I am looking pretty hard at a CAT D6C with the 3306T engine. Serial number is 10k13318. I was wondering if there is anything specific (known problems with this model) I should look for. I am hoping someone out there has the measurements for the undercarriage. It is a 2 owner dozer and was farmer owned its entire life. It has 4,000 hours on it. Everything looks pretty good with it, I just like to have more opinions when making a purachse like this. I will post up some pictures and give me your honest feedback!
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Cat d6c 3306t
- Thread starter d5cat
- Start date
Mjrdude1
Well-Known Member
The old D6C is pretty bulletproof, the biggest issue you might face is parts availability. Cat used to make parts forever, but have started with phazing out some of the older parts that don't have a good volume of sales.
Pull some oil samples of the drivetrain, engine, trans, finals etc. See what kind of wear metal levels there are, will give you a good indication of something on it's way to failing. Well worth the money before you buy.
Feel the bushings on the tracks for wear, maybe run the machine around a while and feel each bushing looking for hotter than the others, will indicate a dry joint.
Pull some oil samples of the drivetrain, engine, trans, finals etc. See what kind of wear metal levels there are, will give you a good indication of something on it's way to failing. Well worth the money before you buy.
Feel the bushings on the tracks for wear, maybe run the machine around a while and feel each bushing looking for hotter than the others, will indicate a dry joint.
It would be nice to have the mud off the frames but from what I the UC looks pretty good. UC and fuel are your biggest expence.
That model of tractor is very good, tough, big enough to do a lot of work yet small enough to move easily. Pry the sprockets, side to side and look for play(hub bearings).
Later Bob
That model of tractor is very good, tough, big enough to do a lot of work yet small enough to move easily. Pry the sprockets, side to side and look for play(hub bearings).
Later Bob
I was worried about parts too, but I called CAT and they said they still have parts for it. Who knows what the future holds though. Time for a dumb question, where are the bushings at on the tracks? I know people talk about the pins/bushings but I didn't know what they were referring too.
Thanks for the tip!
Huntoon
Senior Member
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- Sales Engineer. I design OEM tracked undercarriage
pitch of track links is 8 inches I believe.
Looks like the head has been off as it's not painted. Might have a bottom roller leaking and looks like some rollers have been replaced (newer paint).
You sure about the hours?
Overall it looks to be in pretty good shape and that's a late serial no for a 6c.
You sure about the hours?
Overall it looks to be in pretty good shape and that's a late serial no for a 6c.
Scrub Puller
Senior Member
Yair . . .
d5cat The only dumb question is the one you don't ask.
The bush is the component that fits into the teeth of the sprocket and is subject to external wear.
The pin is the component on which the bush pivots and in this day and age runs in oil hence the acronym SALT tracks i.e. Sealed And Lubricated Track.
That's a tidy looking tractor and you have some knowlegable replies . . . you need to keep an eye on those top carrier rollers if you are working in that sort of clay.
They need shoveling out or running through a puddle of water to keep them turning. It doesn't take long to wear a flat spot.
Cheers.
d5cat The only dumb question is the one you don't ask.
The bush is the component that fits into the teeth of the sprocket and is subject to external wear.
The pin is the component on which the bush pivots and in this day and age runs in oil hence the acronym SALT tracks i.e. Sealed And Lubricated Track.
That's a tidy looking tractor and you have some knowlegable replies . . . you need to keep an eye on those top carrier rollers if you are working in that sort of clay.
They need shoveling out or running through a puddle of water to keep them turning. It doesn't take long to wear a flat spot.
Cheers.
Last edited:
2stickbill
Senior Member
Speaking of the head.Nearly every 3306 in a dozer has been replaced for some reason.I was working on a D6D about 3000HRS and the head and one piston had been replaced.I'm guessing maybe a dropped valve.My dad run a D6B that done this while in warranty.Still a good engine.
You have a good eye, the guy said some of the bottom rollers have been replaced recently. How big of a deal is the leaking roller? Are those supposed to be sealed or can it just be greased? I guess you can never be sure about the hours but if it was a farmer owned machine, it is believable. I had a 1973 D5 that only had 4000 hours when I bought it, and they had the maintenance records to prove it. This one doesn't have the maintenance records though so who really knows. This is going to be a farm dozer, so it is going to see some tree clearing, building terraces, and maybe a pond or two. I might put 100-200 hours on it a year.
Thanks for the reply. So why do people talk about the turning of the pins/bushings? How do you tell if they have been 'turned'?
d5cat,
I didn't want to sound like I was nit-picking the machine...It looks pretty nice to me. Much better than mine when I got it. (had to do the head gasket on mine too...along with 100 other things....it has been used pretty hard)
The bottom rollers are sealed full of oil...might run quite a while without problems. Most people just replace them when the bushings go out.
I didn't want to sound like I was nit-picking the machine...It looks pretty nice to me. Much better than mine when I got it. (had to do the head gasket on mine too...along with 100 other things....it has been used pretty hard)
The bottom rollers are sealed full of oil...might run quite a while without problems. Most people just replace them when the bushings go out.
grandpa
Senior Member
Feel, look, at the bushing, you will see wear where the bushing engages the sprocket,, then look 180 degrees from that wear point and see if the other side of the bushing has been worn. If it has then they have already been turned.
grandpa
Senior Member
Oh, by the way I've machine ser. no. 10k12511 which I bought new in 1976 for 47,000 bucks... gramps.
You are not nit-picking at all. I didn't notice the leaking roller and that is why I posted all the pictures so you guys would catch stuff like that. Is it hard to replace those? I am guessing you have to take off the track.
Normally you can loosen the track and block it so the track slacks at the bottom. That usually gives enough room to pull a roller out.....IF the bolts will come loose. Be careful...lots of heavy steel that likes to smash fingers.
Everyting on my 6c was very rusty and the rollers were poor so I took it to the track shop. They pulled the roller frames, flipped them over, and torched out the bolts. (Almost the worst one they'd ever seen) I put a good-used set of rollers on that should last as long as the rest of the undercarriage.
Everyting on my 6c was very rusty and the rollers were poor so I took it to the track shop. They pulled the roller frames, flipped them over, and torched out the bolts. (Almost the worst one they'd ever seen) I put a good-used set of rollers on that should last as long as the rest of the undercarriage.