Daewoo Solar 300LC-V, Manual

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S0708315K
Page 34 Main Pump (Kawasaki)
2. Adjustment of flow control characteristic
The flow control characteristic can be
adjusted with the adjusting screw.
Adjust it by loosening the hexagon nut
(801) and by tightening (or loosening) the
hexagonal socket head screw (924).
Tightening the screw shifts the control
chart to the right as shown in the Figure
25.
NOTE: Adjusting values are shown in
the attached Table. See
“Summary of Regulator
Adjustment Values” on
page -38.
Total Horsepower Control
The regulator decreases the pump tilting angle
(delivery flow) automatically to limit the input
torque within a certain value with a rise in the
delivery pressure P1 of the self pump and the
delivery pressure P2 of the companion pump.
(The input horsepower is constant when the
speed is constant.)
Since the regulator is of the simultaneous total
horsepower type that operates by the sum of
load pressures of the two pumps in the tandem
double-pump system, the prime mover is
automatically prevented from being overloaded,
irrespective of the load condition of the two
pumps, when horsepower control is under way.
1. Functional explanation
Since this regulator is of the simultaneous total horsepower type, it controls the tilting angles
(displacement volumes) of the two pumps to the same values as represented by the following
equation:
• T in = P1 x q/2
π
+ P2 x q/2
π
= (P1 + P2) x q/2
π
The horsepower control function is the same as the flow control function and is summarized in the
following. (For detailed behaviors of respective parts, refer to the section of flow control).
A. Overload Preventive Function
When the self pump delivery pressure P1 or the companion pump delivery pressure P2 rises, it
acts on the stepped part of the compensating piston (621). It presses the compensating rod
(623) to the right till the force of the outer spring (625) and inner spring (626) balances with the
hydraulic force. The movement of the compensating rod is transmitted to Lever 1 via pin (875).
Lever 1 rotates around the pin (875) (E) attached to the casing (601).
Since the large-hole section (F) of Lever 1 contains a protruding pin (897) attached to the
feedback lever (611), the feedback lever rotates around the fulcrum of Point D as Lever 1
rotates, and then the spool (652) is shifted to the right. As the spool moves, the delivery
pressure P1 is admitted to the large-diameter section of the servo piston via Port C liter, causes
Figure 25
Figure 26