Takeuchi TB215R Workshop Manual

FUNCTION
HYDRAULIC PUMP (PISTON)
2
3
HYDRAULIC PUMP (PISTON) 3I0AX00
If the discharge pressure becomes higher than the pre-
set value for the spring (7), the angle of inclination of the
swash plate (4) becomes smaller due to the net force on
the piston, F1 × a, and the force, F2, of the piston (9),
which allows the plate to be retained at the position at
which the discharge pressure and the spring force are
balanced.
If the discharge pressure increases further, the angle of
inclination of the swash plate (4) decreases further. At
this time, the arm length, a, which is determined by the
action of the net force on the piston, F1, becomes small-
er, represented by a', resulting in a larger force F1 being
needed to act against the inclination of the swash plate.
In this way, the angle of inclination of the swash plate (4)
is changed and the discharge volume is controlled. This
allows the pump to supply only the pressure and flow re-
quired for the load so as to minimize pressure losses.
The angle of inclination of the swash plate (4) changes
according to the operating pressure of the pump P3 as
well as the operating pressure of the pumps P1 and P2.
The P-Q curve of the piston pump consequently be-
comes the curve that effectively uses the engine horse-
power (total horsepower control).

Takeuchi TB215R Specifications

General

Brand	Takeuchi
Model	TB215R
Category	Excavators
Language	English