SPRING 1G7401 - Caterpillar

Table 2
Pressure Specifications    
System    Specifications    
Main pump pressure    
32000 to 34000 kPa (4640 to 4930 psi)    
Load sensing signal pressure    
30500 to 31500 kPa (4420 to 4565 psi)    
Margin pressure    
2000 to 2200 kPa (290 to 320 psi)    
Pilot pressure    
3000 to 3200 kPa (435 to 465 psi)    
Pilot accumulator gas charge pressure (1)
   
1000 kPa (145 psi)    
Main pump pressure (Proportional reducing valve)     Mode I     No load
1150 to 1200 kPa (165 to 180 psi)     Load
-75 bits    
Mode II No load
1550 to 1600 kPa (225 to 230 psi)     Load
-75 bits    
Mode III No load
1700 to 1750 kPa (245 to 255 psi)     Load
-50 bits    
Destroke pressure     Mode II    
14000 to 16000 kPa (2030 to 2320 psi)    
Swing cutoff pressure    
37000 to 38500 kPa (5365 to 5585 psi)    
Swing pump pressure (Proportional relief valve)     Mode I    
1000 to 1050 kPa (145 to 150 psi)    
Mode II
1600 to 1650 kPa (230 to 240 psi)    
Swing charge pressure (pump)    
2000 to 2200 kPa (290 to 320 psi)    
Swing brake    
3000 to 3200 kPa (435 to 465 psi)    
Wheel brake accumulator charging pressure     Cut-in    
12000 to 12500 kPa (1740 to 1812 psi)    
Cut-out
15000 to 15500 kPa (2175 to 2247 psi)    
Wheel brake accumulator gas charge pressure (1)    
4500 kPa (650 psi)    
Wheel brake valve     Front (disc)    
6000 to 7000 kPa (870 to 1015 psi)    
Rear (disc)
Front (disc)
7000 to 8000 kPa (1015 to 1160 psi)    
Rear (drum)
Axle accumulator gas charge pressure (1)    
1000 kPa (145 psi)    
Parking brake reserve pressure    
1150 to 1250 kPa (165 to 180 psi)    
Travel motor pressure (upstroke)    
25000 to 26000 kPa (3625 to 3770 psi)    
Backup mode (main pump and swing pump)     Mechanical    
1200 to 1300 kPa (175 to 190 psi)    
Electrical
1000 to 1250 kPa (145 to 180 psi)    
Steering pressure    
18000 to 19500 kPa (2610 to 2830 psi)    
Standby system pressure    
2500 to 3000 kPa (360 to 435 psi)    
Shift pressure     First gear    
3000 to 3200 kPa (435 to 465 psi)    
Second gear
( 1 ) Nitrogen gas pressure varies with the temperature. To obtain the most accurate nitrogen charge, the temperature of the accumulator must be identical to the air temperature around the accumulator. The specification is with an air temperature of 21 °C (70 °F). Refer to Testing and Adjusting, "Accumulator - Test and Charge" for additional charging pressure and temperature relationships.