Fitting Air pump
 

Hi all I am looking for the fitting that screws into the top of the air pump on my f60. The fitting attaches the steel line to the top of the pump .
Cheers larry

Would any one know the size and thread of the fitting on the top of the air pump on a f60 cab 13.
Larry

Answers?
 

Hi Larry: I have 2 of those pumps that I think you and I talked about a couple of years ago. I can send you some photos etc. to see if that helps you out. Or you can buy them off me. PM me your email address and we'll see what we can do.
Cheers....Robert :cheers:

Helping Larry!!!
 

Gentlemen: In regards to Larry's dilemma, we both talked and thought we'd give this a shot in the dark. Larry is looking for a special "bolt" that fits into a CMP Air Pump. I have a pump here and am willing to "LOAN" Larry the "bolt" so he could manufacture one. As per the attached photos, it's a bit of work....not like we've all faced this problem. Anyway I thought I would post some photos of said bolt and see if anyone recognises it and is willing to part with it...you know, people like Rob Love and his beloved secret "dump"!

PM me if you can provide any info or contact me through this entry.

Cheers and many thanks....Robert and Larry :cheers:

Would that not just be a banjo bolt as used on the brake systems of the m35, m37 and m135? There were a couple different threads. If you can measure the threads and let me know what they are, I'll check my banjo bin.

The cross groove on the end of the banjo opposite the hex looks a little unusual, but if the thread and other diameters and lengths match, surely the banjo could be modified to add the groove.

My thoughts as well Grant.
Now that I think about it, I have a compressor hanging on an old 3 ton out in the back 40. I could have a look in a couple days when it warms up and possibly compare the bolt with the spares that I have.

As an aside, in government supply lingo, the bolts were catalogued as " bolt, fluid passage".

Thanks guys yes the thread looks like a(fluid passage bolt) the challege is to find the right diameter. I tried the bolt from the rear brake cylinder in hopes it would fit but of course it was to small but it did look like the right thread .
Thanks again
Larry

Bolt
 

Hi Larry

Bit of a long shot...

Maybe you could ask around and find someone close by who does hobby machining. Have a look at the Canadian metalwork forums.

https://canadianhobbymetalworkers.com/

That bolt could be made on a lathe. I can do it but I'm on the other side of the planet. Get a ruler or better, callipers and count the number of threads over 1/4 inch, multiply that number by 4 and that gives you the threads per inch (TPI)

These guys are in Saskatchewan https://canadianhobbymetalworkers.co...atchewan.2713/

What is the thread diameter?, looks similar to banjo bolts also found on carburettors. If you can tell me the thread size I’m sure they are available here in the uk, just got to file the slot in?

Kevin

Thread size?
 

Gentlemen: Thanks for the input. I've sent the "bolt" off to Larry and he can provide you all the measuements later next week (God willing no postal strike!). Better it comes from one source.

Again, the input is very much appreciated by both parties.

:cheers:Cheers....Robert

I have just picked up the fitting that Robert sent me I did some measuring the bolt has 18 threads per inch and is 1/2 inch in diameter, hopefully there is some other applications that uses that same size and thread.
Cheers
Larry

Conduit
 

Hi Larry

That seems to be a oddball BS electrical fitting thread.. or conduit thread.

It doesn't measure up as being: BSF, SAE, UNF, UNC or NPT, BSP..

18 tpi 1/2" is a very unusual size. Measuring threads is a tricky job, I've been caught out a few times , I now use a magnifying glass and callipers. The thread cutting is done on a lathe , you don't need to begin with a bolt with a specific size thread, lathes have the ability to cut many sized threads , both Imperial and metric. This lady explains it https://www.youtube.com/watch?v=q7scadYptTI

I see 1/2-18 taps and die available online including Amazon. The thread is listed as unified extra fine, or unified S, which is a non standard thread which is for specific engineering requirements. I also see that thread listed on some hydraulic fittings, but didn't go too deep down that rabbit hole.

Corection on the diameter ot the blt size it is 9/16 not 1/2 inch but it is 18 threas per inch i used my thread gauge to verify thanks guys, I am still hopeful to find something.
Cheers
Larry

Good
 

Ah, OK. Being an air line fitting, there is a chance it is a 1/4" NP fitting , which is also 18 TPI but is around .020 smaller than 9/16 “

I do have stored away somewhere, a couple of the CMP Chev tyre pumps, in pieces. Do these have the same fitting ?

Found this pic of the Chev version,it does have a similar bolt.

Edit: had a look and all I can find in my junk is a pump that is missing it's cylinder . So I don't have a banjo bolt that I can use as a sample.

Found this.

https://www.grp4fabrications.com/1-4-npt-banjo-bolt

https://www.proflow.com.au/proflow-f...hnimZQkyqms7WS

That does look like the same bolt the head on the pump looks the same as well, would you have a spare bolt I could buy
Larry

9/16-18 is National Fine thread.
Afraid the banjo bolts I have are either 1/2" or 7/16th.
Thay are made commercially. See here: https://www.fittings.space/gsa29-u09x18m

https://www.jegs.com/i/Fragola-Perfo...50160/10002/-1

Threads
 

Looking at the pics posted by Rob, it probably is 9/16 UNF but there is a chance it could be something else .

Larry,

If it is of any help to you, I could take the bolt off my pump and have it replicated here in The Netherlands at my friendly machine shop?

Thanks everyone all the info is very helpful, I found a place in Ontario that sells banjo bolts so I ordered one now I am keeping my fingers crossed that it fits. The sight that Rob gave me I phoned them but the bolt was to short.
Thanks everyone ill keep you posted when the bolt arrives.
Larry

Length
 

How long is the bolt ?

: Can you measure the length of the middle section where the two holes are and the threaded section length ?

Will be useful to know the dimensions - if anybody else needs one of these special bolts, we will have a reference.

Attempt ?
 

Haven't used my lathe for so long, needed some practice.

This is a prototype...it's too long, I need the proper measurements. A 9/16 unf nut fits on it snug.

Email sent
Larry

The bolt arrived and is 9/16 national fine thread so it is not a match. The bolt i got from Robert is definitely 18 threads per inch.
Larry

Confused
 

Hi Larry

I’m confused now. 9/16 unf is 18 tpi.. I wrote earlier, there's a good chance it is 1/4 National Pipe , which is 18 TPI.

More
 

I still need a critical measurement: the length from the shoulder to the end.

This is my attempt but it' was done flying blind .

That length is 1.120 inch. The bolt you made looks awesome.
Cheers
Larry

Good
 

Thanks. It's a little job , but it helps to keep my eye in.

It's slightly longer than 1 and 1/8 but shouldn't be a problem.I might increase the bore slightly to match the measurement you sent.

Lucky me.....
 

Well as we all know....I was looking for something totally else and came across my second pump, complete with the "banjo bolt". So we have a backup.

Cheers...Robert :cheers: