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Throttle linkage

S

sony224422

Member
Hey I got my '48 h running really well, but the last part I'm having trouble is with the saw tooth throttle. When its WOT, there is still more throttle I can pull to get it to really WOT. where do i adjust this? Is it in the governor? It seems like it needs another tooth or two.
 
There is an adjustment in the rod length where the long rod
connects to the little bracket on top of the head by the manifold. I
can't recall which way you need to adjust it but I think once you
look at it it will make sense.
Zach
 
Remove all of it. Soak it in PO. wirebrush it well. Use the compressor air on it. Clean with prepsol, paint and reinstall as good as new.
Do the rods while you are at it.
That's how you get your tractor restored piece by piece
 
There are two springs in that link attachment. They can be replaced with similar hard ware store springs. The governor control lever needs to be all the way to the end of its travel when the throttle lever is in the last to next to last saw tooth notch. Week rusty springs are probably part of the issue. Jim
 
(quoted from post at 20:25:17 01/30/14) There are two springs in that link attachment. They can be replaced with similar hard ware store springs. The governor control lever needs to be all the way to the end of its travel when the throttle lever is in the last to next to last saw tooth notch. Week rusty springs are probably part of the issue. Jim
Click to expand...

I replaced the spring in the governor already. I'm wondering if I do need the adjust the rods. Is it possible to over rev these engines making adjustments? I'm not saying i want to, I mean that as in I don't want to do damage
 
The springs I refer to are not inside the governor, they are in the throttle linkage at the cylinder head (where the linkage pushes and pulls on a "bell crank" those two springs are often weak/compressed and not allowing full linkage travel. Jim
 
(quoted from post at 06:58:52 01/31/14) The springs I refer to are not inside the governor, they are in the throttle linkage at the cylinder head (where the linkage pushes and pulls on a "bell crank" those two springs are often weak/compressed and not allowing full linkage travel. Jim
Click to expand...


Oh I think I know where they are. I will check them
 
(quoted from post at 07:20:52 01/31/14)
(quoted from post at 06:58:52 01/31/14) The springs I refer to are not inside the governor, they are in the throttle linkage at the cylinder head (where the linkage pushes and pulls on a "bell crank" those two springs are often weak/compressed and not allowing full linkage travel. Jim
Click to expand...


Oh I think I know where they are. I will check them
Click to expand...

I did some adjusting, but I have one spring almost compressed and one loose and almost no more threaded rod, I need a little more I think unless I'm adjusting the rod the wrong way. I don't get what the springs are meant for?
 
The springs are meant to cushion the hand lever a little. This allows the throttle hand lever to be pulled so that it guarantees the governor arm is pushed to its max position. The spring (which pushes on the little bracket compresses some to assure the governor is wide open.
Wear on the pivot points and linkages, can cause the rod to be too short.
If you remove the linkage from the pivot with springs, so the governor control arm on the back of the governor can be moved to its maximum (against internal spring pressure), and tie it there, you will be able to adjust the hand lever and the spring system for full throttle at the next to last notch. (the spring to ward the drivers seat (IIRC) will be somewhat compressed in that position) Jim
 
Remember to remove the cord or wire used to hold it open, or it will be as though the hand lever is all the way back. It won't over speed, it will just go to High Idle, which is as fast as it is supposed to be able to go with no load. Jim
 

I just wanted to give an update.. I figured out why I couldn't adjust anymore. Someone welded the last 4 teeth shut! No wonder why it seemed to want to travel farther. I took the other one off my parts tractor and i can make the correct adjustments now.
 
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