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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Starting a D4 with pony motor

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Paul Simmer

01-16-2007 12:39:45




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I have a coworker who purchased some acreage in Montana, and it came with an old D4 with a pony motor. It hasn't been started in app. 5 years. He is looking for basic starting instructions of the diesel once the pony is running. I have done it, but the last time was in 1985, and my memory isn't that good! Once the pony is running, can someone list the basic instructions for getting the diesel fired up? I think I could remember if I was next to it, but I won't be. Thanks.

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W R

01-19-2007 18:24:17




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 Re: Starting a D4 with pony motor in reply to Paul Simmer, 01-16-2007 12:39:45  
If the pinion lever needs to be held in by hand,hold it so it comes free of your hand when the diesel starts as it disengages with enough force to cause injury.



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Paul Simmer

01-17-2007 04:53:51




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 Re: Starting a D4 with pony motor in reply to Paul Simmer, 01-16-2007 12:39:45  
Thanks for very detailed instructions, I am sure they will help get this old girl running!



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Old Magnet

01-16-2007 18:13:22




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 Re: Starting a D4 with pony motor in reply to Paul Simmer, 01-16-2007 12:39:45  
Very good description Dave.
The only thing I would add is before starting open the cylinder petcocks and roll the pony over by hand a few turns to exhaust any liquids (gas/oil/water) then close the petcocks and start the procedure.



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Dandy Dave

01-17-2007 05:16:16




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 Re: Starting a D4 with pony motor in reply to Old Magnet, 01-16-2007 18:13:22  
Yes sir Old Magnet sir! Been there, done that, and still remember how even! I agree, Opening the petcocks is a good idea and I have had to do this on some old machines when the pony was flooded from a sticky float valve in the carb. I hate when that happens! Dave!



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Dandy Dave

01-16-2007 14:39:59




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 Re: Starting a D4 with pony motor in reply to Paul Simmer, 01-16-2007 12:39:45  
(Assuming this is an old 7U or there about.)Be sure the Diesel is decompressed or in the start position. This lever is toward the back of the block and has start and run positions. Turn the fuel on to the pony, Throttle in for full and Back for idle. Choke out for choke. Get the pony running, usually the hardest part! After the pony is running there are two levers on the side. the short one that is side ways is the pinion lever and the taller curved one is the clutch. Push the Clutch lever back toward the dash. This puts the brake on and stops the pinion from turning so the it can be put in without grinding. Then lift the pinion lever to engage the gear in to the flywheel. It may be necessary to jog the clutch lever to get it to engage. When it clicks in then slowly move the clutch lever toward the front of the tractor until it snaps in. Many times the pinion will have to be held as the dogs are worn and jump out. After the engine gets oil pressure move the decompressor to the run position. Then open the trottle lever. It will snap open when it is pushed/ pulled back. Sometime it my require a shot of ether. After the diesel starts shut the gas off to the pony or it will find its way into the cylinders and into the oil. Hope this Jogs your memmory. Dave!

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