Cat D6C Accessory shaft

[sbsimkins1]

I recently bought a Cat D6C 76A5186 with a fuel problem. There was a small electric fuel pump hooked up to it and it started and ran so I bought it thinking I would just fix it up. It turns out the fuel pump was rusted solid and it broke a gear tooth on the pump and bent the rod. It also broke a gear tooth on the accessory shaft. I believe I have found all the parts to fix the pump but I can't find an accessory shaft. The parts book calls it a 1S7401. If anyone knows somewhere to source one of these or an alternative fuel pump I would really appreciate it.

 

[Nige]

The 1S-7401 shaft is discontinued by Cat but still showing as available with aftermarket suppliers such as AVSpare.

SHAFT 1S7401 - Caterpillar | AVSpare.com

spare.avspart.com

 

[8V71]

Looks like they’re several on machinery trader. Go to find parts put in the part number several vendors will come up I do have a D333 that I’m going to part out that was in a 977 if you can’t find what you need for it.I’ll put serial number up soon.

 

[sbsimkins1]

Looks like they’re several on machinery trader. Go to find parts put in the part number several vendors will come up I do have a D333 that I’m going to part out that was in a 977 if you can’t find what you need for it.I’ll put serial number up soon.

I didn't know machinery trader had a parts section. I'm relatively new to heavy equipment though. Thank you.

 

[Nige]

Use this link - https://www.machinerytrader.com/parts/search

 

[tctractors]

You will need a Timing fixture plate to lock in the drive I feel in the correct position?

 

[D6 Merv]

No plate needed on a D6C 76A Tony.
Gear is keyed to the shaft, you can,t alter timing.

 

[tctractors]

I popped out to a Plant dealers the other day to a 333C to set the timing on the A'Drive not key in the shaft chap 4 3/4" bore motor.

 

[D6 Merv]

Very true TC; BUT a 76A is 4.5" bore D333 engine, same as you guys 83A machines

 

[tctractors]

Very true TC; BUT a 76A is 4.5" bore D333 engine, same as you guys 83A machines

I wish people would not think the D333 engine is just 1 engine type, 333B is nothing like a 333C, or possibly I need to read things better and stop listening to music at the same time.

 

[kshansen]

I wish people would not think the D333 engine is just 1 engine type, 333B is nothing like a 333C, or possibly I need to read things better and stop listening to music at the same time.

So what music you listening to? I tend to go off topic so figured this would be as good as anytime!

I have to blame Cat a bit for being too lazy with coming up with new model numbers and just tossing a letter in there to confuse people!

 

[OzDozer]

There's actually a D333A (4.5" bore), and a D333B (4.5" bore - same engine), as well as the D333C (4.75" bore, which later became the 3306).

Little wonder Cat went over to the "3000 series" numbering in the early 1970's - imagine the number of c***-ups that went on inside the Caterpillar operations, as Cat employees left letters off!

The basis of all Cat engine ID is on the bore diameter, and that was the standard Cat engine ID system from the early 1930's, even though they did also use a letter/number engine ID as well, back then.

 

[Mcrafty1]

"There's actually a D333A (4.5" bore), and a D333B (4.5" bore - same engine), as well as the D333C (4.75" bore, which later became the 3306)."

Oz, (or anyone in the know) I have a D6C serial# 76A-5579 Which I believe has the D333A or so I was told. My question is what are the differences (roughly speaking) between the A model and the B model? and when did that change come about? I haven't had to order parts for my engine at this point but if I ever do it would be good to know what I'm looking at in terms of series of engine I have.

 

[D6 Merv]

Basically D333A is naturally aspirated engine as in 44A D6B.
D333B is the turbocharged version as in 76A D6C.
differences in turbocharged engine were piston cooling jets, oil cooler, cylinder head with valve inserts, and no doubt some others ive forgotten about
And for ordering parts, go off a 76A parts manuel, your engines in that book

 

[Mcrafty1]

Thanks, my engine is turned so I guess is a B, probably not much of a issue when it comes to ordering parts anyway. Thanks again for the reply.

 

[Mcrafty1]

.... turbocharged. Spell check wouldn't accept anything else.

 

[sbsimkins1]

There seemed to be a conflict on if I need the timing fixture plate or not. Also has anyone convered one of these dozers over to an electric fuel pump?

 

[tctractors]

No timing plate needed on the early engines as the gear and shaft is key locked, the later 333C series needs the timing plate you have the 333B series engine with the small bore, as for fitting an electric fuel pump I would tend to think it a better idea to sort the as fitted item, I have these pumps on the shelf myself in the U.K. so they must be common enough to find in the U.S.

 

[sbsimkins1]

No timing plate needed on the early engines as the gear and shaft is key locked, the later 333C series needs the timing plate you have the 333B series engine with the small bore, as for fitting an electric fuel pump I would tend to think it a better idea to sort the as fitted item, I have these pumps on the shelf myself in the U.K. so they must be common enough to find in the U.S.

Yeah I can find them but they are 500+ and I was hoping for a cheaper quicker fix but I'll probably just do it right. Thank you