Strathroy kindly sent me his hydraulic spoiler system for exploratory diagnosis.
The interesting thing I have discovered so far is that the pump unit seems less a pump than a pair of cylinders which when stroked by the motor ram assembly, force oil proportionally down the cylinder lines so that the spoiler cylinders then must rise together in unison, as long as there is equal fluid volume in the pusher cylinders. Simple and effective. Probably the only issue is to replace the spoiler cylinder seals as they age, to keep the fluid levels equal. Does anyone have any tech info on the sensors, wiring or anything else related?
Bob

 

Is it mount on a screw or ??? Can you post some pics of the internals? Thanks

 

Its all hydraulic but the electric motor drives the primary cylinders which in turn push the spoiler cylinders. I'll try and post pictures tomorrow.
Bob

 

There has to be a weak part on this pump. Because there is many failure reported...If you can found something please post it!

 

JPflip;
It looks like the pump is not the problem but rather the slave cylinders which lift the spoiler.
On Strathroy's system I'm seeing slight leakage around one slave rod seal. Over time this would cause that cylinder to rise behind the other side due to air compression. I'm going to replace the seals on Strathroy's system and let them sit under a test rig load to 'prove' their performance.
It is also relatively easy to replace the motor side cylinder seals should that be the problem for anyone, but I have been told by Strathroy and agree this is less likely to cause problems. So far this has been kinda fun !
Bob

 

Very interesting. We are learning every day but the word "slave cylinder" is starting to make me sick ;-) (infamous clutch slave...) . Anxious to see your conclusion...

 

The good news is that the hydraulic pressures are extremely low probably 10 - 100 PSI, so the seals are very lightly stressed.
My submarine systems are rated at 10,000 PSI, yet leaks are not an issue.