Haas Alarm 75 indicates the automatic lubrication system has failed to maintain proper oil pressure or flow to critical machine components. The NGC control monitors lubrication system pressure through dedicated sensors and will trigger this alarm when pressure drops below minimum thresholds or the lube pump fails to cycle properly.
HaasLubricationBasic30-90 minutes
75
HAAS Alarm 75 - Lubrication System Pump Failure
Lubrication system pump failure
This alarm indicates the MOCON board has detected a failure in the lubrication system pump circuit, either from a faulty pump motor, blown fuse, or interrupted feedback signal from the lube level switch. The machine will not allow operation until the lubrication system is verified functional to protect the ways and ballscrews from damage. The MOCON monitors both pump activation and pressure/flow feedback to ensure proper delivery of way oil.
Root Cause Summary
Haas Alarm 75 indicates the automatic lubrication system has failed to maintain proper oil pressure or flow to critical machine components. The NGC control monitors lubrication system pressure through dedicated sensors and will trigger this alarm when pressure drops below minimum thresholds or the lube pump fails to cycle properly.
Safety
Ensure lubrication pump motor is completely stopped before servicing
Wear gloves to prevent skin contact with used mineral oil and grease
Never operate machine without functional lubrication; bearing failure will damage spindle
Causes and Fixes
1
Check lubricant reservoir level
Open electrical cabinet and visually inspect the clear lubricant reservoir tank. Oil level should be between MIN and MAX marks on tank.
Ensure machine is powered off and locked out before opening electrical cabinet
2
Refill with proper lubricant
Add Haas-approved way oil (typically ISO 68 viscosity) to bring level to MAX mark. Use only clean, filtered lubricant to prevent contamination.
Check oil quality - milky or contaminated oil indicates water intrusion or bearing wear
3
Reset alarm and test system
Press RESET to clear Alarm 75, then manually activate lube pump from CURRENT COMMANDS menu to verify proper operation and pressure buildup.
1
Check pump motor operation
Navigate to CURRENT COMMANDS and manually activate LUBE PUMP. Listen for motor operation and observe pressure gauge if equipped.
Do not run pump dry - ensure adequate oil level before testing
2
Verify electrical connections
Check pump motor connections at terminal block in electrical cabinet. Verify 24VDC supply voltage to pump motor using multimeter.
Check fuse F15 (typically 5A) which protects the lube pump circuit
3
Test pump motor resistance
Disconnect pump motor leads and measure resistance across motor terminals. Typical reading should be 8-15 ohms. Infinite resistance indicates open windings.
Ensure power is off and locked out before disconnecting motor leads
4
Replace pump motor if defective
If motor tests bad, replace with Haas OEM pump assembly. Reconnect all wiring and test operation before returning to service.
1
Inspect distribution manifold
Locate the lube distribution manifold (typically mounted on left side of machine base) and check for oil flow at each outlet during pump cycle.
Look for oil weeping or buildup around fittings which indicates blockages upstream
2
Check individual feed lines
Trace each lubrication line from manifold to bearing points on X, Y, Z axes and spindle. Look for kinked, crushed, or disconnected lines.
Use proper PPE when handling lubricants - oil can make surfaces slippery
3
Clear blockages and test flow
Disconnect suspected blocked lines at manifold and blow out with compressed air. Replace any damaged tubing with proper size polyurethane tubing.
Install inline filters in distribution lines to prevent future contamination
1
Locate pressure switch
Find the lube pressure switch mounted on the distribution manifold or pump assembly. It typically has two wire connections and is threaded into the pressure line.
Switch is usually a normally-open type that closes when proper pressure is achieved
2
Test switch operation
With pump running, measure continuity across switch terminals. Switch should close (show continuity) when system reaches operating pressure of 15-25 PSI.
Ensure proper lockout procedures before accessing electrical connections
3
Verify switch settings in parameters
Check Parameter 313 (LUBE MONITOR) is set to 1 if pressure monitoring is enabled. Setting 313 to 0 disables pressure monitoring but should only be temporary.
Parameter 314 sets lube pump cycle time - typical setting is 15-30 minutes
1
Check lubrication parameters
Navigate to SETTING > PARAMETERS and verify Parameter 313 (LUBE MONITOR), Parameter 314 (LUBE TIMER), and Parameter 315 (LUBE ON TIME) settings match machine specifications.
If parameters appear incorrect, restore to factory defaults: P313=1, P314=900, P315=10. These settings provide adequate lubrication for most applications.
Parameter changes require SETTING LOCK CODE - contact supervisor if access is restricted
3
Test automatic cycle operation
Allow machine to run through complete lube cycle automatically. Monitor pump activation timing and verify alarm does not recur during normal operation.
DIY Feasiblehigh confidence
Call a technician if:
·Pump motor replacement required
·Electrical troubleshooting beyond basic checks
·Parameter corruption or control board issues
Prevention
Check lubricant level weekly during daily maintenance
Replace lubricant annually or per maintenance schedule
Keep distribution lines clean and properly routed
Monitor pump cycle timing for consistency
Common Mistakes
Running machine with empty lube tank
Using incorrect viscosity lubricant
Disabling lube monitoring permanently via Parameter 313
Ignoring early signs of pump wear or irregular cycling
