John deere H

[a49deere]

Just acquired a 1942 JD H. Could someone possibly get me a picture of how the foot throttle linkages hook up! Also, what is the purpose of the duplex control on the power lift? Does it allow you to select between two outlet ports? Thanks

 

[JIM MN]

If you do not get a picture of the foot throttle, look on John Deere parts site for JD-H, parts catalog 304 under picture 18 throttle controls. Shows pictures of throttle linkage and the pedal linkage.

 

[dan_41jdh]

The parts illustration is what Jim MN mentioned. Spring #6 hooks into a tab on the back of the belt pulley dust shield.

The other picture is of instructions for mounting and using the Duplex Valve. As described in the text, it was first intended for the two-way integral plow, model H-3, then the later H-4. It was also needed for the the H-10 two-way integral plow.

 

[a49deere]

thanks Dan! I have everything but spring #5. Previous owner used mechanics wire in its place! As I see it, foot pedal does nothing more than bend the throttle spring to increase speed, then throttle does not return to speed it was before using foot throttle. It moves the throttle control on steering support also! Does that sound about right? This is all new to me, never had a foot throttle on a two cylinder!

 

[dan_41jdh]

thanks Dan! I have everything but spring #5. Previous owner used mechanics wire in its place! As I see it, foot pedal does nothing more than bend the throttle spring to increase speed, then throttle does not return to speed it was before using foot throttle. It moves the throttle control on steering support also! Does that sound about right? This is all new to me, never had a foot throttle on a two cylinder!

No, the foot throttle will not move the hand control throttle lever from its set position.

Keep in mind that “The purpose of the Accelerating Pedal is to make possible faster travel speeds to and from the field and for transporting purposes. Under no circumstances should the Accelerating Pedal be used for field work.” (statement taken from an early operator’s manual which uses the term “Accelerating Pedal” in lieu of foot throttle) The intended use of the foot throttle is to increase the normal governed high speed from 1400 RPM to 1800 RPM, thus giving the “H” a “fourth gear”, and it is not intended or designed to be used at lower engine speeds or to substitute for the hand throttle control.

Referring to the parts illustration below, when the engine is running at low idle speed and the hand lever is set to (let’s say) the wide-open throttle position, the carburetor will open completely until the governor works against the #31 single-leaf spring and closes the carburetor enough so the engine will run at governed high speed. Then, if you wanted, you could reach down and pull the #32 governor arm to the rear a little bit which would open the carburetor a bit more and that would result with increased engine speed. By doing this, you are effectively helping that #31 leaf spring by increasing the total “spring force” against the governor.

Essentially, that is what the foot throttle is doing. That #5 spring is of a critical size and design and will exert just enough additional force when the foot throttle is depressed (in addition to the force of the #31 single-leaf spring) to slightly override the governor to result in an extra 400 RPM of engine speed.

When the foot throttle is released, the spring force from spring #5 is eliminated and the governor has to work against only the single leaf spring #31. The spring #6 is not a critical size or design – it simply keeps the foot lever in an “off” position against its fixed stop to ensure spring #5 is totally relaxed if the foot throttle is not depressed.

Some trivia – the patent for this foot throttle states in part: “It is sometimes desirable to operate the engine at a higher speed than the maximum permitted by the governor as, for example, when transporting the tractor over the highway, or otherwise operating under light load, and with this in mind, it is the principal object of the present invention to provide adjustable means, under the control of the operator, for regulating the throttle or other speed regulating means to accelerate the engine up to the maximum speed of which the engine is capable for any given load. One of the advantageous features of my invention is that it is possible to accelerate the engine momentarily for a burst of speed without disturbing the setting of the governor adjustment, and the normal operating engine speed is automatically resumed upon release of the engine accelerating means.”

 

[a49deere]

Wow a lot to digest! I will have to look at this closer! So, what I'm concluding from what you're saying is it can only be used at wide open throttle! Thank you for the detailed explanation!!

 

[41B-boy]

Dan,
I always learn so much from your posts and replies. Thanks for sharing!
BTW, I'm still looking for an H. My bride wants electric start since she's under the impression it will be hers, Anyone with an H that needs a new barn, send me a note.
Fr. Bob

 

[dan_41jdh]

So, what I'm concluding from what you're saying is it can only be used at wide open throttle!

Not necessarily. The INTENT of the foot throttle and why it was provided was for a "fourth gear" as a transport speed by deliberately overspeeding the engine. However, you can depress the foot throttle at any engine speed or hand throttle setting and the governor and engine will respond accordingly without consequence. But Deere was adamant that it "not be used for field work". (Of course, no one ever did, haha.....)