CASE CONSTRUCTION CX130B - HYDRAULIC SYSTEM; Pump and Control Valve Specifications; Control Valve Functions

Issued 06-15
1002-14
Hydraulic system
Hydraulic pump drive system, directly coupled to the engine (no transmission)
Main pump
Manufacturer............................................................................................................................................... Kawasaki
Pump type .............................................................................................. double variable displacement piston pump
Displacement volume ..................................................................................................... 65 cm
3
(3.98 cu in) x 2 /rev
Rated operating pressure .......................................................................................................... 34.3 MPa (4975 psi)
Maximum operating pressure .................................................................................................... 36.3 MPa (5265 psi)
Set pressure of overload relief valve
:
Boom down ............................................................................................................................ 32.3 Mpa (
4684.7 psi)
Other
....................................................................................................................................... 38.2 Mpa (5540.4 psi)
Input revolution speed.............................................................................................................................. 2000 min-1
Maximum discharge flow ........................................................................... 130 L/min (34.34 gpm) x 2 at 2000 min
-1
Pilot pump
Pump type ............................................................................................................................................... Gear pump
Displacement volume ............................................................................................................ 10 cm
3
(0.61 cu in)/rev
Operating pressure ...................................................................................................................... 3.92 MPa (568 psi)
Maximum flow................................................................................................... 20 L/min (5.28 gpm) (at 2000 min
-1
)
Control method
Hydrau
lic simultaneous constant output control.
Maximum flow adjustment control through external commands (negative control).
Setting horsepower adjustment control through external command milli-amp.
Control Valve
Model; 4-spool section: integrated (1) or 5-spool section: integrated (1)
Operation method: hydraulic pilot method: travel, swing and operating machine
Maximum flow .................................................................................................130 L / min (34.34 gpm) (at 2000 min-1)
Main relief set pressure........................................... standard; 34.3 MPa (4975 psi), power boost 36.3 MPa (5265 psi)
Overload set pressure...................................................................................... when boom down; 32.3 MPa (4685 psi)
.............................................................................................................................................other: 38.2 MPa (5540 psi)
Foot relief set pressure ............................................................................................................... 2.55 MPa (369.85 psi)
Functions
Straight travel circuit
Boom up / arm 2 pumps internal flow
Boom and arm load holding circuit
Boom-down regenerative circuit
Bucket-close regenerative circuit
Arm-in forced regenerative circuit
Swing priority variable orifice (for arm operation)
2 pumps flow