Case CX75SR TIER 3 - Hydraulic System

Lep SC75SRCX80-1002-0NA Issued 03-08
1002-13
Lighting
Other
Wiper with intermittent function, window washer, air conditioner, rear view mirrors, clock
Hydraulic system
Hydraulic pump drive system, direct engine link (no transmission)
Main pump
Manufacturer ...................................................................................................................................... Bosch Rexroth
Pump type ........................................................................................double variable displacement piston pump x 1
Gear pump ........................................................................................................................................................... x 2
Gear pump (for blade use) ........................................................................................................................24.2 L/min
Displacement volume ..................................................................................................34.0 cm
3
(2.07 cu in) x 2 /rev
Operating pressure Rated .................................................................................................... 29.4 MPa (4264.11 psi)
Input revolution speed Rated.................................................................................................2000 min-1 (2000 rpm)
Maximum input revolution speed........................................................................................... 2250 min-1 (2250 rpm)
Maximum discharge flow........................................................68 x 2 L/min at 2000 min-1 (18 x 2 gpm at 2000 rpm)
Pilot pump
Pump type ................................................................................................................Fixed displacement gear pump
Displacement volume ......................................................................................................... 10.7 cm
3
(0.65 cu in)/rev
Operating pressure........................................................................................................................ 4.2 MPa (610 psi)
Maximum flow.................................................................................................... 21.4 L/min (5.6 gpm) at 2000 min-1
Gear pump (for blade)
Pump type ................................................................................................................Fixed displacement gear pump
Displacement volume .......................................................................................................................... 12.1 cm
3
/ rev
Operating pressure.................................................................................................................... 22.6 MPa (3280 psi)
Maximum flow.................................................................................................... 24.2 L/min (6.4 gpm) at 2000 min-1
Control method
Full hosepower angle control in concurrence.
Horsepower control by blade pump operation pressure.
Set pressure of main relief valve
Boom/Arm/ Bucket/Travel .................................................................................................... 29.4 MPa (4264.11 psi)
Swing.................................................................................................................................... 22.6 MPa (3277.85 psi)
Blade .................................................................................................................................... 22.6 MPa (3277.85 psi)
Set pressure of overload relief valve
Boom/Arm/ Bucket............................................................................................................... 31.9 MPa (4626.70 psi)
Blade .................................................................................................................................... 25.5 MPa (3698.46 psi)
Control Valve
Model; Double spool x 1 Quintuple spool x 2
Operation method: hydraulic pilot method: travel, swing, blade and operating machine
Maximum flow
Mono Boom with blade................................................................................... 75.8 L / min (20 gpm) (at 2230 min-1)
Offset Boom with blade (CX75SR) .............................................................. 75.2 L / min (19.8 gpm) (at 2320 min-1)
Overload set pressure
Other:
Mono Boom with blade.......................................................................... 31.9 ± 0.3 MPa (4630 ± 44 psi) at 20 L/min
Offset Boom with blade (CX75SR) ........................................................ 31.9 ± 0.3 MPa (4630 ± 44 psi) at 20 L/min
Boom (CX80):
Swing right ........................................................................................ 33.3 ± 0.3 MPa (4830 ± 44 psi) at 20 L/min
Swing left .......................................................................................... 31.9 ± 0.3 MPa (4630 ± 44 psi) at 20 L/min
Boom up/down (CX75SR)
Mono Boom with blade ..................................................................... 25.5 ± 0.3 MPa (3700 ± 44 psi) at 20 L/min
Offset Boom with blade..................................................................... 25.5 ± 0.3 MPa (3700 ± 44 psi) at 20 L/min
Offset right (CX75SR)
Offset Boom with blade..................................................................... 31.9 ± 0.3 MPa (4630 ± 44 psi) at 20 L/min
Working light Cab top: 24V, 55W (x1)
Boom up: 24V, 70W (x1)
Interior light 24V, 6W (x1)
Horn Electric horn x2