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F525. Updated mower switch by John Deere is not engaging mower

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  • 187 Answers

The John Deere F525, a front cutting machine, has 3 fuses.
20 Amp
15 Amp
10 Amp

Check the 15 amp fuse. I believe this supports the PTO clutch. If you replace the fuse and it blows again, check the electric clutch. You will likely find burnt or melted wires. The bearings do go out on these clutches causing them to run hot and eventually burn up.

PTO Clutch will not engage: There is a very fine one page discussion on evaluating electric clutches at this site:

http://www.messicks.com/Articles/FixingElectricClutch.aspx

My JD tech manual, which covers the entire LA 100 series, agrees with the electrical specifications. It states that the Electric PTO Clutch should show the following:

Resistance 3.7 ohms
Current Draw 3.25 amps
It does not give the air gap.

It does include a note to check the PTO Clutch Key for damage or if missing. So there is a drive key between the PTO Clutch and the shaft. Additionally, it recommends checking the tightness of the cap screw. That's the screw or bolt that holds the clutch on the shaft.
Cap Screw torque 55 lb-ft (75 N.m).

If the fuse blows, I recommend you check the resistance of the clutch. If the clutch is shorting to ground it will show zero resistance when you ohms the connector wire to a ground position. In which case, you will have to replace the clutch.

Fixing Electric Clutches

Other possibilities.
On the F525 there is a cut-off switch in the hydraulic system. It is a low pressure cut off. If you were running the mower and deck and then it suddenly stopped, it may be low pressure in the hydraulics. It will not automatically reset as you are using the same volume for the drive pumps. Once the oil gets low enough it cuts out the deck drive 1st, then the drive pumps.

Posted on Apr 17, 2015

  • Eugene Rounds Apr 17, 2015

    Current Warner and Ogura replacement PTO clutches are drawing 5-7 amps with resistance around 1.75 ohms.

  • Kprime
    Kprime Apr 17, 2015

    Good to know. Makes sense, a heavier clutch, more cutting load.

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I take it that you had the rocker switch. Did you wiring in the new connector as instructed? If so check for voltage at the PTO connector with the switch in the engage position if voltage is present then you have a bad PTO clutch assembly.

Posted on Apr 16, 2015

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  • John Deere Master
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If John Deere place did it take it back to them till it works properly

Posted on Apr 16, 2015

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