5.19 Drive Cylinder Check 21.60
The Drive Cylinder provides the forward and back stroke to the Motor Carriage for the Router
and Pilot Drill phases. If the cylinder fails or if the air lines become clogged, the machine may
not complete one or both of these phases. Occasionally the cylinder seal may need to be
reseated. Do this by rocking the
carriage back and fourth by hand with the work top in the up
postion. It is normal to detect a “puff” of air at the at the exhaust ports of the Router and Drill
Solenoids when rocking the carriage.
5.19.1 TO DETECT A BAD CYLINDER SEAL:
1. Un-plug or turn off both routers.
2. Connect power and air to the machine, and turn the Power Switch ON.
3. Place a piece of scrap wood against the Safety Buttons and depress the Foot Pedal to
induce a stall during the router stroke.
4. Listen for constant hissing and feel for leaking air at the exhaust ports of the Router
Solenoid and the Drill Solenoid. See Fig 20a and 20b.
If the cylinder seal is dry, damaged, or not seated properly, air may bypass the cylinder piston
and constantly exhaust out of the exhaust ports of the Router and Drill Solenoids. (often
accompanied by an audible hissing sound).
Fig 20a
TSM-21 Diagnostic Manual Parker/Humphrey Solenoids
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