90-852396 MAY 1996
PUMP UNIT - 5-1
General Information
NOTE: Due to running changes, some illustrations
may not be exactly the same as your drive unit. Ser-
vice procedures remain the same unless otherwise
noted.
Principles of Operation
The jet pump operates by drawing water into a
housing forward of the impeller. The water is pres-
surized within the specially designed housing and
then directed to the rear to provide thrust and mo-
tion.
a
b
c
54898
a - Forward Motion
b - Water Thrust
c - Reverse Gate
(Shown In the Forward
Position)
The jet pump is equipped with a steerable nozzle
(rudder) at the aft end of the pump housing that di-
rects the thrust of water. The jet of water can be di-
rected right or left when the operator turns the steer-
ing wheel in the respective direction. When the op-
erator turns the steering wheel to the right, for exam-
ple, the nozzle turns to the right and the jet force
from the nozzle pushes the stern of the boat to the
left causing the bow of the boat to turn right.
Forward and reverse drive and the neutral position
are achieved by the position of a reverse gate lo-
cated just aft of the nozzle. Forward drive has the
reverse gate clearing the nozzle to allow all the
thrust to be directed straight back. Reverse drive
has the reverse gate covering the entire opening
enough to divert the thrust forward. Neutral position
has the reverse gate covering 75 percent of the
nozzle to direct the water stream forward and down-
ward, as well as backward. The shift position is con-
trolled at the control box in the boat.
a
54896
a - Reverse Gate (Shown In the Reverse Position)
Summary of Contents for 91-809957A1
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