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1. Solenoid valve connector
2. Solenoid valve
3. Air tube
4. Pneumatic piston
5. Brake booster
6. Piston
7. Return springs
8. Hydraulic line
9. Hydraulic pressure switch
10. Hydraulic fluid reservoir
11. Switch for the reservoir fluid

Corrective Action:

If air gets into the brake system, the brake does not generate the correct pressure. You must bleed the brake system to remove the air. Use bleed tool T-0062A for EC1600, T-0062 for UMC.

Machines made before November, 2016 may need to reconfigure the reservoir feed hose. Refer to EC-1600, UMC-750 - Hydraulic Brake Booster - Replacement for more information.

Refer to:

• EC-1600 machine: EC-1600 - Rotary Brake - Bleed Instructions

Corrective Action:

The machine monitors a pressure switch to ensure the brake is holding pressure when activated. Do these steps to test the pressure switch.

• Zero return all axes. Push [EMERGENCY STOP].
• Disconnect the sensor cable from the B-Axis booster unit.
• Connect the leads from a digital multimeter to the sensor contacts [1].
• Release the [EMERGENCY STOP].
• Manually activate the solenoid to unclamp the brake.
• The multimeter shows OL (open) when the brake is clamped, and 0.1 to 0.4 Ohms when it is unclamped.
• If there is air in the brake system, the brake does not generate enough pressure to activate the switch. Properly bleed the brake before you replace the switch.

Corrective Action:

Use code M10 and M11  to clamp and unclamp the axis brake. Check for 120 VAC at the solenoid.

If the voltage is present refer to: Solenoid Troubleshooting Guide.

If the voltage is not present refer to:

• I/O PCB - NGC - Troubleshooting Guide
  

Corrective Action:

Use the brake bleed kit (Haas P/N T-0062A for EC-1600, T-0062 for UMC) to check the system pressure. If you cannot build pressure, 400-425 psi (27.6 - 29.3 bar), or, if the pressure drops, the booster may have damaged seals. If the oil level in the reservoir consistently drops, the brake is leaking internally. Refer to UMC-750 - B- and C-Axis Brake Booster - Replacement for more information.

Corrective Action:

Remove the air cylinder from the brake booster body.

Push the air cylinder piston shaft [1] into the retracted position. Remove the rear air fitting.

Use a small diameter rod (.375” (10 mm) or smaller) [2] to push the piston assembly to the extended position.

Use a stone to remove any burrs or high spots on the shaft.

Use your hand to move the shaft back and forth. It should move freely.