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Cat955 Traxcavator electric starter/pony motor

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Doug C

12-27-2001 18:53:38




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Anybody know if I can put an electric starter on this machine (12A5738) instead of rebuilding the Pony motor? I see it has the triangular plate over the area where it looks like a starter fits.

What starter might interchange into this machine? From another Caterpiller? or from a truck?

Thanks




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Brokenwrench

12-28-2001 16:50:40




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 Re: Cat955 Traxcavator electric starter/pony motor in reply to Doug C, 12-27-2001 18:53:38  
A starter can be installed, it will take a 24V starter, a pair of 4-D batteries and a single wire 24V alternator in place of your generator. The drive on the starter will have to come from CAT because the teeth on the drive are on an angle to mesh with the ring gear. A good starter & alt. shop should be able to fix you up with the alt. & starter less the drive. You have to plug some coolant lines, and make a plate to cover the top of the bellhousing, and block off the pony exhaust port to the intake manifold. You will also have to use a snort of ether to get it started as you don't have the pony to warm it up, or you can change the nozzel holders to the later style with a glow plugs. If this all sounds like too much work, why don't you just fix up or replace the pony motor.

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DougC

12-30-2001 04:32:26




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 Re: Re: Cat955 Traxcavator electric starter/pony motor in reply to Brokenwrench, 12-28-2001 16:50:40  
Brokenwrench offered some good information. Thank you. I can fix up the pony motor but overhauls and parts are expensive and when it sits unused for 6+ months at a time, the pony seems hard to get running. The direct start seems to be the better long term approach if I can find a used starter and the work to put it on seems easy enough.
Questions back to Brokenwrench:
1) What are "4-D" batteries? Just high capacity 12 volt units?
2) Any idea what used starter will fit (interchange off some other CATs or tractors?) so I could buy it at a tractor salvage yard instead of a completely rebuilt one (expensive) from a starter shop?

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Jon D

01-07-2002 14:13:47




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 Re: Re: Re: Cat955 Traxcavator electric starter/pony motor in reply to DougC, 12-30-2001 04:32:26  
True fixing the pony motor will be expensive, but what makes you think an electric starter will be cheap. Those batteries Brockenwrench is talking about are $400 a piece. You'll find that they don't stay up in cold weather either when they get older. These older engines run at very low RPMs so they take a while to get started. Electric motors are only meant to go for a couple of secounds, not a couple of minutes, so you may find they are easy to burn up. I think you'll find if you fix that pony motor, you wont have to do much to it for as long as you have to worry about it.
P.S. Is that pony motor a hand start? I've seen people put belt driven starters/gernerators on them. That may even solve your without haveing to do anything to the motor. Good luck :)

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Brokenwrench

12-30-2001 10:44:16




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 Re: Re: Re: Cat955 Traxcavator electric starter/pony motor in reply to DougC, 12-30-2001 04:32:26  
the 4d batteries are very large (85#s ea) that you will need to crank the engine over at cold temps. you might luck into a starter at a salvage yard, but it has to be one off an engine that has been converted from pony to electric do to the drive design.



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gatractorman

12-28-2001 02:37:34




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 Re: Cat955 Traxcavator electric starter/pony motor in reply to Doug C, 12-27-2001 18:53:38  
Yes if it has the plate on the bellhousing you can put a starter on it, but as far as one to fit it i'm not sure.



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