4
K300 – HOW IT WORKS
Two basic systems are used to operate the KEISER 300 series exercise machines.
On machines that exercise the muscle groups of the upper body, the resistance is
controlled by means of foot pedals mounted on the base of the machine. Thumb buttons
in the handles operates machines for lower body muscle groups.
When the quick-disconnect is plugged into the air system, compressed air flows
into the machine. In all but the Seated Chest Press, Lateral Shoulder Raise, Military
Press, Tricep, and Seated Butterfly, the air flows through the filter to the increase valve
(in the machine above, the filter is in a different location, but its function is identical).
The filter removes moisture and particles, which may be harmful to the cylinders.
When the increase valve is depressed, the air flows into the cylinders, tanks, and
gauge through one or more manifolds. Moving the exercise arm through its range drives
the piston in the cylinder against the air pressure. The air, in effect, pushes back against
the piston, creating mechanical resistance. When the increase valve is held down, the
resistance becomes greater until the maximum cylinder pressure is reached.
Depressing the decrease valve opens the system to the atmosphere, allowing the
cylinder air to escape. The resistance decreases as the pressure is reduced.
The gauge is calibrated to show the maximum amount of resistance developed by
the machine. The gauge reading is correct when the exercise arms are against their stops.
The gauge needle will move during the exercise motion. This is characteristic of the
system and does not indicate a malfunction.
Summary of Contents for Keiser 300
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