Pro-Form TRAINER 420 User Manual page 20

Treadmill exerciser
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Locate the Reed Switch (89) and the Magnet (62) on
the left side of the Pulley (71). Turn the Pulley until the
Magnet is aligned with the Reed Switch. Make sure
that the gap between the Magnet and the Reed
Switch is about 1/8 in. (3 mm). If necessary, loosen
the M4.2 x 13mm Tek Screw (3), move the Reed
Switch slightly, and then retighten the Screw.
Reattach the Hood (not shown), and run the treadmill
for a few minutes to check for a correct speed reading.
PROBLEM: The walking belt slows when walked on
SOLUTION: a. Use only a single-outlet surge suppressor that meets all of the specifications described on page 12.
b. If the walking belt is overtightened, treadmill perfor-
mance may decrease and the walking belt may be-
come damaged. Remove the key and UNPLUG THE
POWER CORD. Using the hex key, turn both rear
roller bolts counterclockwise, 1/4 of a turn. When the
walking belt is properly tightened, you should be able
to lift each edge of the walking belt 2 to 3 in. (5 to 7
cm) off the walking platform. Be careful to keep the
walking belt centered. Then, plug in the power cord,
insert the key, and run the treadmill for a few min-
utes. Repeat until the walking belt is properly tight-
ened.
c. If the walking belt still slows when walked on, please see the back cover of this manual.
PROBLEM: The walking belt is off-center or slips when walked on
SOLUTION: a. If the walking belt has shifted to the left, first re-
move the key and UNPLUG THE POWER CORD.
Using the hex key, turn the left rear roller bolt clock-
wise 1/2 of a turn. Be careful not to overtighten the
walking belt. If the walking belt has shifted to the
right, turn the left rear roller bolt counterclockwise 1/2
of a turn. Then, plug in the power cord, insert the key,
and run the treadmill for a few minutes. Repeat until
the walking belt is centered.
b. If the walking belt slips when walked on, first re-
move the key and UNPLUG THE POWER CORD.
Using the hex key, turn both rear roller bolts clock-
wise, 1/4 of a turn. When the walking belt is correctly
tightened, you should be able to lift each edge of the
walking belt 2 to 3 in. (5 to 7 cm) off the walking plat-
form. Be careful to keep the walking belt centered.
Then, plug in the power cord, insert the key, and care-
fully walk on the treadmill for a few minutes. Repeat
until the walking belt is properly tightened.
Top View
b
Rear Roller
a
b
20
1/8 in.
71
3
62
89
2–3 in.
Bolts

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