance and current is exactly wrong. There must be an internal intermittent short on/in the solenoid

@robertlytle1490 3 года назад

This video has issues, is breaking up constantly. Can't really get the information.

@cacodaemon1 Год назад

My clutch wires are still connected to the clutch but got separated from the red / black wires that ran to it. However, both of the wires coming from the clutch are green with no way to see any difference between them. How to I find out which of the green cables is positive and negative?

@daleleishman4106

Wow! Thank you for spending some time to explain your process and how things work on this PTO. I've watched a ton of different RU-vid videos on fixing things. Sometimes the instructor doesn't go into detail on multi-meter settings or how the part should function like you've done here. Very well done!

@jefftaylor947 3 года назад

Just got a free John Deere, and this is extremely helpful in my troubleshooting it! Runs great, however now I know how to start testing the PTO clutch ohms. Many thanks

@FanOWater 3 года назад

Great, thorough video. I ended up having a different problem (frayed wire that was hard to spot), but watching this triggered the idea that led to the solution.

@garyknirr8209 4 года назад

Thanks for the video. I have a PTO that PEGS my Amp Meter when I engage the PTO. I'm headed out to check the PTO resistance. I liked your explanation for current. I use similar when explaining to train engineers. You have max thumbs up on this video.

@timothyphaff4088 5 лет назад

AWESOME BECAUSE of No BS ING around!!! Right to the point, fast and simple...Thank You, sir...

@kazparzyxzpenualt8111 3 года назад

I have been chasing gremlins with my friends DR brush hog and this video really helps me take off the gloves and get down to business. Thanks! No click on the PTO, seems shorted, wires get hot right away. Ohm test ...Good to know!

@rongaudelli7379 4 года назад

Fantastic video. Saved me a ton of time on the repair and it worked perfectly.

@customcutter100 2 года назад

Thanks for sharing your knowledge. My clutch on my Gravely 460 has been shutting off after 10-15 minutes of mowing for the last few months. It finally quit all together a few days ago. Between this video and the one on air gapping and a few other YTubers I was able to determine that the air gap was over .025" I tightened it up to .020" and it works like new! Saved me over $500. Thanks again

@progers5019 5 лет назад

Your video was very helpful. You did a great job explaining things. I'm in the middle of replacing the elec clutch on my husq yth-2348 and purchased the same after market clutch from extreme. I'm concerned about using the round anti spin rod vs ordering a newer design flat steel type with more hold surface. My anti spin rod popped out of the hole twice. I had been hearing a singing noise with a slight grind sound for a good while (rather loud only at times) After ohming out the clutch leads found it to be only .002 which is close to zero. It ripped my repaired wires loose twice before I found the anti-spin rod popped out. Anyway I now have the new clutch in hand. I'm not a mechanic but try to fix my own stuff and am usually successful. I do the research and watch videos when available, then go do it. Videos like yours are so helpful to DIY"ers. Thanks