Case CX800 Tier 3, Service Manual

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1002-11
Lep 9-94710NA Issued 06-06
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 ...................................................................................................... 278 cm
3
(16.96 cu in) X 2 /rev
Rated operating pressure ...................................................................................................31.4 MPa (4555 psi)
Maximum operating pressure .............................................................................................34.3 MPa (4975 psi)
Input revolution speed.......................................................................................................................1850 min-1
Maximum flow ............................................................................... 514.3 L/min (135.86 gpm) X 2 at 1850 min
-1
Input horsepower .................................................................................................................................310.7 kW
Shaft input horsepower ................................................................................................. 314.3 kW at 1850 min
-1
Shaft input torque....................................................................................... 1622 N•m (1197 lb-ft) at 1850 min
-1
Pilot pump
Pump type ........................................................................................................................................Gear pump
Displacement ..................................................................................................................15 cm
3
(0.91 cu in)/rev
Operating pressure ..................................................................... 4.4 MPa (638.16 psi) to 4.6 MPa (667.17 psi)
Maximum flow ....................................................................27.8 L/min (7.34 gpm) (at 1850 min
-1
) (1850 rpm
-1
)
Input horsepower .....................................................................................................................................3.6 kW
Control characteristics; simultaneous output control of overall, negative control, electric horse power control
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 ..............................................................................................................514.3 L / min (135.86 gpm)
Set pressure of main relief valve ......................standard; 31.4 MPa (4554 psi), power boost 34.3 MPa (4975 psi)
Set pressure of overload relief valve ................................................................. 36.3 MPa (5265 psi) at 20 L / min
Functions
Straight travel circuit
Boom UP / 2-speed internal confluence for Arm
Boom/arm load holding circuit
Boom down regenerative circuit
Arm IN forced regenerative circuit
Boom up priority (speed restriction of bucket)
Boom up priority (Speed restriction of swing)
Swing priority (Speed restriction of arm)
Bucket 2-speed internal confluence
Resevbe 2-speed internal confluence
Hydraulic Cylinders
Boom cylinder (2)
Inner diameter of tube x rod diameter x stroke .................................................................... 200x140x1893 mm
Arm (dipper) cylinder
Inner diameter of tube x rod diameter x stroke .................................................................... 215x150x2290 mm
Bucket cylinder (Standard boom specifications)
Inner diameter of tube x rod diameter x stroke .................................................................... 190x130x1555 mm
Bucket cylinder (Mass boom specifications)
Inner diameter of tube x rod diameter x stroke .................................................................... 215x150x1520 mm