NH 1920 Two-speed PTO option: How can I tell if my tractor has this?

[grcutter]

I'm spending my vacation day trying to solve this PTO grinding issue.
So far I have shortened the clutch rod. This did not help. With the clutch all the way in, I can engage the PTO level without the grinding. Then I can release the clutch about an inch before the grinding starts, pressing back in will stop the grinding. So it seems like the PTO clutch is moving back and forth as it should.
I moved on to trying to adjust the PTO clutch release bolts.
I removed the left arm that supports the front loader to reveal the rubber plug.
Opening the plug, I don't see any bolts to adjust. Do I need to rotate the clutch so that the bolts appear in the window?
Also, should there be any lubricant in this port? It is really dry in there. I poked my finger down to see if there was any fluid and just got some dried grease on the tip.

By the way, does the NH 1920 actually have this PTO adjustment? I could not find any mention of this rubber plug and hole in my NH 1920 service manual.
I had to go back to my Ford 1710 service manual (which covers 1210 through 2110) to find the description of this.

Here is the image from the Ford 1710 manual:

If I do have to rotate the clutch to find this bolt, how do I do that? Also, does this mean that there are 3 such bolts and I have to find all 3?

Below is the image from the NH1920 Service manual which makes reference to 3 PTO clutch release adjust bolts.

 

[TractorTech]

Yes, the 1920 double clutch has this adjustment and you would rotate it to find the bolt/lock nut. BUT, since you can stop the PTO with the clutch pedal all the way in and shift without grinding, it does not need an adjustment! It sounds as though everything is operating properly on the clutch.

Now, when you engage the clutch/let out the pedal for the PTO, the grinding starts. This tells me that the grinding might be a bearing or some other problem. Where is the grinding sound coming from? Bell housing, mid transmission or rear end? This is related only to the PTO?

I read your descriptions again and I thought about this more. Pretty sure the sliding collar for the PTO is what is causing the grinding. This would explain the shifter being pushed back. Question is, what came first, the stripped shaft or the lever not holding position causing the shaft/gear to strip? Stripped splines or gear teeth on the collar/shaft would fit your description. Not 100%, but sounds like it.

 

[TractorTech]

Here are some shots from the Service Manual on the PTO and rear end

 

[grcutter]

Yes, the 1920 double clutch has this adjustment and you would rotate it to find the bolt/lock nut. BUT, since you can stop the PTO with the clutch pedal all the way in and shift without grinding, it does not need an adjustment! It sounds as though everything is operating properly on the clutch.

Now, when you engage the clutch/let out the pedal for the PTO, the grinding starts. This tells me that the grinding might be a bearing or some other problem. Where is the grinding sound coming from? Bell housing, mid transmission or rear end? This is related only to the PTO?

I read your descriptions again and I thought about this more. Pretty sure the sliding collar for the PTO is what is causing the grinding. This would explain the shifter being pushed back. Question is, what came first, the stripped shaft or the lever not holding position causing the shaft/gear to strip? Stripped splines or gear teeth on the collar/shaft would fit your description. Not 100%, but sounds like it.

Having looked at the clutch plates, I agree with you: This is not a clutch plate adjustment issue, it is a problem with one or more gears in the rear.

One thing that was not clear from the repair manual, (but probably should have been obvious?) is whether the 1mm gap in the clutch plates is measured with the clutch fully in.
With the clutch fully out, the plates appear to be touching. When fully in, there was about a 1mm gap.

I was able to put a 14mm open end wrench on one of the bolts but could not move it. The flywheel started to move instead. There also seemed to be maybe enough room for 1/8th turn at the most. Something would be needed to hold the fly wheel from rotating at the same time.

For completeness, in case others go down this path, I'm including pictures of this bolt, hole, and plug.

 

[grcutter]

Here are some shots from the Service Manual on the PTO and rear end
View attachment 775855View attachment 775856View attachment 775857View attachment 775859View attachment 775860

If I interpret these service manual pages correct, then it appears to be a huge undertaking even to just view the gears. I'm under the impression that removing the hydraulic lift cover is not trivial.

 

[TractorTech]

If I remember right, you can remove the seat and sheet metal over the rear axle to access the small plate in front of the top cover.
Then, you should be able to access the PTO coupler for inspection.

It may be that the rollbar top half comes off, then the fenders/rear deck come off. Can’t remember for sure.

 

[MTGreen]

If I remember right, you can remove the seat and sheet metal over the rear axle to access the small plate in front of the top cover.
Then, you should be able to access the PTO coupler for inspection.

It may be that the rollbar top half comes off, then the fenders/rear deck come off. Can’t remember for sure.

On my 1720 you don't have to remove the rops/fenders to access this panel

 

[grcutter]

Happy Holidays Everyone!
Tomorrow, I will remove the seat and look for this small plate on the top of the lift cover (after temperatures get above freezing...).
But from looking at the parts diagram, I don't see any plate.
Am I misinterpreting this?

 

[TractorTech]

That is a picture of the top cover or rockshaft. The plate is forward of that on the rear axle housing

 

[grcutter]

I removed the small plate that is in front of the lift cover.
Looking inside, I don't think that I was able to see the PTO gears.
In general, everything appeared to be OK from this view point but I have never looked in here before.
I'm posting the pics in case some sees something that I missed.
I'm wondering if I can remove the round collar on the PTO and look in that way. Is that possible?