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Questions about JD 420 Touch-o-matic


 
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mr.precision
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Location: Prescott, AZ.

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PostPosted: Thu Feb 08, 2018 11:03 am    Post subject: Questions about JD 420 Touch-o-matic Reply to specific post Reply with quote

Bit by bit fixing up this little jewel I picked up locally. My IT Manual isn't much use in learning how the dual TOM works. I will using this to brush hog 12 acres with a 5' rotary mower when the light restoration is complete.
For simple up-down operation, is the lever under the seat supposed to face forward or backward?
Does one need to use both levers to raise and lower the implement? Or just the outer lever?
Should the left 2 lift arms be pinned together?
I know this is basic stuff, but the info on the web is contradictory and I'l like to have someone that uses the 3 point lift to give me a few pointers.
Thanks

 
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mr.precision
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PostPosted: Thu Feb 08, 2018 11:05 am    Post subject: Re: Questions about JD 420 Touch-o-matic Reply to specific post Reply with quote

Lift levers - dual TOM.
 
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ET
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PostPosted: Thu Feb 08, 2018 11:13 am    Post subject: Re: Questions about JD 420 Touch-o-matic Reply to specific post Reply with quote

The arms should be pinned together and the outer lever runs everything. On my 40 I think the lever on the left is in a position that lets the pin pop out of the housing but I can't remember which way that is.
 
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Stroby
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PostPosted: Thu Feb 08, 2018 11:25 am    Post subject: Re: Questions about JD 420 Touch-o-matic Reply to specific post Reply with quote

The manual on my 430 says to pin them together, switch the knob under the left side of the seat, then put the left lever (nearest the seat) all the way back, then use the right lever to operate the 3 point.
 
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buickanddeere
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PostPosted: Thu Feb 08, 2018 12:27 pm    Post subject: Re: Questions about JD 420 Touch-o-matic Reply to specific post Reply with quote


This would be the time to obtain a real JD operator’s manual and toss that pos IT manual in the burn pile .
When flipping the lever under the seat , make certain that the valve actually slide in it’s bore.
Transmission driven PTO?
 
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Rusty wheel
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PostPosted: Thu Feb 08, 2018 2:53 pm    Post subject: Re: Questions about JD 420 Touch-o-matic Reply to specific post Reply with quote

With the lift levers pinned together, the lever under the seat should be pointed forward and only the actuating lever on the right should be used. I tied the one closest to the seat back with a tie wire. When the levers are pinned together, youre using both cylinders for lifting increasing the lift capacity. In addition, U should back out the adjusting bolt on the back side of the bracket that holds the top link. Doing this eliminates the three point from automatically lifting under a heavy load..I used this feature at a plow day while plowing up a rock garden and ruined my hydraulic pump. Had to get a new pump and rebuild the tom.
 
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James Howell
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PostPosted: Thu Feb 08, 2018 4:39 pm    Post subject: Re: Questions about JD 420 Touch-o-matic Reply to specific post Reply with quote

"like to have someone that uses the 3 point lift to give me a few pointers."

Reviewed the OPERATOR'S MANUAL OM-T2-455 JOHN DEERE TRACTOR MODEL 40 in the OPERATING TRACTOR section under the DUEL TOUCH-O-MATIC on pages 27 and 28.

Take a look at the information below.




Take a look at the photos below of "BW" our 54 Model 40T.


Note the selector lever is in the forward position.



Note the lift arms locked together by the lock pin.



Note the load control screw is in.

This is the 2nd way discussed above: Parallel Cylinders with Load-and-Depth Control.

Hope this helps.
 
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jsborn
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PostPosted: Fri Feb 09, 2018 5:23 am    Post subject: Re: Questions about JD 420 Touch-o-matic Reply to specific post Reply with quote

Send me an Email and I can prob set you up with a better source of Info than the IT manual.
 
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mr.precision
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PostPosted: Sun Feb 11, 2018 4:47 am    Post subject: Re: Questions about JD 420 Touch-o-matic Reply to specific post Reply with quote

Thanks to all for the detailed explanation. Only observation made is the selector lever - it doesn't appear connected to anything. There nothing behind the lever, which can be seen in my first picture. Don't know if something is missing or the "detent pins" are stuck in the housing.
Believe the tractor was operated for some time with the lever to the rear, but who knows. Right now the lift seems to work just fine with the inner position lever all the way up, and the outer lever used to raise and lower the implement.
 
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James Howell
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PostPosted: Sun Feb 11, 2018 6:05 am    Post subject: Re: Questions about JD 420 Touch-o-matic Reply to specific post Reply with quote

"Only observation made is the selector lever - it doesn't appear connected to anything."

Take a look at the TOUCH-O-MATIC CYLINDER AND VALVE HOUSING diagram below.


Note the bottom crossover valve (Key 9) and top crossover valve (Key 10).

Reviewed the SERVICE MANUAL SM-2013 JOHN DEERE 40 SERIES TRACTORS & CRAWLERS under the Group 10 DUAL TOUCH-O-MATIC section in the CYLINDERS PARALLEL RAISING POSITION on page 108-10-9.

"The selector crossover valves are open with pressure oil passing through crossover passages to both cylinders to equalize the pressure against each piston."

When the selector lever is in the forward position, the crossover valves are open.

Hope this helps.
 
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