Hyster H50H:
Propane System

I have an old hyster h50h, it has the ford 192 in it. I believe that it was originally a gas truck, but was later converted to lpg. the problem is that the truck has no power in gear, can hardly go up a small incline. I originally thought it was a transmission issue but i believe that its actually a fuel problem. it will only rev in neutral and only with the pedal barley pushed. The truck has a century converter, it was taken apart cleaned and appears to be working. From the converter a line runs to a marvel schebler carb, that i can find absolutely no information on, that has a little nozzle on it. This nozzle has a rod connecting it to the butterfly on the carb, hitting the throttle opens a port and propane enters the carb. I also have a brass coupler in my air inlet system that has a 7/16 **** on it. Nothing runs to this although i was told that this could be a mixer. It has "Beam" cast into it. What i do not understand is how the system delivers the correct amount of propane based on engine condition. I would think that there would be some sort of vacuum controlled metering system but cannot find one. I also have a governor at the base of the carb that is completely shot, no arm connecting it to the butterfly and the diaphragm is no longer working as it wont hold any vacuum. Do i need a governor? I am a car mechanic so i have some ability but i am either over complicating this or missing something. My system looks cobbled together. Is buying an Impco system the way to go? Can i use my regulator/vaporizer with any lpg carb rated for my engine horsepower? I have photos i just see how i add them to this post.
  • Posted 4 Aug 2019 22:15
  • Discussion started by Spongebob
  • Washington, United States
Showing items 1 - 4 of 4 results.
It still runs but no rpms. You can get it to rev in neutral but anytime you mash the throttle it cuts out. You have to barely push it.
  • Posted 5 Aug 2019 10:24
  • Reply by Spongebob
  • Washington, United States
Does the motor act like it is shutting off when you try to go up a hill or does it keep running but no power even with the petal down?
  • Posted 5 Aug 2019 05:48
  • Reply by mrfixit
  • New York, United States
The govenor is stuck open so it cannot be the limiter. What I dont understand is how the inlet for the carb works. The rod on the carb only seems to adjust idle.
  • Posted 5 Aug 2019 01:20
  • Reply by Spongebob
  • Washington, United States
I'll try with a few comments after reading your post:
The governor is self contained and has it's own butterfly that could be broken and not opening or closing quickly when you try to throttle up.
If the Beam part does not have a hose connected to it, it is not being used as a mixer. Must have been from something previously used.
The rod on the carb is to adjust the fuel mixture. The valve that allows the propane to enter the carb must match how far the butterfly is open to make it run right. Try adjusting that to open the valve more compared to where the butterfly is position.
  • Posted 4 Aug 2019 22:52
  • Reply by mrfixit
  • New York, United States

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