Bowflex SelectTech BD1090 - Manual (Page 6)

4
Understanding and testing the locking
mechanism function
The Bowflex ® SelectTech ® Dumbbell features a patent pending
locking mechanism designed to assure proper and complete
selection of the weight plates as well as to ensure weight plate
retention during the workout.
Fully understand the function of this mechanism and do
tests of the mechanism regularly to make sure it
operates correctly.
Function
The locking mechanism provides two key functions:
1. The mechanism will only allow the adjustment knobs to be
rotated when the dumbbell handle is completely inserted
and engaging the dumbbell base.
2. The mechanism is designed to lock the dumbbell
handle to the base if either adjustment knob is not fully
engaging the selected weight plates.
Purpose
The locking mechanism serves two important purposes:
1. The mechanism will prevent deselecting (dropping)
weight plates from the dumbbell when it is NOT in the
dumbbell base.
2. The mechanism will prevent partial selection of
the weight plates in which the plates are not fully
supported and the locking pin is not fully engaged.
Given the importance of this locking mechanism, it is
critical that you understand how it operates and how to
periodically test it to make sure it is functioning correctly.
Testing proper locking mechanism function
1. With the dumbbell handle set
in the dumbbell base, turn both
adjustment knobs to the number
10. You will know you have fully
and correctly selected the num-
ber when you feel the adjustment
knob settle into a notch (known
as a detent). You will also hear a
slight, but audible, clicking noise
that corresponds with the detent
locations for each number.
2. You should be able to withdraw the handle from the
base leaving all the weight plates behind.
3. With the handle removed from the base, grab one
adjustment knob with your other hand and gently
attempt to turn the knob. The knob should not rotate.
A locking pin in the mechanism will have engaged the
rotational assembly when the unit was withdrawn from
the base. Perform this test with all adjustment knobs.
Do not use too much force to try to turn the locked
adjustment knob. Too much force can damage the locking
mechanism.
4. After confirming the proper function of the locking
mechanism as described above, return and fully insert
the dumbbell handle back into the base
assembly.
5. With the handle back in the base, turn the adjust-
ment knob on one side to a position that is in-between
the 10 and 15 number. This represents an incomplete
weight selection where the adjustment knob has not
fully selected a weight and the knob is in-between the
selection detents (clicks).
6. With the selection knob in this
improper position, gently attempt
to lift up on the handle to remove
it from the base. You should find
that the handle is locked to the
base and cannot be removed
with light pressure as it can nor-
mally.
7. Return the improperly selected adjustment knob to a
full and proper weight selection and assure that the
dumbbell handle can once again be removed.
8. Repeat this test for all adjustment knobs.
9. Assure the entire dumbbell handle assembly is properly
tightened. Do this by setting the adjustment knobs to
10 pounds and removing the handle assembly from the
base. Grab both adjustment knobs and very slightly
push and pull the knobs toward and away from the
handle grip. The knobs should not exhibit free play and
all of the selection discs should feel tightly connected.
10. You have now tested the function of the locking mecha-
nism. We suggest you repeat this test periodically
(once a month) to confirm the proper function of the
locking mechanism.