On Mon, 15 Oct 2012, Tony Duell wrote:
I have no idea what it's for. The HDA cannot
be presurised in normal use,
there is a breather filter. One suggestio nwas that clean ar was squred
in there when the HDA was made, forcing any resitual dust onto the
brether filter. Any other ideas?
If there was not a breather, and if you pressurized slightly, then
any leakage would be outwards, keeping dust from entering
However, the Micropolis 1200 certainly has a breather filter. The air
holes for it are clearly visible on the top of the HDA.
The schrader vavle is on the underside, alongside the motor PCB, brake
solenoid, etc. I haev yet to find a convincing reason for it being fitted
at all. Any suggestions?
I have no idea if the HDA-side of the valve has anything fitted to it
(like a filter). I don't have a scrap 1200 to pull to bits to check.
-tony