Operation
Given the importance of this locking mechanism, it is critical that you understand how it operates, and 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 2. You
will know you have fully and correctly selected the number 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engaged the rotational assembly when the unit was withdrawn from the base.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 adjustment knob on one side to a position that is between the numbers 2 and 3. 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 normally.
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 2 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 mechanism. We suggest you repeat this test monthly to make sure that the locking
mechanism operates correctly.
Do not engage the locking mechanism and use the handle to try to lift the dumbbell and base together. To lift the
dumbbell and base together, engage the locking mechanism and use the lift handles molded into the base assembly.
If the dumbbell locking mechanism operates unsatisfactorily in the test procedure above, do the following:
1. Stop use of the product immediately until approved service is available.
2. Contact your Bowflex
®
retailer for service.
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