Komatsu 830E-AC Shop Manual page 127

COOLING SYSTEM DESCRIPTION
The standard 830E engine is a Komatsu model
SDA16V160 single stage turbocharged engine
equipped with aftercoolers.
The engine cooling radiator assembly contains two
cores; A "low temperature" core (2, Figure 3-1) is
connected to the four aftercoolers (7). There are two
aftercoolers located on each cylinder bank. This
coolant is circulated by the engine's LTA (Low Tem-
perature Aftercooler) water pump (6). The LTA ther-
mostats (4) begin to open at 46° C (115° F) and are
fully open at 57° C (135° F).
1. Surge/Fill Tank
2. Low Temperature Core (LTA)
3. High Temperature Core
4. Low Temperature Thermostats
C03035
FIGURE 3-1. COOLING SYSTEM DIAGRAM
5. Engine (Hi Temp) Thermostats
6. LTA Circuit Water Pump
7. Aftercooler
8. Engine Oil Coolers
Cooling System
A second, "high temperature" core (3), located at the
rear of the radiator assembly is used for the engine
coolant circuit. In this circuit, the engine water pump
(10) circulates coolant through the engine block (9)
(heads, liners, internal oil coolers etc.). The engine
coolant thermostats (5) begin to open at 82° C (180°
F) and are fully open at 94° C (202° F).
In addition, a fuel cooler, located on the lower right
corner of the radiator assembly reduces fuel temper-
ature after fuel leaves the engine, before it is
returned to the tank. The air conditioning system
refrigerant condenser is mounted on the lower left
corner of the radiator assembly.
9. Engine Block (Heads, Liners)
10. Engine Circuit Water Pump
C3-3