2630 John Deere throttle govenor hand and foot linkage

2630 John Deere

Problem was that the hand throttle would not work. Temporary fix, for 20 years, was some heavy wire wrapped around the three fingers which hook the foot and hand linkage to the shaft going under the battery.

A few days ago, I decided I was going to repair it properly, little knowing how much it was going to stump me. Having a neighbor's 2030 to look at helped some, but I had to think about it quite a bit before figuring out the problem.

I'll add some pictures later.

Part of the governor linkage to the fuel injection pump, is a shaft which passes under the battery floor. The shaft has two holes in the end for 5/32" pins. There are 3 cast pot metal fingers which slide over the shaft where the holes are, and there is a spring in between the inner and middle fingers.

The purpose of this apparatus is to provide spring resistance and return to the accelerator pedal, while also moving and indexing the accelerator pedal as the hand throttle is moved.

The inner and outer fingers each have tabs which butt up against the middle finger. The fingers and the spring are arranged in a critical manner not well described in the workshop manual.

What is confusing to someone going blind into this, is that the shaft has two holes for 5/32" roll pins, but only one hole is used.

Although there is a pin hole in all three fingers, only one finger, the middle one, actually gets a pin to the shaft. This can throw you.

That one pin is is a 5/32" x 7/8" roll pin. I opted for a stainless steel bolt, I think it was metric, the same diameter, about an inch long, with a nylon locknut on the end, to do the place of the roll pin. It was a bear to knock out that old roll pin and I am not going to go through that again. Plus, it will all come apart easily next time I need space to replace that dreadfully placed tach cable.

With wear and tear where the shaft rotates in the two sheet metal holders bent down off the battery cowl floor, the length of the shaft past the right side holder becomes effectively longer by 2-3 mm, and the inner finger, which is part of the hand throttle linkage, which is under spring tension, can slip past the holding tab on the middle finger, making the hand throttle useless. A little bit of wear on the ID of the finger where the shaft goes through it, is part of the problem, too, because that makes it wobble.

At first, looking at the apparatus, one might think that a roll pin in the inner finger came out or broke, but the inner finger, as well as the outer finger, float freely on the shaft.

It is the movement of the inner finger [b:ee0e31d9d3]tab[/b:ee0e31d9d3] against the middle finger which caused the shaft to rotate.

Likewise, the tab on the outer finger moves the shaft when it abuts the middle finger. The middle finger is the anchor.

There are also two plastic grommets which fit the shaft holes in the sheet metal holders under the battery. The shaft is 3/8" and the hole it goes through is 7/16", so the bushing is quite thin.

What I did was shim fingers tighter against each other by putting washers between the inner finger and the holding grommet. This made it impossible for the tab on the inner finger to slip past the abutment tab on the middle finger.
 

Yes throttle linkages on JD utility tractor of that era are somewhat complicated. I agree the groove pins are a BEAR to R&R. I'm glad you got it figured out.
 
Thank you for your comment.

My guess is that the extra hole in the shaft was in case someone wanted to delete the pedal throttle and just use the hand throttle. The pedal, linkage, spring, and two of the "fingers" could be deleted. The inner finger for the hand throttle would be pinned to the shaft and it would be very simple.

I rarely use a foot throttle, especially on a diesel.

Here is a picture of the finished linkage repair. A picture conveys the arrangement better and faster than words. You can see my two washers on the shaft used to squish the fingers together tighter. There is a plastic bushing for the shaft behind the washers you can't see, keeps the shaft from rubbing on the holder.
IMG_5648_zpsefk6z0i4.jpg
 
Picture of the middle finger. This is the only of the three fingers which is pinned to the shaft. Picture of the metric stainless bolt with a nylon lockwasher, which I found at one of the better local hardware stores.

The inner and middle fingers need to be squished together so the triangular tab on the inner finger does not slip out from behind the middle finger.
IMG_5642_zpso3unpuqp.jpg
 
Picture of the shaft. Note the two main holes. Ignore the smaller hole on the end--I put it there, a mistake made trying to figure things out.

The inner hole is for pinning the hand throttle lever linkage when the acc pedal is deleted.

The outer hold is for pinning the middle finger, which acts as an anchor for the spring and as a "backstop" for the other two linkage fingers.
IMG_5607_zpsrv3pq5ey.jpg
 
Just to add some final information: the bolt I used was stainless M4 x30.

It stuck out a little too long so I cut it down to 25mm. Used a nylon stainless locknut with it.

The two thin plastic grommets for the cross shaft were JD part number T22241; my cost at the dealer for both was $11.02 (extremely high cost for such a simple part, I thought).

The spring pin, which I did not use, is JD part number 34H264.
 

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