Nautilus Instinct, Owner'S Manual, Page: 9 / 20

NAUTILUS INSTINCT ABDOMINAL / LOWER BACK MACHINE O
WNER
’
S
M
ANUAL
9
5. Install the Weight Belts
NOTE:
The Ab Back Machine uses two weight
belts; one weight belt (31) is attached to the top
plate (29) and the weight stack frame (1), and
one weight belt (32) is attached to a moveable
pulley/clamp combination (27/30) and the
range-of-motion flywheel (4). Each belt is
attached using cinch fasteners (see detail below).
Two people may be required to properly install
and tension the weight belts.
Remove the retaining screws (53) and belt
retainers (45) from the belt clamps on the
weight stack top plate (29), weight stack
frame (1), pulley/clamp combination (27/30)
and range-of-motion flywheel (4).
Insert one end of the weight belt (31) through the slot in the top plate belt clamp until approximately one inch of the free
end of the belt protrudes from the slot in the opposite side of the clamp.
While holding the free end of the belt, press down on the opposite side of the belt so it lays flat against the inside of the
clamp.
Insert the belt retainer (45) into the belt clamp. BE SURE the tapped hole in the belt retainer is aligned with the mating
hole in the belt clamp.
CAUTION:
BE SURE to keep the weight belt straight when installing the retaining screw (53) in the belt
retainer (45). Misalignment of the weight belt may bias the top plate, which can cause excessive contact of
the top plate shaft with the weights, resulting in excessive noise during use, and potential hazards to the
user or other bystanders.
Thread the retaining screw (53) through the belt clamp and into the belt retainer (45). Tighten the retaining screw to
400 inch-pounds.
Route the weight belt (31) over two pulleys (27) (factory installed) and around pulley/clamp combination (27/30), as
illustrated.
Insert the free end of the weight belt (31) through the slot in the weight stack frame belt clamp, and pull through the
opposite slot just until force is applied against the top plate (29). This will eliminate any slack in the belt and ensure
proper tensioning.
While maintaining tension on the weight belt, press down on the free end of the belt so it lays flat against the inside of
the belt clamp.
Insert the belt retainer (45) into the belt clamp. BE SURE the tapped hole in the belt retainer is aligned with the mating
hole in the belt clamp.
Thread the retaining screw (53) through the belt clamp and into the belt retainer (45). Tighten the retaining screw to
400 inch-pounds.
Check for proper tensioning of the weight belt by applying lateral pressure to the belt at a point midway between two
pulleys. Deflection of the weight belt should be less than 25 mm. Loosen the retaining screw (53) and adjust belt tension
as needed.
Insert one end of the weight belt (32) through the slot in the moveable belt clamp until approximately one inch of the
free end of the belt protrudes from the slot in the opposite side of the clamp.
While holding the free end of the belt, press down on the opposite side of the belt so it lays flat against the inside of the clamp.