a770 Hydraulic Schematic v-1437legend-2

HYDRAULIC/HYDROSTATIC SCHEMATIC
AWS WITH NO OPTIONS
A770 (S/N A3P6 AND ABOVE)
(S/N A3P7 AND ABOVE)
(PRINTED DECEMBER 2010)
V-1437legend
FILTER - HYDRAULIC (CANISTER)
SPRING LOADED FILTER BY-PASS
VALVE: 172 kPa (1,7 bar) (25 psi)
RESERVOIR:
Capacity at sight gauge . 9,8 L (2.6 U.S. gal)
System Capacity . . . . . . 37,9 L (10.0 U.S. gal)
1
2
19
PULL BUTTON ACTIVATED
DIRECTIONAL CONTROL VALVE - LIFT
ARM BY-PASS
LOAD CHECK VALVE
9
RELIEF VALVE - MAIN:
24132 kPa (241 bar) (3500 psi)
at Front Quick Couplers
11
12
SOLENOID ACTIVATED DIRECTIONAL
CONTROL VALVE - AUXILIARY
10
5
6
24
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LEGEND
PILOTED ACTIVATED DIRECTIONAL
CONTROL VALVE - LIFT CONTROL
PILOTED ACTIVATED DIRECTIONAL
CONTROL VALVE - TILT CONTROL
DIFFERENTIAL PRESSURE SWITCH:
103 kPa (1,03 bar) (15 psi)
Normally Closed
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Printed in U.S.A.
SOLENOID ACTIVATED DIRECTIONAL
CONTROL VALVE - BICS CONTROL
8
23
35
4
7
FRONT AUXILIARY MANUAL PRESSURE
BLEED-OFF VALVE
13
LIFT CYLINDER SPOOL - MADE TO
RESTRICT FLOW DURING BOOM
DOWN BUT NOT DURING BOOM UP
RELIEF/ANTICAVITATION VALVE -
PORT: 27579 kPa (276 bar) (4000 psi)
FIXED CAPACITY DISPLACEMENT
HYDRAULIC MOTOR
ANTICAVITATION VALVE
PROPORTIONAL RELIEF VALVE –
(Fan Speed Regulator): 10797-12300 kPa
(108 - 123 bar) (1566 - 1784 psi)
SENSOR – CHARGE PRESSURE –
Fan Filter
15
SIGHT GAUGE
DIAGNOSTIC COUPLER
RELIEF/ANTICAVITATION VALVE -
PORT (OPTIONAL):
27579 kPa (276 bar) (4000 psi)
SPRING LOADED FILTER BY-PASS VALVE:
517 – 572 kPa (5,2 - 5,7 bar) (75 - 83 psi)
FILTER - HYDRAULIC (CANISTER)
30
FIXED CAPACITY DISPLACEMENT
BIDIRECTIONAL HYDROSTATIC MOTOR
FILTER - BICS CONTROL VALVE
(SCREEN)
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16
CHECK VALVE - With 100 kPa 1,0 bar
(14.5 psi) Spring
18
RESTRICTION . . . . . . . 2,0 mm (0.079 in)
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RELIEF/REPLENISHING VALVE - HIGH
PRESSURE: 36500 kPa (365 bar) (5294 psi)
VARIABLE CAPACITY DISPLACEMENT
BIDIRECTIONAL HYDROSTATIC PUMP
RELIEF VALVE - CHARGE INLET:
2654 kPa (26,5 bar) (385 psi) at High
Engine Idle With 60 ° C (140 ° F) Fluid
ANTICAVITATION VALVE
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36
37
SERVO PISTON – Swash Plate
SOLENOID ACTIVATED DIRECTIONAL
CONTROL VALVE – FORWARD/REVERSE
FILTER
CHECK VALVE - With 1379 kPa (13,8 bar)
(200 psi) Spring
DRIVE MOTOR SHUTTLE VALVE
CHECK VALVE – COLD WEATHER BY-PASS
With 345 kPa (3,45 bar) (50 psi) Spring
RESTRICTION – 1,7 mm (0.067 in)
14
SENSOR – HYD. TEMPERATURE
39
1 of 2
Dealer Copy -- Not for Resale
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V-1437legend (1-3-11)
NOTE: Unless otherwise specified, springs have
NO significant pressure value.
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FILTER - BRAKE
HYDRAULIC BRAKE – SPRING APPLIED –
PRESSURE RELEASE (SAPR)
SOLENOID ACTIVATED DIRECECTIONAL
CONTROL VALVE – BRAKE
CHECK VALVE
)
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HYDRAULIC PUMP . . . . . . . Gear Type
87,1 L/min (23.0 U.S. gpm) at High Engine Idle
CHARGE PUMP . . . . . . . Gear Type
51,1 L/min (13.5 U.S. gpm) at High Engine Idle
FIXED CAPACITY DISPLACEMENT
BIDIRECTIONAL HYDROSTATIC
MOTOR – 2 Speed
SOLENOID ACTIVATED DIRECTIONAL
CONTROL VALVE – 2 Speed Shift
SOLENOID ACTIVATED DIRECTIONAL
CONTROL VALVE – 2 Speed Make-up
PILOT ACTIVATED DIRECTIONAL
CONTROL VALVE – 2 Speed
STEERING PUMP . . . . . . . Gear Type
51,1 L/min (13.5 U.S. gpm) at High Engine Idle
CHECK VALVE - With 1862 kPa (18,6 bar)
(270 psi) Spring
RELIEF VALVE: 13790 kPa (138 bar) (2000 psi)
SOLENOID ACTIVATED DIRECTIONAL
CONTROL VALVE - TWO COIL - STEERING
FILTER – STEERING VALVE
HYDRAULIC/HYDROSTATIC SCHEMATIC
AWS WITH NO OPTIONS
A770 (S/N A3P6 AND ABOVE)
(S/N A3P7 AND ABOVE)
(PRINTED DECEMBER 2010)
V-1437legend
LEGEND
2 of 2
Dealer Copy -- Not for Resale