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Check hydraulic reservoir level

Verify hydraulic fluid level is between MIN and MAX marks on reservoir sight gauge. Fluid should be ISO 32 hydraulic oil or Haas-approved equivalent.

Machine must be powered off and pressure relieved before checking fluid level

Inspect for external leaks

Check all hydraulic lines, fittings, and cylinder seals for visible leaks. Pay special attention to chuck actuator cylinders and rotary union connections.

Use cardboard under suspected leak areas to identify exact leak location

Bleed air from system

If air is present, cycle hydraulic functions manually using MDI mode with M10/M11 commands while monitoring pressure gauge to purge air bubbles.

Run several cycles of chuck open/close to help expel trapped air

Check pump motor operation

Listen for pump motor operation during startup sequence. Motor should run for 10-15 seconds to build initial pressure then cycle as needed.

Do not attempt electrical measurements on pump motor without proper lockout/tagout procedures

Verify pump coupling integrity

Remove pump motor cover and inspect flexible coupling between motor and pump for cracks, separation, or complete failure.

Coupling failure often leaves rubber debris around pump housing

Test motor electrical supply

Using multimeter, verify 220V supply to pump motor terminals and check motor windings for continuity and proper resistance values.

Electrical testing must be performed by qualified personnel only

Inspect hydraulic filter condition

Remove and examine hydraulic return filter for contamination, metal particles, or complete blockage. Filter should be changed every 2000 hours or annually.

Dark, thick oil or metal particles in filter indicate internal component wear

Check return line flow

Disconnect return line at reservoir and verify unrestricted flow when system is cycled. Look for kinked or collapsed return hoses.

Contain hydraulic fluid spillage and dispose of properly per local regulations

Replace filter and fluid if contaminated

Install new hydraulic filter and replace fluid if contamination is found. Use only Haas-approved ISO 32 hydraulic fluid.

Always prime new filter with clean fluid before installation to prevent air introduction

Test pressure switch continuity

Using multimeter, check pressure switch contacts for proper operation. Switch should be closed (continuity) when system pressure exceeds setpoint.

Verify system is depressurized before disconnecting pressure switch

Verify switch wiring to control

Check wiring from pressure switch to NGC control input terminal. Verify connections are tight and wires show no damage or corrosion.

Pressure switch typically connects to 24V input on main control board

Calibrate or replace pressure switch

If switch tests faulty, replace with identical Haas part number. Adjust setpoint to 800-900 PSI using built-in adjustment screw if applicable.

New pressure switches may require initial calibration using known good pressure source

Locate and inspect relief valve

Find hydraulic pressure relief valve (typically mounted on pump or manifold block) and check for external leakage or damage to adjustment mechanism.

Relief valve is usually the component with the largest adjustment screw on the hydraulic manifold

Attempt valve cleaning

Carefully remove relief valve cartridge and clean with appropriate solvent. Check spring and poppet for wear or damage.

System must be completely depressurized before removing relief valve components

Test and adjust relief valve setting

Reinstall valve and gradually increase pressure setting while monitoring system pressure. Relief should crack at 1200-1500 PSI depending on machine model.

Make small adjustments (1/8 turn) and test pressure after each adjustment