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Caterpillar Pony Motor

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Greg

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Joined
Jan 28, 2008
Messages
1,175
Location
Wi
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Excavating Contractor
I got one setting in the shop which came of a D7E which needs head gasket, and ring gear if anyone is interested. Switched this machine to direct electric.
 
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Wheel Trencher

Member
Joined
Dec 19, 2008
Messages
6
Location
Houston,TX.
Occupation
Pipeline construction.
They don't have water pumps & I can't think of any use for one ??
I've got 3 are 4 laying in my yard if anybody wants 1!!!!
 
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Greg

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Wi
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Excavating Contractor
Dpete,
I have owned this machine since 1989 and have done a pile of work with blade and scraper both with it.
The pony worked great for a long time. I could not complain on it until it started bothering on the last job the machine was on with the pony motor. What about best thing for me? I am the guy who has to start it. Oh ya, it works great. The worst part of the conversion was making a bracket to mount a 24 volt alternator.
 
DPete

DPete

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Joined
Feb 21, 2007
Messages
1,677
Location
Central Ca.
Yeah, I did the same to a D8H and never looked back. As you said the starting engine works well but is far more complicated and alot more to go wrong than the 2 or 3 moving parts with the direct start. I sold that machine a few years ago and moved on to D8K's so it's been a awhile since I pulled on that bendix lever, did it for years though.
 
D

d7bush

New Member
Joined
Aug 15, 2012
Messages
3
Location
bc
Greg said:
I got one setting in the shop which came of a D7E which needs head gasket, and ring gear if anyone is interested. Switched this machine to direct electric.
Click to expand...

Greg, Do you still have your pony motor for the D7?
 
G

Greg

Senior Member
Joined
Jan 28, 2008
Messages
1,175
Location
Wi
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Excavating Contractor
Sorry d7bush. Long gone. Had fire in my old shop almost three years ago. It went when the mess got cleaned up. I had the idea I was going to rebuild it, not sure what for, so that is why it got kept for several years.

Cat used the same pony motor on D7, D8 and D9's so any one of them will work for you. Be careful of the series though because the later ones came with an oil filter and the support bracket on the front was different. Basic engine design was the same.
 
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hector gemme

Well-Known Member
Joined
Mar 5, 2008
Messages
133
Location
Ste-Julie
These poney are't all the same model some have different front cover, governor, magneto,water pipe,exhaust pipe,front bracket,carburator,crankshaft and more
 
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Birken Vogt

Charter Member
Joined
Nov 30, 2003
Messages
5,323
Location
Grass Valley, Ca
How do the Cats actually start on direct electric? I was under the impression that the pony also heated the jacket water and ran the exhaust into the Cat intake therefore performing a lot of preheating. Do you have to give it a healthy dose of ether when starting cold or is there some kind of electric heater that can be added?
 
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Birken Vogt

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Joined
Nov 30, 2003
Messages
5,323
Location
Grass Valley, Ca
Old Magnet said:
Direct electric start machines used different pre-combustion chambers that were predrilled to accept the glow plugs.
Click to expand...

I'm not sure if we are talking about exactly the same thing here. You might be talking about engines that were direct electric from the factory?

I was wondering how you got a machine that was originally a pony start to start with an electric starter. Surely in cold temperatures they needed a lot more help than just spinning the engine with the starter.
 
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