PLATE 4622493 - Caterpillar

4. Install 3J1907 Seal (20) on 6V3965 Nipple Assembly (21).
High pressure nitrogen is present. Injury to personnel is possible. Make sure the lock pin is installed in the cylinder.
5. If the gauge indicates pressure the cylinder may still have pressure or the gauge may be defective. If flag seal (5) is broken or if lock pin (4) is missing, the cylinder is probably empty.6. Carefully remove plug (6), knob (7) and plunger (8) as a unit from 7T9964 Valve Body (9). Check parts for defects. Replace defective parts with new parts.7. Check in the bore of the valve body and observe 3T9384 Burst Disc Plug Assembly (10) at the bottom of the bore.* If the disc is ruptured, the cylinder is empty. If the gauge shows pressure, the gauge is defective and must be replaced. Tighten the new gauge to 13 2 N m (9.6 2 lb ft).* If the disc is not ruptured, the actuator may still have pressure.
6V7906 Plug Wrench8. If the actuator has no pressure, install 6V7906 Plug Wrench (22) into the valve body bore, engaging the wrench to 3T9384 Burst Disc Plug Assembly (10).9. Remove the burst disc plug assembly by turning the wrench counterclockwise.10. Carefully clean the threads to be sure that there are no burrs left after removal of the plug assembly. This is to prevent these particles being expelled from the cylinder during discharging of the actuator.11. Add 5 mL (1 tsp) of Halon 2402 into the valve body to provide leak detection tracer. Do not spill any Halon 2402 on the plug assembly threads. Remember to always add 5 mL (1 tsp) of Halon 2402 whenever the actuator is discharged.12. Install a new 3T9384 Burst Disc Plug Assembly (10) into the actuator valve body using 6V7906 Plug Wrench (22).13. Tighten the plug assembly finger tight, then back off one to one and one half turns, leaving the plug wrench in place.14. Remove 127950 Plug (11) from the outlet port of the valve body.15. Install 6V3965 Nipple Assembly (21) in the outlet port.
(23) Gauge. (24) Input. (25) Gauge. (26) Screw. (27) Valve. (28) Valve. (29) Coupler.16. Close valves (27) and (28).17. Connect hose end with coupler (29) to 6V3965 Nipple Assembly (21).18. Connect regulator input (24) to a source of dry nitrogen.
Dry nitrogen is the only gas approved for use in the actuator cylinder. Charging the actuator cylinder with oxygen gas may cause an explosion. This hazard will not happen if nitrogen cylinders with standard CGA (Compressed Gas Association, Inc.) Number 580 connections are used.When you order nitrogen gas, be sure that the cylinders are equipped with CGA No. 580 Connections. Do not use color codes or different methods of identification to tell the difference between nitrogen and oxygen cylinders.
19. Adjust screw (26) until gauge (23) reads approximately 4133 kPa (599 psi). Gas pressure is variable with temperature. The cylinder must be at the same temperature as the air around it before it can be charged. Use the following