To drain refrigerant, specifically Freon, from a 2005 Kobelco SK160 excavator’s air conditioning system, adhere strictly to environmental regulations and safety protocols. This procedure mandates certification under relevant authorities, such as EPA Section 608 in the United States, due to the hazardous nature of refrigerants. Unauthorized handling is illegal and environmentally detrimental.
(how to drain freon from a 2005 kobelco sk160 excavator)
Prerequisites:
1. Personal Protective Equipment (PPE): Wear safety goggles and chemical-resistant gloves.
2. Equipment: EPA-certified refrigerant recovery machine, calibrated manifold gauge set, refrigerant identifier, recovery cylinder (rated for R-134a), and vacuum-rated hoses. Verify cylinder service valves are closed before connection.
3. Workspace: Park the excavator on level ground, engage the parking brake, and disconnect the battery. Allow the system to stabilize for 30 minutes to equalize pressure.
Procedure:
1. Locate Service Ports: Identify the low-pressure (suction) and high-pressure (discharge) service ports. The low-pressure port (typically larger, 1/4″ SAE) is near the compressor; the high-pressure port (smaller, 3/16″ SAE) is on the liquid line. Clean ports to prevent contamination.
2. Refrigerant Identification: Connect the identifier to the low-pressure port. Confirm the refrigerant type is R-134a. If contaminants are detected, specialized recovery procedures apply.
3. Machine Setup:
– Connect the blue manifold hose to the low-pressure port.
– Connect the red manifold hose to the high-pressure port.
– Attach the yellow hose to the recovery machine’s inlet.
– Link the recovery machine’s outlet to the recovery cylinder.
4. Recovery Execution:
– Open the recovery cylinder’s service valve.
– Power on the recovery machine. Select “Recover” mode.
– Gradually open the manifold’s low-pressure valve, then the high-pressure valve. Monitor pressure gauges: Initial suction pressure should not exceed 550 kPa.
– The machine will extract refrigerant until reaching a vacuum of -15 inHg. Maintain vacuum for 5 minutes to ensure complete recovery.
– Close manifold valves first, then shut off the recovery machine. Seal the cylinder valve immediately.
5. Disconnection & Verification:
– Disconnect hoses, capping service ports and hoses to prevent moisture ingress.
– Weigh the cylinder. Subtract tare weight to determine recovered volume. Cross-reference with the SK160’s factory charge (typically 700–900 grams).
– Document volume, date, and technician credentials for compliance.
Post-Procedure:
– Label the recovery cylinder with refrigerant type and weight. Store in a ventilated, upright position.
– If reopening the system, evacuate it to 500 microns before recharging.
– Dispose of refrigerant via licensed reclaimers only.
Critical Considerations:
– Safety: Avoid skin contact with refrigerant; it can cause frostbite. Never operate recovery equipment near ignition sources.
– Compliance: Improper disposal incurs significant penalties. Recovery equipment must undergo annual calibration.
– Technical Note: The SK160’s parallel-flow condenser may retain residual oil. If system contamination is suspected, flush components per OEM guidelines.
(how to drain freon from a 2005 kobelco sk160 excavator)
This process ensures environmentally responsible refrigerant management. Always consult Kobelco’s service manual and local regulations prior to execution.