Preventive Maintenance
must not exceed 6 inches of mercury. At normal
operating speeds (1600-2100 rpm). the fuel pressure is
45 to 70 psi (310-483 kPa). Change the fuel filter
elements whenever the inlet restriction (suction) at the
fuel pump reaches 12 inches of mercury at normal
operating speeds and whenever the fuel pressure at the
inlet manifold falls to 45 psi (310 kPa). Refer to
Table 1.
Item 10
Remove the dirty oil and sludge from the oil bath type
air cleaner cups and center tubes every 8 hours, or less
if operating conditions warrant, Wash the cups and
elements in clean fuel oil and refill the cups to the
level mark with the same grade and viscosity of heavy
duty oil as used in the engine. The frequency of
servicing may be varied to suit local dust conditions.
It is recommended that the body and fixed element in
the heavy-duty oil bath type air cleaner be serviced
every 500 hours. 15,000 miles (24 140 km) or as
conditions warrant.
Clean or replace the element in the dry-type air
cleaner when the restriction indicator instrument
Item 11
indicates high restriction or when a water manometer
reading at the air inlet housing indicates the
maximum allowable air inlet restriction (refer to the
Air Inlet Restriction chart in the Trouble Shooting
section). Refer to the instructions in the Air System
section for servicing the dry-type air cleaner.
Item 10
Item 12
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