PTO pops out

[James of Stark]

A friend has an 8N that has troubles with the PTO popping out at undesired times while brush hogging. I am considering a split or get to the pawl that seems to be the culprit, or digging down through the top via the hydraulics. Any suggestions?

 

[souNdguy]

whoa.. slow down...

before you go splititng and diffing. find out WHY it is popping out.

is it something simple like the detent that holds the shiftr in is bad.. or is it say.. a bad split ring / bearing ont he pto shaft that is letting it walk the collar out of engagement?

with tractor off, grab pto stub at back of tractor.. if it has in / out or even side toside movement.. pull for work.

in / out is what will walk her out of engagement.. generally a broken or popped out split ring, thouhg could be bad bearing, damaged bearing carrier or slipped wear ring.

sid/side movement is bad bearing, and well.. seal needs repalcing too as the bearing play lets the shaft hog the seal out.

soundguy

 

[old]

Split the tractor to work on the PTO ??????????????? Better get the I-T FP-4 manual before you move on. The PTO can be worked on from the rear of the machine and no split needed to fix it

 

[Hobo,NC]

(quoted from post at 16:38:10 08/29/11) A friend has an 8N that has troubles with the PTO popping out at undesired times while brush hogging. I am considering a split or get to the pawl that seems to be the culprit, or digging down through the top via the hydraulics. Any suggestions?

what souNd says,,, if alls well with the pto shaft and you end up having to remove the PTO support no need for a split... Drop the hydraulic pump and the support will come out that hole BTW the detent is part of the PTO support and not in the shift leaver.... 99.9 % of the time its the bearing at the rear of the PTO shaft,,, if ran long enuff pop'n in and out it will damage the PTO support at the rear of the trans and the gear on the end of the counter shaft...

 

[James of Stark]

We believe it is the detent that pops out of place. He can reach in and reset it, but would like it get at it best. We have a "blue" manual. In looking at component pics, it looks like the split would reveal the PTO shift mechanism in plain view and have full access.
Thanks for all the help. This site is great!

 

[ZANE]

Usually the reason the PTO will not stay in gear is because of a loose PTO bearing. This can be caused by a badly worn bearing, a broken snap ring groove in the PTO bearing housing or the bearing retainer sleeve having moved from where it should be. Or the bearing snap ring can be dislodged.

Any movement front to back will cause it to jump out of gear.

The PTO coupling splines can also be worn and cause it to jump out of gear too, but not as likely as the before mentioned things.

The detent is another thing to examine but it is less likely to be the problem.

Always be sure that the telescoping portion of the drive shaft is well lubricated or it can damage the PTO bearing etc.

 

[James of Stark]

We tried to move the shaft both ways with no movement.

 

[souNdguy]

here's the diagram

 

[James of Stark]

Thanks! a picture is worth it all! Part # 13 keeps popping out.

 

[James of Stark]

Part #8 is tight.

 

[souNdguy]

check for wear

 

[James of Stark]

So, what is the easiest method to use to get to this?

 

[TheOldHokie]

(quoted from post at 15:25:27 09/07/11) So, what is the easiest method to use to get to this?

If it were me I'd do the spilt. Probably less than an hour to split it and you will have the PTO shifter sitting right in front of you.The shifter is bolted to the rear of the transmission and also acts as the carrier for the rear countershaft bearing. Here is a picture of the shifter. The detente for the shifter rail is a spring loaded ball installed through the hole in the top of the support cast into the housing. You install the spring into the hole followed by the ball, depress them with a punch, and slude the shifter rail in. Pull the rail out and they will remove themselves

There is a sliding dog clutch collar inside that housing. The collar is splined to the PTO shaft and has a set of dentals on the transmission end that engage matching dentals on the countershaft. That is what powers the PTO. Here is a picture showing what it looks like from the transmission end.

Popping out of gear is likely either a worn detent ball/groove or dentals. The detente is the easiest and cheapest to fix.

TOH

 

[Hobo,NC]

If I were on commission I would drop the pump... If I wanted to gamble i would loosen the nut #8 rotate the shaft #7 1/4 turn and like magic a new slot for the ball to hang onto... I doubt the detent is the problem tho,,, if somethings up with the PTO support its a bent/worn shift fork are a worn out drive gear on the end of the counter are both (either can be replaced with out a split)... Its damaged caused from ruining it to long when the BRG go's out on the PTO shaft...

 

[souNdguy]

TOH and hobo gave you the drawings and some good advice for next course of action, zane too.

soundguy

 

[James of Stark]

(quoted from post at 20:58:25 09/08/11) TOH and hobo gave you the drawings and some good advice for next course of action, zane too.

soundguy

Thanks all! We will look into this and I will post the results!!!