The Craftsman manual states that the idle should be set at 1,750 RPM's, however there is no mention of the "No Load" High speed RPM other than it has been factory set.
The Kohler manual recommends that the idle should be set to 1,200 RPM's and that the "No Load" High speed RPM should be set at 3,750 RPM's but to refer to the manufactures instructions for specific info. So now what?
My idle speed was found to be 1,500 RPM's so I bumped it up the Craftsman manual spec of 1,750 RPM. The "No Load" High speed RPM was found to be around 3,100 RPM. I felt that seemed a little low and bumped it up to 3,500 RPM.
What do you guys think about those RPM numbers?
Note that I'm not arguing against your reasoning. I'm merely explaining aspects in order to add clarity and understanding to the situation.
The Kohler specs are for the engine to cover all
applications. End use manufacturers are free to use any speeds that fall within Kohler's specified speed range. Tractors are not the only application. The engine may also be used to power water or hydraulic pumps, portable sawmills, generators, cement mixers, etc., etc., each with a different high, and/or low, idle requirement. The Craftsman specs are for the limitations of the various implements that can be attached to the tractor
, as well as for the transmission.
If you clean the governor components (flywheel fan, air vane) to ensure "as new" air flow and replace the governor spring due to the possibility that it has been stretched or weakened, it should
result in the "as designed for the specific tractor" high idle, unless different linkage holes have been used to change the original setting.
I have seen comments quoting specs for other L&G tractors with high idle speeds ranging from 2800-3600 rpm, and some generators have a high idle of only 1800 rpm. If you dig deep enough, you can usually find the reasons for the differing high idle rpms.
Two of the things that I don't mess with without a thorough understanding of the effects on other components are governors and hydraulic relief valves. In both cases, excessively high numbers sooner or later result in broken parts.
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