Gemini 105Mc Owner’s Manual
25Copyright © 2004 Performance Cruising Inc.
the boat is in particularly choppy water, take care
to lower the leg slowly as there may not be enough
water to fully cushion the leg when dropping into
place.
The sonic drive leg includes a metal claw that goes
over the thrust bar. The claw is held down by an
inverted "L" shaped lever and allows the engine to
reverse without coming up. A knob in the starboard
cockpit locker pulls the “L” lever forward. Once
this lever is moved forward the claw can move up
off the thrust bar and the whole drive leg can be
raised out of the water.
In lowering the leg to prepare for use, the claw
pushes the spring loaded inverted "L" lever out of
the way so that the claw can go over the 7/16"
thrust bar. The spring loaded "L" lever then clips
back over the claw preventing the sonic drive leg
from rising while in use.
As part of the standard maintenance schedule, be
sure to keep the claw and “L” lever well coated
with marine-grade grease for proper operation.
Should there ever be a problem raising the drive
leg, the lock claw can be opened manually by press-
ing down on the lever with a boat hook and then
raising the leg as usual. Be sure to then thoroughly
grease the claw to regain proper operation.
Raising the Leg
1. Place the small red lever next to pump handle
in the horizontal position, in line with the flow
of hydraulic oil.
2. The black knob must be tightened or closed.
3. Pull out silver reverse lock knob on back wall of
locker.
4. Pump handle to begin raising the leg – you may
release the silver lock knob after leg begins to
rise.
5. Turn the small red lever vertical - this will lock
the leg up in case of a leak in the pump seal.
Lowering the Leg
1. Turn the small red lever to the horizontal posi-
tion, in line with the hydraulic line.
2. Loosen the black knob on the pump and the leg
will drop into place. You should hear it lock
into place.
3. If the boat is still moving forward as the leg is
lowered, it likely will not lock into position as
Engine and Drive Leg
it drags through the water. In this case, with
the engine running slowly move the throttle
forward and out of neutral. As the prop en-
gages, you will hear the “click” as the leg locks
into place.
Steering the Drive Leg
With the drive leg in the “down” position, lines from
the 8-inch tiller on the rudders go tight to the pad
eye on the top of the drive leg. The drive leg is then
steered in line with the rudders. With this configu-
ration, you are directing the thrust in the same di-
rection as your rudders which provides for a very
responsive, maneuverable boat.
Specific instructions for how to remove and replace
the oil drain plug on the leg are included in the
addendum of this manual—refer to the back of this
manual.
MK II Cat Spare Kit Available for Order from Perform-
ance Cruising includes:
$186.00 + Shipping (Check Only)
(1) CVJ gaiter
(2) Pair Prop Seals
(1) Transom Oil Seal
(1) 17-spline tab washer
(1) ¾ x ¾ DU bush
(2) ¾ x ½ DU bush
(1) Grease Nipple
(1) Latch Spring
(2) 7/16 A2 washers
(1) Drain Plug
(1) Transom Anode
(1) Prop Shaft Anode
(2) 1/8 split pin
(2) 3/32 split pin
(2) ¼ UNC x ½ SKT cap
(2) ¼ UNC x ¾ SKT cap
(2) ¼ UNC x 1” SKT cap
(2) 5/16 UNC x ¾” SKT set
(1) Loctite and Instant Gasket
(1) Keenol Grease
(1) Spare Parts Price List
(1) Sheet of Reminders for Gemini Owners
Send check or money order with a reference to the Drive
Leg Spare Parts Kit to:
Performance Cruising Inc.
7364 Edgewood Road
Annapolis MD 21403
Propeller Specifications
15” Diameter / 11” Pitch
17 Spline Drive
3 Blade Aluminum— Left Hand
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