[jlewisa]

My troublesome but operational 100 has tested me again! 34 Deck is in good shape but one of the two tension springs broke. I ordered and received a replacement,dropped the deck, put it on and now she dies when I engage the PTO. Runs fine otherwise. I can almost get PTO to engage if I do so slowly. Belts appear good and deck rotates smoothly by hand. Manual troubleshoot guide suggest carb idle, ect. Would the carb be a good place to start? Regards, John Lewis

 

[bobd]

Sorry to hear that you are having problems with you JD100. Before the idler spring broke, were you able to successfully engage the PTO and drive the mower deck? Did you make ANY adjustments to the PTO linkages when you dropped the deck to change out the spring? Do you have an Operators Manual (OM) for this tractor and are you 100% positive both deck related drive belts are installed correctly? Have you attempted to engage the PTO with the deck drive belt removed and if so what were the results?

 

[jlewisa]

Thank you Bob.
Deck/PTO operated fine before the spring broke. I made no adjustments to the PTO. I have service manual for the unit and took my time with the belt. I will remove the deck belt this weekend and advise what what happens with PTO drive and double check it. Thank you again.

 

[jlewisa]

Bob: I did remove the deck belt. Engine does still stall when engaging PTO. Otherwise it runs fine. Any suggestions would be most welcome! Many thanks,
John Lewis.

 

[jpopper]

Sounds like the bearing on the PTO drive pulley that the actuator rod goes into is locked up.

 

[jlewisa]

Thank you for the feed back. Is this drive pulley the one that goes into the PTO clutch assembly in the front? With the engine off, I assume it should spin by hand if it is not locked up?
This 100 is frustrating but then again it is 33 years old! Thanks again for your help. John L.

 

[bobd]

If the engine stalls when engaging the PTO (with the PTO to deck drive belt removed), then I too would suspect that one of the bearings in the lower PTO assembly may be seized. The illustration below shows the components of the PTO assembly. There are two bearings involved, a roller bearing (#4) and a ball bearing (#9). With the PTO engaged (engine NOT running) it should not be possible to turn the lower half of the PTO w/o turning the engine over. With the PTO disengaged, the lower PTO half drops down and will rub on the PTO brake shoe (#25) which will provide some resistance to rotation but it should be possible to rotate the lower PTO half by hand (again, engine NOT running). Removal of the lower PTO half is accomplished by removing the locking pin (#16) and sliding the clutch arm (#17) notch out of the clutch fulcrum (#15). The lower PTO half can then be removed by removing the screw (#23) that holds the PTO brake shoe (#25). The lower PTO half is fairly heavy so be ready for it to drop off once the PTO brake shoe is removed. Instructions for servicing the PTO clutch can be found in Section 50, pages 10-16 through 10-18 of the service manual.

 

[whirlysdeer]

ok....found this thread....& I have a new to me 1976 model JD 100 with serial ##### of 57384...the former owner told me that when u engage the PTO.....the deck blades do spin.....but when u go to cut grass..it will stall the blades...I guess there is an adjustment of the nuts #22 in the pic diagram posted by Bob...Adjusted by raisin the nuts up the shaft some. If I'm wrong....let me know... Whirly

 

[jlewisa]

Greetings:
I have now removed all of the PTO clutch assembly except the Clutch Cup (#5) above.
Cap screw is out but the cup will not come off and if I'm reading the service manual correctly,
neither will the spacer, Should it just drop off the shaft or should I use a puller. I do not see the "Woodruff Key" mentioned in the instruction. Maybe it is just stuck on there. It looks like the original and has almost no lining remaining. Any advice would be most appreciated.
Regards, John Lewis - Indiana

 

[jlewisa]

Well, I did finally did get the clutch cup off. Used lots of penetrant spray, let it sit for a while (over night) and gave it several good smacks with the hammer on the side and by angling a crowbar in from the side (with the panels removed). There is practically none of the friction material remaining inside the cup.
Here's hoping that JD sells that part separate from the whole PTO assembly.
I saw a slot in the shaft but no key.
Regards, John Lewis frustrated 100 owner.

 

[jlewisa]

At long last I was able to devote some time to this project and reassembled PTO, belts etc.
All is well and I cut my first grass with her this weekend. It was the PTO safety switch. I took the opportunity to repack the cone bearings.
I learned a lot. Thanks to all who offered help.
Regards, John Lewis