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Check Hydraulic Reservoir Level

Open electrical cabinet and visually inspect hydraulic tank fluid level through sight gauge. Level should be between MIN and MAX marks.

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

Add Hydraulic Fluid if Low

If below minimum, add ISO 32 hydraulic fluid (Haas P/N 93-32-5050) through reservoir fill cap. Fill to MAX line on sight gauge.

Use only Haas-approved hydraulic fluid to prevent seal damage and maintain warranty

Check for External Leaks

Inspect hydraulic lines, fittings, and reservoir for visible fluid leaks. Look for wet spots or fluid accumulation around hydraulic components.

Clean area first, then run machine briefly to identify active leak sources

Cycle System and Monitor

Power on machine and observe pressure gauge during startup. Pressure should build to 500-800 PSI within 30 seconds of pump activation.

Verify Pump Motor Operation

Listen for pump motor startup when powering on machine. Motor should start immediately and run continuously during initial pressure buildup.

Do not attempt electrical testing without proper lockout/tagout procedures

Check Motor Electrical Connections

Inspect pump motor contactor (typically K7) in electrical cabinet for proper contact closure and burned contacts. Verify 3-phase power to motor terminals.

Use thermal imaging to detect overheating contactors or loose connections

Test Motor Amperage Draw

Measure motor current draw during operation. Compare to nameplate amperage. Low amperage may indicate mechanical pump failure.

Normal pump motor draw is typically 8-12 amps on 3-phase systems

Verify Pump Coupling

Check coupling between motor and hydraulic pump for damage or disconnection. Coupling should transfer full motor torque to pump.

Locate Hydraulic Return Filter

Find return filter assembly in hydraulic tank (typically mounted on tank top or side). Filter housing contains replaceable cartridge element.

System must be depressurized before removing filter elements

Check Filter Bypass Indicator

Inspect filter bypass indicator (red button) on filter housing. If extended, filter is clogged and bypassing unfiltered fluid.

Bypass indicator extends when differential pressure exceeds 25 PSI across filter

Replace Filter Element

Remove filter housing cover and replace cartridge with Haas P/N 93-32-1010 or equivalent 10-micron element. Clean housing before reassembly.

Replace filter every 2000 hours or annually, whichever comes first

Reset System and Test

Refill system if needed, power on machine, and verify pressure builds normally. Bypass indicator should retract within first few minutes of operation.

Locate Pressure Switch

Find hydraulic pressure switch mounted on main hydraulic manifold. Switch has electrical connection and pressure port threaded into manifold.

Pressure switch is typically set to close at 300-400 PSI and open at 200-250 PSI

Test Switch Continuity

With system pressurized, measure continuity across switch terminals. Switch should show closed circuit (0 ohms) when pressure is adequate.

Verify system pressure with separate gauge before testing switch

Check NGC Input Status

Access CURRENT COMMANDS screen and verify hydraulic pressure input shows active status when system is pressurized.

Input typically shows as 'HYD PRESS OK' or similar designation in current commands display

Replace Pressure Switch

If switch fails continuity test, replace with Haas P/N 93-32-2020 or equivalent. Apply thread sealant to pressure port threads.

Calibrate new switch to close at 350 PSI using adjustment screw if adjustable type

Monitor Pressure Decay

With pump stopped, observe how quickly system pressure drops. Rapid pressure loss indicates significant internal leakage in cylinders or valves.

Normal system should hold pressure for several minutes after pump stops

Isolate Hydraulic Circuits

If equipped with isolation valves, close individual circuit valves to isolate tool changer, spindle brake, and axis systems to identify leaking circuit.

Do not operate machine functions with hydraulic circuits isolated

Inspect Cylinder Seals

Check hydraulic cylinders for external fluid leakage around rod seals and end caps. Internal seal failure may not show external signs.

Cylinder drift during operation often indicates internal seal failure

Contact Haas Service

Internal hydraulic repairs require specialized tools and knowledge. Schedule service call for cylinder rebuild or valve replacement.

Document which circuits hold pressure to help technician isolate problem quickly