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Check coolant tank level and refill if low. Verify coolant pump is running when chip flush is commanded.

Inspect and clean the coolant filter cartridges. Replace if heavily clogged or past service interval.

Verify chip flush pressure at the spindle using a pressure gauge. Should typically be 300-1000 PSI depending on machine specification.

Check pressure switch functionality by monitoring I/O signals during chip flush command. Replace pressure switch if no signal change occurs at proper pressure.

Locate the chip flush solenoid valve (typically near coolant tank or on machine frame). Listen for click when M-code commands chip flush activation.

Measure voltage at solenoid coil terminals during activation command. Should read appropriate voltage (typically 24VDC or 110VAC). If no voltage, check PLC output and wiring.

Lockout/tagout required when measuring live electrical circuits

If voltage present but no click, measure coil resistance (typically 20-200 ohms). Open circuit indicates burned coil requiring solenoid replacement.

Disconnect power before resistance measurements

Manually actuate solenoid plunger to check for mechanical binding. Clean or replace valve if stuck or corroded internally.

Remove tool holder and inspect chip flush nozzles in spindle nose for blockage. Clean with compressed air and wire brush if obstructed.

Wear safety glasses when using compressed air

Check rotary union at rear of spindle for leaks or seized bearing. Coolant leaking externally indicates seal failure preventing proper pressure buildup.

Disconnect chip flush supply line at spindle and command flush activation. Verify strong coolant flow from supply line to isolate blockage location.

Direct coolant flow into container to avoid spills

If external flow is good but no spindle discharge, remove and disassemble rotary union. Clean passages and replace seals/bearings per manufacturer specifications.

Consult spindle manual for proper rotary union service procedures to avoid spindle damage