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Massey Harris & Massey Ferguson Tractors Discussion Forum
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MF35 difficult shifting

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Shawn Church

04-16-2008 08:12:15




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Thanks to everyone on the clutch adjustment I posted a few days ago, I now have 1/2 inch or less of free travel in the clutch pedal, and I feel the second stage clutch at around 1/3 to 1/2 down.

It is much easier now to disengage the PTO, and I had a little grinding in second and third gears which is gone now.

I am still having a problem however shifting into first and reverse from neutral. I have to shift to third and then quickly up and over into reverse. After in reverse, I can easily shift back and forth between first and reverse. This happens whether or not the engine is running.

Looks like the next step is to pull the trans cover to take a look at the shift forks and shifter rod itself. On the 8N, this is easy to do, but on the 35 it looks like the dash and entire steering column have to come off. Are there any tricks to this? It looks straight-forward, but I would like to avoid any surprises.

I already have a trans cover gasket (figured I would have to do this sooner or later), but does anyone know of any likely culprits inside the gearbox? I've searched extensively through the archives, but I haven't found this problem mentioned.

Thanks,
Shawn

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DavidP, South Wales

04-16-2008 11:57:54




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 Re: MF35 difficult shifting in reply to Shawn Church, 04-16-2008 08:12:15  
Hi,
Don't take thr trans cover off yet. Have you tried pushing the clutch pedal to the bottom of the second stage to change gear? If this is easier it suggests two possibilities. First you may not have quite enough operation on the first stage. Secondly there might be a film of oil on the clutch plate making it sticky and causing it to drag. Try pressing the pedal fully and waiting several seconds. If this helps it looks more like clutch than selectors etc.
DavidP, South Wales

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Shawn Church

04-16-2008 12:32:37




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 Re: MF35 difficult shifting in reply to DavidP, South Wales, 04-16-2008 11:57:54  
David,

Yes, I've tried this, but I've never once been able to shift from neutral to either first or reverse at any clutch pedal position, engine running or not. I would think if the clutch is dragging I would be grinding gears going into second and third (which was the case before I adjusted the clutch). It just feels like the shift lever won't go far enough toward the left to engage, so I wondered if maybe the bottom of the shift lever is worn or bent. Can this be removed without pulling the cover?

However, I did notice while brush hogging that when I pressed the clutch pedal all the way down with the blades still spinning that it would grind shifting into second or third. After the blades/PTO coasted to a stop, the grinding went away. Not sure if this is normal, but I thought I would mention it.

I bought a CD-based shop manual, but unfortunately the gearbox pictures are terrible and there is no exploded drawing.

Thanks,
Shawn

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Jack in NB

04-16-2008 15:43:32




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 Re: MF35 difficult shifting in reply to Shawn Church, 04-16-2008 12:32:37  
Hello Shawn -

There are a couple of other possibilities that have caught us in the past.

First - the center of the traction clutch deformed by someone pulling the tractor together with bolts after a split, without properly engaging the splines. On ours, the center was pushed forward just enough to rub slightly on the flywheel - just enough contact to keep the plate spinning so it would grind. You could just barely see the rub mark on the plate hub. Took three splits to find that @#ZZ@#$X.

That action was independent of the PTO clutch behaviour.

The second possibility - runout in the clutch plate. On the previous mess, we finally replaced the plate with a rebuilt. Back together - properly this time, under my fussy supervision - and the sucker still wouldn't release properly. Fourth split. Warped plate- 1/8" wobble.....

That's called EXPERIENCE.....

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DavidP, South Wales

04-17-2008 00:56:38




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 Re: MF35 difficult shifting in reply to Jack in NB, 04-16-2008 15:43:32  
Hello,
Jack's comments are certainly a possibility. It is not uncommon to have to wait several seconds for the gears to engage without forcing them.
Is there much turning movement in the rear lever? Whilst the bottom will wear a greater degree of wear takes place at the gearlever pivot. The pin becomes worn and the slot in the gearlever becomes elongated. This usually leads to the tractor sticking in gear with the GL loose.
It is necessary to remove the cover to gain access to the cup, pin and lever.
DavidP, South Wales

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Shawn Church

04-17-2008 07:52:17




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 Re: MF35 difficult shifting in reply to DavidP, South Wales, 04-17-2008 00:56:38  
I removed the trans oil plug last night to watch the shifter movement. I'm not sure of all of the terminology since I don't have a parts breakdown, but I'll try to describe exactly what I see.

There is a large "yoke" with a square-headed set screw in the top (this is the first thing you see when removing the oil plug). This yoke is engaged by the end of the shifter.

When shifting from third to reverse, the yoke is repositioned slightly downward and left. In this position, I can shift easily between reverse and first. Immediately as I move the shifter toward neutral, this yoke repositions itself slightly upward and to the right. In this position, I can still shift easily between second and third, but not to reverse or first. I have to repeat the movement from third to reverse for the yoke to again be repositioned slightly downward and left.

Unless you know of anything else to check, the next step will be to remove the cover to get a better look inside the gearbox. Are there any shortcuts or tricks for this? It appears I have to remove the dash, which involves disconnecting all the wiring, cables, and throttle lever. Doesn't look like the steering wheel needs to be removed, since I think everything will come off together.

Thanks,
Shawn

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