M09010 05/02 Air Conditioning System M9-35
for HFC 134a Refrigerant
Preventive Maintenance Schedule for AC System
Truck Serial Number___________________________
Site Unit Number______________________________
Date:____________Hour Meter:_________________
Last Maintenance Check:_______________________
Name of Service Technician________________
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
Maintenance Interval
(months)
3 6 12 Done
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 sea for leakage
Check mounting bracket
(tighten bolts)
Check clutch alignment 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 con-
denser (should be hot to
touch)
Replace if system is opened
COMPONENT
Maintenance Interval
(months)
3 6 12 Done
4. Expansion Valve
Inspect capillary tube (if
used) (leakage, damage,
looseness)
X
5. Evaporator
Clean dirt, bugs, leaves, etc.
from fins (w/ compressed
air)
Check solder joints on inlet/
outlet tubes (leakage)
Inspect condensation 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 operation
Outlets in cab: 40°F to 50° F
Inspect all wiring connec-
tions
Operate all manual controls
through full functions
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