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Structural Maintenance
Unit and Engine Mounting Bolts
Periodically check and tighten all unit and engine
mounting bolts. Torque the unit mounting
bolts to 60 ft-lb (81.3 N•m). Torque the engine
mounting bolts to 50 ft-lb (68 N•m).
Figure 182: Mounting Bolts
Unit Inspection
Inspect the unit during unit pretrip inspection and
scheduled maintenance inspections for loose or
broken wires or hardware, compressor oil leaks,
or other physical damage which might affect unit
performance and require repair or replacement of
parts.
Condenser and Radiator Coils
Clean the coils during scheduled maintenance
inspections. Remove any debris (e.g., leaves or
plastic wrap) that reduces the air flow. Clean dirty
coils with compressed air or a pressure washer. Be
careful not to bend the fins when cleaning a coil.
If possible, blow the air or water through the coil
in the direction opposite the normal air flow.
Repair bent fins and any other noticeable damage.
Fan Location
When mounting the fan and hub assembly on the
fanshaft, position the assembly in the orifice as
follows for proper fan performance:
• For all fans except the ten-blade condenser
fan, position the fan with 30 to 35 percent of
the blade width to the air discharge side.
• For the ten-blade condenser fan, position the
fan with 50 percent of the blade width to the
air discharge side.
Figure 183: Fan Blade Position in Orifice
for All Except Ten-Blade Fan
Figure 184: Fan Blade Position in Orifice
for Ten-Blade Fan
CAUTION: Air pressure should not be
high enough to damage coil fins.
ORIFICE
AIR
FLOW
50 Percent
of Blade Depth to
Air Discharge Side
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