TROUBLESHOOTING
Symptom
Problem
Solution
Section
Compressor clutch slipping
Remove clutch assembly for service
or replacement.
Thermostat defective or
improperly adjusted
Replace thermostat.
Contact Dealer
Clogged air
fi
lters
Remove air
fi
lters, and clean or
replace as necessary.
Cleaning Engine
Air Filter Primary
Element, page
343
and
Cleaning
Return Air Cleaner,
page 328
Heater circuit is open
Close temperature control in cab,
and valve on engine).
3.10.3 Climate
Controls, page 57
and
3.10.1 Heater
Shut-Off, page 56
Insuf
fi
cient air circulation over
condenser coil;
fi
ns clogged
with dirt or insects
Clean condenser.
Air Conditioning
Condenser, page
329
Evaporator
fi
ns clogged
Clean evaporator
fi
ns (under cab
fl
oor).
Cleaning Air
Conditioning (A/C)
Evaporator Core,
page 329
Refrigerant low
Clogged expansion valve
Clogged receiver-drier
Excessive moisture in system
Air in system
Air conditioning
not producing
suf
fi
cient cooling.
(suf
fi
cient cooling
de
fi
ned as when
air temperature
in cab, measured
at louvered vent,
can be maintained
at 25°F [14°C]
below ambient air
temperature.)
Blower motor sluggish in
operation
Contact Dealer.
Contact Dealer
Unit icing up due to thermostat
adjusted too low
Adjust thermostat.
Unit icing up due to excessive
moisture in system
Unit icing up due to incorrect
super-heat adjustment in the
expansion valve
Thermostat defective
Defective blower switch or
blower motor
Partially open, improper
ground or loose connection in
compressor clutch coil
Air Conditioning
Cools
Intermittently
Compressor clutch slipping
Contact Dealer.
Contact Dealer
147649
444
Revision A
Summary of Contents for M155
Page 3: ...Declaration of Conformity Figure 1 Declaration of Conformity Page 1 of 2 147649 i Revision A ...
Page 4: ...Figure 2 Declaration of Conformity Page 2 of 2 147649 ii Revision A ...
Page 30: ...SAFETY Figure 1 21 Safety Signs Left Cab forward Side 147649 14 Revision A ...
Page 32: ...SAFETY Figure 1 23 Safety Signs Right Cab forward Side 147649 16 Revision A ...
Page 44: ......
Page 54: ......
Page 320: ......
Page 414: ...MAINTENANCE AND SERVICING Fuse Box Decal Figure 5 178 Fuse Decal 147649 398 Revision A ...
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