PC PASSENGER-BRAKE EQUIPMENT 317 



cleaned and the walls lightly lubricated with a good grade of 

 valve oil. The piston and piston ring should be cleaned and 

 the ring lubricated with a little valve oil of good quality, a few 

 drops of the oil being applied to the packing leather. 



Emergency Portion. To lubricate the emergency portion of 

 the control valve, remove the parts and thoroughly clean the 

 bearing surfaces; rub in the parts, using oil for the purpose, 

 and thoroughly clean off all oil and grease; then lubricate the 

 bearing surfaces with graphite. Remove the top cover and 

 take out the loose-fitting cylinder bushing; lubricate the large 

 piston with a few drops of a good grade of triple-valve oil and 

 apply the slide valve to the portion; lubricate the stop-bushing 

 for the small emergency bushing, applying a few drops of oil 

 to its inner surface; then replace the bushing and bolt on the 

 top cover. Move the slide valve to release position and apply 

 a few drops of good triple-valve oil to the walls of the large 

 cylinder bushing, and then move the piston back and forth 

 several times to distribute the oil properly. Replace the large 

 cover of the emergency portion. 



Quick-Action Portion. Only the quick-action closing-valve 

 piston 131 and the cylinder bushing of the quick-action portion 

 require lubrication. Just a few drops of oil are sufficient; the 

 piston, however, should be worked back and forth several times 

 to distribute the oil properly and to make sure that it moves 

 as freely as it should. 



