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Nautilus® Sport Series Treadmill Service Manual
elecTrical and mechanical TroubleShooTing guide
Condition / Problem
Things to Check
Solution
1.
Knocking noise under the
motor cover or at the rear
of the treadmill.
Front and rear roller
Let the rollers run for a week. Sometimes
bearings will seat and quiet down.
Roller continues to knock, replace the
roller.
Running belt tension
If running belt is overtightened, it will put
excessive load on roller bearings. Loosen
roller adjustment bolts and check for
slippage.
Flywheel / Pulley on
applicable motors
Tighten set screw (5/32) on flywheel /
pulley.
white 6 inch fan on applicable
motors
Make sure that the 6 inch fan is not hitting
anything.
2.
Chirping or squeaking
noise under motor cover.
Drive Belt Alignment
Adjust the motor pulley and align with
roller pulley.
Drive Belt Grooves
Remove drive belt and check grooves in
belt for foreign matter or debris. Clean
and/or replace belt. Clean drive motor
pulley and roller pulley grooves.
Motor Brushes on T516 or
T518 units only
Remove and inspect the motor brushes.
Sand brush surface and clean commutator
surface and reinstall.
3. Walking belt slips.
Walking Belt Tension
Tighten walking belt tension.
NoTE: Do Not over tighten walking belt.
Drive Belt Tension
Loosen the 4 motor bolts and then
tighten the drive belt adjustment bolt,
(approximately 2-3 turns) then re-tighten
the 4 motor bolts.
Belt/Deck Lubrication
Spray with NAPA 8300®, Pyroil Silicone®
Lubricant or Lube-N-Walk®
Deck Surface
Check the deck surface and make sure
the surface is in good condition and not
worn.
4.
Walking belt hesitates
or seems to stick when
stepped on.
Walking Belt Tension
Is the walking belt overtightened? Loosen
the walking belt adjustment bolts at the
rear roller. Check for slippage.
5.
Speed loss when treadmill
is walked on.
Belt/Deck Lubrication
Lubricate belt/deck with Napa 8300®
or Pyroil Silicone® lubricant or Lube-N-
Walk®.
6.
Motor is making high
pitched noise (T516 or T518
models)
Motor Brushes
Remove and inspect motor brushes. Sand
brush surface and clean the commutator
and reinstall the brushes.