Troubleshooting – Nexen MWCB 830812 User Manual
Page 10

10
FORM NO. L-20016-X-1209
TROUBLESHOOTING
PROBLEM
PROBABLE CAUSE
SOLUTION
Failure to engage.
Air not getting to clutch-brake due to a control
valve malfunction.
Check for control valve malfunction and replace
valve if necessary.
Air leaks.
Replace air lines.
Lack of lubrication on the hub spline or in the
air chamber.
Lubricate hub spline and/or air chamber.
Rigid piping instead of flexible air lines.
Replace rigid piping with flexible air lines.
Failure to disengage.
Unexhausted air due to a control valve mal-
function.
Check for control valve malfunction and replace
if necessary.
Friction lock due to a lack of lubrication on the
hub spline or in the air chamber.
Lubricate hub spline and/or air chamber.
Rigid piping instead of flexible air lines.
Replace air lines with flexible air line tubing.
Weak or broken compression springs.
Replace compression springs.
Loss of torque.
Air leaks.
Replace air lines.
Overheating (fading).
Check manufacturing specifications to be certain
clutch-brake is suitable for application.
Overlap or simultaneous engagement of clutch
and brake when switching. Overlap can be
verified by motor amperage readings when
cycling with the clutch-brake versus clutch
(brake disconnected). Higher draw with the
clutch-brake indicates overlap.
Inadequate controls.
Install controls meeting the specification of
clutch-brake.
Air line too long between valve and clutch-
brake.
Shorten air line between valve and clutch-brake.
Air pressure too high.
Reduce the air pressure.
Lack of quick exhaust valves.
Install quick exhaust valves.
FIGURE 4
TyPICAL CLUTCH-BRAKE
Sheave
Ball
Bearing
Hub
Compression
Spring
Friction
Disc
Friction
Facing
Ball
Bearing
Air
Chamber
O-Ring
Seals
Friction
Disc
Ball
Bearing
Piston Air
Chamber
Friction
Facing
Piston
Compression
Spring
Shoulder
Bolt
- HWCB 832501 HWCB 832913 HWCB 832401 HWCB 832600 HWCB 832400 HWCB 832500 HWCB 832700 HWCB 832800 HWCB 832900 HWCB 832941 HWCB 832902 LWCB 828901 HWCB 832907 FWCB 827111 FWCB 826700 FWCB 826800 FWCB 826900 FWCB 827000 FWCB 827100 LWCB 828300 LWCB 828400 LWCB 828500 LWCB 828600 LWCB 828700 LWCB 828800 LWCB 828900 LWCB 828942 LWCB 828904 MWCB 830603 MWCB 830801 MWCB 830601 FWCB 827101 LWCB 828301 LWCB 828907 MWCB 830602 MWCB 830301 MWCB 830811 MWCB 830600 MWCB 830700 MWCB 830300 MWCB 830400 MWCB 830500 MWCB 830800 MWCB 830841 MWCB 830803 MWCB 830802 FWCB 847801 MWCB 848001 LWCB 847901 LWCB 847907 MWCB 848002 HWCB 848102 HWCB 848100 FWCB 847800 LWCB 847900 MWCB 848000