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Check Oil Level

Open electrical cabinet and visually inspect the clear oil reservoir tank mounted near the lubrication pump. Oil level should be visible above minimum mark.

Ensure main power is locked out before opening electrical cabinet

Refill Reservoir

If empty, refill with Haas-approved Way Oil (Mobil Vactra #2 or equivalent ISO 68 slideway oil). Fill to maximum line on reservoir.

Use a funnel to prevent spillage and contamination

Prime System

After refilling, manually cycle the lubrication pump using the LUBE button on the control panel or through CURRENT COMMANDS > COOLANT/LUBE menu to prime the system.

May take several cycles to fully prime if system was completely empty

Reset Alarm

Press RESET button and verify alarm clears. Monitor pressure gauge if equipped to confirm proper operating pressure (typically 15-25 PSI).

Verify Pump Operation

With power on, activate manual lubrication through CURRENT COMMANDS > COOLANT/LUBE menu and listen for pump motor operation. Should hear distinct motor running sound.

Keep hands clear of moving parts during pump operation

Check Electrical Connections

Inspect pump motor electrical connections for loose wires, corrosion, or damage. Verify 24VDC supply voltage at pump terminals using multimeter.

Check fuse F7 (Lubrication) on the main control board if no voltage present

Test Pump Output

Disconnect output line from pump and manually activate. Should see steady oil flow from pump outlet. No flow indicates internal pump failure.

Place container to catch oil and clean up spills immediately

Replace Pump Assembly

If pump motor runs but no output, or motor doesn't run with proper voltage, replace complete lubrication pump assembly with Haas part number specific to machine model.

Inspect Distribution Block

Locate the main lubrication distribution manifold (typically mounted on machine base) and check for oil weepage or blockage at individual outlet ports.

Look for dried oil residue which indicates previous leakage and potential blockage

Check Individual Lines

Trace lubrication lines from distribution block to each lubrication point (spindle, ballscrews, linear ways). Look for kinked, crushed, or disconnected lines.

Support machine axes before disconnecting any lubrication lines

Clear Blockages

Disconnect suspected blocked lines and use compressed air (max 30 PSI) to blow out debris. Flush with clean way oil if necessary.

Work from distribution block toward lubrication points to push debris out

Verify Flow Restoration

Reconnect all lines and manually activate lubrication system. Verify oil flow at each lubrication point and confirm pressure alarm clears.

Locate Pressure Switch

Find the pressure switch mounted on the lubrication distribution manifold or pump assembly. Typically has electrical connector and threaded fitting into oil line.

Switch is usually labeled with pressure rating (15-25 PSI typical)

Test Switch Continuity

With system pressurized, use multimeter to check continuity across pressure switch terminals. Should show closed circuit when pressure is adequate.

Disconnect power before testing electrical connections

Verify Input Signal

Check NGC diagnostics under SETTINGS > DIAGNOSTICS > INPUTS to verify lubrication pressure input status matches actual system pressure.

Input should show active/high when lubrication system is properly pressurized

Replace Pressure Switch

If switch fails continuity test or provides incorrect signal, replace with identical pressure rating switch. Apply thread sealant to fitting.

Verify Oil Specification

Check oil type against Haas specification (ISO 68 slideway oil). Wrong viscosity oil can cause pump performance issues and pressure problems.

Haas recommends Mobil Vactra #2, Shell Tonna S2 M68, or equivalent

Inspect Oil Condition

Check oil color and consistency. Contaminated oil appears dark, thick, or contains visible particles that can clog system components.

Dispose of contaminated oil according to local environmental regulations

Drain and Flush System

If oil is contaminated or incorrect type, completely drain reservoir and distribution system. Flush with clean solvent if heavily contaminated.

Run pump briefly with solvent to flush internal passages, then drain completely

Refill with Correct Oil

Fill system with fresh, Haas-approved way oil. Prime system and verify proper pressure operation before returning to production.