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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 minutes
Check belt tension
(80-100) lbs; V-belt
Inspect shaft seal 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 or damage
3. Receiver-Drier
Check inlet line from
condenser (should be hot to
touch)
Replace, if system is opened
4. Accumulator
Check the inlet line from the
evaporator. It should be cool
to cold.
Replace the accumulator
each time the system is
opened.
N04031 10/06
Maintenance Interval
(months)
3
6
12
Done
Operator Comfort
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
5. Expansion Valve
Inspect capillary tube (if
used) for leakage, damage,
looseness
6. Evaporator
Clean dirt, bugs, leaves, etc.
from fins (w/ compressed air)
Check solder joints on inlet/
outlet tubes (leakage)
Inspect condensation drain
7. 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 connections
Operate all manual controls
through full functions
Maintenance Interval
(months)
3
6
12
Done
X
N4-45
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