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OM-2031
(b) Oil pressure switch
A diaphragm-type switch monitors the pressure in the lubricating oil system. It is mounted
in the side of the cylinder block (18, Fig. 3) . If the pressure in the lube oil system falls to
10 psi (69 kPa) , this switch opens and actuates the fuel valve solenoid which shuts down
the engine.
(4) Air cleaner
The diesel-engine air cleaner (Fig. 4) is a dry-cartridge type. It is equipped with a moisture
eliminator and a service indicator. The indicator functions to signal the operator when the car-
tridge needs changing. A red cylindrical "flag" (2) is forced upward in a glass enclosed view-
ing chamber (1) when air pressure within the air cleaner housing drops below the outside air
pressure. As the cartridge becomes loaded with dirt and air pressure within the cleaner less-
ens, the "flag" gradually rises higher in the glass viewing chamber. When the "flag" reaches
the top of the chamber, it locks in that position to warn the operator that the cartridge must be
changed. The "flag" is reset (unlocked) by pushing the reset button (3) located on the bottom
of the indicator.
NOTE: The service indicator is mounted on the engine control panel and connected to the air cleaner
by a rubber hose. The indicator flag is visible only when the engine is running, or when the flag is
locked in WARNING position.
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April 30/96 Revised
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