PTO Won't Engage

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PTO Won't Engage

Postby Stanton » Wed Oct 16, 2013 6:57 am

With engine running and the clutch depressed, the PTO shifter will not engage. The shaft continues to spin or something prevents the shaft from stopping in order for the PTO lever to engage.

Clutch adjustment issue or something else?
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Re: PTO Won't Engage

Postby Don McCombs » Wed Oct 16, 2013 7:01 am

Stanton,

Has this PTO worked properly until this problem? Will it engage if you stop the shaft by hand?

Read this thread... viewtopic.php?f=1&t=81009
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Re: PTO Won't Engage

Postby Stanton » Wed Oct 16, 2013 7:53 am

The PTO worked in the past. Yes, read thru that thread and it didn't seem to apply.

To clarify: when the tractor is running, the PTO lever is not engaged, and the PTO itself is not spinning. Depressing the clutch pedal and waiting for the tranny shaft to come to a stop so I can engage the PTO, but the shaft does not stop. Thus, the PTO cannot be engaged by the lever.
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Re: PTO Won't Engage

Postby Scrivet » Wed Oct 16, 2013 8:56 am

Same problem, dry pilot bushing, different location. The one at the front end of the shaft in the flywheel and not the one at the rear for the PTO.
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Re: PTO Won't Engage

Postby Stanton » Wed Oct 16, 2013 9:21 am

Don McCombs wrote:Stanton...Read this thread... viewtopic.php?f=1&t=81009


Scrivet wrote:Same problem, dry pilot bushing, different location. The one at the front end of the shaft in the flywheel and not the one at the rear for the PTO.


So, I'm hearing that I should remove the PTO shaft, grease the bushing (aka, end of PTO shaft) and reassemble? Right?
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Re: PTO Won't Engage

Postby Bill V in Md » Wed Oct 16, 2013 9:26 am

Probably would not hurt to grease both ends, but I think Scrivet is referring to the pilot bushing at the other end of the shaft, near the engine freewheel (clutch end).
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Re: PTO Won't Engage

Postby Bill Hudson » Wed Oct 16, 2013 9:32 am

[quote="Bill V in Md"... Scrivet is referring to the pilot bushing at the other end of the shaft, near the engine freewheel (clutch end).[/quote]

That would be the one causing this particular problem.

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Re: PTO Won't Engage

Postby Hengy » Wed Oct 16, 2013 9:40 am

Yep...agree with the others. It is the front pilot bushing that is dry and not allowing the shaft to stop. To check this, put the tractor in gear (clutch depressed). Gears will probably grind a little getting into gear. Keep clutch depressed and then try to engage the PTO shifter. Should now go into gear and work normally.

Unfortunately, that means a split at the front of the bell housing to get to that bushing and shaft end...Merlin is going to need this repair this fall :(

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Re: PTO Won't Engage

Postby Smokeycub » Wed Oct 16, 2013 9:41 am

I agree with the others, the input shaft could be the problem. Can you get it in gear with the engine running? Does the tranny grind when you do? Although it doesn't rule out the clutch either.
Stanton wrote:Depressing the clutch pedal and waiting for the tranny shaft to come to a stop so I can engage the PTO, but the shaft does not stop. Thus, the PTO cannot be engaged by the lever.

If you can get it into gear then you can probably engage the PTO.
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Re: PTO Won't Engage

Postby Scrivet » Wed Oct 16, 2013 9:43 am

Yes, I'm referring to the pilot bushing in the end of the engine crankshaft up by the flywheel. Not the PTO bushing in the rear end.
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There's several threads about how to get to it.
Short version:
Park pointing downhill on the steepest incline you can find. Block wheels.
Long straw(s) on favorite lubricant, reach through clutch handhole and spray on shaft as far forward as you can get. Give time to run down shaft to bushing.

Long version:
Split Cub.
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Re: PTO Won't Engage

Postby Denny Clayton » Wed Oct 16, 2013 10:11 am

Try the short version, first :!: :wink:
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Re: PTO Won't Engage

Postby Stanton » Wed Oct 16, 2013 10:55 am

As always, expert advice.

With the engine running, the tranny gears are (sometimes) hard to shift into; especially from N to 1st. But at other times, I can go from R to 1st, or 2nd and 3rd w/o any noise or resistance. It's just when it's in N with clutch depressed, that the engine/tranny shaft won't stop or slow down enough to move the PTO lever to engage.

Denny Clayton wrote:Try the short version, first :!: :wink:

Thanks, Scrivet. I'll try the short version first.
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Re: PTO Won't Engage

Postby bythepond88 » Wed Oct 16, 2013 12:22 pm

From your latest description, the problem is definitely at the pilot bushing. You can shift from gear to gear without a problem, because the wheels are mechanically connected to the transmission, so when the wheels stop, the transmission, including the input shaft, are also stopped.

I had the same symptoms, and lubing the pilot bushing solved them. Of course, I didn't know about the shortcut at the time.
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Re: PTO Won't Engage

Postby Stanton » Mon Oct 28, 2013 8:04 am

As usual, one thing turns into another...

Tried Scrivet's short version and it worked, but while pointing downhill, tranny oil that had leaked and pooled in the torque tube began running out. That reminded me that I had not replaced the rear end seals on this Cub when I first re-did it in 2009. Ordered seals last week from TM Tractor (great service and fast shipping!!) and they arrived on Wednesday. Split the tractor yesterday afternoon and will finish up this week. Also decided to replace the clutch pilot bushing while split.

BTW--did find out why my clutch didn't totally engage. The clutch operating rod was bent and the clutch pedal lever (inside the torque tube) was pushed back. So, earlier, when I tried to adjust the clutch operating yoke forward, I was running out of threads. I'll straighten the rod and re-adjust the pedal lever forward, so the TOB has more forward movement to engage the clutch fingers. This should really help shifting.

Will also grease the new pilot shaft bearing to avoid any more sticky PTO issues. :)
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Re: PTO Won't Engage

Postby Scrivet » Mon Oct 28, 2013 8:13 am

Glad it worked, but I can't take credit for the idea, I've seen it on the forum before. With your leaking transmission you just needed to get it pointed down a steeper hill and it would of oiled itself :D :lol:
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