CHART-DUTY 1246633 - Caterpillar

Table 3
Oscillating Accumulator    
Charging Pressure and Temperature Relationship for a Typical
1000 kPa (145 psi) Accumulator    
Temperature °C (°F)    Pressure kPa (psi)    
−7 °C (20 °F)    
906 kPa (131 psi)    
−1 °C (30 °F)    
925 kPa (134 psi)    
4 °C (40 °F)    
943 kPa (137 psi)    
10 °C (50 °F)    
962 kPa (140 psi)    
16 °C (60 °F)    
981 kPa (142 psi)    
21 °C (70 °F)    
1000 kPa (145 psi)    
27 °C (80 °F)    
1019 kPa (148 psi)    
32 °C (90 °F)    
1038 kPa (151 psi)    
38 °C (100 °F)    
1057 kPa (153 psi)    
43 °C (110 °F)    
1075 kPa (156 psi)    
49 °C (120 °F)    
1094 kPa (159 psi)    
Table 4
Service Brake Accumulator    
Charging Pressure and Temperature Relationship for a Typical
4500 kPa (653 psi) Accumulator    
Temperature °C (°F)    Pressure kPa (psi)    
−7 °C (20 °F)    
4075 kPa (592 psi)    
−1 °C (30 °F)    
4160 kPa (604 psi)    
4 °C (40 °F)    
4245 kPa (616 psi)    
10 °C (50 °F)    
4330 kPa (628 psi)    
16 °C (60 °F)    
4415 kPa (641 psi)    
21 °C (70 °F)    
4500 kPa (653 psi)    
27 °C (80 °F)    
4585 kPa (665 psi)    
32 °C (90 °F)    
4670 kPa (678 psi)    
38 °C (100 °F)    
4755 kPa (690 psi)    
43 °C (110 °F)    
4840 kPa (702 psi)    
49 °C (120 °F)    
4925 kPa (715 psi)    If an accumulator has less than half of the required amount of precharge pressure, the accumulator should be charged. Then charge the accumulator again after you apply the service brakes repeatedly in order to prevent trapping oil in the accumulator. Oil in the accumulator will give an inaccurate precharge reading.
Illustration 1 g00839120
(1) 152-2023 Accumulator Charging Group (2) Socket head (3) Valve (4) Pressure gauge (5) 9U-6741 Adapter (6) 1P-7326 Washer (7) 8T-7860 Connector (8) 3J-7354 O-Ring Seal (9) 5P-2937 O-Ring Adapter (10) 5P-8998 Fitting (11) Pressure gauge (12) Valve (13)