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Operating Instructions - Section 30
Page 30-22
RESERVE ENGINE OIL SYSTEM
The reserve oil tank for the engine is designed to add
more oil capacity to the engine and to allow less
frequent servicing of the engine oil. The circulation of
oil between the engine sump and reserve tank
increases the total volume of working oil. This dilutes
the effects of contamination and loss of additives and
maintains the oil quality over longer periods. A filter in
the supply circuit protects the pumping unit and
prevents transfer of contaminants to the engine sump
which might enter the tank during servicing. It also
gives an added level of oil cleanup.
Operation
Engine oil is circulated between the engine sump and
the reserve tank by two electrically driven pumps
within a single pumping unit (11, Figure 30-5). The
pump unit is mounted on the side of the reserve tank,
and is equipped with an LED monitor light on one
side.
Pump 1 (in the pump unit) draws oil from the engine
sump at a preset control point (determined by the
height of the suction tube). Oil above this point is
withdrawn and transferred to reserve tank (9). This
lowers the level in the engine sump until air is drawn.
Air reaching the pumping unit activates pump 2 (in
the pump unit) which returns oil from the reserve tank
and raises the engine sump level until air is no longer
drawn by pump 1. Pump 2 then turns off. The running
level is continuously adjusted at the control point by
alternation between withdrawal and return of oil at the
sump.
LED Monitor Light
• On steadily - Pump 1 is withdrawing oil from the
engine sump and bringing down the oil level.
• Regular pulsing - Pump 2 is returning oil to the
engine sump and raising the oil level.
• Irregular pulsing - Oil is on the correct running
level.
FIGURE 30-5. RESERVE ENGINE OIL SYSTEM
1. Oil Suction
2. Oil Tank Fill
3. Fill Valve
4. Engine Fill Line
5. Oil Level Sensor
6. Air Valve
7. Tank Fill Line
Changing Oil
1. Drain both the engine sump and the reserve
tank. Refill both engine and reserve tank with
new oil to proper levels.
2. Change engine and reserve tank filters as
required.
3. Start engine and check for proper operation.
NOTE: Do not use the oil in the reserve tank to fill the
engine sump. Both must be at proper level before
starting engine.
4. Check the engine oil level with the engine
dipstick at every shift change. If the oil level in
the engine is incorrect, check for proper
operation of the reserve engine oil system.
5. The oil level in the reserve tank must also be
checked at every shift change. Oil must be
visible in middle sight gauge (12). If not, add oil
to the reserve tank by using the quick fill
system. For filling instructions, refer to Section
40, Lubrication and Service.
8/11 OM3062
8. Fill Cap
9. Reserve Oil Tank
10. Engine Fill Line
11. Pump Unit
12. Sight Gauge
13. Tank Return Line
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