Nexen QFB-2200 963999 - Manual (Page 6)

FORM NO. L-20297-C-0603 6
TROUBLESHOOTING
Symptom Probable Cause Solution
Failure to engage
Unexhausted air due to control valve malfunction. Replace control valve.
Lack of lubrication on Hub spline or in air chamber.
Lubricate Hub spline and check air line
lubricator
Rigid piping or tubing. Use flexible tubing.
Hub not captured on shaft. Be sure Set Screws are installed in Hub.
Weak or broken Compression Springs. Replace Compression Springs.
Failure to disengage
Air not getting to brake due to control valve
malfunction.
Replace control valve.
Hub not captured on shaft. Be sure Set Screws are installed in Hub.
Friction lock due to lack of lubrication on Hub spline
or in air chamber.
Lubricate Hub spline and check air line
lubricator.
Loss of torque
Weak or broken Compression Springs. Replace Compression Springs.
Worn or contaminated Friction Facings. Replace Friction Facings.
Incorrect Friction Facing wear adjustment (QFB only). Perform Friction facing wear adjustment.
Figure 5
Cylinder
Compression
Spring
Pressure Plate
O-Ring
Seals
Shims
Friction Plates
Hub
Drive Disc
Housing
Piston
Friction Facing