Castle TSM-21 Diagnostic Manual - Manual (Page 36)

5.15 Drill Single Coil Bar Spring 21.42
The Bar Spring is located inside the top of the machine, above the Control Box. The Motor
Carriage compresses this spring as it moves forward to drill the Pilot Hole. After the Pilot Hole is
drilled, the Bar Spring provides the push to return the carriage to neutral position. If you push
the carriage forward by hand it should “spring” back when released. If the carriage remains
forward the Bar Spring may be loose or broken.
5.15.1 REPLACEMENT STEPS:
1. Disconnect air and power from the machine.
2.
Remove the two carriage bolts that hold the Control Box to the machine. Leave the box
hanging in place.
3. A small rectangular plate anchors the Bar Spring. Note how the spring slides between
two bolts in this plate. Loosen the nuts and remove the old spring and slide in the re-
placement spring.
4. The short elbow at the end should face up toward the inside of the case top. Place a
plastic cap on the tip of the elbow and apply a small amount of lubricant to the plastic
cap to reduce friction resistance. See Fig 17.
Bar Spring Motor Carriage
Carriage Bolt
Fig 17
5.
Make sure the Bar Spring is on the front side of the 3” carriage bolt and tighten the nuts.
Castle Inc TSM-21 Diagnostic Manual v2 Page 36 of 63