D8 15A blade hydraulics

I used a screwdriver through the perforated plate to gently clean some of the crud off the tag and as best I can read it says 79E71. Below the serial are the words "Hydraulic Control" and a heap of numbers that are barely legible. So I am guessing that this is not a Cat hydraulic control.

Hello brian18a
Thanks for the info. From what I have read the 8 is for D8 and the 3 is for number of valves. Nobody seems to know what the 1 is for.
Typing "Cat 183 Hydraulic Control" into ebay search and all the manuals show the oil tank and control valve mounted on the fenders. This machine has a front mounted oil tank and valve in the bubble shown in the pics and has a completely separate hydraulic system for the rippers. I can't tell if it has more than one valve. I also can't tell if it is the same tank as the fender mounted version.
Obviously this is a home made design not a Cat design and I don't know why they put the tank on the front. To fit it there they had to move the trunion mounts for the C-frame about 3 feet forward so it would clear it. This caused increased load on the idlers. They also removed the springs and replaced them with a solid block. This resulted in cracked chassis rails.
Do you know where I would find a manual for the UK built system?

Hi Team,
a Cat Of Australia Service Letter (April 16/196😎 Equivalent Serial Number cross-reference I have here says that the UK built 79E1-up 183 Hyd. control is same as the US built 36E18-up.
Hope this helps.
Cheers,
Eddie B.

I'm not sure on the stamping, I kind of think not.
If it's factory period correct it will be either a #30 CCU, with a 54C s/n (early) or a 27E (late) with the 27E most likely.
Here's a couple of pictures of a 27E...