18
AP Dynamometer Service Manual
Common
Probable
Suggested
Symptoms
Causes
Repair
Nonlinear
Bent bar
Replace pressure bar
Worn gauge movement
Replace gauge movement
Won’t repeat
Bad bar bearings (worn, rusty, or dirty)
Replace bearings in pressure bar
Worn gauge movement
Replace gauge movement
High on low end,
Bad pressure arm
Replace gauge movement
low on high end
Max hand will not
Spring too tight or
Replace max hand assembly
rotate smoothly
rusty/corroded
Pointer jumps
Bearings or pointer
Clean bearings,
rubbing on dial face
1 drop LPS on bearing,
or replace gauge movement
The setup shown above will give you an approximate tension reading. This
can vary from actual tension due to variables in equipment and environment.