MAIN AIR RESERVOIR SAFETY VALVE
This task covers:
Tool kit SC4940-97-CL-E12
Antiseize tape (Item 35, Appendix B)
· Whenever the cutout cock and strainer is removed and installed for any reason, a stationary vehicle
airbrake test (para 2-9) must be performed to check that the cutout cock and strainer function
properly in the brake equipment arrangement. Failure to perform test may result in injury to
· Make sure air is drained before removal of the cutout cock and strainer. Residual air may escape
and cause injury to personnel.
When removing or repairing brake valves or components, check air lines and pipes for corrosion,
breaks, splits, or lose connections. Repair of air lines and piping consists of replacing defective
pipes, lines, and connections. Refer to TM 55-2210-224-24P for identification of piping.
Start locomotive and let air pressure build up. Monitor main air pressure gage.
Close shutoff valve to governor. Main air should start to rise from 130 psi (896 kPa). When it reaches 150 psi (1
034) safety valve should blow. If the safety valve is adjusted incorrectly, refer to steps 5 thru 7 below.
Shut down locomotive.