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Old 03-30-2013, 11:03 PM
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Kohler command pros I have a question for you

I have an exmark navigator with the 27hp kohler command. I have an issue with the carb. I noticed fuel leaking out of what I'm guessing is the accelerator pump. Does anyone know what carb is on this unit? I need a diagram to find out what parts I need to replace. Can someone explain to me how the accelerator pump works?
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Old 03-31-2013, 09:05 AM
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Originally Posted by exmarkking View Post
Does anyone know what carb is on this unit? Can someone explain to me how the accelerator pump works?
I don't know about others but I don't guess when it comes to parts, Post the engine model AND spec numbers..... If the decal is wiped/missing look on the top of the carb for a part # configuration such as this XX-XXX-XX.....Then the carb can be properly identified and proper parts ordered....

The accelerator pump adds a extra amount of fuel to the engine for reducing bog going from idle to wide open speeds and when a load is applied.....
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Old 03-31-2013, 09:20 AM
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Thanks. Ill post some pics/parts numbers as soon as I can. I listed the type of mower and engine because they only used one type for this mower but I agree, part/model number def does help.
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Old 03-31-2013, 09:46 AM
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Well..... As I've repaired thousands of Kohler engines, I've only repaired two Exmarks (not common in my area) and know nothing of their build statistics..... But a quick look shows it likely has a CH740 in which the carb number will be stamped in the side of the carb body not the top as mentioned, See how easy it is to mess up when assuming without numbers and sight unseen ?
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Old 03-31-2013, 10:22 AM
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Yelp your right, I believe it's true that it is the ch740. If you give me a couple of hours I can look and take a pic. Will you be able to help if I get you that info? That would be great. The engine runs great, just noticed the other day that when the mower is turned off after mowing for a while I smelled gas so when I looked it was a puddle of fuel on the top of the carb where a little rod and rubber gasket is...assuming that's for the accelerator pump. The mower has 496 hours
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Old 03-31-2013, 10:31 AM
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Ok here are some pics for right now. The only number I saw by briefly looking was 953.




Here is the number and the little gasket that fuel was leaking out of


And another




All the linkages





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Old 03-31-2013, 11:11 AM
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The engine runs great

If the accelerator diaphragm was faulty the engine wouldn't run "great", Did you wipe that puddle off the boot with your finger and smell it to KNOW it's in fact fuel ?

Fuel is thinner than water and normally will not puddle like that, That looks like water/condensation inside the boot......
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Old 03-31-2013, 11:16 AM
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yes, in the picture that is water. It was raining earlier. But after running for a while, once the motor is shut down you can smell fuel and see it on that little boot. The mower cranks good, runs good. I think the fuel is leaking out of the hole in the boot where the rod is. I'm pretty sure it's just when it gets hot or is shut down because I've had it idling while emptying the hopper and haven't seen fuel.
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Old 03-31-2013, 11:22 AM
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So do you recognize this carb?
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Old 03-31-2013, 11:32 AM
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If it is fuel then you need part# 24 757 08-S diaphragm kit, The carb will have to be removed to install the kit so you may need part# 24 041 17-S carb mount gasket as well.....
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