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SYSTEMS OPERATION
The hydraulic control consists essentially of suc
tion strainer 1, gear pump 2, main reliefyalve 3,
oil cooler 13, oil filter 14, lubrication relief valve
15, control valve and steering clutch hydraulic
Control.
Suction strainer 1 is a 100-mesh stainless type
element with a magnet and serves to protect gear
pump 2.
Gearpump 2is ofexternal gear tpnd is driven
by the gear to which drive is transmitted from the
transmission input shaft.
Oil cooler 13 is of multi-plate type and. is built in
the lower tank of the radiator.
Oil filler 14 is of cartridge type. It opens its
bypass circuit when its element is clogged and
the pressure difference across it exceeds 1.0
kgf/cm2 (14 psi) [0.1 MPaJ to maintain constant
flow of oil to the lubrication circuit.
Lubrication relief -valve 15 maintains the oil
pressure in the lubrication circuit at 1 to 2
kgf/cm2 (14 to 28 psi) [0.1 to 0.2 MPaJ for
protection.
The oil in the oil sump is lifted by gear pump 2
through Suction strainer 1. Oil from the pump
flows into two circuits, oneleadingto the steering
valve for actuating the steering clutches and the
other to main relief valve 3 for actuating the
clutch pistons of planetary gears.
After delivering the main pressure, the excess oil
is cooled by oil cooler 13, flows through oil filter
14, lubricates planetary gears and transmission
parts,
and gravity-returns to the oil sump for
recjrculatjon.
1
Suction strainer
2
Gear
pump
3 Main relief valve
13 Oil cooler
14 Oil
filter
16 Steering valve
17 Steering clutch cylinders
18 Oil cooler hoses
21
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