TROUBLESHOOTING
SERVICE MANUAL NUMBER 28
90-863160 MAY 2000 Page 1C-11
Compact Hydraulic Steering
Important Information
Whenever a troubleshooting solution calls for removal from vessel and/or dismantling of
steering system components, such work must be carried out by a qualified marine
mechanic. The following is offered as a guide only and neither Mercury MerCruiser nor the
helm manufacturer are responsible for any consequences resulting from incorrect repairs.
Most faults occur when the installation instructions are not followed and usually show up
immediately upon filling the system. The most common faults encountered and their likely
cause and solution are provided in the following.
Sometimes when returning the steering wheel from a locked position, a slight resistance
may be felt and a clicking noise may be heard. This should not be mistaken as a fault, as
it is a completely normal situation caused by the releasing of the lockspool in the system.
WARNING
Avoid serious injury or death due to FIRE or EXPLOSION. Be sure that engine com-
partment is well ventilated and that no gasoline vapors are present to prevent the
possibility of a FIRE or EXPLOSION.
Helm Becomes Jammed During Filling
Cause Special Instructions
Blockage in the line between the helm(s)
and the cylinder(s).
Make certain that hoses were not kinked
or pinched during installation. If so, the
hose must be removed and replaced.
System Difficult To Fill
Cause Special Instructions
Air in system. Review filling instructions.
Steering Hard To Turn
Cause Special Instructions
Steering cylinder pivot bushings are too
tight or trunion is bent, causing
mechanical binding.
To test, disconnect clevis from steering
lever and turn the steering wheel. If it now
turns easy, correct cause of mechanical
binding. Please note that excessively
loose connections to steering cylinder or
steering lever can also cause mechanical
binding.
Restrictions in hoses. Find restrictions and correct.
Air in hydraulic fluid. See filling and purging instructions.
Wrong hydraulic fluid has been used to fill
steering system.
Drain system and fill with approved
hydraulic fluid.
Helm Unit Bumpy - Requires Too Many Turns
Cause Special Instructions
Dirt in inlet check of helm pump. Replace helm unit.
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