Re: D4 CAT PONY MOTOR STARTING INSTRUCTIONS

Posted by Billy NY on May 20, 2006 at 12:27:43 from (64.12.117.6):

In Reply to: Re: D4 CAT PONY MOTOR STARTING INSTRUCTIONS posted by Horaceturlock on May 20, 2006 at 11:46:39:

I'm not familiar with that horizontal opposed starting engine, however the principles of operation are likely to be similar.

It probably has a Zenith carburetor on it,
check out: http://www.zenithfuelsystems.com
They usually need a good cleaning, there are a few things to know about them, and I will reiterate the gas leaking down into the crankcase oil, thinning it, I'm not sure what the cause of this is, somehow fuel ends up draining down, so it's best to shut the petcock off, and drain the bowl after the diesel fires, some people allow the engine to run out, which seems to take too long on mine. There has to be a reason the carb allows this to happen, more prevalent on the D4's type starting engine, one of my D7's overflowed the crankcase with gasoline once, and the fact that these are not high tech, splash lubed high revving motors, costly to rebuild, very wise to take care of them, they are great when properly maintained.

You may want to see if the governor is working properly, you do not want to overspeed one of these on its own or allowing the diesel to overspeed it when it fires, I hold the throttle linkage and as soon as the diesel just starts to fire, I throttle the pony down, let the diesel's centrifugal force kick out the pinion and then kill the pony, drain the bowl out with a petcock and short hose, ( gasoline, so I'm careful although it may not be the safest method, it's contained in a coffee can, and I have a welders glove on )

Fuel systems, and ignition systems on these must be properly maintained for good performance ans are usually the culprit when they act up.

You can engage the pinion prior to starting the pony,use the pony clutch to disengage power to the pinion after it is running, when you are ready to turn the diesel, engage the clutch, I've done this when mine was hard to get engaged. There are adjustments that can be made, the pony clutch may not be working properly, making it hard to get engage, if the pony is at a high r.p.m. it may be difficult as well, another item to consider is the adjustment for the diesel's centrifugal force( disengagement speed ) kicks out the latches that hold the pinion, you need to record the serial number of your 7U series tractor and get the serviceman's reference book, the parts catalog, and the operators instructions, all of which may be found as used original prints on E-bay:

http://business.listings.ebay.com/Heavy-Equipment-Parts-Manuals_Repair-Operations-Manuals_W0QQfromZR4QQsacategoryZ48713QQsocmdZListingItemList

or new reprints from Cat's Legendary literature program, ask for the phone number on the ACMOC or ACME websites, these are antique caterpillare machinery owner and the latter is enthusiasts websites, an excellent resource for old Caterpillar owners. The discussion forums are an excellent place to ask technical questions.

ALso remember if you run the starting engine and are not turning the diesel over, you may not be circulating coolant through the pony, it will overheat and could cause serious damage, not sure if the D4 7U's are like that but my D7 is, don't take long for it to get hot without coolant circulating.

Keep your oil clean and up to the full mark, diagnose any problems and do the necessary work to correct any problems, if it has good compression and not a lot of end play in the flywheel/crank shaft odds are it's in good condition, properly maitained, should perform well for years. If you notice any problems with compression or excessive endplay on the flywheel, better to correct the problem before a catastrophic failure, you'll be in for a rebuild or converting to direc electric start which may be a little expensive. I may be off on this, as I'm not familiar with this model, others may have better specifics on this particular tractor.

ACME:

http://www.antiquecaterpillar.net/ACF_v2/index.php?

• ACMOC

Replies:

• Re: D4 CAT PONY MOTOR STARTING INSTRUCTIONS Horaceturlock 15:07:12 05/20/06 (0)

Add a Reply Name: E-Mail: Subject: Comments: Optional Link URL: Link Title: Optional Image URL: Email Notification: If you check this box, email will be sent to you whenever someone replies to this message. Your email address must be entered above to receive notification. This notification will be cancelled automatically after 2 weeks.

TRACTOR PARTS	TRACTOR MANUALS

We sell tractor parts!  We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]