Case CX350B - Hydraulic System

Lep SM350B370B1002-2EN Issued 04-2010
1002-13
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 ...........................................................................................................150 cm
3
( cu in) x 2 /rev
Rated operating pressure .......................................................................................................... 34.3 MPa (4975 psi)
Maximum operating pressure .................................................................................................... 37.3 MPa (5410 psi)
Input revolution speed ..............................................................................................................................2000 min-1
Maximum discharge flow ........................................................................... 300 L/min (79.25 gpm) x 2 at 2000 min
-1
Pilot pump
Pump type ...............................................................................................................................................Gear pump
Displacement volume .............................................................................................................15 cm
3
(0.91 cu in)/rev
Operating pressure..................................................................................................................... 3.9 MPa (567,7 psi)
Maximum flow....................................................................................................30 L/min (7.92 gpm) (at 2000 min
-1
)
Input horsepower............................................................................................................................................ 2.8 kW
Control method
Hydraulic 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................................................................................................. 292.5 L / min (77.27 gpm) at 1950 min
-1
Main relief set pressure ...........................................standard; 34.3 MPa (4975 psi), power boost 37.3 MPa (5410 psi)
Overload set pressure ..................................................................................... when boom down; 27.4 MPa (3974 psi)
............................................................................................................................................. other: 39.2 MPa (5685 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
Hydraulic Cylinders
Boom cylinder (x2)
Cylinder bore ............................................................................................................................. Ø145 mm (Ø5.70 in)
Rod diametre .............................................................................................................................Ø100 mm (Ø3.93 in)
Maximum retracted lenghth ........................................................................................................ 2090 mm (82.28 in)
Stroke ......................................................................................................................................... 1495 mm (58.85 in)
Arm (dipper) cylinder
Cylinder bore ............................................................................................................................. Ø170 mm (Ø6.69 in)
Rod diametre .............................................................................................................................Ø120 mm (Ø4.72 in)
Maximum retracted lenghth ........................................................................................................ 2445 mm (96.25 in)
Stroke ......................................................................................................................................... 1748 mm (68.81 in)
Bucket cylinder
Cylinder bore ................................................................................................................................150 mm (Ø5.90 in)
Rod diametre .............................................................................................................................Ø105 mm (Ø4.13 in)
Maximum retracted lenghth ........................................................................................................ 1870 mm (73.62 in)
Stroke ......................................................................................................................................... 1210 mm (47.63 in)
Issued 11-2015