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System Will Not Produce Sufficient Cooling
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Air conditioner switch off
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Turn air conditioner on (press top of switch).
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Compressor not functioning (both the large and small air-conditioning hoses, exiting right-hand rear corner of cab, are at the same temperature)
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See your John Deere dealer.
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Temperature control cable not functioning
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Remove tray behind passenger seat. If water valve arm does not move with temperature control adjustment, check for correct cable attachment at temperature control and valve arm.
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High-pressure switch on. Insufficient air flow across condenser
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Clean condenser. Check rotary wand function.
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See your John Deere dealer.
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Low-pressure switch on. Insufficient air flow across evaporator
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Clean filters. Check cab fan operation.
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See your John Deere dealer.
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Low-pressure switch on. Low outside air temperature
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Move temperature control to warmer setting.
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Low-pressure switch on. Insufficient refrigerant level (bubbles in sight glass)
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See your John Deere dealer.
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Heater valve partially on (with temperature knob set for maximum cooling, feel both heater hoses exiting right-hand rear corner of cab. If both are warm, valve is open)
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Adjust control cable through tray opening.
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Insufficient blower speed
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Increase blower speed.
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Debris on radiator screen
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Clean screen.
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Compressor clutch not engaging
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See your John Deere dealer.
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OME,4890,095,B -19-06FEB97-1/5
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| Symptom |
Problem |
Solution |
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Condenser is overheating
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Clean screens, cores and fins of condenser, oil cooler, and radiator.
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Burned out clutch field or faulty field
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See your John Deere dealer.
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Faulty high pressure or low pressure switches
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Replace switches.
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Faulty thermostat
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Replace thermostat.
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Recirculating fan disconnected
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Check connectors at fan switch.
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Compressor partially or completely seized
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Remove compressor for service or replacement.
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Dirty filters
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Clean filters.
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Broken or disconnected electrical wire
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Check all terminals for loose connections; check wiring for hidden breaks.
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Broken or disconnected cab ground wire
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Check ground wire to see if loose, broken, or disconnected.
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Expansion valve stuck in open position
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Replace expansion valve.
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Expansion valve stuck shut
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Replace expansion valve.
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Broken refrigerant line
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Examine all lines for evidence of breakage by external stress of rubbing wear.
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Leak in system
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Evacuate system, apply static charge, leak test system, and repair leak as necessary.
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Restriction in refrigerant system
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Check for kinked hoses.
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Restriction in receiver/dryer
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See your John Deere dealer.
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Restriction in expansion valve
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See your John Deere dealer.
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Compressor shaft seal leaking
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Replace the compressor shaft seal.
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Excessive moisture in system, causing expansion valve freeze up
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Drain and recharge. Replace receiver-dryer.
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OME,4890,095,B -19-06FEB97-2/5
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| Symptom |
Problem |
Solution |
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Clogged cab roof inlet panel
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Remove and clean.
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Evaporator fins clogged
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Blow out condenser fins with compressed air.
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Too little refrigerant in system
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Recharge system.
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Clogged screen in receiver-dryer
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Discharge system, replace receiver-dryer. Then evacuate and charge system.
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Excessive moisture in system
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Discharge system; replace receiver-dryer. The evacuate and charge system.
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Air in system
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Discharge, evacuate, and charge system.
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Hissing Noise At Expansion Valve
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Loss of refrigerant
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Check sight glass for bubbles and system for leaks. See your John Deere dealer.
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Restriction in refrigerant system
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Check for kinks in hoses.
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Check receiver-dryer for uniformity of temperature. If temperature is not uniform, see your John Deere dealer.
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Partial Frosting and Sweating of Lines Combined With Poor Cooling
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Loss of refrigerant
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Check sight glass for bubbles and system for leaks. See your John Deere dealer.
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Restricted or clogged liquid line
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See your John Deere dealer.
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Expansion valve malfunctioning
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See your John Deere dealer.
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OME,4890,095,B -19-06FEB97-3/5
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| Symptom |
Problem |
Solution |
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Air Conditioning System Too Noisy
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Loose or excessively worn drive belt.
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Tighten or replace as necessary.
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Noisy clutch
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Remove clutch for service or replacement as necessary.
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Compressor noisy
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Check mountings and repair; remove compressor for service or replacement.
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Excessive charge in system
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Discharge excess refrigerant until high-pressure gauge drops within specifications.
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Low charge in system
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Check system for leaks; charge system.
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Excessive moisture in system
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Replace receiver-dryer; evacuate and charge system.
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Air Conditioning System Cools Intermittently
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Compressor clutch slipping
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Slippage over a prolonged period will require that clutch be removed for service; may require adjustment for proper spacing.
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Unit icing up may be caused by excessive moisture in system, inoperative expansion valve, or faulty thermostat
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Replace expansion valve; replace receiver-dryer if excess moisture is present; replace thermostat.
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Thermostat defective
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Replace thermostat.
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Defective blower switch or blower motor
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Remove defective part for service or replacement.
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Partially open, improper ground, or loose connection in compressor clutch coil or solenoid
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Check connections or remove clutch coil or solenoid for service or replacement.
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Compressor clutch cycles excessively or compressor stays off up to 15 minutes
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Evaporator icing
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Adjust controls correctly. (See Operator's Station section.) Open louvers. Clean filters. Move knob to warmer setting.
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OME,4890,095,B -19-06FEB97-4/5
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| Symptom |
Problem |
Solution |
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Bad smell (foul odor) in cab
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Plugged drain tube. Dirty filters. Dirty cab
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Blow out condensate tube. Clean filters. Vacuum out cab.
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Be certain weep valve in condensate drain tube is installed.
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OME,4890,095,B -19-06FEB97-5/5
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