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D2 Just Died -- Help Please

D2 Just Died -- Help Please

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Muchbroker
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1st time poster and Cat newbie.

I live in Wyoming and had my 1947 Cat D2 5J813 Dozer up in the cold winter mountains. I checked all the oil levels and pulled and got the gasoline pony motor to start up fairly quick. I let it run for a bit and then engaged the Pinion Clutch lever and then lifted the Pinion Shift lever. I let the Diesel engine turn over for ~5 minutes then engaged the compression lever. I let it turn over like this for about another 3 minutes then I pulled the diesel throttle back aboput 1/4 of the way (1/4 throttle).
I just sat back and let it crank for a couple more minbutes. Then I heard a wierd noise in the pony motor and stopped dead.
I opened the compression lever again and dropped out the Pinion Clutch, but when I pull the pony motor it is harder than crap.
The fan on the diesel is NOT turning when I pull the pony motor thru.

Does this mean that the pinion is still engaged or do you all suspect I spum a pony motor crank bearing?

Thank you for any guidance you can provide, it is genuinely appreciated.
Muchbroker
Casper WY
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Wed, Feb 22, 2012 10:16 AM
zootownjeepguy
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Hi,
First of all, your 5J813 is more like a 1938 model. Does the pony motor have any oil in it? That's the first thing to check before trying to start anything. With all that cranking you could have spun a bearing if it's low on oil. There should also be oil in the pinion housing and in the bell housing under the pony motor (near the pinion engage lever). If the oil level is low or empty in any of these 3 places, damage may have been done. Sometimes you can get lucky and things will loosen up after it cools down. Even with the pinion and pinion clutch engaged to crank the main engine, the pony should turn fairly easy by hand.
Rich Salvaggio
D2 5U9917
'46 Willys CJ2A Farm Jeep, '39 Buick sedan, '49 International KB-7, '37 Allis Chalmers WC, Cushman Scooter(s)
Antique garden tractors & outboard motors
Other rusty old junk comes & goes without warning.

The 2 most useful tools to have in your shop are a Crystal Ball and a Magic Wand
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Wed, Feb 22, 2012 10:35 AM
Old Magnet
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Reply to zootownjeepguy:
Hi,
First of all, your 5J813 is more like a 1938 model. Does the pony motor have any oil in it? That's the first thing to check before trying to start anything. With all that cranking you could have spun a bearing if it's low on oil. There should also be oil in the pinion housing and in the bell housing under the pony motor (near the pinion engage lever). If the oil level is low or empty in any of these 3 places, damage may have been done. Sometimes you can get lucky and things will loosen up after it cools down. Even with the pinion and pinion clutch engaged to crank the main engine, the pony should turn fairly easy by hand.
Sounds like a clutch failure problem. Clutch drags but it is not fully engaging or disengaging. The pinion would still be engaged providing plenty of drag.
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Wed, Feb 22, 2012 10:57 AM
Muchbroker
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Reply to zootownjeepguy:
Hi,
First of all, your 5J813 is more like a 1938 model. Does the pony motor have any oil in it? That's the first thing to check before trying to start anything. With all that cranking you could have spun a bearing if it's low on oil. There should also be oil in the pinion housing and in the bell housing under the pony motor (near the pinion engage lever). If the oil level is low or empty in any of these 3 places, damage may have been done. Sometimes you can get lucky and things will loosen up after it cools down. Even with the pinion and pinion clutch engaged to crank the main engine, the pony should turn fairly easy by hand.
Thank you ZTJG, appreciate the response and the questions.

I know the pony crank case had oil in it even after it died. I havent checked the pinion and bell housing but will at the next chance.

If I spun a pony crank main bearing do you think the pony motor would still pull thru? I would have thought it would sieze. That is what made me think about the pinion still engaged.

I dont have a manual on this dozer, can you give a recomendation on where to get a good one?

Thanks for the date correction, I was just going by what the PO told me.

Again, appreciate the advice and some direction on this.
Muchbroker
Casper WY
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Wed, Feb 22, 2012 10:58 AM
Muchbroker
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Reply to Old Magnet:
Sounds like a clutch failure problem. Clutch drags but it is not fully engaging or disengaging. The pinion would still be engaged providing plenty of drag.


Thank you Old Magnet, that is the direction I was thinking also. My only concern is if that is the problem wouldnt the fan on the Diesel engine turn when I pull the pony motor thru now?

Thanks you for the input.
Muchbroker
Casper Wy
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Wed, Feb 22, 2012 11:04 AM
Old Magnet
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Reply to Muchbroker:


Thank you Old Magnet, that is the direction I was thinking also. My only concern is if that is the problem wouldnt the fan on the Diesel engine turn when I pull the pony motor thru now?

Thanks you for the input.
Muchbroker
Casper Wy
I think your somewhere in between, not enough clutch grip to turn the main but enough to feel the drag when rolling over the flywheel by hand.
Try manually disengaging the pinion by bumping the latch dogs. Should have a small 2" dia cover plate under the left floor board for access. Then try rolling over the pony flywheel......should spin freely then.

Do a search on here under the topic. These pony motor/clutch/pinion problems are the most discussed topic on here.
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Wed, Feb 22, 2012 11:23 AM
John from Fresno
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Reply to Old Magnet:
I think your somewhere in between, not enough clutch grip to turn the main but enough to feel the drag when rolling over the flywheel by hand.
Try manually disengaging the pinion by bumping the latch dogs. Should have a small 2" dia cover plate under the left floor board for access. Then try rolling over the pony flywheel......should spin freely then.

Do a search on here under the topic. These pony motor/clutch/pinion problems are the most discussed topic on here.
Make sure there is oil in the pony clutch. It will make a strange squealing noise right before it stops. That is, so i am told. :eek2:

John
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Wed, Feb 22, 2012 11:42 AM
drujinin
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Reply to John from Fresno:
Make sure there is oil in the pony clutch. It will make a strange squealing noise right before it stops. That is, so i am told. :eek2:

John
Try Ebay for manuals, I was perusing through there last night and saw lots of manuals listed for the D2
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Wed, Feb 22, 2012 7:08 PM
willitrun
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Reply to drujinin:
Try Ebay for manuals, I was perusing through there last night and saw lots of manuals listed for the D2
i watched a neighbor start a pony on a 7m after a overhaul.👋 ran about 5 minutes and bound up. turns out he had not got oil holes lined in back main, didn't hurt the crankshaft
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Wed, Feb 22, 2012 8:51 PM
Muchbroker
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Reply to willitrun:
i watched a neighbor start a pony on a 7m after a overhaul.👋 ran about 5 minutes and bound up. turns out he had not got oil holes lined in back main, didn't hurt the crankshaft
Thank you all -- I wil definetly check the clutch oil level, then try and dislodge the pinion. I really hope that is it.

Also thanks for the Ebay tip on manuals, I really got burned out on Ebay a few years ago due to the exorbanant (sp) costs of "shipping and handling" but I need the manuals so will just have to pay the piper.

Thanks again to all of you, I will be sure and post the outcome.
Muchbroker
Casper WY
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Wed, Feb 22, 2012 9:40 PM
zootownjeepguy
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Reply to Muchbroker:
Thank you all -- I wil definetly check the clutch oil level, then try and dislodge the pinion. I really hope that is it.

Also thanks for the Ebay tip on manuals, I really got burned out on Ebay a few years ago due to the exorbanant (sp) costs of "shipping and handling" but I need the manuals so will just have to pay the piper.

Thanks again to all of you, I will be sure and post the outcome.
Muchbroker
Casper WY
[quote="Muchbroker"]Thank you all -- I wil definetly check the clutch oil level, then try and dislodge the pinion. I really hope that is it.

Also thanks for the Ebay tip on manuals, I really got burned out on Ebay a few years ago due to the exorbanant (sp) costs of "shipping and handling" but I need the manuals so will just have to pay the piper.

Thanks again to all of you, I will be sure and post the outcome.
Muchbroker
Casper WY[/quote]

Shop around on Ebay for the manuals. Some of them are priced quite high and those same ones have been on for over a year. They come up regularly, if you search "caterpillar d2" every few days you'll eventually find one at a decent price, and, yeah watch out for the "shipping Mafia".

The pinion is geared to the pony motor and they always move together. If your pony turns hard, does the flywheel rock back & forth easily for about 1/8" or so? That would indicate a problem with the pinion, allowing the pony to turn slightly and 1/8" or so is about how much backlash is in the gears that transmit power to the pinion. If there is no backlash to be felt it's most likely the pony motor itself. Another possibility is that the pony just overheated. The J series D2's have a small coolant passage between the Diesel Head and Pony Manifold. The lower coolant passage is out of the diesel water jacket (near the pony oil drain tube) through the bell housing and up into the bottom of the pony block. If crud builds up and blocks these passages the pony could overheat and seize, or score a cylinder or bearing.
Rich Salvaggio
D2 5U9917
'46 Willys CJ2A Farm Jeep, '39 Buick sedan, '49 International KB-7, '37 Allis Chalmers WC, Cushman Scooter(s)
Antique garden tractors & outboard motors
Other rusty old junk comes & goes without warning.

The 2 most useful tools to have in your shop are a Crystal Ball and a Magic Wand
Please log in or create an account to join the conversation.
Thu, Feb 23, 2012 5:25 AM
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