REGULATOR AS 7E8263 - Caterpillar

Maintenance Section
Storage
Inlet, output, and drive connecting lines may be stored with the booster unit for convenience and ready accessibility, provided that all open ends are plugged or capped to prevent entry of any contaminants. If connecting lines are stored elsewhere, plug or cap all ports on the booster system.Periodic Maintenance
Individual Components. No periodic maintenance is recommended for any other components in the system except the booster drive cycling valve. Therefore all tubing can be left undisturbed removing the risk of contamination from careless handling.
Gas Booster Drive Cycling Valve. This spool valve will require periodic lubrication with light grease, silicone, or moly disulphide base (recommended). It has been designed for easy accessibility.
Frequency of Cycling Spool Lubrication. The user will be guided by experience. Regreasing may be needed once weekly or once annually or somewhere in between depending on the frequency of usage and the condition of the drive air or gas. Presuming the use of clean, dry nitrogen for drive gas, the lube frequency for the cycling spool/O-ring assembly could be often. This is because dry nitrogen tends to carry off all traces of lubrication soon when a significant volume of drive gas has been consumed across this cycling valve.The symptom will be cycling slowdown and erratic operation. The user should note the time elapsed since the previous lubrication of the spool/O-ring assembly. This will enable the user to anticipate the next need for lubrication, which can then be scheduled during a normal off time rather than interrupt the operation of the system while charging accumulators.
Repairs. No components except Item 1 (P-1) booster should require repair or seal replacement over the life of the system unless damaged by accident or contaminated gas.In general, periodic seal replacement without symptoms indicating excessive wear or leakage is not recommended.For Seal Kit replacement part numbers, see Service Repair Parts section.Service Repair Parts
Table 5
Service Repair Parts
Part No. Name
455-0127 Nitrogen Booster Air Seal Kit
455-0129 Nitrogen Booster Gas Seal Kit Frequently Asked Questions
Question: How does nitrogen gas pressure in the accumulator vary with temperature?Gas pressure is variable with temperature. Check the temperature of the air around the accumulator. To check the amount of charge in an accumulator, the accumulator must be at the same temperature as the surrounding air. Refer to Table 6.Note: The temperature of the accumulator may change as the accumulator is being charged due to the expansion or compression of the nitrogen charge. You may need to charge the accumulator in several steps to ensure a correct charge.
Table 6
Charge Pressures and Temperatures
Temperature Pressure
−40°C (−40°F) 13700 kPa (1987 psi)
−35°C (−31°F) 14200 kPa (2060 psi)
−30°C (−22°F) 14600 kPa (2118 psi)
−25°C (−13°F) 15100 kPa (2190 psi)
−20°C (−4°F) 15500 kPa (2248 psi)
−15°C (5°F) 16000 kPa (2321 psi)
−10°C (14°F) 16500 kPa (2393 psi)
−5°C (23°F) 16900 kPa (2451 psi)
0°C (32°F) 17400 kPa (2524 psi)
5°C (41°F) 17800 kPa (2582 psi)
10°C (50°F) 18300 kPa (2654 psi)
15°C (59°F) 18800 kPa (2727 psi)
20°C (68°F) 19200 kPa (2785 psi)
25°C (77°F)