442 Hydraulic Schematic v-0621ledged-2

Posted in 442
HYDRAULIC/HYDROSTATIC SCHEMATIC
442 EXCAVATOR
(S/N 528611001 AND ABOVE)
(S/N 528911001 AND ABOVE)
(PRINTED MAY 2010)
V-0621legend
PORT RELIEF VALVE - Boom Cyl.
(Rod End) 4350 PSI (300 bar)
BACK-UP RELIEF VALVE
4350 PSI (300 bar)
1
LOAD SENSE RELIEF VALVE
4060 PSI (280 bar)
2
3
4
15
19
5
20
21
PRESSURE REDUCING VALVE
508 PSI (35 bar)
22
ACCUMULATOR 145 PSI (10 bar)
23
CHECK VALVE
24
HYDRAULIC PISTON PUMP
Minimum Displacement
0.0 GPM (0.0 L/min) @ 2200 RPM
Maximum Displacement
41.2 GPM (156 L/min) @ 2200 RPM
25
TORQUE LIMITOR
26
PUMP MARGIN SPOOL
27
TORQUE LIMITER SUPPLY SPOOL
28
OIL COOLER BY-PASS VALVE
43.5 PSI (3 bar)
LEGEND
PILOTED OPERATED TWO POSITION
VALVE (2)
LOAD SENSE BLEED CARTRIDGE
6
7
8
9
10
11
12
13
Printed in U.S.A.
14
CHECK VALVE (2)
29
OIL COOLER
30
HYDRAULIC PUMP Gear Type
17.9 GPM (68 L/min.) at 2200 Engine RPM
31
16
17
CROSS PORT RELIEF VALVE - 2 STAGE
1450 PSI (100 bar) / 3625 PSI (250 bar)
18
ANTI-CAVITATION VALVE
ORIFICE 0.003 inch (0,8 mm)
ORIFICE - One Way Restrictor
0.0023 inch (0,6 mm)
PORT RELIEF VALVE - Boom Cyl.
(Base End) 2610 PSI (180 bar)
PORT RELIEF VALVE - Arm Cyl.
(Rod End) 4350 PSI (300 bar)
PORT RELIEF VALVE - Arm Cyl.
(Base End) 4350 PSI (300 bar)
PORT RELIEF VALVE - Bucket Cyl.
(Rod End) 4350 PSI (300 bar)
PORT RELIEF VALVE - Bucket Cyl.
(Base End) 4350 PSI (300 bar)
PORT RELIEF VALVE - Auxiliary
4350 PSI (300 bar)
PORT RELIEF VALVE - Auxiliary
4350 PSI (300 bar)
MAIN RELIEF VALVE (Gear Pump)
3335 PSI (230 bar)
PORT RELIEF VALVE (2):
5075 PSI (350 bar)
ORIFICE (2)
CONSOLE/JOYSTICK SHUT-OFF
SOLENOID VALVE
365 PSI (25 bar)
290 PSI (20 bar)
NOTE: With clamp installed - Reset
port relief valve to 3625 PSI (250 bar)
32
TWO SPEED SOLENOID VALVE
1 of 2
Dealer Copy -- Not for Resale
34
PRESSURIZED BREATHER / FILL CAP
5 PSI (0,34 bar)
35
HYDRAULIC RESERVOIR - PRESSURIZED
Reservoir Volume 29 gal (110 L)
System Volume 37 gal (140 L)
36
COMPENSATOR - Standard
( Boom, Arm, Bucket, Auxiliary, Left Travel
and Right Travel)
37
CROSS PORT RELIEF VALVE -
Travel Motor 4060 PSI (280 bar)
38
COUNTERBALANCE SPOOL (Travel
Motor)
39
TWO SPEED SHIFT SPOOL
40
V-0621legend (5-1-10)
NOTE: Unless otherwise specified
springs have NO significant
pressure value.
33
MAIN FILTER
With 43.5 PSI (3 bar) Filter By-Pass Valve
41
BRAKE CONTROL SPOOL
42
SELECTOR VALVE - MANUAL
(Bucket Cylinder or Secondary Auxiliaries)
SHUTTLE VALVE - DRIVE PRESSURE
43
CHECK VALVE (8)
44
LOAD CHECK VALVE - Boom Swing
334 PSI (23 bar)
45
ISO/STANDARD VALVE
46
SLEW BRAKE SOLENOID VALVE
47
CHECK VALVE
43.5 PSI (3 bar)
HYDRAULIC/HYDROSTATIC SCHEMATIC
442 EXCAVATOR
(S/N 528611001 AND ABOVE)
(S/N 528911001 AND ABOVE)
(PRINTED MAY 2010)
V-0621legend
LEGEND
2 of 2
Dealer Copy -- Not for Resale