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2-18
Power shift control
The set horsepower valve is shifted by
varying the command current level of
the proportional pressure reducing
valve attached to the pump.
Only one proportional pressure redu-
cing valve is provided.
However, the secondary pressure Pf
(power shift pressure) is admitted to the
horsepower control section of each
pump regulator through the pump's
internal path to shift it to the same set
horsepower level.
This function permits arbitrary setting of the pump output power, thereby providing the optimum
power level according to the operating condition.
The power shift pressure Pf controls the set horsepower of the pump to a desired level, as
shown in the figure.
As the power shift pressure Pf rises, the compensating rod (623) moves to the right via the pin
(898) and compensating piston (621).
This decreases the pump tilting angle and then the set horsepower in the same way as
explained in the overload preventive function of the horsepower control. On the contrary, the
set horsepower rises as the power shift pressure Pf falls.
(3)
Delivery pressure, (P
1
+P
2
)
Deliv
er
y flo
w
, Q
P
f
=MAX.
P
f
=MIN.
Servo piston
Small diameter
chamber
Large diameter
chamber
D
CL
P1
651
625
621 652
623 612 601
626
897
F
B(E)
875
611
P1
P2
140Z92RG05
Содержание HX130 LCR
Страница 11: ...1 1 SECTION 1 GENERAL Group 1 Safety Hints 1 1 Group 2 Specifications 1 10 ...
Страница 174: ...4 5 MEMORANDUM HYUNDAI HEAVY INDUSTRIES CO LTD CONSTRUCTION EQUIPMENT DIV ...
Страница 218: ...4 49 4 49 No of pin Receptacle connector female Plug connector male 14 1 7 6 14 MG610406 KET SDL CONNECTOR 13 ...
Страница 517: ...8 89 Insert O rings to the relief valve 30 and reassemble them to rear cover 20 This completes assembly 17 32038SM42 ...
Страница 536: ...8 108 125LCR8TM30 Turn casing 1 upside down and remove oil seal 3 using jig 29 ...
Страница 545: ...8 117 125LCR8TM61 After assembling spring 44 in order clamp plug 41 Tightening torque 5 5 0 5 kgf m 39 8 3 6 lbf ft 31 ...
Страница 566: ...8 138 Remove lock nut 22 and then boot 23 14 36078RL14 2507ARL10 ...
Страница 577: ...8 149 14 15 3 Install cover 3 to body 1 and tighten bolts 14 Torque 10 12 5 kgf m 72 3 90 4 lbf ft 7 21078DA10 ...
Страница 609: ...8 181 1 STRUCTURE GROUP 11 WORK EQUIPMENT SECTION C SECTION B SECTION A 130ZF8DA44 SECTION A SECTION B SECTION C ...