34
TROUBLESHOOTING
ALWAYS disconnect power supply before removing any guards or covers and
before servicing this bender. Failure to do so may result in serious injury or death.
WARNING
Problem
Cause
Diagnosis
Cure
1. Bender will not
operate
Power source
Check for voltage at power
source
If power is on,
go to (#3)
2. No power at
bender
Bad power cord
Ohm cord for
broken wire
Replace cord
3. Power to bender
but will not
operate
Circuit break /
power switch in
the off position
Check power on load side
of breaker to neutral with
volt meter
Turn circuit
breaker on. If on,
go to the next
step.
Fuse blown
Ohm circuit for short
Replace
Control Transformer
bad
Check voltage in and out,
if input but no output
Replace
Contactor bad
Check contacts and ohm
coil for open circuit
Replace
Bridge rectifier bad
Check with ohm meter
Replace
Switch bad
Check with ohm meter
Replace
Motor bad
Check brushes and ohm for
open or short armature
Replace
4. Motor runs but
will not bend
Chain from gear box
to jack shaft broken
Remove cover and visually
check for broken parts
Replace
Bad gear box
Motor running but
no output through gear
box
Replace
Chain from jack shaft
to shoe sprocket
broken
Remove cover and visually
check for broken parts
Replace
Key between motor
and gear box missing
Remove motor from gear
box
Replace key
5. Bender operates
in one direction
only
Bad FWD / REV
switch
Ohm switch for open
contact or shorted contacts
Replace
Bad pendant cord
Ohm for broken wire
Replace
Bad contactor
Check contact and ohm for
open circuit
Replace
6. Contactors chatter Low power to bender
Check with amp meter
Do not use
long drop cords