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Check oil level visually

Open the electrical cabinet door and locate the clear lubrication oil reservoir. Check that oil level is between MIN and MAX marks on the sight gauge.

Ensure machine is powered off and locked out before opening electrical cabinet

Add appropriate lubricant

If low, add Haas-approved ISO 32 hydraulic oil (P/N 93-32-5GAL) through the fill port until level reaches MAX line. Do not overfill.

Use only Haas-approved lubricants to maintain warranty coverage and optimal performance

Prime lubrication system

Power on machine and allow lubrication pump to run through several cycles. Monitor pressure gauge and verify alarm clears within 2-3 minutes of operation.

Locate lubrication filter assembly

Find the cylindrical filter housing in the lubrication circuit, typically mounted near the pump assembly in the electrical cabinet.

System may be under pressure - relieve pressure before disconnecting filter

Replace filter element

Remove filter housing, discard old element, and install new Haas filter element (P/N varies by model). Clean housing thoroughly before reassembly.

Replace filter every 2000 hours or annually, whichever comes first

Verify system pressure recovery

Restart machine and monitor lubrication pressure gauge. Pressure should build to normal operating range (typically 15-25 PSI) within 30 seconds.

Check pump motor operation

Listen for pump motor operation during lubrication cycles. Motor should run intermittently every 8-15 minutes depending on Parameter 83 (LUBRICATION TIMER) setting.

Parameter 83 default is typically 480 seconds (8 minutes) between lube cycles

Test motor electrical supply

Using multimeter, verify 24VDC supply to pump motor during lube cycle activation. Check connections at motor terminals for looseness or corrosion.

Replace pump assembly

If motor tests bad, replace complete pump/motor assembly with Haas part number specific to your machine model. Ensure proper mounting and electrical connections.

Disconnect main power and lock out machine before replacing pump motor

Locate pressure switch

Find the pressure switch mounted on the lubrication manifold, typically a small device with electrical connections and threaded into the oil circuit.

Test switch continuity

With system pressurized, use multimeter to check switch contacts. Switch should show continuity when pressure is adequate (normally closed type).

Most Haas machines use normally-closed pressure switches that open on low pressure

Verify wiring integrity

Trace wiring from pressure switch to NGC control input. Check for damaged insulation, loose connections, or corrosion at terminals. Repair or replace as needed.

Locate pressure relief valve

Find the adjustable relief valve in the lubrication circuit, usually mounted on the main manifold with an adjustment screw and locknut.

Check valve setting and operation

Verify relief valve is set to proper pressure (typically 30-40 PSI). Gently tap valve body to free any stuck components.

Do not exceed maximum pressure settings specified in machine manual

Clean or replace relief valve

If tapping doesn't resolve issue, remove valve, clean thoroughly with solvent, and inspect for wear. Replace valve cartridge if damaged or excessively worn.