EX355
T3-1-5
PUMP DEVICE
Regulator Functions
The regulator has the three following functions:
• Control by Pump Control Pressure
The pump control valve equipped in the control
valve regulates the pump control pressure in re-
sponse to the movements of the spool. The regula-
tor receives this pump control pressure signal and
controls the pump flow rate as follows.
When the control valve spool is moved and the
pump control pressure is increased, the regulator
increases the pump flow rate.
When the control valve spool is returned to the neu-
tral position and the pump control pressure is re-
duced, the regulator decreases the pump flow rate.
(Refer to the Control Valve group pages.)
• Control by Pump Delivery Pressure
The delivery pressure of both main pump 1 and
main pump 2 are routed to the regulator. When the
average pressure of the two pumps exceeds the
specified P-Q line, the regulator reduces both pump
flow rates so that the pump performance is returned
to the specified P-Q line. Thus, the engine is pro-
tected from overloads. The designed P-Q line has
been determined based on the two pump perform-
ance. Therefore, both pump flow rates are set to
almost equal value. Accordingly, the high pressure
pump is loaded heavier than the low pressure
pump. Then, the total output of the two pumps is
equal to the engine output (Total Horsepower Con-
trol).
• Control by Pilot Pressure from Solenoid Valve Unit
(SD)
The MC (main controller) compares the engine
target speed with the actual engine speed and
sends control signals to solenoid valve unit (SD).
The solenoid valve unit (SD) delivers the pilot oil
pressure in response to control signal from the MC
to the regulator. When the regulator receives the
pilot pressure, the regulator reduces the pump flow
rate (Speed Sensing [Horsepower Reduction] Con-
trol). (Refer to the Control System group pages.)
Q
0
Pi
Pump control pressure
SM0011
0
Q
P
Pressure
0
P
Pressure increase
Flow rate decrease
Q
Pressure
Flow rate
Flow rate
Flow rate
Summary of Contents for EX355 Tier2
Page 22: ...T1 2 10 EX355 COMPONENT LAYOUT NOTES ...
Page 37: ...T2 1 14 EX355 CONTROL SYSTEM NOTES ...
Page 47: ...T2 2 10 EX355 HYDRAULIC SYSTEM NOTES ...
Page 73: ...T2 3 26 EX355 ELECTRICAL SYSTEM NOTES ...
Page 86: ...T3 1 12 EX355 PUMP DEVICE NOTES ...
Page 94: ...T3 2 8 EX355 SWING DEVICE NOTES ...
Page 134: ...T3 4 10 EX355 PILOT VALVE NOTES ...
Page 146: ...T3 5 12 EX355 TRAVEL DEVICE NOTES ...
Page 156: ...T3 7 4 EX355 OTHER COMPONENTS Undercarriage NOTES ...
Page 195: ...T4 2 6 EX355 STANDARD NOTES ...
Page 199: ...T4 3 4 EX355 ENGINE TEST NOTES ...
Page 215: ...T4 4 16 EX355 EXCAVATOR TEST NOTES ...
Page 237: ...T4 5 22 EX355 COMPONENT TEST NOTES ...
Page 265: ...T5 2 12 EX355 COMPONENT LAYOUT NOTES ...
Page 325: ...T5 4 52 EX355 TROUBLESHOOTING B ...
Page 372: ...EX355 T5 6 9 ELECTRICAL SYSTEM INSPECTION ...
Page 385: ...T5 6 22 EX355 ELECTRICAL SYSTEM INSPECTION NOTE ...
Page 425: ...W1 1 4 EX355 PRECAUTIONS FOR DISASSEMBLY AND ASSEMBLY NOTES ...
Page 450: ...W2 3 8 EX355 MAIN FRAME NOTES ...
Page 454: ...W2 4 4 EX355 PUMP DEVICE SM5510 ...
Page 456: ...W2 4 6 EX355 PUMP DEVICE SM5510 ...
Page 458: ...W2 4 8 EX355 PUMP DEVICE ASSEMBLE PUMP DEVICE SM6205 SM6206 ...
Page 460: ...W2 4 10 EX355 PUMP DEVICE SM6205 SM6206 ...
Page 462: ...W2 4 12 EX355 PUMP DEVICE SM6205 SM6206 ...
Page 464: ...W2 4 14 EX355 PUMP DEVICE SM6205 SM6206 ...
Page 468: ...W2 4 18 EX355 PUMP DEVICE SM6210 ...
Page 470: ...W2 4 20 EX355 PUMP DEVICE SM6210 ...
Page 472: ...W2 4 22 EX355 PUMP DEVICE SM6210 ...
Page 474: ...W2 4 24 EX355 PUMP DEVICE SM5511 SM6219 ASSEMBLE MAIN PUMP ...
Page 476: ...W2 4 26 EX355 PUMP DEVICE SM5511 SM6219 ...
Page 478: ...W2 4 28 EX355 PUMP DEVICE SM5511 SM6219 ...
Page 480: ...W2 4 30 EX355 PUMP DEVICE SM5511 SM6219 ...
Page 482: ...W2 4 32 EX355 PUMP DEVICE SM5511 SM6219 ...
Page 484: ...W2 4 34 EX355 PUMP DEVICE SM5511 SM6219 ...
Page 486: ...W2 4 36 EX355 PUMP DEVICE SM5511 SM6219 ...
Page 498: ...W2 4 48 EX355 PUMP DEVICE NOTES ...
Page 532: ...W2 5 34 EX355 CONTROL VALVE NOTES ...
Page 540: ...W2 6 8 EX355 SWING DEVICE SM6277 31 18 17 20 19 21 3 24 27 25 26 10 ...
Page 542: ...W2 6 10 EX355 SWING DEVICE SM6277 31 19 2 1 23 22 ...
Page 566: ...W2 7 12 EX355 PILOT VALVE 11 19 17 18 1 2 3 8 13 14 16 15 SM1114 ...
Page 572: ...W2 7 18 EX355 PILOT VALVE 8 6 7 1 3 4 5 9 21 2 SM1119 ...
Page 586: ...W2 7 32 EX355 PILOT VALVE NOTES ...
Page 592: ...W2 8 6 EX355 PILOT SHUT OFF VALVE NOTES ...
Page 602: ...W2 10 6 EX355 SOLENOID VALVE UNIT NOTES ...
Page 621: ...W3 2 10 EX355 TRAVEL DEVICE SM5108 44 8 13 12 1 45 46 28 27 25 26 24 36 38 30 31 32 ...
Page 627: ...W3 2 16 EX355 TRAVEL DEVICE SM5502 3 4 5 20 7 8 9 10 12 14 13 16 11 6 ...
Page 643: ...W3 2 32 EX355 TRAVEL DEVICE NOTES ...
Page 651: ...W3 3 8 EX355 CENTER JOINT NOTES ...
Page 655: ...W3 4 4 EX355 TRACK ADJUSTER 8 14 13 11 17 12 SM6284 ...
Page 657: ...W3 4 6 EX355 TRACK ADJUSTER 3 4 8 10 16 15 14 SM6284 ...
Page 659: ...W3 4 8 EX355 TRACK ADJUSTER 3 6 4 8 10 9 SM6284 18 ...
Page 667: ...W3 4 16 EX355 TRACK ADJUSTER NOTES ...
Page 671: ...W3 5 4 EX355 FRONT IDLER 1 SM6290 2 4 3 5 6 8 12 7 6 3 4 1 2 9 10 11 ...
Page 689: ...W3 6 14 EX355 UPPER AND LOWER ROLLER NOTES ...
Page 708: ...W4 1 10 EX355 FRONT ATTACHMENT NOTES ...
Page 716: ...W4 1 18 EX355 FRONT ATTACHMENT NOTES ...
Page 744: ...W4 2 28 EX355 CYLINDERS NOTES ...
Page 763: ...EX355 W5 1 17 GENERAL INFORMATION Oil Pan N m kgf m Ib ft SM7010 ...
Page 765: ...EX355 W5 1 19 GENERAL INFORMATION Water Pump N m kgf m Ib ft SM7012 ...
Page 815: ...EX355 W5 3 35 ENGINE OVERHAUL Disassembly SM7093 1 Camshaft gear 2 Knock pin 3 Camshaft ...
Page 883: ...EX355 W5 3 103 ENGINE OVERHAUL Reassembly 1 Crankshaft 3 Crankshaft gear 2 Pin SM7239 ...
Page 894: ...W5 3 114 EX355 ENGINE OVERHAUL NOTE ...
Page 938: ...W5 7 6 EX355 ENGINE INDUCTION NOTE ...