Operation and maintenance manual

Section 260-0130

SM 1405 Rev 2 11-04

Operators Compartment - Air Conditioning

AIR CONDITIONING DIAGNOSIS (CONT.)

CONDITION PROBLEM REMEDY

3. Noise - Evaporator

Rubbing/scraping Fan blade or blower Repair or replace

Hissing Low charge/leak Correct charge/repair leak

Chatter/knocking Expansion valve Replace

Noisy case Loose brackets/screws Tighten

Motor squeal Dry bearings Replace

4. Air Conditiong Inadequate

After Short Period of Operation

Cooling quits Loss of refrigerant Charge system/check for leaks

Moisture in system Replace drier

Thermostat Replace thermostat

Clutch Check pull-in of clutch or replace

Cooling intermittent Moisture in system Replace drier

5. Electrical Trouble

Blower motor or condenser fan Defective circuit breaker or bad Replace. Clean and tighten

motor inoperable wiring connections connections

Tight motor bearing Repair or replace motor

Switch open or shorted Repair or replace switch

Slow running blower Shaft binding Replace motor - worn bearings

Wheel misaligned Replace

Bad blower switch Replace blower

Insufficient current Install larger alternator

Clutch inoperable Defective circuit breaker Replace

Loose connection Clean and tighten connection

Broken wire - ground Repair wire

Shorted or open field Replace field