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 TM 5-2010-205-14
b. The pump can put more oil into the system than needed. The oil that is not needed bypasses the system through
a relief valve.
1-18. COOLING SYSTEM. The water pump is installed on the front cover of the engine and is driven by V-belt from the
crank shaft pulley. As the coolant goes from the water pump, it divides and goes through the inside passages in the front
cover of the engine to the cylinder block and up to the cylinder heads. From the cylinder heads, the coolant goes forward
through orifices to the front cover of the engine. Part of the coolant on the left side of the cylinder block goes to the
cooler for engine oil. The remainder goes to the bottom left opening in the water cooled turbocharger. Coolant leaves
the turbocharger from two lines at the top and goes to the watercooled turbocharger support. The coolant then goes to
the front cover of the engine. From the front cover of the engine, the coolant either goes to the inlet for the water pump
or to the expansion tank. If the coolant is cold (cool), the water temperature regulators will be open.
1-19. ELECTRICAL SYSTEM. The electrical system has three (3) separate circuits: the charging circuit, the starting
circuit and the low amperage circuit. Some of the electrical system components are used in more than one circuit. The
batteries, circuit breaker, ammeter, cables and wires from the battery are all common in each of the circuits.
a. The charging circuit is in operation when the engine is running. An alternator makes electricity for the charging
circuit. A voltage regulator in the circuit controls the electrical output to keep the battery at full charge.
b. The starter circuit is in operation only when the start switch is activated.
c. The low amperage circuit and the charging circuit are both connected to the same side of the ammeter. The
starting circuit connects to the opposite side of the ammeter.
1-20. MAIN HYDRAULIC PUMP.
a. The axial piston pump features advanced design concepts providing smooth controlled power in a compact
package. The axial piston pump uses a rocker cam and cradle stroking control to vary displacement. A vane actuator
with a rotary servo operates the stroking control thus varying flow. A double geroter pump mounted in the main port-
block provides independent servo and replenishing flow in the closed loop. The basic pump includes a rotary servo input
control and compensator override.
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