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Pony Motor on old CATS

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Gary OC 46

01-28-2001 08:26:28




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Having never gotten close to any CATS I don't understand the pony motor thing? Does the pony motor turn the big motor over or does it heat coolant and warm the block so the big motor starts.I guess the pony is a small gas engine. Why do some people say they are alot of trouble? Thanks for sharing this info. Maybe I'll have to buy a real machine someday.




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Pat

06-11-2003 19:07:42




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 Re: Pony Motor on old CATS in reply to Gary OC 46, 01-28-2001 08:26:28  
we have a bunch of dozers down here, all of em old Cats and IH's. The D8 13A and the D6 9U we have both have pony's on em. The pony's exhaust warms up the big motor and at the same time you engage a clutch, engage the pinion, disengage the clutch, and the pinion has a gear on the end of it which is in mesh with the flywheel on the big motor, so it cranks the diesel. plus there is a compression release handle which opens and closes the valves which makes it easier to crank the big diesel.

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greg

03-14-2001 16:55:23




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 Re: Pony Motor on old CATS in reply to Gary OC 46, 01-28-2001 08:26:28  
Worked for a contractor that had 6 pony machines. General operating practice was , in fact , to shut off gas to killpony motor. Threw hundreds of dollars at pony carbs to straighten them out, but leaving machines set dormant for 6months during off season usually undid all your efforts at repair.



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Toby

02-24-2001 18:49:48




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 Re: Pony Motor on old CATS in reply to Gary OC 46, 01-28-2001 08:26:28  
I've overhauled a couple of old Cat D2 pony motors and have found a couple of weak points in them myself. The worst I've seen can be caused by the carburetor. The seat on the inlet needle becomes worn and lets gas leak into the crakcase, thinning the oil. I've found it best to forget about the on/off switch and just turn the gas off at the tank as a means of stopping the engine. The other is the primitive splash lubrication system. To work properly, the pony motor should be allowed to warm itself thoroughly before put to work. This ensures the oil has had time to find its way to all of the critical lubrication points of the motor before they are put under any stress, thus prolonging the life of the engine itself.

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Len

01-30-2001 13:50:07




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 Re: Pony Motor on old CATS in reply to Gary OC 46, 01-28-2001 08:26:28  
Gary OC 46,
The pony engine is a 10 HP gas which originally was started with a pull rope. Latter electric starter motors were installed on some pony engines. The pony engine warmed up the diesel engine with it's exhaust gases, or in some cases it's cooling water. Also allowed diesel engine oil pressure to build up before ingition. With a little maintenance on your pony you can start your big engine anywhere and in any temperature. You can let the pony warm up the iron in -0 weather as long as needed to get the diesel to fire. Gary, most people have trouble with everything they don't pay attention to--even their families!!

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bill

01-28-2001 14:13:16




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 Re: Pony Motor on old CATS in reply to Gary OC 46, 01-28-2001 08:26:28  
The pony motor is used to start the machine. You get the engine running, engage a clutch it starts the motor and off you go. The electric starters were not that strong in those days. It had more to do with battery technology and cranking amps.

To start high compression large diesel engines many manufacturers use pony motors. IH on the otherhand opted for a start on gas, get it warmed up and running and then cut over to diesel.

With either technolgy there were problems. For Cats, the pony motor was an achillies heel. For IH the head design to do the gas over deisel became that engines achillies heel.

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