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post #1 of 20 Old 05-18-2017, 02:42 PM Thread Starter
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Kohler Command 25 (CV730s) Ball bearing in Carb?

After changing oil and filter this spring, a ball bearing fell out of the carb. Where does it go? I assume it's part of the fuel shut off solenoid since it will backfire occasionally if I shut down without idling at low RPM for 5 seconds or so... It runs fine otherwise.

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post #2 of 20 Old 05-18-2017, 03:01 PM
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Re: Kohler Command 25 (CV730s) Ball bearing in Carb?

Some carburetors...most I have worked on over the years have "Orifice" that have a ball bearing type of plug that is pressed into the casting to seal and opening for a optical fitting.

From looking at the Kohler Command 25 (CV-730 ) fuel system on this engine, I see there might ne two such plugs.

Here is a breakdown on this engine.


file:///C:/Users/FRED/AppData/Local/Microsoft/Windows/INetCache/IE/G2DMT23Z/Kohler-Service-Repair-Manual-Command-CV17-CV18-CV20-CV22-CV25-CV22-CV23-CV26.pdf
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post #3 of 20 Old 05-18-2017, 03:30 PM Thread Starter
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Re: Kohler Command 25 (CV730s) Ball bearing in Carb?

Quote:
Originally Posted by Been There View Post
Some carburetors...most I have worked on over the years have "Orifice" that have a ball bearing type of plug that is pressed into the casting to seal and opening for a optical fitting.

From looking at the Kohler Command 25 (CV-730 ) fuel system on this engine, I see there might ne two such plugs.

Here is a breakdown on this engine.


file:///C:/Users/FRED/AppData/Local/Microsoft/Windows/INetCache/IE/G2DMT23Z/Kohler-Service-Repair-Manual-Command-CV17-CV18-CV20-CV22-CV25-CV22-CV23-CV26.pdf
Thanks. the ball is probably little smaller than 10mm from what i remember.

Your PDF did not upload.

I did not see a check ball in these diagrams on page 25. shown here:

http://www.kohlerengines.com/onlinec..._24_690_07.pdf

John Deere G100, 54", Kohler Command 25
JD 46" snow Blade

Stihl 031AV (WIMA cap, base gasket delete) 20"
Echo CS-590 (MM) 20"
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post #4 of 20 Old 05-18-2017, 03:38 PM
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Re: Kohler Command 25 (CV730s) Ball bearing in Carb?

The link I sent you is basic the same as you have shown. From the link you shown, I don't see any place in or out side of the carburetor where a ball bearing would be located.

Are you positive that the ball bearing came from the carburetor? How did it show up when you change the oil and filter? Beall bearing don't hang around an engine very long when I become loose or fall out of their position.
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post #5 of 20 Old 05-18-2017, 04:31 PM Thread Starter
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Re: Kohler Command 25 (CV730s) Ball bearing in Carb?

Fell right out of the air filter to the ground. I see it happened to someone else too, but no answers:

A ball bearing fell out of my Kohler CV470 lawn tractor engine.

air cleaner on a kohler engine

John Deere G100, 54", Kohler Command 25
JD 46" snow Blade

Stihl 031AV (WIMA cap, base gasket delete) 20"
Echo CS-590 (MM) 20"
Husqvarna 128LD Trimmer
Giant Vac w/ 6.5HP Predator Engine
Unknown 1980's Japanese backpack Blower with Kawasaki engine
1968 M35A2

Last edited by Merc1973; 05-18-2017 at 04:40 PM.
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post #6 of 20 Old 05-18-2017, 05:00 PM Thread Starter
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Re: Kohler Command 25 (CV730s) Ball bearing in Carb?

It might go here at shown in picture #15 as Been There has stated

Disassembly, Cleaning and Repair of Kohler Command V-twin Nikki Carburetor

I will check that tonight after work.

John Deere G100, 54", Kohler Command 25
JD 46" snow Blade

Stihl 031AV (WIMA cap, base gasket delete) 20"
Echo CS-590 (MM) 20"
Husqvarna 128LD Trimmer
Giant Vac w/ 6.5HP Predator Engine
Unknown 1980's Japanese backpack Blower with Kawasaki engine
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post #7 of 20 Old 05-18-2017, 05:09 PM
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Re: Kohler Command 25 (CV730s) Ball bearing in Carb?

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It might go here at shown in picture #15 as Been There has stated

Disassembly, Cleaning and Repair of Kohler Command V-twin Nikki Carburetor

I will check that tonight after work.

Just as I thought in my first posting, a ball plug has come loose, and there is a "Ball Plug" that sealed a passage, and it has fallen out. That would be #15 Photo, and the ball in the blue square. Just get you some JB Weld and put the ball back it hole. Your are lucky that didn't end up inside the intake and engine.
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post #8 of 20 Old 05-18-2017, 05:10 PM
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Re: Kohler Command 25 (CV730s) Ball bearing in Carb?

Check the fuel spit cup on the carb side a BB is pressed in place if there is no hose from separator going to it. If you have a hose going to spit cup there won't be bb blocking it.
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post #9 of 20 Old 05-18-2017, 05:17 PM
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Re: Kohler Command 25 (CV730s) Ball bearing in Carb?

Quote:
Originally Posted by Been There View Post
Just as I thought in my first posting, a ball plug has come loose, and there is a "Ball Plug" that sealed a passage, and it has fallen out. That would be #15 Photo, and the ball in the blue square. Just get you some JB Weld and put the ball back it hole.
That side is to the manifold with a gasket, it wouldn't be able to fall into the air filter.
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post #10 of 20 Old 05-18-2017, 09:25 PM
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Re: Kohler Command 25 (CV730s) Ball bearing in Carb?

look at the crank case relieve valve the one the rubber hose comes from

john
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post #11 of 20 Old 05-19-2017, 10:29 AM Thread Starter
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Re: Kohler Command 25 (CV730s) Ball bearing in Carb?

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Originally Posted by Father Deerest View Post
That side is to the manifold with a gasket, it wouldn't be able to fall into the air filter.
You're right.

Quote:
Originally Posted by no2498 View Post
look at the crank case relieve valve the one the rubber hose comes from

john
Yeah, there are only 2 possibilities. The CCV hose or an orifice shown in the picture to the left of the air cleaner cover stud.



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JD 46" snow Blade

Stihl 031AV (WIMA cap, base gasket delete) 20"
Echo CS-590 (MM) 20"
Husqvarna 128LD Trimmer
Giant Vac w/ 6.5HP Predator Engine
Unknown 1980's Japanese backpack Blower with Kawasaki engine
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post #12 of 20 Old 05-19-2017, 11:54 AM
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Re: Kohler Command 25 (CV730s) Ball bearing in Carb?

Most Lawn Tractor owners know how to find and make repairs to their equipment. There are some that should not be allowed to use a screw driver or a wrench. So, lets get some facts straight right up front here.
You wrote that you removed the air cleaner assembly from the Kohler Command 25 HP engine and a ball bearing fell out. NOTE: Was the ball bearing on the "outside" of the filter element? Outside of the foam part covering the filter itself. If it was on the outer side of the filter, it (ball bearing) didn't come from the carburetor. If it was on the inner side, it must come from the carburetor. And from there it has very little room (throat size here would be less than three inches at best.) The only way a ball bearing or any....object(s), whether it be a nut, screw or any debris to get into the air cleaner has to come from any opening. And that object would never get past the air filter it is in standard working assembly. Anything on the inner side of the air cleaner would end up in the engine due to the engine performance.

Anything from the fuel pump assembly would not end up in the air cleaner...inside the carburetor fuel bowl...NO. No ball bearing would get past the small orifices in the carburetor system. So discount that as a source for a ball bearing.

Have you had this tractor serviced by another person?


I relate a story that happen in 1967. I bought a new Pontiac LaMans. Every time I would make a left turn, a banging sound would happen at the rear right side of the car. It was annoying to say the least. One day...couple months later I decide to find the source of the banging sound. After removing the panel inside the trunk, there was the culprit. Some factory worker decided to play a prank. He tied a one inch bolt nut to a string that when the car would turn to the left, the nut would slam up against the inside fender.




file:///C:/Users/FRED/AppData/Local/Microsoft/Windows/INetCache/IE/28SFIFP1/Kohler-Service-Repair-Manual-Command-CV17-CV18-CV20-CV22-CV25-CV22-CV23-CV26.pdf
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post #13 of 20 Old 05-19-2017, 12:05 PM Thread Starter
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Re: Kohler Command 25 (CV730s) Ball bearing in Carb?

Quote:
Originally Posted by Been There View Post
Most Lawn Tractor owners know how to find and make repairs to their equipment. There are some that should not be allowed to use a screw driver or a wrench. So, lets get some facts straight right up front here.
You wrote that you removed the air cleaner assembly from the Kohler Command 25 HP engine and a ball bearing fell out. NOTE: Was the ball bearing on the "outside" of the filter element? Outside of the foam part covering the filter itself. If it was on the outer side of the filter, it (ball bearing) didn't come from the carburetor. If it was on the inner side, it must come from the carburetor. And from there it has very little room (throat size here would be less than three inches at best.) The only way a ball bearing or any....object(s), whether it be a nut, screw or any debris to get into the air cleaner has to come from any opening. And that object would never get past the air filter it is in standard working assembly. Anything on the inner side of the air cleaner would end up in the engine due to the engine performance.

Anything from the fuel pump assembly would not end up in the air cleaner...inside the carburetor fuel bowl...NO. No ball bearing would get past the small orifices in the carburetor system. So discount that as a source for a ball bearing.

Have you had this tractor serviced by another person?


I relate a story that happen in 1967. I bought a new Pontiac LaMans. Every time I would make a left turn, a banging sound would happen at the rear right side of the car. It was annoying to say the least. One day...couple months later I decide to find the source of the banging sound. After removing the panel inside the trunk, there was the culprit. Some factory worker decided to play a prank. He tied a one inch bolt nut to a string that when the car would turn to the left, the nut would slam up against the inside fender.




file:///C:/Users/FRED/AppData/Local/Microsoft/Windows/INetCache/IE/28SFIFP1/Kohler-Service-Repair-Manual-Command-CV17-CV18-CV20-CV22-CV25-CV22-CV23-CV26.pdf

LOL, thanks for life lessons and how not to be condescending. Perhaps you should reserve judgement on someone's mechanical skill until you meet them in person. Have you looked in a mirror lately? Well the FACT is that the bearing can fit in that orifice/tube or is part of the valve cover breather canister i listed. I perform my own repairs and maintenance.

John Deere G100, 54", Kohler Command 25
JD 46" snow Blade

Stihl 031AV (WIMA cap, base gasket delete) 20"
Echo CS-590 (MM) 20"
Husqvarna 128LD Trimmer
Giant Vac w/ 6.5HP Predator Engine
Unknown 1980's Japanese backpack Blower with Kawasaki engine
1968 M35A2
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post #14 of 20 Old 05-19-2017, 12:18 PM Thread Starter
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Re: Kohler Command 25 (CV730s) Ball bearing in Carb?

Well after further digging I find there is a check ball that is part of the Spit Back Cup system, and sits in that metal tube to the left of the air cleaner cover stud.

Fuel Spit Back System (Kohler CV730-0029) - DoItYourself.com Community Forums

John Deere G100, 54", Kohler Command 25
JD 46" snow Blade

Stihl 031AV (WIMA cap, base gasket delete) 20"
Echo CS-590 (MM) 20"
Husqvarna 128LD Trimmer
Giant Vac w/ 6.5HP Predator Engine
Unknown 1980's Japanese backpack Blower with Kawasaki engine
1968 M35A2
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post #15 of 20 Old 05-19-2017, 12:39 PM
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Re: Kohler Command 25 (CV730s) Ball bearing in Carb?

I'm sorry that I offended you, that wasn't my purpose. I wanted to ask where the ball bearing was found when you first notice it being in the air cleaner. Most people that have mechanical abilities know where and what ends up when machinery loses parts. I've worked on carburetors since 1947, and dissembled and rebuilt probably one thousand or more, and I never found where a ball bearing or any size object made it through small orifice or opening in a carburetor.
Carburetors today on lawn tractors don't have large passages like some made in the early 1920-1980 years.
Your JD G100 with the Kohler Command 25 has either a Nikki or Keikin carburetor and very few moving parts and there's not one orifice where a 1/4" size ball bearing would pass.

I would say the ball bearing didn't come from the workings ...outside or inside of the carburetor. nor the fuel system.

BTW. Most carburetors manufacturers use "welch plugs' now days to seal any orifices or passages that is not needed.

Last edited by Been There; 05-19-2017 at 12:46 PM.
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