Service manual
Arc Trainer
®
 425A Drive Link
Kit No. 425AK002
 Installation Instructions
NOTE: This instruction sheet describes how to
 replace the Drive Link in the Arc Trainer    
 425A. 
Tools Required 
 • Phillips screwdriver  • 3/4” Open end wrench
 • 5/32” Allen wrench  • 5/16” Allen wrench
 1.  Read and understand all instructions thoroughly 
  before installing this kit.
 2.  Verify kit contents. See Figure 1.
Figure 1 
A
A. Drive Link, (1), 425AK002
B. Loctite, (1), YA000201
B
 3.  Disconnect the external power source. 
  A.  Unplug the power cord from the power outlet.
! WARNING: Disconnect the power cord before
   continuing this procedure. Keep wet
   items away from inside parts of the
   unit. Electrical shock could occur
   even if the unit is unplugged.
 B.  Remove top cover. 
6.  Remove upper side cover.
  A.  Using a Phillips screwdriver, remove the 
      screw securing the upper side cover. 
   See Figure 4.
Figure 2
Screws 
(4)
Front 
Cover
Figure 3
Screw 
4.  Remove the front cover.
 A.  Using a Phillips
 screwdriver, remove 
 the four screws 
 securing the front 
      cover. See Figure 2.
  B.  Remove front cover.
5. Remove top cover.
  A. Using a Phillips screwdriver, remove the
     screw securing the top cover. See Figure 3. 
Figure 4
Locking
Connectors
Upper Left 
Side Cover
Screw 
  B.  Remove upper side cover. 










