Motor Graders Air Conditioning and HVAC Repairs

HVAC systems on motor graders

Engine-driven compressor, rear condenser, cab evaporator with pressurisation for extended visibility glazing. Very large glass areas create high solar heat load, and haul-road grading places the cab in a constant dust cloud.

Common faults we find on motor graders

• Insufficient cooling at high ambient
• Pressurisation filter saturation
• Blower motor wear
• Refrigerant leaks

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

Short filter intervals, condenser cleaning and verification of cabin pressure to keep dust out of the operator's field of vision.