1997 HONDA CIVIC Workshop Manual

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Page 1073 of 2189

HONDA CIVIC 1997 6.G Workshop Manual )
Steering Pump
Construction
The pump is a vane-type incorporating a flow control valve (with an integrated relief valve) and is driven by a POLY-V-belt
from the crank pulley. The pump features 10 van

Page 1074 of 2189

HONDA CIVIC 1997 6.G Workshop Manual System Description
Steering Pump (contdl
The flow control valve and sub-valve in the pump per-
forms the following steps @ through @ to control the
flow of fluid, that is to increase the discharge vo

System Description
Steering Pump (cont'dl
The flow control valve and sub-valve in the pump per-
forms the following steps @ through @ to control the
flow of fluid, that is to increase the discharge volume
when engine speed is low, and to decrease it when the
engine speed increases. The assistance thrust of the
steering gearbox changes in compliance with the
change in the discharge volume.
When the engine starts, fluid discharged from the
discharge port starts to flow through oil passage A,
the fixed orifice and the variable orifice to the steer-
ing gearbox. When the engine speed is extremely
low, the return port is closed by the flow control
Fluid pressure discharged from the discharge port
is applied to the top of the sub-valve, and the fluid
pressure that passed through oil passage A is applied
to the bottom of the sub-valve. When this happens,
the pressure difference between the ends of oil pas-
sage A, which is caused by the resistance oil passage
A when the fluid flows through the passage. is
applied to the sub-valve, However, the pressure dif-
ference applied to the sub-valve. that is the force
that pushes the sub-valve down, is too small to
overcome the spring force, and the variable orifice is
fully open when the engine speed is extremely low.
Because the fluid volume flowing through the fixed
orifice and variable orifice increases, a pressure dif-
terence is created between the ends of these ori-
fices, and it increases in proportion to the engine
speed. As the fluid pressure that passed the fixed
orifice and variable orifice is directed to the bottom
of the flow control valve. a pressure difference is
created between the top and bottom of the valve,
which pushes down the flow control valve and
opens the return port. As a result, pan of the fluid
discharged from the discharge port feturns to the
pump suction port, keeping the discharge volume
constant.
In this condition, the sub-valve does not move. and
the variable orifice stays fully open.
lo
trrtrrlo3
J
o
PUMP R.P.M.
To STEERING GEARBOXSUB.VALVE
To STEEnING GEARBOX
FLOW CURVE
!rs+/f/ffih\
o,,-i^"l^tKzYt)91y ul3Yl
FLOW CONTNOL VALVE
su8-vALvE
ORIFICE
ToP
17-18
FLOW CONTROL VALVE

Page 1075 of 2189

HONDA CIVIC 1997 6.G Workshop Manual t
To STEERING GEARBOX
To STEERING GEAREOx
@ The fluid volume that flows thorough oil passage A
and the pressure djfference applied to the sub-valve
increase in proportion to the engine speed. The
sub-

Page 1076 of 2189

HONDA CIVIC 1997 6.G Workshop Manual System Description
Steering Gearbox
The rack-and-pinion type steering gearbox has a valve body unit incorporated with the pinion to control the steering fluidpressure. Steering fluid from the pump is

Page 1077 of 2189

HONDA CIVIC 1997 6.G Workshop Manual Pressure Control
Low assist at higher speeds:
WhensteeringresistanceIsIow,suchaswhendrivingathighspeeds,orwhendrivingstraightahead,theinputshaftis
near or in the neutral position, so there is little o

Page 1078 of 2189

HONDA CIVIC 1997 6.G Workshop Manual Troubleshooting
General Troubleshooting
Check the following before you begin:. Has the suspension been modified in a way that would affect steering?. Are tire sizes, tire variety and air pressure corr

Page 1079 of 2189

HONDA CIVIC 1997 6.G Workshop Manual I
AbnormalDeformed
Faulty cylinder lines
Adiustment OK
Faulty valve body unit
Normal
IICompair the steering to another alike
vehicle.
/
Check the force required to turn
the wheel (see Page 17 30i
Star

Page 1080 of 2189

HONDA CIVIC 1997 6.G Workshop Manual Troubleshooting
General Troubleshooting (contd)
Assist (excessively light steering) athigh speed.
Shock or vibration when wheel isturned to {ull lock.
Steering wheelwill not returnsmoothly.
lf the pr

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