Power Steering; Poor, Erratic Or No Assist - Mercury MerCruiser MCM 454 Mag MPI Service Manual

SERVICE MANUAL NUMBER 23

Power Steering

Poor, Erratic, or No Assist
Drive belt
Low fluid level
Air in system
Leaking hoses
Steering cables and/or steering helm
Binding in stern drive unit
Restriction in hydraulic hoses
Control valve not positioned properly, not
balanced properly, or the mounting nut is
loose
Mounting bracket adjusting screw loose or
mounting tube is loose
Faulty pump
Worn piston ring or scored housing bore in
cylinder.
Leaking valve body or loose fitting spool
Index Index
90-861326--1 MARCH 1999
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Cause Special Information
Worn, broken or out of adjustment
Air leak in lines, pump, or air from
installation. Refer to SECTION 9A for
bleeding procedure.
Refer to SECTION 9A for bleeding proce-
dure.
Cable or helm partially frozen from rust or
corrosion; cable over-lubricated; improper
cable installation.
Refer to appropriate Sterndrive Service
Manual
Causes a loss of pressure
Flow control valve may be sticking
Causes loss of pressure
TROUBLESHOOTING
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