Komatsu 830E-AC Shop Manual page 892

Operation
Engine oil is circulated between engine oil pan (1,
Figure 31-2) and reserve tank (2) by two electrically
driven pumps (pump 1 and pump 2) within a single
pumping unit (4). The pumping unit is mounted on
the side of the reserve tank. The pump unit is
equipped with an LED monitor light on one side.
Pump 1 draws oil from the engine oil pan (1) at a
preset control point determined by the height of the
suction tube (6). Oil above this point is withdrawn
and transferred to the reserve tank. This lowers the
level in the engine oil pan until air is drawn.
Air reaching the pumping unit activates pump 2,
which returns oil from reserve tank (2) and raises
the engine oil 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 alter-
nating between withdrawal and return of oil at the
engine oil pan. The oil returning to the engine oil
pan is below the normal operating level to prevent
aeration of the oil.
1. Engine Oil Pan (Sump)
2. Oil Tank
3. Oil Filter
M31-4
FIGURE 31-2. RESERVE SYSTEM SCHEMATIC
4. Pumping Unit (1 & 2)
5. Air Relief Valve
6. Suction Tube
Reserve Engine Oil System
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 at the correct running
level.
A. Oil Suction Line
B. Oil Return Line
C. Engine Oil Level
M31004