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Shifting becomes heavy


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Don S at the Mack Museum once mentioned "slippery shit" used on the ball/socket at the cab shifter interface. Not sure what it is but you might send the Museum a note and ask the lube.

Ron - any suggestions?

BTW, my shift is "sloppy". Tight would be better. :whistling:

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Ken

HOF City, PRR Country, and Charter member of the "Mack Pack"

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Don S at the Mack Museum once mentioned "slippery shit" used on the ball/socket at the cab shifter interface. Not sure what it is but you might send the Museum a note and ask the lube.

BTW, my shift is "sloppy". Tight would be better. :whistling:

Ken do you have a 5 speed?

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Don S at the Mack Museum once mentioned "slippery shit" used on the ball/socket at the cab shifter interface. Not sure what it is but you might send the Museum a note and ask the lube.

Ron - any suggestions?

BTW, my shift is "sloppy". Tight would be better. :whistling:

There are only two grease fittings in the linkage, the ball socket on the shift rod up at the top of the shift tower and the and the "U" joint at the remote shifter on the transmission.

There are also two needle bearings and two roller bearings in the shift tower which aren't greaseable.

I'd just check and make sure everything is fairly tight without a lot of lost motion.

You can dab a little grease on the ball of upper shift lever where it enters the receptacle in the tower.

You can oil everything else in the tower.

There was also a phenolic or fiber bushing in the aluminum housing that the shift lever actually rides in.

There is a pin that holds the lever in the aluminum housing (about 5/16" in diameter with serrations on one end)

You can check the shock absorber from the shift tower to the air cleaner bracket.

It's just there to help isolate the tower, and even when they were wore out didn't didn't really effect the way they shifted.

Make sure to check that the beehive spring on the bottom of the shift lever isn't broken.

There is also a very heavy beehive spring located up in upper shift lever housing under the cab (under the rubber bellows).

This keeps the upper shift housing firmly seated in the shift tower.

This spring is not replaceable it's part of the upper shift housing that is attached to the cab with six screws.

I had one break before and ended up welding the spring, never had any more problems with it.

After that I bought a new assembly, just incase it ever happened again.

Murphy's law, when we shut down in 2010 the new one was still on the shelf.

The one I welded, well it's still working as of Macungie this year, last mileage I remember it having on it was about 1,973,000 miles.

Just getting broken in!!!!

Ron

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