HOSE, FLEXIBLE 0962410 - Caterpillar

Charging Procedure for New Accumulators
Dry nitrogen is the only gas approved for use in the accumulators. The charging of oxygen gas in an accumulator will cause an explosion. An explosion can be eliminated by using nitrogen gas cylinders with standard CGA (Compressed Gas Association, Inc.) No. 580 connectors. When nitrogen gas is ordered, make sure to order the cylinders with CGA No. 580 connectors.Do not rely on color codes or other methods of identification to tell the difference between nitrogen and oxygen cylinders. In any application, never use an adapter to connect your nitrogen charging group to a valve outlet used on both nitrogen, oxygen, or other gas cylinders. BE SURE YOU USE DRY NITROGEN (99.8% purity).
Table 2
Required Tools    
Part Number     Description    
7S-5437     Nitrogen Charging Equipment    To ensure that the nitrogen charge is correct, each brake accumulator must not be compressed. Nitrogen gas pressure varies with the temperature. To obtain the most accurate nitrogen charge, the temperature of each accumulator must be identical to the air temperature around the accumulators.If an accumulator has less than half of the required amount of precharge pressure, the accumulator should be charged, and then charged again after operating the service brakes several times. This prevents trapping a quantity of oil in the accumulator which will give an inaccurate precharge reading.However, the temperature of the accumulators could be higher than the air temperature around the accumulators. In this case, the temperature of the accumulator should be used instead of the surrounding air temperature.Note: The pressures in the following table are for an ambient air temperature of 21 °C (70 °F). Adjust the pressure for other ambient conditions, as required.
Table 3
Accumulator Precharge Pressure/Temperature Relationship for the
6900 kPa (1000 psi) Service Brake Accumulators    
Temperature     Pressure    
-7°C (20°F)    
6250 kPa (907 psi)    
-1°C (30°F)    
6380 kPa (926 psi)    
4°C (40°F)    
6510 kPa (945 psi)    
10°C (50°F)    
6640 kPa (964 psi)    
16°C (60°F)    
6770 kPa (983 psi)    
21°C (70°F)    
6900 kPa (1000 psi)    
27°C (80°F)    
7030 kPa (1020 psi)    
32°C (90°F)    
7160 kPa (1039 psi)    
38°C (100°F)    
7290 kPa (1058 psi)    
43°C (110°F)    
7420 kPa (1077 psi)    
49°C (120°F)    
7550 kPa (1096 psi)    
Illustration 9 g00643434
Nitrogen Charging Equipment (35) Nipple. (36) Coupling assembly. (37) Pressure gauge. (38) Hose assembly. (39) Coupling assembly. (40) Nipple. (41) Valve. (42) Pressure gauge. (43) Regulator assembly. (44) Pressure regulating screw. (45) Chuck for the nitrogen cylinder valve. (46) Valve handle. (47) Chuck. (48) Hose assembly.
Illustration 10 g00643435
Brake Accumulator (49) Cover. (50) Cap.
Remove cover (49) from the brake accumulator. Remove cap (50) from the valve assembly on the brake accumulator.
Use a 0 to 13800 kPa (0 to 2000 psi) pressure gauge (42) to check the nitrogen charge in the brake accumulator.
Install chuck (47) onto the nitrogen charging valve for the brake accumulator.
Open valve (41) and charge line (48) to the correct precharge.