Johnson AFG Pro 7.2AT, Service Manual

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CHAPTER 3: Troubleshooting
3.3.5 TROUBLESHOOTING - NOISE ISSUES
SOLUTION:
1.
Thumping noise twice per rotation on new machine
.
Sol
.
This noise is from the roller or running belt.
- If this is a new unit, some noise is normal as the running belt forms around the rollers.
- Check that the belt is centered and tensioned correctly.
- Remove and clean the rollers if needed.
- Replace the rollers or running belt as needed.
2.
High pitched “bell-like” sound from under the motor cover.
Sol. This sound is likely a moving component.
- Remove the motor cover and check the drive belt for alignment and make sure it is not slipping or is
frayed / cut in any way. Replace the drive belt if needed.
- Make sure the optic disk on the motor is not rubbing the speed sensor.
- Turn the motor by hand to see if motor brushes or bearings are rubbing. Replace the motor
if needed.
- Check the front and rear rollers, replace if needed.
3.
Rubbing / grinding noise.
Sol.. This sound is likely caused by the optic disk.
- Check that the optic disk is tight on the motor and not rubbing the speed sensor.
4.
Banging or clunking sound/5. Slapping / th
u
nking / squeaking sound with
e
ach footstep.
Sol. The sound is likely due to the unit not being level.
- Check that all levelers are touching the ground.
- Move the treadmill to another flat surface.
- This sound is from the running deck / belt.
- Check that the running deck is tightly attached to the frame.
- Check the deck shocks for denigration or crumbling. Replace if needed.
- Check to see if the air shock is making this noise, lubricate or replace if needed.
5.
Rubbing sound underneath the treadmill.
Sol. This sound is likely due to the air shock.
- Lubricate or replace the air shock as needed.
6.
Squeaking / grinding noise when using elevation.
Sol. This sound is likely from the incline motor.
- Check that the incline motor connection points include Teflon washers.
- Lubricate the incline motor worm screw and connection points with grease.
- Replace the incline motor.
C