Page 7 - Technical Guide

P roSteering®

Identifying
the
gear
components

• Pressure
and
return
ports:

The
connection
points
for
the
hydraulic
lines
to
and

from
the
power
steering
pump.

Typically,
one
of
the
ports
will
have
an

embossed
letter
in
the
casting.

P
–
for
the
pressure
port
or
R
–
for
the
return

port.

• Valve
housing:

This
casting
is
bolted
on
to
the
cylinder
bore
of
the
gear

housing
and
contains
the
mechanical
valve
of
the
steering
gear.

• Gear
housing.

This
is
the
main
casting
of
the
steering
gear
and
contains
the

rack
piston
and
output
shaft.

• ID
pad.

On
TRW
type
gears
the
gear
part
number
is
stamped
on
this
machined

surface.

• Auxiliary
port.

Some
gears
are
equipped
with
4
lines
to
provide
hydraulic

assist
from
the
master
gear
to
an
auxiliary
gear
mounted
on
the
opposite
frame

rail.

If
you
have
a
4
line
gear
one
of
the
auxiliary
ports
is
on
this
end
of
the
gear

housing
or
in
the
‘bowl’
of
the
gear
housing
around
the
output
shaft.

150416_TECHNICAL
GUIDE
7