342 BRAKE CYLINDERS 



light weight of which exceeds 37,000 lb., but the construction 

 of which prevents the application of the type C brake. The 

 total leverage should never exceed 9 to 1. The connection 

 between the auxiliary reservoir and brake cylinder should be 

 as short as possible; if piping exceeds 8 or 10 ft., the braking 

 effect is likely to be noticeably impaired. The piece number 

 of the freight-brake cylinder, with plain pressure head, com- 

 plete, is 4,868; of type D freight auxiliary reservoir, complete, 

 is 24,446. The piece and reference numbers of the various 

 parts are given in the accompanying list. 



PC. No. Ref. No. Name of Part 



1.250 2 Cylinder body, 10 in. X 12 in. 



1.251 3 Piston and rod, includes 5 only. 

 1,104 4 Non-pressure head. 



2,305 5 Follower stud and nut. 



1,108 6 Follower. 



1.111 7 Packing leather. 



1.112 8 Packing expander. 

 1,110 9 Release spring. 

 1,114 10 Cylinder gasket. 



4,883 11 Cylinder-head bolt and nut. 



4,887 12 Reservoir stud and nut. 



24,446 13 Detached reservoir, includes 12, 14, and 16. 



1,004 14 Drain plug. 



*4,886 15 Triple-valve gasket. 



4,906 16 Reservoir tube. 



4,869 18 Pressure head. 



CLEANING THE BRAKE CYLINDER 



The non-pressure head and the piston should be removed 

 from the brake cylinder and the cylinder cleaned with kerosene 

 and waste to remove all the gum and dirt so that the walls 

 will have a smooth surface. The leakage groove should be 

 scraped out clean and the walls of the cylinder rubbed with 

 waste saturated with kerosene. If there are any rough or 

 rusty spots left, they should be smoothed with fine sandpaper; 

 then all traces of the kerosene and dirt removed and the wall 

 of the cylinder thoroughly covered with heavy grease provided 

 for that purpose, rubbing it on well with the hand gives the 

 best results. When cleaning the brake piston, take out the 



*Listed for convenience only, not included in Piece No. 

 24,446. 



