Wanted - handbook for Engine driven ZF air compressor

Hi, wasn't sure where to post this one.

Looking for a manual or data sheet for a ZF Friedrichshafen AG engine driven air compressor, please.
I think this dates back to around 1965 or before.
I have emailed ZF, but not had a response.

I presume 7636955189 is the model?
No idea what the 3.71 means
Thanks

The ZF unit is a hydraulic pump for the steering unit/servo/other minor hydraulic consumer. Mounted on the back of an air compressor..

You have the compressor identification plate, on the compressor's crankcase.


On the other hand, what's the problem ?

3.71 is the date of manufacture, march 1971.

3.71 is the date of manufacture, march 1971.

Brilliant. Many thanks for that information