CASTLE TSM-21 - Drill Solenoid Check

5.18 Drill Solenoid Check 21.51
The Drill Solenoid controls air pressure to the side of the Drive Cylinder that provides the forward
motion of the Drill’s boring stroke. If the Drill Solenoid has stuck open, the drill will extend as
soon as air is attached to the machine, regardless of whether the power is turned on. If the Drill
Solenoid is clogged the Drill may not start or complete the pilot hole.
5.18.1 TESTING STEPS:
1. Connect the shop air supply to the machine.
2. If the drill automatically extends, then the Drill Solenoid is stuck open.
3. If the drill does not extend, open rear door and locate the manual override
button on the drill solenoid. See Fig 19a and Fig 19b.
Fig 19a
Castle Inc
TSM-21 Diagnostic Manual Parker/Humphrey Solenoids
Page 43 of 67