Odd grease fitting on Cat 307 excavator stick hydraulic cylinder

Jackson · Mar 30, 2019

this cylindar was out for rebuilding and came back missing the fitting. Actually it looks like the cylinder is supposed to have a line connected where a zerk would normally go and that line would go to a more accessible spot for easy greasing. For the life of me I can’t find anything to fit the threads on the cylinder. Any suggestions?

Nige · Mar 30, 2019

We aren't wizards you know. How about a machine Serial Number and a photo..?

John Shipp · Mar 30, 2019

No Nige, gotta love the extra challenge. Lets see, did you try unscrewing the grease fitting off the grease gun, and see if the threaded hose end fits? 1/8 pt. Total guess, but might be lucky bullseye.

kshansen · Mar 30, 2019

Nige said:
We aren't wizards you know. How about a machine Serial Number and a photo..?

Nige, It's not like there are a dozen different S/N prefixes! OH! wait just counted and there are sixteen!

And knowing Cat there are more than a few different S/N breaks for most of them.

To the Original Poster, also known as the OP, we are trying to help not just you but everyone who is reading this. The simple fact is the better and more complete the information one gives up front the faster and better the information will come back to you!

Pixie · Mar 31, 2019

My serial # starts 9ZL .....

Nige · Mar 31, 2019

Pixie said:
My serial # starts 9ZL .....

A grey market machine equivalent to a 2PM-prefix Serial Number. There is a Serial Number break at 2PM00256, above that number the parts information is different.

kshansen · Mar 31, 2019

Might be a crazy thought but did you check with the shop that rebuilt the cylinder to see if the fitting was sitting on someones work bench?

Who removed the cylinder to send it out? Was the fitting in there at that time?

A picture would answer many questions.

DMiller · Mar 31, 2019

We had Cap type lube fittings on fixed equipment in the Power Station, flat and a button looking head.

kshansen · Mar 31, 2019

DMiller said:
We had Cap type lube fittings on fixed equipment in the Power Station, flat and a button looking head.

You mean like these:
https://source4industries.com/linco...MItaGM4qqt4QIVSpyzCh2lPgwLEAYYAyABEgJh1PD_BwE

Had a couple stationary units with those, believe they were on something in the Black Top mill. I know they come in two different sizes believe they are either 5/8 or 7/8 diameter on the buttons.

DMiller · Mar 31, 2019

Those would be the monsters. Saw them at the Quarries too, usually on the severe duty greaseable mechanisms and some electric motors.

buckfever · Mar 31, 2019

I have a bobcat 442 (Terex) that has those on the slack adjusters.

heymccall · Mar 31, 2019

Everything I see on that is 1/8-27, Like most of my Cats.

JD955SC · Apr 2, 2019

If it’s serviced by the grease line there should be an adapter that threads into the hole for the grease line to connect to. Should be easy to find in SIS

They probably took it off and forgot to put it back on

Nige · Apr 2, 2019

Well the OP has never been back since he first posted so I guess we'll never know ...........

kshansen · Apr 2, 2019

Nige said:
Well the OP has never been back since he first posted so I guess we'll never know ...........

Guess this will be another "Zombie Thread"? Strange how some will come on here with a question then disappear, checked this guys history and he was first on here back in 2011!

Pixie · Apr 2, 2019

Well I learned something ! Thanks, Nige, I didn't know about the serial # break. I have the correct parts book in Japanese but my English version is after the break. I haven't found much different in the books.

And those big grease fittings are interesting, too !

Nige · Apr 2, 2019

If it’s 1/8” NPT thread then the correct part number for a regular grease zerk fitting is 3B-4849.

Whether your 9ZL machine falls below or above the Serial Number break would depend on what comes after 9ZL. The S/N break is not 00256 on the 9ZL range. I’d have to look to find out, that’s a job for tomorrow.

Nige · Apr 3, 2019

Serial Number break on 9ZL-prefix is 2310. See below.

Pixie · Apr 3, 2019

Thank you very much, Nige !

Pixie · Apr 3, 2019

Hmm... my serial # doesn't match up well. It's 9ZL042xx.

My Japanese parts book is for 9ZL02311-9ZL078701.

Odd grease fitting on Cat 307 excavator stick hydraulic cylinder

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