On my Model 12 99E grader (made in 1965), I have a large leak in the hydraulic side-shift rod seal. To stanch the leak, I'd not use the hydraulic side-shift (since the circle side shifts also), and keep the machine operational during the cylinder overhaul. I was thinking that the easiest way to do this is to install a blind flange at the connections to the junction assembly as shown in the attached annotated photo. Questions:
1. Are such blind flanges commercially available? (Yes, it wouldn't be hard to fabricate them.)
2. Do these split flange connections have a name? The casting says "Anchor" which could be Anchor Fluid Power which still exists, but I don't see anything matching in their catalog.
3. If I ever needed to replace that hose, do ordinary hose shops have the mating fittings?
4. Slightly unrelated, what are the stabilizer cylinders used for, as shown in the pdf page attached? There's nothing in the service or operations manuals on these.

Hi Bernard, there is a thing called a "penny", they do come in different sizes to match the fitting you have to plug, just remember the fittings have different diameter and thickness where crushed inside the lip of clamp, for example a 61 and 62 series (61 is thinner than 62 but same diameter). that is what we would use here is Aus

they are sae code61 fittings. any hydraulics shop has them. the hose you use with those is sae R100a2 spiral wire hose. most of those fittings used on cats back then are dash 12 size so that is 3/4 internal dia. a dash is a 16th of a inch.

note there is a difference in the current cat code61 fittings, the flanges are thicker and need a spacer if you mixing genuine cat clamp plates with aftermarket hose ends. the classic machines didnt have this difference though. just be aware of it if you buy new stuff from your dealer it has that difference. they are oring sealed dont reuse the oring fit new one when you disturb them. blanking plugs are available. i wasnt aware of a difference till the hydrualics bloke asked me was it old stuff or modern when we had a hose replaced.

oh and heres a tip with the rams if the shafts are worn, damaged or pitted dont bother recroming the rod its cheaper to re-rod them. we had the a pair of rams rebuilt with rods custom made, the machinist reused the pistons and rod ends and assembed em with new seals it cost under $900aud. we were quoted $700 just to rechrome one rod.

ryco, parker hannefin, and gates all do fittings for code 61 and 62. adapters are also available. those are field replaceable. provided the fitting isnt damaged they are perfectly safe just fit new grade8 bolts when you fit new hose.

these old girls didnt work over 1500 psi that why the rams were so large.(bigger piston surface area means more power for the same driving pressure)

all you need is a grinder with thin cutting wheel, a hacksaw, a bench vice, bearing grease a couple of spanners, a mallet, patience and elbow grease.

If you have measured correctly as per your image then that is not a -12 but a -08 which has a hole spacing of 1.5" x 0.69.
Your better off replacing the hose with a new crimped hose rather than trying to refit a new hose.to the old fittings.Not all hydraulic shops carry the flange type hose tails and you may need to either get them ordered in or use adapters.

i spelled the hose type wrong its sae 100r2at. and yes dash-8 is the other common size which is 1/2 inch bore. yes crimped or wind on fittings are better than clamp on. thats why with the conversion im doing i have used wind on type jic fittings and code 61 adapters. it allows me to change the hose with out special tools if i need too. and available anywhere.

did you measure internal or outside dia? all pipe and fittings are measured internally the exception is metric"blueline" polyethylene irrigation pipe it is measured od just to be different.

Pipe is measured internally and so is hose but hydraulic and pneumatic tubing (steel, stainless steel, copper, plastic etc) are measured by the OD.
Blue striped pipe is not designed for irrigation. It is a pressure pipe suitable for mains pressure connection and potable water. Not sure why they call it pipe when it is measured to tubing standards. Green striped is for irrigation purposes.

Thank you all for solving the mystery. Code 61 nominal 1/2" it is. And after looking again at my photo, it looks like is says "1/2" after the word "ANCHOR". According to SAE J518, the screw spacing for 1/2 nominal Code 61 (which is called "standard pressure series" in J518) is 1½  x 11⁄16 , and I've attached two screenshots of it. I was off by a sixteenth in my measurement of the smaller dimension. The diameter I measured was OD, figuring this was tube, not pipe. So back then, Cat hadn't yet introduced their own modified version of Code 62. Fascinating.