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Preventive Maintenance Schedule for A/C System
Truck Serial Number: ____________________________
Site Unit Number: ______________________________
Date:______________Hour Meter:_________________
COMPONENT
1. COMPRESSOR
Check noise level
Check clutch pulley
Check oil level
Run system 5 min.
Check belt tension
(80 - 100 lbs; V-belt)
Inspect shaft seal
(leakage)
Check mounting
bracket (tighten bolts)
Check alignment of
clutch w/crankshaft
pulley (within 0.06 in.)
Perform manifold
gauge check
Verify clutch is
engaging
2. CONDENSER
Clean dirt, bugs,
leaves, etc. from coils
(w/compressed air)
Verify engine fan
clutch is engaging (if
installed)
Check inlet/outlet for
obstructions/damage
3. RECEIVER - DRIER
Check inlet line from
condenser (should be
hot to touch)
Replace if system is
opened
M09010 6/97
Maintenance Interval
(months)
3
6
12
Done
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Air Conditioning System
for HFC 134a Refrigerant
Last Maintenance Check:________________________
Name of Service per-
NOTE: Compressor should be run at least 5 minutes
(40°F minimum ambient temperature) every month, in
order to circulate oil and lubricate components.
COMPONENT
4. EXPANSION VALVE
Inspect capillary tube
(if used) (leakage/dam-
age/
looseness)
5. EVAPORATOR
Clean dirt, bugs,
leaves, etc. from fins
(w/compressed air)
Check solder joints on
inlet/outlet tubes (leak-
age)
Inspect condensate
drain
6. OTHER Components
Check discharge lines
(hot to touch)
Check suction lines
(cold to touch)
Inspect fittings/clamps
& hoses
Check thermostatic
switch for proper op-
eration
Outlets in cab: 40°F to
50°F temperature
(HMS trucks: 25°F to
35°F below ambient)
Inspect all wiring
connections
Operate all manual
controls through full
functions
Maintenance Interval
(months)
3
6
12
Done
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M9-27
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Troubleshooting
