That's a TRW/Ross power steering unit, the valve body part number is on there - V142498. I suspect it's a V14 model steering unit.
Not sure about parts availability, first step is to acquire a parts book for the V60B forklift.
There are 17 different serial number prefixes for the V60B, depending on engine type and make, transmission style, and where it was manufactured.
The 4 different prefix V60B models built in the U.K. are 51W, 55W, 56W and 58W.
These are originally a Towmotor forklift, Cat bought Towmotor in 1967, and they were called Towmotor Caterpillar forklifts for several years after the takeover.
I've had good customer experience with Midwest Steering, they have parts diagrams on their site for a range of steering units. The V14 is listed, second from the bottom of the list.
Parts Diagrams. Midwest Steering parts Diagram Page. Links to important diagrams, Eaton Char Lynn, Parker/TRW/Ross, Hydraguide
www.midweststeering.com
Riverdale Farm Shop will also most likely be able to assist you with your problem, here's their website.
Tractor repair, new and used parts, restoration, sales, specializing in Minneapolis-Moline
www.riverdalefarmshop.com
This particular TRW/Ross steering unit was also fitted to some IH tractors and trucks.