Export thread

No power to the PTO clutch

#1

B

BenR

I was mowing a yard with my Excalibur. The grass was not real tall but was going through some leaves left from last year so I had the door to the outlet of the deck closed. I was mowing fine and then it wasn't. I was not at my home. so I loaded it back up on the trailer and took it back to my place. First I pulled the connector to the PTO. I put 12 volts to it and the PTO activated. I then Checked the power side of the connection and their is no power coming to the PTO. I do not know where to go from here I know it has a interconnect that connects all the safetys and whatever but know nothing about that. Does anyone have some experience with this? I really do not want to take this monster in for service.
Ben Russell
Kansas City Area.


#2

StarTech

StarTech

Most likely you have a failed PTO switch. But you could also a failing PTO clutch that is partially shorted which would burn the PTO switch.

I have seen PTO clutches to pull over 16 amps and still operate but melt down switches, connectors, and wiring coatings depending how it allowed to operate partially shorted. Also one other possible is a wire terminal that has failed at the PTO switch creating a loose connection.


#3

B

BenR

StarTech said:
Most likely you have a failed PTO switch. But you could also a failing PTO clutch that is partially shorted which would burn the PTO switch.

I have seen PTO clutches to pull over 16 amps and still operate but melt down switches, connectors, and wiring coatings depending how it allowed to operate partially shorted. Also one other possible is a wire terminal that has failed at the PTO switch creating a loose connection.
Click to expand...
Thanks for your input on this. I had to stop the other day and wait for my next day off. I will check the things you mentioned. I was leaning to your same thoughts.
Ben


#4

S

slomo

Fuse, switch, relay and or maybe some mice chewed wire. Trace it back from the PTO.


#5

A

Auto Doc's

PTO clutches do fail when hot, then cool down briefly and try to work again. The PTO plates have too much air gap form age and wear, and the clutch coil magnet strains to hold them together when powered. Some PTO clutches can be adjusted tighter and some cannot.

Check the PTO switch for pins that look like they have been heated and starting to melt the switch housing. Likely the switch will need to be replaced.


#6

StarTech

StarTech

As I said a bad F56 (Packard (GM Delphi)) can cause the same melting due arcing at the switch or any other connection. Easy to replace with the right tools.

I go thru as many as 100 plus of these terminals every year. Just replaced 4 yesterday on a Husqvarna Craftsman.


#7

K

kinard

More than likely the PTO switch needs to be replaced.


#8

C

cliffeby

BenR said:
I was mowing a yard with my Excalibur. The grass was not real tall but was going through some leaves left from last year so I had the door to the outlet of the deck closed. I was mowing fine and then it wasn't. I was not at my home. so I loaded it back up on the trailer and took it back to my place. First I pulled the connector to the PTO. I put 12 volts to it and the PTO activated. I then Checked the power side of the connection and their is no power coming to the PTO. I do not know where to go from here I know it has a interconnect that connects all the safetys and whatever but know nothing about that. Does anyone have some experience with this? I really do not want to take this monster in for service.
Ben Russell
Kansas City Area.
Click to expand...
I had same issue and as described it was my PTO switch. Mine was melted so I knew it was the step 1. Cheap replacement on Amazon. I checked the amperage draw on replacement and it was fine. Been good for over a year.

I assume the contacts get dirty and resistance overheated the switch.


#9

A

Auto Doc's

The machine label with the model and serial number would be helpful. It is better to have that info so we can look for some wiring diagrams to better help you.


#10

A

Auto Doc's

The machine label with the model and serial number would be helpful. It is better to have that info so we can look for some wiring diagrams to better help you.


Footer Links 1

Top