On 2008-05-16 17:52:44 +0100, "The Medway Handyman"
said:

I'm assuming this machine has a swash plate pump, unlikely to be anything
else (just looked & it does). There are two parts to the head, the pressure
head & the crank, called housing 1 & housing 2 on this diagram


WHat is a swash plate pump and how does it work? Enquiring minds need
to know.