ECR
4873
Rev
B
H13748.doc
Installation Instructions
MODEL
857
For
vehicles
with
air
brakes
1.
Horn
should
be
mounted
on
top
of
cab
and
tilted
slightly
downward
for
best
sound
projection.
2.
If
cab
is
equipped
with
roof
trim
panel,
remove
to
install
horn.
3.
Drill
1/2”
and
9/32”
holes
(using
gasket
for
a
template)
in
position
desired
for
horn
base.
Locate
position
for
front
support
and
drill
9/32”
holes.
4.
Place
gasket
between
base
of
horn
and
top
of
cab
roof
and
secure
to
roof
with
2
screws,
2
lock
washers,
and
2
nuts.
5.
Place
gasket
between
base
of
support
and
top
of
cab
roof
and
secure
to
roof
with
2
screws,
2
lock
washers,
and
2
nuts.
6.
Assemble
lanyard
valve
and
curved
tension
washer
to
horn.
7.
Connect
tubing
from
air
supply
to
inlet
on
manual
lanyard
valve.
8.
Punch
hole
in
trim
panel
for
valve
lanyard.
Lace
lanyard
through
panel.
Replace
panel,
fasten
lanyard
to
convenient
trim
screw.
(not
included)
CAUTION: check local noise abatement ordinances to avoid legal violations.
Important
–
Use
pipe
compound
on
pipe
threads
to
assure
air
tight
connections
All Hadley products carry a limited warranty for 12 months from the date of purchase. We will repair or
replace, at our option, defects in material and workmanship during that period when product is returned to
our service department at the address below.
Hadley
Attn: Warranty Dept
2851 Prairie Street
Grandville MI, 49418
Service Department: (616) 249-8462
Hadley Main: (616) 530-1717
Fax: (616) 530-3283
www.hadley-products.com
