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Check the spindle lubrication oil reservoir level visually or via sight glass. Fill to proper level with manufacturer-specified spindle oil (typically ISO VG 32 or as specified).

Ensure machine power is OFF before opening reservoir. Use only approved spindle lubricant.

Inspect oil level sensor/float switch in reservoir for proper operation. Clean or replace if stuck or damaged.

Check for external oil leaks around spindle housing, lubrication lines, and fittings. Repair any leaks found.

After refilling, manually cycle the lubrication pump (using PMC or manual button) and verify oil flow to spindle. Reset alarm and test spindle operation.

Listen for lubrication pump operation during spindle startup. Check pump motor for 24VDC or appropriate voltage supply using multimeter. Verify PMC signal Y-address for pump activation.

Lock out machine power when checking electrical connections.

Inspect oil filter cartridge (typically located near pump or on spindle head). Replace filter if clogged or contaminated. Check oil quality for degradation or contamination.

Disconnect oil delivery line at spindle and manually activate pump. Verify oil flow from line. If no flow, check for kinked or crushed tubing and clear blockages.

Place line into container to catch oil. Wear safety glasses.

If pump runs but produces no flow, replace lubrication pump assembly. After replacement, prime system by running pump and bleeding air from lines.

Locate the lubrication pressure switch (typically on spindle head or lubrication manifold). Check wiring connections for damage, corrosion, or loose terminals.

Using PMC ladder diagnosis (on CNC screen), monitor the pressure switch input signal (X-address). Verify signal changes state when pump operates. If no change, suspect faulty switch.

Disconnect pressure switch and test continuity with multimeter. Normally open switch should close when pressure applied. Replace switch if defective (typical model: 0.2-0.5 MPa setting).

Relieve oil pressure before disconnecting switch to prevent oil spray.

After replacing sensor, adjust pressure threshold per machine specifications (if adjustable). Reset alarm, run spindle warmup cycle, and verify alarm clears during normal lubrication cycle.