HYDRAULIC SYSTEM
STW34, STW37, STW40, WSM
8-M5
3. HYDRAULIC PUMP
The hydraulic pump is tandem type, front side is the
3P hydraulic pump (3) and rear side is the power
steering hydraulic pump (4). This pump consists of two
pairs of gears, side plates, bushing and other
components as shown in the figure. The hydraulic pump
is driven by the fuel camshaft, and the rotation increase
with the gears in the pump holder (2) by 37/21 times.
The 3P hydraulic pump (3) pressure-feed the oil to
the 3P hydraulic system. The power steering hydraulic
pump (4) pressure-feed the oil to the power steering
controller, bi-speed turn clutch and hydraulic PTO clutch
through the regulator valve (1) and bi-speed valve.
(Reference)
9Y1211109HYM0003US0
Power steering
pump
3P hydraulic pump
Pump discharge per
revolution
6.128 cm
3
/rev.
(0.374 cu.in. /rev.)
10.09 cm
3
/rev.
(0.616 cu.in. /rev.)
Pump discharge per
minute
18.6 L/m
(4.91 U.S.gals/m,
4.09 Imp.gals/m)
(At no load, engine
2700 min
-1
(rpm))
30.6 L/m
(8.08 U.S.gals/m,
6.73 Imp.gals/m)
(At no load, engine
2700 min
-1
(rpm))
(1) Regulator Valve
(2) Pump Holder
(3) 3P Hydraulic Pump
(4) Power Steering Hydraulic
Pump
(5) Driven Gear 1
(6) Bushing
(7) Bushing
(8) Driven Gear 2
(9) Drive Gear 2
(10) Side Plate
(11) Drive Gear 1
a: From Transmission Case
b: To Regulator Valve
c: To 3P Hydraulic System
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