H with extra shift lever

ljw

Member
I am looking at an old H as to use a parts tractor for my other H and noticed it has an extra shift lever and linkage on the clutch pedal side of the tractor just in front of the clutch pedal. What is it for and does it add any value, parts wise?
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Most likely it is an overdrive. Desirable? Yes, but since the tractor has already been relegated to the "parts donor" category, the overdrive probably would not add much value.
 
I would make sure it functions, then use that differential/trans on the good H. They provide 4 additional speeds between 4th and 5th. If you can turn the wheel/axle to turn the trans in 5th with the clutch pushed down, you can check it as follows: Put it in 4th, clutch blocked down. Pull the PTO lever up to put it in PTO. Make a mark on the PTO shaft, and a mark on the wheel with a white chalk or soap stone. Mark the bottom of the wheel and top of PTO spline. Rotate the wheel one turn counting the turns of the PTO. (mark it down) Now move that lever to change ranges. Rotate the wheel one revolution again. THe PTO count should be very different. (I don't know which way the lever is positioned now, it could be in standard speed (probable) or Over Drive. Thus moving it will change the PTO count but I can't tell you which way faster or slower. Faster is overdrive, slower is standard speed. It is important to read up on the use of the OD because the hydraulics and PTO are speeded up and can damage things if used while in OD. Jim
 
Thank you all. This is a 1940 H and it does run and drive. Tires are shot 1 rear rim bad. It has some parts that if I buy individually will equal as much as I can buy the whole thing so I think I will buy it. I assume this OD is an aftermarket component. Not sure that I will use it though. What would be an average selling price for the OD section if I don't use it?
 
It is built into the trans and is removable but would be better off sold as a unit. It is an over drive in the sense that it changes the speed of all 4 lower gears. It does not change 5th because it is direct to the output. If it is operational, it would sell for the value of a different H (assumes it is the entire rear of the H being sold as one thing) without it. (Me, I would use it in a heartbeat)
 
There is a little misinformation here, not extremely important to the fact that Jim is ponting out. The main fact being is that changing the lever changes the speed the PTO turns to indeed prove the additional 4 speeds are there and fuctioning when the wheel is turned. The fact that he gave you that is incorrect is that when turning the wheel the position that makes the PTO turn faster is the stock transmission speeds. The PTO is showing you a reduced equivalent to engine speed. So simply put in a faster gear the engine turn slower in relationship to the speed of the wheel. My apologies to Jim.
 
I must respectfully agree"ish". (fun thinking non confrontational)
According to the chart under the diagram provided below, the PTO is linked directly to the speed of the countershaft 1:1 ratio. Therefore the PTO speed is proportional to ground speed in each gear, Reverse through 4th whether in OD or normal. It is just that the ground speed is higher in OD that the PTO and Wheels and PTO go faster in OD. The position of the OD lever will make no difference, those OD shifting gears are before the countershaft. (remember we are turning a back wheel) In 5th the output shaft (From our wheel turning) is now directly driving the OD gears, and none of the Rev through 4th are involved. The counter shaft countershaft now turns faster than it does in factory range, turning the speed of the PTO proportionately higher. So in any gear except High, the PTO will not change the number of splines going by whether in OD or standard (they will change between the Rev and 1-5) In 5th they will act like I indicated in the post I wrote. Interesting reality. Jim
 
Had one on an M was handy at times also in overdrive it also sped up the pto a lot so depending on what you were doing with PTO the hi-speed was another feature
 
The Heisler 9 speed will also speed up the hydraulic belly pump if the tractor is equipped with hydraulics. My Farmall M with a Heisler 9 speed has a disconnect device installed between the hydraulic pump and the transmission so that the pump can be disconnected when using the increased Heisler speeds, Hal.
 
The serial number tag has an X1 and I believe the X means High speed low and reverse attachment. Does this refer then to the Heisler 9 speed device?
 

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