hand throttle

What are the symptoms?

While we’re on the subject, my hand throttle on a 2007 Jinma 284 quit holding its setting quite some time ago. Keno said it was a broken spring, but nothing about where this spring might be  (can’t find any empty spring holes in the linkage or anything broken). Real head scratcher. In the meantime I lay a loader valve hose over it to hold it in place until it warms up. Between taking care of 11 chickens, a rabbit, 3 cats, a dog, my wife with her MS, taking the daughter to school, shopping, cooking, cleaning, gardening, running a business, and my heart failure I can’t seem to find the time to diagnose this problem  :unsure:

Guitarman,

Not exactly sure what you are asking. The hand throttle sets the engine speed and pulls the foot throttle along with it. The foot throttle can then be used to increase the engine speed and when released it will return to the speed set by the hand throttle. Please explain what you need accomplished.

Tinbender,

My tractor exactly. The parts book indicates they used two slightly different setups. From what I can tell, one has a full sized foot pedal hinged on the floorboard and the other has a small foot pad attached to a rod that is “free floating”. I have illustrations of both that I can scan and post. Neither have any springs in the system. I have the second type and when the hand throttle got to the point that it would not stay where I put it I tightened the double nut on the bolt that holds the chromed hand throttle to the tractor. This added enough friction to hold it in place.

I can also take pictures if you would like.

Hope this helps.

Additional info: The two types listed in my parts book are listed as II and III. What was design I?

I found a different diagram here:

https://www.circlegtractorparts.com/engine-control-mechanism-throttle-linkage/engine-control-mechanism

Since there is no number designation I am guessing it was the first design. This setup did use a compression spring to apply friction to the hand lever. This was a completely different design than the later two and was apparently for a shuttle shift setup.

There is a small foot throttle return spring on mine (type III) that is not listed in the parts book. It would have no effect on the hand throttle. There is a cushion plate # 184.20.107 that provides friction to the lever.

Sounds like I have the same one you do, no wonder I can’t find the non-existent spring. I’ll try your fix, thanks.

Just wanted to say I was having the same issue (lever not staying put) on my Jinma 254 and tightening the double nut remedied it.