TM 55-203
the strainer into proper position. Make sure of its inner
(6) Thoroughly clean the brake cylinder by first
engagement with sealing bead (if inserted properly, all
using a dull rounded scraper for removal of all grease
nut threads will be visible). Apply its holding nut and
and dirt. Use solvent, if necessary, to soften gummy
tighten it firmly.
deposits and remove rust spots, then wipe dry and clean
(2) With the service portion gasket in place on
with a lint-free cloth.
the pipe bracket and fully seated in its locking
Do not use cotton waste.
projection, remove the shipping cover from the clean
service portion. With the piston in release position,
immediately mount the portion, sliding it slowly and
Note. After cylinder is cleaned, it should be covered to
carefully on the studs against the pipe bracket. Coat the
protect it from dust and dirt unless the piston and
stud threads with graphite grease and tighten the
nonpressure head assembly is to be immediately
holding nuts evenly and then firmly.
installed. The lubricant must be applied to the cylinder
(3) Connect the brake cylinder release rod to
just before the cleaned and lubricated piston is applied.
the release valve handle.
i. Install Reconditioned Emergency Portion
(7) Using a suitable brush, coat the cylinder
(1) With the emergency portion gasket in place
wall thoroughly with a thin layer of brake cylinder
on the pipe bracket and fully seated in its locking
lubricant. Place the nonpressure head gasket in correct
projection, remove the shipping cover from the clean
position in the recess on the cylinder flange. Remove
emergency portion Examine the emergency piston to
the shipping cover from the piston assembly. Coat the
insure it is in release position. Damage to the piston
cylinder wall bearing surface of the packing cup and fill
and bush will result if the piston is out of the bush while
the grease groove of the swab retainer with brake
the portion is mounted on the pipe bracket.
cylinder lubricant. Insert the piston assembly in the
(2) Mount the portion, sliding it slowly and
brake cylinder as follows:
carefully on the studs against the pipe bracket. Coat the
(a) Stand the piston assembly on end with the
stud threads with graphite grease and tighten the
nonpressure end down.
holding nuts evenly and then firmly.
(b) With the piston in this position, enter it into the
(3) Remove the vent protector plug and apply
cylinder. Slowly raise the nonpressure head until the
and securely tighten a serviceable vent protector to the
upper portion of the packing cup engages in the cylinder
clean emergency portion.
wall. Shove the piston back into the cylinder.
j. Install Reconditioned Retaining Valve. Install
(c) Apply nonpressure head bolts and tighten
evenly and then securely.
retaining valve in reverse of removal (e, above). Make
(d) Apply push rod and connect it to brake lever
sure the valve is securely fastened to the car in a
with brake lever pin and secure with cotter key.
vertical position and that the handle moves freely (para
Clean and Lubricate Truck-Mounted Brake Cylinders
k. Clean and Lubricate Frame-Mounted Brake
(1) Remove cotter pin and anchor pin from the
piston rod and release the rod from the yoke.
Cylinders
(2) Remove capscrews that secure the air line
(1) Disconnect brake lever and remove
adapters to the cylinder and separate the adapters from
brake cylinder push rod.
the cylinder. Remove the gaskets.
(2) To avoid personal injury, examine the
(3) Remove locknuts, nuts, and bolts that secure
hollow rod collar on end of piston to determine if it will
the brake cylinder to the truck bolster. Remove the
hold securely.
cylinder assembly and transport the assembly to the
(3) Remove the pressure head bolts and then
airbrake shop for reconditioning (para 8-18).
remove the piston, release spring and nonpressure head
(4) Using new gaskets, install the brake cylinder in
complete.
reverse of removal.
(4) Apply a shipping cap to the nonpressure
m. Inspect Brake Rigging
head. This will protect the piston packing cup, lubricator
(1) Check all brake levers and rods to insure
swab assembly, and other parts against damage and
that they conform to the standard dimensions shown on
contact with dirt when transporting the assembly to the
the metal badge plate attached to car. Wrong brake
airbrake shop for reconditioning (para 8-18).
levers or brake rods shall be replaced with standard to
(5) If the nonpressure head gasket is in suitable
car except where brake
condition to provide a tight seal, replacement is not
required. If damaged, remove gasket, clean its seat
when cleaning the brake cylinder and apply new gasket.
8-18
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