CASTLE TSM-21 - Page 22

4. Press and hold the manual override button on the clamp solenoid.
5. If the clamp cylinder does not extend, then the Clamp Solenoid may be stuck closed or
clogged.
6. If the Clamp Solenoid is stuck open/closed or clogged, Perform procedure 21.10,
Unclogging the Clamp Solenoid.
Fig 4b
Castle Inc
TSM-21 Diagnostic Manual Parker/Humphrey Solenoids
Page 22 of 67