Komatsu 830E-AC Shop Manual page 50

RESERVE ENGINE OIL SYSTEM (Optional)
The reserve oil tank for the engine is designed to add
more oil capacity to the engine and to make less fre-
quent 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 30-2). 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 with-
drawn and transferred to reserve tank (9). This low-
ers 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
• Steady - 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 operat-
ing level.
Changing Oil
1. Drain both the engine sump and the reserve
tank. Refill both the engine and reserve tank
with new oil to proper levels.
2. Change engine and reserve tank filters as
required.
3. Start the engine and check for proper operation.
A3-36
NOTE: Do not use the oil in the reserve tank to fill the
engine sump. Both must be at proper level before
starting the engine.
General Safety and Operating Instructions
4. The engine oil level must be checked 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.
The oil level in the reserve tank must also be
checked at every shift change. Oil must be visi-
ble in middle sight gauge (12). If not, add oil to
the reserve tank by using the quick fill system
utilizing tank fill valve (3). For filling instructions,
refer to Section 40, Lubrication and Service.
FIGURE 30-2. 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
8. Fill Cap
9. Reserve Oil Tank
10. Engine Fill Line
11. Pump Unit
12. Sight Gauge
13. Tank Return Line
3/06 A03030