Quantcast Semitrailers M270 and M269 (fig. 12).

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move O-ring gasket from its seat in valve mounting
bracket.
(2) lnstallation. Position O-ring gasket in its seat in valve
mounting bracket.
Position emergency relay valve on
studs of valve mounting bracket and secure with three
3/8-inch
lockwashers
and
3/8-inch
hex
nuts.
Connect
four
hose
assemblies
leading
to
brake
air
chambers,
and emergency and service air lines to elbows in emer-
Make  operating  test  and  leakage
gency relay valve.
tests (b and c above).
61. Air Reservoir
a.
of
Moisture
from
Air
Reservoir.
Open
drain
Close cock after draining.
cock
13)
on
air
reservoir.
b. Test and Check for Serviceability. With
air
brake
sys-
tem connected (par. 31b(3)), coat drain cock, pipe plugs, con-
nections
between
emergency
relay
valve
and
air
reservoir,
con-
nector attaching air line to air reservoir, and outside of air
No leakage is per-
reservoir (figs. 12 and 13) with soapsuds.
missible.
Tighten  any  leaking  connection.  Inspect  for
damage
Replace  reservoir  if  it  leaks  or  if  any
damage
or corrosion.
or corrosion is found that would weaken reservoir.
c.
Semitrailer
M270A1
13).
Caution: Before attempting to remove components of air lines,
release air pressure from system by opening drain cock on air
reservoir.
(1) R e m o v a l . Disconnect
connector
of
air
line
leading
to
emergency
relay
valve.
Remove
square-head
bolt,
lock-
washer and hex nut from each clamp which mounts air
Remove
reservoir to chassis frame longtiudinal beam.
t w o cap screws, lockwashers, and hex nuts which secure
each lower clamp to chassis frame longitudinal beam.
Remove clamps and reservoir.
(2) Installation.
Position
air
reservoir,
drain
cock
down
and connection end to rear of semitrailer, against upper
clamps secured to chassis  frame  longitudinal  beam.
Position two lower clamps under reservoir and against
beam
and
secure
with
two
38
x
1
cap
screws,  3/8-
Lock upper
inch lockwashers, and 38-inch hex nuts.
a n d l o w e r c l a m p s w i t h t w o 3 / 8 x 5
square-head
bolts,
inserted
upward
through
lower
clamp,
and  two  38-
Position  air
inch
lockwashers
and
3/8-inch
hex
nuts.
line leading to emergency relay valve on air I'eser-
TAGO 1321B
98



 


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