whohooow found more info on the compressor, the name of the compressor was COMPRESSOR, AIR, PORTABLE TYPE, 4 CUBIC FEET,
GASOLINE ENGINE-DRIVEN-No. 66-C-1380
as stated in this manual http://carl.army.mil/wwIItms/TM9_834_1944.pdf
the compressor is mentioned from page 51.
i was told all this on the Keep Them Rolling forum(dutch WW2 stuff forum)
pictures of the machine in action can be found here
http://forum.ktr.nl/index.php/topic,4060.0.html