Posted for "Gerard O Connell" <goconnell@dodo.com.au>:

Had the same problem as described re gear not coming down after a long
flight..moving the dump lever slightly causes the motor to cut in and drop the
gear

I replaced the dump valve and have since made a 2.5 hour flight. Selected gear
down and no worries..
I also had a strange buzzing noise which appeared to be airspeed related and
coming from the nose area / front of aircraft. I suspected a sagging nose gear
door and eventually a ground observer advised that the nose gear door was at
least one third open after gear retraction. This was not reproducible on the
ground. Everything closed tightly during "retracts" with the aircraft on
jacks. The buzzing noise has now gone, hopefully for good.

I am also getting a lot of gear pump cycling on the ground..it clicks every 30
secs or sometimes more..any suggestions?..am thinking the low side pressure
switch may need adjusting..

I spoke to another owner who fitted a small accumulator to his hydraulic
system which solved all "clicking" however his is a 24 Volt system.

Gerard