The piston *centralises* in the solenoid when power is applied, so it all
depends on whether the piston is pushed in past the centre or pulled out
past it. There is no return spring inside the solenoid, so de-energising
the coil leaves the piston where it is unless gravity overcomes friction.
In use it seems to me that oil pressure pushes the piston back to its
resting place once power is removed.
----- Original Message -----
From: "Tyson Sherman" <mts3@ra.msstate.edu>
To: <mgs@autox.team.net>
Sent: Tuesday, January 08, 2002 4:51 PM
Subject: LH Overdrive help
> So last night I pulled the solenoid and bench tested it. Putting negative
> on the body and positive on the wire, the solenoid would retract the
> piston. When releasing the 12V, it would not pop back out. Should it
> have?
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