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BRAKES-POWER BENDIX
5-1 7
Inspect all parts for wear or damage. Replace worn
or damaged parts with new. Check the inside of the
vacuum cylinder. If cylinder is rusted or corroded,
polish with fine steel wool or crocus cloth. If inspec-
tion reveals nicks or scratches on the piston rod, valve
seat (on end of valve rod) or valve seat (at center of
piston plate) install new parts at assembly as required.
Inspect the leather packing and piston rod leather
seal. If worn excessively, install new parts as required.
Assembly
(1) Using vacuum cylinder oil, saturate the piston
felt and permit the excess oil to drip off.
(2) Place assembly fixture Tool (2-3816 on two wood-
en blocks and insert the leather piston ring in the fix-
ture with the lip side up (Fig. 21).
'
, EXPANDER
NY 1364
Fig. PI-Assembling
Pisfon Ring, Felt and
Expander
(3) Assemble the felt ring into expander and install
the expander and felt in the groove of the rear piston
plate.
(4)
Hold the felt and expander compound in the pis-
ton plate and install the rear piston plate into the
leather piston ring.
(5) Holding the rear piston plate, felt and leather
piston ring into assembly fixture, invert the assem-
bly and place on 2 wooden blocks.
(6) Apply a light coating of lubricant to the valve
plunger and both faces of reaction disc.
(7) Install the reaction disc in the hub of the front
piston (Fig. 2 0 ) .
(8) Insert the eye end of the valve rod through the
hole of the rear piston plate.
(9) Install diaphragm support in the hub of the rear
piston plate.
(10) Place the flat side of the poppet diaphragm
over the flange of the poppet and install the poppet
assembly in the recess of the rear piston plate.
(11) Install the poppet spring retainer over the end
of the poppet and install the valve return spring
and poppet return spring.
(12) Align the front and rear piston plates and in-
stall 6 attaching screws finger tight. Progressively
tighten every other screw lightly until all are tight-
ened to 55 inch-pounds.
(13) Assemble the air cleaner filter over the vacu-
um tube of the air cleaner assembly and attach the
assembly to the end plate and tighten attaching
screws (Fig. 19).
(14) Install the rubber vacuum hose to the inlet
tube of the power piston and align the hose to lay
flat against the piston.
(15) Remove the vacuum piston assembly from the
assembly ring, and coat the inside of the vacuum cyl-
inder and leather packer ring of piston with a thin
coating of vacuum cylinder oil.
(16) Install the end plate over the valve operating
rod of the piston assembly and attach the vacuum
hose to the inlet tube of the air cleaner assembly.
(17) Center the small end of the piston return
spring in the vacuum cylinder.
(18) Align scribe marks of end plate, piston assem-
bly and cylinder, then install piston and end plate,
centering large end of return spring on the piston
assembly.
(19) Compress the spring and install two attaching
screws in the end plate opposite each other.
(20) Install the balance of the attaching screws and
tighten uniformly.
(21) Install the dust cover over the valve rod and
the flange of the end plate.
(22) Install the spring washer between the valve
push rod and power lever linkage, then install the
clevis pin and cotter pin.
(23) With a rotating motion install the large end of
the hydraulic push rod into the hub of the front pis-
ton plate.
(24) Press and rotate the push rod firmly against
the rubber reaction disc to insure the expulsion of
any air pocket between the push rod and disc.
Push Rod Adjustment
Unless the master cylinder push rod has been re-
.placed, no adjustment of the push rod should be
needed. The self locking screw on the end of the push
SCREW
-we/@.
"
NY 13726
Fig. 22-Master
Cylinder Push Rod Heighf Gauge
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