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Figure 1

Running Belt Maintenance

Belt and Deck —

 Wipe the belt surface and the deck area with a clean dry towel to minimize 

the effect of friction between the deck and the running belt. This should be done often to 
prevent premature wear of the deck, running belt, and the drive motor system. See the 

Service Schedule

 at the end of this chapter.

The running belt may become loose and slip on the drive roller with each foot plant. If it does, 
follow the 

Tensioning and Centering the Belt

 procedure below. See the 

Service Schedule

 in 

this chapter for a minimum schedule for checking the belt tension.

Tension and Center the Belt —

 If the belt is slipping under each step perform this 

procedure:

Tools Required

• 3/4” Socket wrench

1.  Tension the belt.

A.

  Use a 3/4” socket wrench to turn each bolt 1/2 turn clockwise. See Figure 1. 

NOTE: 

Be sure to adjust each bolt equally on each side.

B.

 Press the 

Quick

 

Start

 key. 

C.

 Press the 

Speed

+

 to bring the speed up to 3.5-4 mph (5.6-6.4 kph). Allow the 

treadmill to run for a minute. 

D.

  Observe the belt to be sure it stays centered. If it is not centered follow step 2.

E.

  Walk on the belt to see if it still slips. If it does restart this procedure at step 1 A. If you 

have to do this procedure three times and it still slips call Cybex Customer Service. 
Follow the next step to be sure the belt is centered.

NOTE: 

Be careful not to over tighten the belt. Over tightening the belt can cause the belt to 
stretch and require replacement.

Preventive 

Maintenance

Page 4-3

Cybex 425T Treadmill Owner’s Manual

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