556

Check air pressure at machine supply - verify minimum 6 bar (87 psi) for pneumatic systems or hydraulic pressure per machine specs.

Inspect air filter/regulator unit for clogging or water accumulation - drain and clean if necessary.

Manually actuate the drawbar solenoid valve and listen for air flow or pressure change - replace valve if defective.

Lockout machine and verify spindle is stopped before manual valve actuation.

Check for air/hydraulic leaks in lines from valve to spindle drawbar cylinder - repair or replace damaged fittings or seals.

Access spindle head and locate the tool clamp confirmation switch (usually near drawbar or rear of spindle).

Lockout machine power and depressurize air/hydraulic systems before opening spindle head.

Check switch LED indicator or use multimeter to verify switch state changes when drawbar moves between clamped/unclamped positions.

Clean sensor face and target area of metal chips, coolant residue, or contamination - verify proper sensing gap per manufacturer specs (typically 1-2mm).

Verify switch wiring connections at switch body and PMC input terminals - replace switch if defective or signal remains inconsistent.

Remove tool from spindle and inspect taper bore and pull stud pocket for chips, debris, or damage - clean thoroughly with solvent and compressed air.

Wear safety glasses when using compressed air.

Manually cycle drawbar mechanism using manual release or diagnostic function - verify smooth movement without binding through full stroke.

Follow manufacturer procedure for manual drawbar release to prevent spring-loaded component injury.

Inspect Belleville spring stack condition and drawbar collet fingers for wear, cracks, or deformation - replace worn components per OEM parts list.

Lubricate drawbar sliding surfaces with recommended grease (typically lithium-based) and cycle mechanism multiple times to distribute lubricant.