2-40-1
NEGATIVE RELIEF VALVE OPERATION (TYPE 2)
When no function is being actuated on P1 side, the hydraulic fluid from the pump A2, flows into the
tank passage through the P1 bypass passage and orifice. The restriction caused by this orifice
thereby pressurizes. This pressure is transferred as the negative control signal pressure Pn1 to the
pump A2 regulator.
It controls the pump regulator so as to minimize the discharge of the pump A2.
The bypass passage is shut off when the shifting of one or more spools and the flow through
bypass passage became zero. The pressure of negative control signal becomes zero and the
discharge of the pump A2 becomes maximum.
The negative control pressure reaches to the set level, the hydraulic fluid in the passage pushes
open negative control valve and escapes into the return passage.
For the pump A1 the same negative control principle.
Bucket spool
Tank passage
P2 Bypass passage
P1 Bypass passage
P2 negative
relief valve
P1 negative
relief valve
Negative
control spring
Orifice
Tank passage
Pn1 port
Pn2 port
140L2MC128
Содержание HX140L
Страница 12: ...SECTION 1 GENERAL SECTION 1 GENERAL Group 1 Safety Hints 1 1 Group 2 Specifications 1 10...
Страница 209: ...4 5 MEMORANDUM...
Страница 275: ...4 49 No of pin Receptacle connector female Plug connector male 14 1 7 6 14 MG610406 KET SDL CONNECTOR 13...
Страница 675: ...8 58 29 Insert O rings to the relief valve 30 and reassemble them to rear cover 20 This completes assembly 17 32038SM42...
Страница 694: ...8 68 125LCR8TM30 Turn casing 1 upside down and remove oil seal 3 using jig 29...
Страница 703: ...8 77 125LCR8TM61 After assembling spring 44 in order clamp plug 41 Tightening torque 5 kgf m 36 lbf ft 31...
Страница 734: ...8 108 Assemble plug 2 Plug NPT1 16 11 EA 17 21078TM68 21078TM69 21078TM70 21078TM71...
Страница 756: ...8 130 Remove lock nut 22 and then boot 23 14 36078RL14 2507ARL10...
Страница 767: ...8 141 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...