Issued 09-2014
1002-17
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 .................................................................................................118.5 cm
3
(7.23 cu in) x 2 /rev
Rated operating pressure .......................................................................................................... 34.3 MPa (4975 psi)
Maximum operating pressure .................................................................................................... 36.8 MPa (5337 psi)
Input revolution speed
CX210B, CX230B ................................................................................................................................1800 min-1
CX240B................................................................................................................................................2000 min-1
Maximum discharge flow
CX210B, CX230B ................................................................................. 211 L/min (55.74 gpm) x 2 at 1800 min
-1
CX240B................................................................................................. 234 L/min (61.82 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
CX210B, CX230B .........................................................................................18 L/min (4.75 gpm) (at 1800 min
-1
)
CX240B.........................................................................................................20 L/min (5.28 gpm) (at 2000 min
-1
)
Control method
Hydraulic simultaneous constant output control.
Maximum flow adjustment control through external commands (negative control).
Setting horsepower adjustment control through external command current.
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
CX210B, CX230B.................................................................................... 211 L/min (55.74 gpm) x 2 (at 1800 min
-1
)
CX240B .........................................................................................................234 L/min (61.82 gpm) (at 2000 min
-1
)
Main relief set pressure ...........................................standard; 34.3 MPa (4975 psi), power boost 36.8 MPa (5337 psi)
Overload set pressure
CX210B (LR type)
.................................................................................................................................. bucket; 25.0 MPa (3626 psi)
.................................................................................................................................. arm in; 23.0 MPa (3336 psi)
CX240B (LR type)
.................................................................................................................................. bucket; 29.4 MPa (4264 psi)
............................................................................................................................... arm in; 21.1.0 MPa (3060 psi)
All
................................................................................................................ when boom down; 29.4 MPa (4264 psi)
.................................................................................................................................... other: 38.7 MPa (5613 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
Variable foot relief
