Maintenance Inspection Schedule
26
Electrical
• Check controller for alarms.
• Run pretrip test
• Check battery voltage screen.
• Inspect battery terminals and electrolyte level.
• Inspect electrical contacts for pitting or corrosion.
• Inspect wire harness for damaged wires or connections.
• Check calibration of return and discharge air sensors in 32 F (0 C)
ice water.
• Inspect alternator bearings and brushes*.
• Inspect electric motor bearings* (Model 50).
*With Belt removed, spin bearings by hand. Listen for noise (bearings roll freely).
Refrigeration
• • Check refrigerant level.
• Check compressor oil level.
• Check throttling valve setting on Defrost or Heat.
• Check discharge and suction pressures.
• Check compressor efficiency.
— Replace dehydrator and compressor oil filter every two (2) years.
Structural
• • Visually inspect unit for fluid leaks.
• • Visually inspect unit for damaged, loose or broken parts (includes air
ducts and bulkheads).
• • Inspect clutch for shoe and anchor bushing wear with a mirror. Check
bearings.*
• Inspect idlers for leakage and bearing wear.*
• Clean entire unit including condenser coils, evaporator coils, and
defrost drains.
• • • Check all unit, fuel tank, engine, and electric motor mounting bolts,
brackets, lines, hoses, etc.
*With belt removed, spin bearings by hand. Listen for noise (bearings roll freely). Up to 1/8” axial play (wobble) in either
direction is normal for composite idlers.
Pretrip 1,200
Hours
2,000
Hours
Annual/
3,000
Hours
Inspect/Service These Items
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