Maintenance Inspection Schedule
24
Electrical
•• Check defrost initiation and termination.
•• Check thermostat cycle sequence.
•• Inspect battery terminals and electrolyte level.
•• Check operation of protection shutdown circuits.
•• Inspect electrical contacts for pitting or corrosion.
•• Inspect wire harness for damaged wires or connections.
• Check calibration of return and discharge air sensor, and optional air sensors,
in 32 F (0 C) ice water.
• Check air switch setting.
• Inspect electric motor bearings.*
• Inspect DC (battery charging) alternator bearings* and brushes.
Refrigeration
•• • Check refrigerant level.
•• • Check compressor oil level.
•• •Check suction pressure regulator/throttling valve operation on Defrost or
Heat.
• Check compressor efficiency and pump down refrigeration system.
• Replace dehydrator and compressor oil filter.
• Check discharge and suction pressures.
Structural
•• • Visually inspect unit for fluid leaks (coolant, oil, refrigerant).
•• • Visually inspect unit for damaged, loose or broken parts (includes air ducts
and bulkheads, if so equipped).
•• •Inspect clutch*.
• Inspect idler bearings for leakage and bearing wear.*
• Clean entire unit including condenser and 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).
Pre
trip
750
Hours
1,200
Hours
Annual/
3,000
Hours
Inspect/Service These Items
NOTE: The 1,200 hour maintenance interval may be extended to
2,000 hours or 1 year (whichever occurs first) when equipped with
EMI fuel filter and EMI bypass oil filter.
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