New to the group but love all the information I read here. Just bought a CAT D6C, the engine is seized. I do not know the year but the the serial number is 76A3340. I can't seem to find anything as far as the #'s 3340. It is a turbocharged engine, fuel injection. From what ive read I believe the engine to be the 333. Im looking to buy a service manual but without knowing the year I'm concerned. Any information would be greatly appreciated.
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D6C with 76A
- Thread starter Fuze
- Start date
FWD
Senior Member
It is a 1965 model, however, everything about heavy equipment is serial number. You need to know serial number for manuals, parts and about everything else. Welcome to the forum, a lot of knowledge here! There is a serial number for the engine too. A lot of older Cats had engine number same as the machine.
FWD
FWD
OzDozer
Senior Member
Fuze - The prefix 76A tells us your tractor is a D6C with 74" track gauge, is fitted with a powershift transmission, and it was built in the U.S.
The 3340 number is the sequential build number (serial numbers started at 76A0001 for the 1st tractor off the assembly line), and S/N books tell us 76A3340 was built in 1965 (76A2107 to 76A3593 were built that year).
The engine is indeed known as the D333, it is primarily identified by its bore diameter, which is 4.5".
Your tractor and its engine share the same serial number. With later model Cats after about 1971, the engines got a separate serial number.
You buy the D6C Service Manual that has on the front cover, "For 74A and 76A models". 74A is the Direct Drive transmission version, and both types of transmissions are covered in the manual.
IPD can provide a good quality aftermarket engine overhaul kit for your engine.
When overhauling this engine, one of the primary areas where you need to exercise great care, is in cylinder head installation.
There are brass ferrules that are fitted with a rubber compression seal around a centre projecting flange of the ferrule, between cylinder head and block.
These ferrules contain coolant directors that must be oriented correctly upon installation. There is an arrow stamped in the top of the block to guide you, and the manual describes the ferrule orientation procedure.
In addition, when replacing the cylinder head onto the block, great care must be exercised when lowering the head, that the head is perfectly aligned and lowered evenly onto the ferrules, to avoid crushing them via misalignment - which can happen if the head is lowered too rapidly and unevenly.
Accordingly, a mechanical lowering method that can be carefully controlled, is a far better system to replace the cylinder head, as compared to simply lowering the head on by hand.
Having said this, I have replaced numbers of D333 cylinder heads by hand with success - but had at least one that I recall, that ended up with an accidentally-crushed ferrule - which caused a leak, which necessitated head removal again!
The 3340 number is the sequential build number (serial numbers started at 76A0001 for the 1st tractor off the assembly line), and S/N books tell us 76A3340 was built in 1965 (76A2107 to 76A3593 were built that year).
The engine is indeed known as the D333, it is primarily identified by its bore diameter, which is 4.5".
Your tractor and its engine share the same serial number. With later model Cats after about 1971, the engines got a separate serial number.
You buy the D6C Service Manual that has on the front cover, "For 74A and 76A models". 74A is the Direct Drive transmission version, and both types of transmissions are covered in the manual.
IPD can provide a good quality aftermarket engine overhaul kit for your engine.
When overhauling this engine, one of the primary areas where you need to exercise great care, is in cylinder head installation.
There are brass ferrules that are fitted with a rubber compression seal around a centre projecting flange of the ferrule, between cylinder head and block.
These ferrules contain coolant directors that must be oriented correctly upon installation. There is an arrow stamped in the top of the block to guide you, and the manual describes the ferrule orientation procedure.
In addition, when replacing the cylinder head onto the block, great care must be exercised when lowering the head, that the head is perfectly aligned and lowered evenly onto the ferrules, to avoid crushing them via misalignment - which can happen if the head is lowered too rapidly and unevenly.
Accordingly, a mechanical lowering method that can be carefully controlled, is a far better system to replace the cylinder head, as compared to simply lowering the head on by hand.
Having said this, I have replaced numbers of D333 cylinder heads by hand with success - but had at least one that I recall, that ended up with an accidentally-crushed ferrule - which caused a leak, which necessitated head removal again!
Nige
Senior Member
Continuing on from what @OzDozer posted IMHO you really need to get manuals for this tractor.
The online systems are pretty sketchy regarding parts & service information for a tractor the age of yours. If you can go looking by Part Number it makes it much easier for everyone.
A Parts Manual is Cat Publication reference UE035000. This is applicable to all 76A machines from first built up to 6061.
A Service Manual is out of print with Cat but you can get one HERE. I don't know how good their manuals are, maybe someone else can comment.
The online systems are pretty sketchy regarding parts & service information for a tractor the age of yours. If you can go looking by Part Number it makes it much easier for everyone.
A Parts Manual is Cat Publication reference UE035000. This is applicable to all 76A machines from first built up to 6061.
A Service Manual is out of print with Cat but you can get one HERE. I don't know how good their manuals are, maybe someone else can comment.
OzDozer
Senior Member
For years, Jensales manuals have regularly been described as poor quality reproductions, by purchasers.
I don't know if they've improved their reproduction quality in recent times.
I don't know if they've improved their reproduction quality in recent times.
Nige
Senior Member
What about this one.?
The only other thing I can suggest is to contact these guys. They do not list anything but it might be worth an ask.
The only other thing I can suggest is to contact these guys. They do not list anything but it might be worth an ask.
OzDozer
Senior Member
The Finney one appears to be quite a satisfactory reproduction, if their photos are anywhere near accurate.
tctractors
Senior Member
The engine fitted is the D333B, the B bit is the important detail as there is 3 types of 333 engine build, the last one the 333C has the thin head and 4 3/4" bore and nothing like the B series, they are a lovely engine and built to a high CAT tradition.
Welder Dave
Senior Member
I've got some stuff from Finney and they were good to deal with except the 2nd item went through FedEx and had extra charges the 1st item didn't have. Fedex was more the problem though. Through the post office is best, then UPS.
charles walton
Senior Member
Could a crushed ferrule cause coolant to leak into the oil? My 74a had been overhauled and had low hours when water in the oil caused a failure.
RLG
Active Member
How do you determine what series? I recently picked up a d6c and just trying to get some info . Serial number 76A3460. This info came from the plate on the side of the motor. It has a winch so I can't access the plate on the back of the machine and not sure where else to look.
Nige
Senior Member
RLG
Active Member
RLG
Active Member
Any useful info really. I know the machine has a bad track adjuster and the cat dealer hasn't been very helpful. I just recently got this serial number due to it being covered with paint and I had the machine out of state. I've read some of the older machines had the same serial number as the motors and I'm hoping this is one of them.
Nige
Senior Member
You are correct, and the engine is a D333C model, as proven by the "C" stamped below the Serial Number.
Go back to Post #5 regarding the Parts Manual. Cat Publication UE035000 covers all 76A-prefix machines up to S/N 6061 which includes yours. It is still available for download from Cat if you can't find a used paper version for sale.
One thing to bear in mind is that the tractor Parts Manual will NOT cover the hydraulic system or the blade. In that era each of those had a separate manual. You will find the Serial Number of the Hydraulic Control on a plate fixed to the hydraulic tank. The plate on the blade probably disappeared years ago. Photos may assist in identifying what you have.
Based on the Serial Number 76A3640 was built very early in 1966. (1965 production was 2107-3593) See Post #3 above by @OzDozer for more information.
There are also links to Service Manuals in various posts above. Here is one for sale on eBay
Nige
Senior Member
RLG
Active Member
Yes and without the serial number they said there were 25 different options. I would assume the parts manual will have the parts numbers i will need.
RLG
Active Member
Nige
Senior Member
Seeing as it covers all 76A machines up to 6061 you would be correct.
You have a 39G-prefix 2-valve 163 Hydraulic Control. The Parts Manual for it is UE070087.
I'm afraid the blade Serial Number doesn't make any sense. Maybe someone can identify it from the photo.
*** were they on about.? 76A3460 (or 76A03460 in today's numbering system) IS the Serial Number. They probably don't realise that back in the 1960s both the tractor and engine carried the same Serial Number.
The problem for the dealer parts guys is that although their system does recognize 76A as a valid S/N prefix little or no parts information actually appears. For example there is no information at all regarding the entire power train or the undercarriage.