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  #1  
Old 06-18-2017, 08:18 PM
pcampbell pcampbell is offline
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Default 2518 / Command CH18s low RPM

Another RPM issue. Seems like something fell out of adjustment. I mowed half of the lawn and after a break I went to start it up and it sounded like it was at about 1/2 throttle.

I tried playing with the throttle adjustment bolt (not sure of the official name for that but it's the adjustable bolt shown in this pic) to no avail.

If I grab the governor arm that has with multiple spring holes and manually pull on it slowly, it seems to rev up fine. Could anyone give me any pointers on what else I might try adjusting?

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Old 06-18-2017, 08:22 PM
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It looks like your "throttle adjustment bolt" is backed off way too much.

Check out my recent thread for some possible tips and pointers.

Also, word of caution: consult your owners manual and the engine technical manual before making any adjustments! That little bolt you are tinkering with can mean the difference between a 1000 max rpm and 5000 max rpm thus an exploding engine. Your best bet to get it right on since you've adjusted it thus far is to get a digital tach gauge and set it from there.

http://www.onlycubcadets.net/forum/s...ad.php?t=48993
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Old 06-18-2017, 08:28 PM
pcampbell pcampbell is offline
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Hmm.
I tried screwing it in but didn't seem to make a difference, maybe I didn't tighten it in enough. I will check it out tomorrow. Thanks.
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Old 06-18-2017, 08:45 PM
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Originally Posted by pcampbell View Post
Hmm.
I tried screwing it in but didn't seem to make a difference, maybe I didn't tighten it in enough. I will check it out tomorrow. Thanks.
It's also possible your gov arm came loose from the gov shaft that goes into the engine. Again, check with the service manual for the how to on resetting that
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Old 06-18-2017, 10:12 PM
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Looks like the throttle cable slipped in it's clamp and it won't allow the throttle to go wide open.
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Old 06-19-2017, 09:22 AM
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Looks like the throttle cable slipped in it's clamp and it won't allow the throttle to go wide open.
Good eye Sam! I'll second that.
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Old 06-19-2017, 10:36 AM
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Looks like the throttle cable slipped in it's clamp and it won't allow the throttle to go wide open.
Good catch, that's why you get paid the big bucks!

However, if he did adjust his high rpm bolt there, he's probably going to have to re-adjust it again
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Old 06-20-2017, 08:33 AM
pcampbell pcampbell is offline
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I will try the throttle cable clamp but it seemed like it was fine.

I tried tightening the high speed bolt all the way and it's not revving up.

If I manually pull on the gov arm and hold it , it will rev up, but MOST of the time immediately comes back down, occasionally it will stay rev'd up high even after I let go of the arm, so something is inconsistent.


I am wondering if the governor arm is slipping on the governor post coming out of the engine.
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Old 06-20-2017, 09:55 AM
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Originally Posted by pcampbell View Post
I will try the throttle cable clamp but it seemed like it was fine.

I tried tightening the high speed bolt all the way and it's not revving up.

If I manually pull on the gov arm and hold it , it will rev up, but MOST of the time immediately comes back down, occasionally it will stay rev'd up high even after I let go of the arm, so something is inconsistent.


I am wondering if the governor arm is slipping on the governor post coming out of the engine.
Sure sounds that way, best to check it sooner than later.
Adjustment should be covered in service manual
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Old 06-20-2017, 10:18 AM
pcampbell pcampbell is offline
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Went to check it out this morning and it rev'd right up like it should, so something is intermittent.

I tightened the gov arm - it was not super loose, but maybe not particularly tight, so hopefully that is it. It held for the rest of the mowing. I'll need a optical tach now to dial in the high RPM setting. What do I point it at for a good reading?
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