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Massey Harris & Massey Ferguson Tractors Discussion Forum

MF 4840 Clutch Transmission Brake Adjustment

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Dennis Bush

03-25-2004 16:22:16

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Does anyone have any experience adjusting the clutch and transmission brake on a 4840? I have the shop manual and did like it said. I can't tell any difference when I turn the adjustment ring either direction. Right now I have to start the tractor in gear and then I can shift. Any help would be appreciated. Dennis Bush

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MF Kid

03-28-2004 06:56:01

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Re: MF 4840 Clutch Transmission Brake Adjustment in reply to Dennis Bush, 03-25-2004 16:22:16

Dennis, the clutch in your tractor if it is the big 4wd 4840, is a wet clutch. These are a bear to fix as you have to remove the transmission in order to service the clutch. If you are not having any luck in adjustments then, I recomend you find a reputible MF tech and look at replacing the clutch assembly. The trans is very large and heavy. I wish I could give you more info about this but, it has been too long ago that I did such repairs on 2 of them if I remember correctly. Had to roll cab backwards on the frame to get it out. Cab is on rollers.

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twopop

03-25-2004 19:52:20

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Re: MF 4840 Clutch Transmission Brake Adjustment in reply to Dennis Bush, 03-25-2004 16:22:16

I dont have a book on the 4840,but by your statement about the ring and the brake,i believe you have a spicer 2 plate clutch,like those used in a class 8 18 wheeler.the biggest problem i have run into is when someone tries to adjust these when they dont know how.the release linkage should never be changed once the unit leaves the factory.turn the engine until the lock bolt of the clutch is at the 6 oclock position.remove the lock bolt.do not move the engine or start it with the bolt removed.release the clutch with a rod or someone to hold the pedal down.turn the ring in a clockwise direction.about four clicks at a time and then engage the clutch to check dimensions.when adjusted porperly there should be a space of 7/16 of an inch between the rear of the release bearing and the clutch brake disc.keep releasing the clutch and moving the ring clockwise until you have the proper dimension.when you have it install the locking tab and bolt.then if someone has changed the linkage sometime you will need to readjust the linkage.when i say clock wise,that would be looking from the rear of the tractor,toward the radiator.

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