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MAINTENANCE
Crusader
MC-8
[~h-GE===4=-4=1===--oA_,r_N_ov_em_be_r,_1_97_4_]
MANUAL
provides unusual tone carrying qualities.
MAINTENANCE
Every 10,000 miles, remove strainer in bottom of
horn valve and clean thoroughly with cleaning
solvent. Remove dirt screens in the horn bells and
clean.
Every 50,000 miles, disassemble the air horn and
clean all parts. Disassemble the air horn valve and
clean all parts.
With air pressure in the system, operate the horn
valve and the horn should give a loud, clear dual
tone horn blast.
With horn valve in the released position, leakage at
the delivery p'ort or at the valve stem at the top of the
horn valve should not exceed a one-inch soap bubble
in one second. With the horn valve applied, leakage
at the stem at the top of the horn valve should not ex-
ceed a one-inch soap bubble in one second.
DISASSEMBLY AND REPAIR
Remove the eight nuts and bolts holding the two
covers to the body. Remove the diaphragms from the
body of the air horn. Remove the spring contact,
springs, and spring assemblies from the covers of air
horn. Remove the horn bells from the body.
CLEANING AND INSPECTION
Wash all metal parts in cleaning solvent. Carefully.
inspect the diaphrag1ns to be sure they are not
cracked, deteriorated, or distorted in any way.
If
ridges or cracks are found, the diaphragms must be
replaced. Inspect condition of the body. Be sure
diaphragm seat in body is not chipped or damaged in
any way. Check for cracks in the body.
If
these con-
ditions prevail, replace covers. Inspect the horn bells.
If they are cracked or broken, they should be
replaced. Inspect the spring contacts.
If
distorted or
deteriorated, they should be replaced. Check the
spring.
If
broken, replace.
REASSEMBLY
Place the diaphragms in the body. Install the spring
contacts, springs, and spring assemblies to the covers.
Install the eight bolts and nuts, attaching cover to the
body. Care should be used to be sure equal pressure
is exerted on all screws holding the cover to the body.
Assemble the horn bells to the body.
TEST OF REBUILT AIR HORN
Both operating test and leakage test must be made
after rebuilding or repairing an air horn.
If
air horn
does not operate satisfactorily, adjustment of the
spring load behind the diaphragm can be made by
turning the adjusting screw in the cover. Before at-
tempting to turn the adjusting screw loosen the ad-
justmg screw lock nut. Be sure to tighten the ad-
justing screw lock nut after any adjustment.
ALCOHOL EVAPORATOR
(OPTIONAL)
DESCRIPTION
The purpose of the alcohol evaporator is to permit
vaporized alcohol to be drawn into the air brake
system and thus guard against freezing of moisture in
the brake. system during cold weather operation.
The device consists of a casting forming a support
for a reservoir for ordinary methyl alcohol, which in
a vaporized state, is drawn into the system.
OPERATION
While the Compressor is compressing air, a fartial
vacuum
is present
in
the Compressor
ntake
Manifold.
The alcohol evaporator is connected to the com-
pressor intake manifold, therefore a partial vacuum is
also created above the alcohol in the jar. Atmosphere
then passes through the Air Strainer, through the
cored passage in the cover, down the tube leading to
the bottom of the jar, and then bubbles up through
1. Line-· /,ir (crq.•;essor
ro
Alcohol
Evaporator
2. Check
Valve
3. Al coho I Evaporator Jar
4. Filler Plug
Figure 4-31: Alcohol Evaporator
lnstol led
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