Case w7 master cylinder

For the brain trust, looking for a repair kit for a case w7 master cylinder, I know it is a long shot as it was built in the 60's. Mine leaks out of the push rod end but work great when I can keep fluid in it. Thanks for any help you can give me. Neil

Someone may be along with a kit number for you. However, from the parts books it appears the W7s used two different master cylinders, one for straight hydraulic brakes and another for the Hydrovac brakes. So you need to know, and tell, which you are looking to get a kit for. Both master cylinders and parts kits show as unavailable in the Case parts books.

Many of those master cylinders and other brake system parts were made by Wagner back then. You may find a number cast into the housing that a good parts store (Traction, which deals in truck parts might be one) may be able to use that number to identify the cylinder and get a lit or replacement. You could contact the YT Store to see if they have anything (nothing for brakes shows in the on line listing of parts. You might contact Beauregard Equipment, they are your local Case dealer and someone there may have some notes of what fits as there are still a number of W7s around. Saeli*Implement is another that might possibly be able help. Another way is to take it apart and work with a parts store to find a kit with parts that match yours, bore diameter is a starting point. I know this would be your last resort as you say it works if you keep fluid in it.

If you don't have a parts book, here is a link to the Case W7 on line parts book.

Case W7 Parts Book

I haven't worked on any in a while,but I got a lot of master cylinder parts from a place called,Trans-Axle,and I believe it was in
Cinnamon N.J.Not sure if I have the spelling of the name right,but if it is still in business you should be able to track it
down.I've gotten kits for Hough,Case,AC,Huber,Nelson,and a few others.I got a kit for my old Lorraine loader from them.It had a
Wagner cylinder and was told that the master in that machine was used in probably 85%of the machines of that era.You WILL need to
have the cylinder and measuring tools in front of you when you talk to them.They will just tell you to call back when you have the
part out and apart.The same casting number part can be bored in a dozen different sizes and configurations.The master in my
Lorraine has the same number on it as the one in an H 30 Hough,but the Lorraine one is straight bored,and the one in the Hough is
step bored,and uses two different sized cups.

What model Lorain did you have?

X2 on looking it up by the casting number.

A real old school auto/truck/equipment supply can look it up by that number.

Chances are if you did put a kit in it, it would be short lived as they tend to rust pit in the bottom of the bore.

Another alternative would be to send it to a rebuilder that can plate the bore and return it to like new. That would be a last resort as it would be time consuming and probably expensive. Check with antique car restoration forums for a reference.

PS: What fluid does that use, oil or brake fluid?

Makes a huge difference! The cylinder MUST have compatible cups to match the fluid required for the system.

Should be brake fluid.
Case didn't start using oil until the early 80's

If you can't find a kit take apart hone it slightly
Find replacement cups of same Dia. The Dia. is usually molded in the rubber.
Some parts houses
Should be able to find them.

Wagner, Lockheed, others supply them.
I know if you goggle the size cups you need, you
Will find them online.
Tom

I can't quite remember what the model is.It has the J-130 Cummins,and has 14-24 rubber on it.I can picture the model stamped into the plate that says the Thew Shovel company on it.Allison transmission with the two pedal control.I got it from the man that bought it new in 1963.Stll straight and tight,and can still be driven down the road frontwards.I need to go through the brakes on it again,I don't know why,I rarely use it anymore and have not started it this year at all.