Specifications

33
3. Hydraulic drive unit
Torque converter
Type
Three elements, single stage, two phases
Torque ratio
3
Set pressure
0.5～0.68 MPa
Charging pump
Type
Inner-mesh gear pump
Flow rate
27 L/min(2000rpm,1.5MPa)
Hydraulic
transmission
Type
Power shifted
Speed ration
(FWD/BWD)
1.35/1.35
Hydraulic
clutch
Friction piece:
O.D.×I.D.×T.
Ф125×Ф80×2.7 (mm)
Friction area
71cm
2
Set pressure
1.1～1.4 MPa
Weight
165kg
Oil amount
7 L
Oil type
6# or 8# Torque converter oil
3.1 General description (Fig3.1)
The hydraulic transmission case used in the hydraulic drive type truck is
consisted of a torque converter and a power gear-shifting transmission.
(1) With an inching valve, the inching operation can be done under the condition
that the engine runs at both high and low speed.
(2) Each of two hydraulic clutches is provided with three pairs of steel plates and
high quality friction pieces specially-treated, so as to improve the durability of friction
surface.
(3) One-way clutches in the torque converter are used to increase the efficiency
for power transmission.
(4) High quality oil filters is helpful to prolong the life of the torque converter.