Mobile Cranes Air Conditioning and HVAC Repairs

HVAC systems on mobile cranes

Separate cooling for the carrier and superstructure cabs, each with its own condenser, evaporator and controls. Two independent systems, long line runs into the superstructure and high glazing loads in the operator cab.

Common faults we find on mobile cranes

• Leaks in superstructure lines
• One cab cooling while the other does not
• Condenser fouling
• Electrical faults through slip rings and connectors

Diagnostic process

• Operator interview and fault confirmation with the machine running under load
• Visual inspection of condenser, belts, hoses, wiring and cabin filters
• High and low side pressure testing against the manufacturer's specification
• Electronic leak detection, dye tracing or nitrogen pressure testing where required
• Electrical fault finding on clutches, relays, pressure switches and control modules
• Written findings, parts list and repair recommendation before work proceeds

Repair approach

• Correct recovery of refrigerant before any component is opened
• Compressor, condenser, evaporator, drier, valve, blower and harness repairs or replacement
• System flushing and drier replacement after contamination or compressor failure
• Vacuum, leak hold test, charge by weight and oil balance to specification
• Function test across the full temperature range with cabin outlet readings recorded

Preventative maintenance recommendations

Test both systems separately at every service and inspect line routing into the superstructure.