D4D STATUS.

rehpig

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Going to look at a stuck D4D 78AXXXX. Head is off. All cylinders are on the bottom of the stroke. No signs of water in oil pan. Major crank failure???? Availability of parts ok? Said to have good undercarriage. Any advice would be greatly appreciated. This winter project. What engine would be in this machine? Does roll.

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Mon, Aug 24, 2020 8:10 PM

JackD6-5R

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I have had an early D4D 78AXXX for about 10 or12 years. Not sure about parts avalability , I haven't needed anything but filters. I don't use it very much, easy tractor to run, would buy it again. Allmost forgot ,broken rods or crank pistons should not all be at bottom.

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Mon, Aug 24, 2020 9:21 PM

Old Magnet

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Reply to JackD6-5R:

I have had an early D4D 78AXXX for about 10 or12 years. Not sure about parts avalability , I haven't needed anything but filters. I don't use it very much, easy tractor to run, would buy it again. Allmost forgot ,broken rods or crank pistons should not all be at bottom.

Evolution of the 78A.....
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Mon, Aug 24, 2020 10:38 PM

rehpig

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Evolution of the 78A.....

Looked it over. Looks like a new set of tracks and chain would be in order. Does appear to have the forward and reverse lever on far right of cab. That does not seem to move. (Don’t know about this so maybe it has to be running. Right brake froze. Steering clutches do actuate and all linkages move. Left brake moves but doesn’t spring back. Transmission group number is 4k503. Serial number is 78a5673. Transmission does shift as it should in the center and right quadrant. Far left quadrant [attachment=60280]6FB087C6-573E-45D5-AE73-4B973E69693C.jpg[/attachment][attachment=60280]6FB087C6-573E-45D5-AE73-4B973E69693C.jpg[/attachment][attachment=60281]E39720C3-5B2E-4AC1-A86D-78CBA358B331.jpg[/attachment][attachment=60282]610D6F25-FEDE-4688-99F7-26129A9C2D98.jpg[/attachment]I could not get it to go into gear without pushing harder...which I did not do. Head is off. Cylinder 4 seams to have metal on sleeve... I could not scrape it off with my finger nail. Other three sleeves seem reasonable and have pb blaster sitting in them. Here is a pic of the head[attachment=60276]7972AA2E-AE33-40DF-9F69-9FB43EE059BF.jpg[/attachment][attachment=60277]5932AA6C-4B26-44C8-8B71-BB60A9074903.jpg[/attachment][attachment=60278]CB5E951B-B3D9-44BE-9CF2-24606094A648.jpg[/attachment][attachment=60279]D6A6E892-5036-49E7-9CD6-B5751FC2FE9A.jpg[/attachment]

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Wed, Aug 26, 2020 7:56 PM

Old Magnet

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Reply to rehpig:

Looked it over. Looks like a new set of tracks and chain would be in order. Does appear to have the forward and reverse lever on far right of cab. That does not seem to move. (Don’t know about this so maybe it has to be running. Right brake froze. Steering clutches do actuate and all linkages move. Left brake moves but doesn’t spring back. Transmission group number is 4k503. Serial number is 78a5673. Transmission does shift as it should in the center and right quadrant. Far left quadrant [attachment=60280]6FB087C6-573E-45D5-AE73-4B973E69693C.jpg[/attachment][attachment=60280]6FB087C6-573E-45D5-AE73-4B973E69693C.jpg[/attachment][attachment=60281]E39720C3-5B2E-4AC1-A86D-78CBA358B331.jpg[/attachment][attachment=60282]610D6F25-FEDE-4688-99F7-26129A9C2D98.jpg[/attachment]I could not get it to go into gear without pushing harder...which I did not do. Head is off. Cylinder 4 seams to have metal on sleeve... I could not scrape it off with my finger nail. Other three sleeves seem reasonable and have pb blaster sitting in them. Here is a pic of the head[attachment=60276]7972AA2E-AE33-40DF-9F69-9FB43EE059BF.jpg[/attachment][attachment=60277]5932AA6C-4B26-44C8-8B71-BB60A9074903.jpg[/attachment][attachment=60278]CB5E951B-B3D9-44BE-9CF2-24606094A648.jpg[/attachment][attachment=60279]D6A6E892-5036-49E7-9CD6-B5751FC2FE9A.jpg[/attachment]

What does the rest of the machine look like? Engine is a D330A - 4-1/2" bore. Why was it torn down?
If machine appears beat up check for cracks in the main frame to steering clutch case mounting, otherwise doesn't seem too far gone. If it needs undercarriage scrap price less transport cost would be in order.

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Wed, Aug 26, 2020 10:42 PM

rehpig

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What does the rest of the machine look like? Engine is a D330A - 4-1/2" bore. Why was it torn down?
If machine appears beat up check for cracks in the main frame to steering clutch case mounting, otherwise doesn't seem too far gone. If it needs undercarriage scrap price less transport cost would be in order.

Machine not too bad looking. Motor was stuck. Head removed. Other than tracks most of tractor has good original paint. Will check if cracks exist. Offered $750

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Wed, Aug 26, 2020 11:49 PM

SteveBudke

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Reply to rehpig:

Machine not too bad looking. Motor was stuck. Head removed. Other than tracks most of tractor has good original paint. Will check if cracks exist. Offered $750

I have a D330A industrial engine, complete, running take-out best I remember. Just barred it over freely.
s/n 56B1838. Set up for marine generator Cylinder block casting #7M4300. Located near Cincinnati Ohio
Priced VERY affordable. Steve 513 325-6934 or [email protected]

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Thu, Aug 27, 2020 1:50 AM

rehpig

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Reply to SteveBudke:

I have a D330A industrial engine, complete, running take-out best I remember. Just barred it over freely.
s/n 56B1838. Set up for marine generator Cylinder block casting #7M4300. Located near Cincinnati Ohio
Priced VERY affordable. Steve 513 325-6934 or [email protected]

Is it “NORMAL” to get your engine before the dozer? Here it is cleaned up and sitting in my semi cleaned shop. Thank you Steve Budke! I am picking up the dozer Tuesday morning!
Lots of questions still left to be answered. When the D4D arrives I’ll drop the pan and see what I have to work with. If the pistons are just stuck is there a problem with just removing the sleeve/piston/rod assembly? It’s surely still possible that an inframe would be my best route.
Then there is the new engine...marine generator engine. Hours meter showed 17844[attachment=60316]FD63D3B3-5164-4363-AECC-D31C44FEA71A.jpg[/attachment]
Is this 1784.4 or 17844. Don’t know the maintenance history on it. Since it is out and sitting in my shop. Should I partially disassemble it and verify wear on mains/rods. Should I remove the head and have the valves done and resurfaced? This engine has a turbo. Should I consider using it on the dozer? Will it fit?
Like I said LOTS of unanswered questions. [attachment=60317]C7AB80B7-5D4F-4AA0-B0C7-10CB1D505109.jpg[/attachment][attachment=60318]DD4B1B94-5B37-4D65-982D-FF9B00495259.jpg[/attachment][attachment=60318]DD4B1B94-5B37-4D65-982D-FF9B00495259.jpg[/attachment]. [attachment=60319]37636684-B2F3-491E-ABA0-3855323D1501.jpg[/attachment] it’s going to be a fun project!!

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Sun, Aug 30, 2020 8:07 PM

gauntjoh

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Are you sure all pistons are on the bottom of the stroke? It looks to me that two maybe going down and two coming up and they are at the crossover point.

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Sun, Aug 30, 2020 8:46 PM

rehpig

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Reply to gauntjoh:

Are you sure all pistons are on the bottom of the stroke? It looks to me that two maybe going down and two coming up and they are at the crossover point.

That I need to verify but that’s what I’m now thinking

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Sun, Aug 30, 2020 8:53 PM

Deas Plant.

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Reply to rehpig:

That I need to verify but that’s what I’m now thinking

Hi, rehpig.
I'm with Gauntjoh on this one. Those pistons are around crossover with the 2 middle ones being higher in their bores than the end ones.

If #4 has metal on the sleeve, that would seem to indicate that it has 'grabbed' at some stage

The whole D4D range was one of the most bulletproof models that Cat made up to that time - and not many or much better since.

Some of the early D4Ds fitted as dozers did have frame cracking problems as they were the first D4s set up standard with the blade lift mounted on the nose like their bigger brothers.

I never did see a D4D as a bare tractor around where I lived and worked. Everybody seemed to want them to be miniature D9s.

Just my 0.02.

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Sun, Aug 30, 2020 11:21 PM

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