Engine shuts off with PTO on after it warms up.

[Blacklac96 3]

Hello! New to the forum here. Have a C-85 1984 K series engine tractor. The problem I'm having is after the blades are engaged awhile and it warms up, the tractor bogs down after a little and then shuts off. Sometimes difficult to restart if at all until it cools. Replaced, coil, condenser, plug and checked points. All seem to be fine. One time I noticed the online fuse blew for the starting circuit. Any help is appreciated!

[Ed Kennell 40,564]

to the 

 

Does it run and drive OK if the PTO is not engaged?    Need to determine if the engine is the problem or is the deck and mule drive the problem.

[gwest_ca-(File Mod) 11,257]

Suspect your tractor is a 1983 or older model.

 

The ignition coil is powered by the ignition switch ignition terminal.

But

The ignition switch is powered by the pto switch when the pto is OFF and not when the pto is ON.

Ignition switch is powered by the seat switch when the operator is in the seat with the pto OFF or ON.

 

Strange way to incorporate safety switches.

You should have battery voltage at the coil + with the pto OFF and key in Start or RUN position.

With the pto ON operator in seat closes the seat switch and sends power to the coil + through the ignition switch with key in Start or RUN position.

 

Click on the fuzzy picture to see the wiring diagram.

 

[Blacklac96 3]

I will trace some wiring definitely thank you for the diagram for sure. 

@Ed Kennell- yes it does seem to run fine without the pto on and hasn't shut off on me, although I haven't ran it much without the PTO on. When its engaged you can hear the engine initially bog down but then smooths out but seems to put strain on the engine more as it heats up.

[953 nut 58,042]

The problem could be a plugged vent in  the gas cap. As the engine is operated fuel is being removed from the tank. If there is no vent for the tank a slight vacuum will be developed which the fuel pump can't overcome. Try operating it with the fuel cap a bit loose and see if this cures the problem.

[Ed Kennell 40,564]

1 minute ago, Blacklac96 said:

yes it does seem to run fine without the pto on

Seems you may have a bad deck spindle or mule drive bearing.

[Blacklac96 3]

Ok I will check both the gas cap and mule drive/spindles. I know I can service or replace the spindles, am I able to service the mule drive bearing or replace it?

[peter lena 9,095]

@Blacklac96   both those mule drive bearings and the deck spindle bearings are the same , 6203 ( 3/4 ) 2RSC3 , they also have wide bearing side grease shields , do not mean to add to your , bearing issue , but those bearings fail and get very whiney due to  LUBRICATION FAILURE , lucas  green  xtra hd chassis grease , walmart  $ 8 , bar code  04980710301 9 ,  those bearing side shields come off easily with a small flat edge  putty knife , do not rough house them , the come off intact  , wipe out  original grease , carb cleaner , repack with  lucas grease  to same ammount , done a number of deck and mule  upgrades , no noise / rough  issues , only a suggestion , that entire  pto drive set up is a gold mine , for improvement , difference is amazingly  smooth / quiet , pete   

[stvski80085 161]

12 hours ago, Blacklac96 said:

Hello! New to the forum here. Have a C-85 1984 K series engine tractor. The problem I'm having is after the blades are engaged awhile and it warms up, the tractor bogs down after a little and then shuts off. Sometimes difficult to restart if at all until it cools. Replaced, coil, condenser, plug and checked points. All seem to be fine. One time I noticed the online fuse blew for the starting circuit. Any help is appreciated!

I had the same issue a couple week ago.  I reset the carb back to what the manual said and adjusted the governor.  The issue was solved after that.  Just an idea. 

[Blacklac96 3]

This is extremely helpful. I am going to do all of this as I like to keep up on all service projects. I really love the tractor and it's true that they definitely don't make them like they used to! I can't replace it with this new garbage! 

[stvski80085 161]

That’s why I got one.  Why pay $1200 or more for a cheap piece of junk. I wanted something that will last.  They are both quick and easy to set.  I would start with that and see what you get.  If that doesn’t do it others here know more then me.

steve

Edited Wednesday at 01:23 AM by stvski80085

[Blacklac96 3]

Thanks again! Did get the pulleys off of the mule tonight and they were both dry and clicking, they spin but there was a lot of noise and I could see the inner one was worse and had got hot. So great info in the right direction! Plus I have the manual and I'm going to reset the carb. 

[8ntruck 7,399]

Do the blades spin freely by hand?

[Blacklac96 3]

Yes, they've been maintained and spin easily. I can see the previous owner kept them greased well. 

[8ntruck 7,399]

My guess is carb adjustment or maybe timing.  Point gap affects timing in these engines.  Check that.  Others have reported good results with a gap setting of .018".