John Deere 495D - Manual (Page 2)

-181- Continued on next page
HYDRAULIC SYSTEM—Open-Center
Main Pump:
Type.............................................................................. 2 variable-displacement axial-piston
System Pressure—Travel............................................. 4620 ± 150 psi (31 855 ± 1035 kPa)
System Pressure—Digging .......................................... 4050 ± 150 psi (27,925 ± 1035 kPa)
Minimum Flow .............................................................. 28 gpm (106 L/min) used at 2500 psi (17237 kPa) and
2200 rpm
Steering Pump:
Type.............................................................................. Gear
System Pressure .......................................................... 1775 ± 25 psi (12 300 ± 175 kPa) at fast idle
System Crossover Relief Valve .................................... 2465 psi (17 000 kPa)
Minimum Flow .............................................................. 5.7 gpm (21.64 L/min) used at 1775 psi (12 300 kPa) and
2100 rpm
Pilot Pump:
Type.............................................................................. Gear
System Pressure .......................................................... 640 ± 70 psi (4410 ± 480 kPa) at fast idle
Minimum Flow .............................................................. 5.5 gpm (20.8 L/min) at 2200 rpm
RELIEF VALVE SETTINGS
Boom I (Head and Rod) Front Pump ................................... 4260 + 140 - 0 psi (29 372 + 965 - 0 kPa)
Arm I (Head and Rod) Rear Pump ...................................... 4260 + 140 - 0 psi (29 372 + 965 - 0 kPa)
Bucket (Head and Rod) Front Pump ................................... 4770 + 140 - 0 psi (32 888 + 965 - 0 kPa)
Rear or Blade Stabilizer
(Head and Rod) Rear Pump............................................ 4260 + 140 - 0 psi (32 888 + 965 - 0 kPa)
Swing Brake Valve Circuit Relief Valve Left and
Right (Crossover Relief) Rear Pump............................... 3340 ± 140 psi (23 030 ± 965 kPa)
CYCLE TIMES (At Fast Idle)
Function New Machine Max Allowable
Boom Raise ......................................................................... 2.7 ± 0.3 sec 3.5 sec
Boom Lower ........................................................................ 2.3 ± 9.3 sec 3.0 sec
Arm Out ............................................................................... 2.1 ± 0.3 sec 2.8 sec
Arm In .................................................................................. 3.3 ± 0.4 sec 4.2 sec
Bucket Roll-Out ................................................................... 2.2 ± 0.3 sec 2.9 sec
Bucket Roll-In ...................................................................... 3.6 ± 0.3 sec 4.5 sec
Swing (3 Revolutions).......................................................... 12.5 ± 1.0 sec 16.2 sec
Stabilizer Extend .................................................................. 1.54 ± 0.3 sec 2 sec
Stabilizer Retract.................................................................. 1.41 ± 0.3 sec 1.83 sec