3
MAINTENANCE
Due to its small number of moving components and its basic design, maintenance of the brake is
generally necessary only after extended service. When a problem appears in the system, ensure that all
couplings, belts, etc., and the control device are functioning properly. Use the Troubleshooting guide
below to determine the cause of the problem. For general maintenance, the brakes can be rebuilt with a
repair kit. A repair kit includes a new powder charge and the appropriate bearings, seals and snap rings
generally needed to rebuild the unit.
NOTE:
When ordering parts not contained in the kit, provide the model number, serial number and parts
list item number and description from Figure 1.
TROUBLESHOOTING
PROBLEM
POSSIBLE CAUSE
ACTION
Load is not controlled by brake
Power supply voltage output low
Magnetic powder has deteriorated
Coil is open
Replace or repair control
Overhaul the brake
Replace coil
Load operates in an intermittent
manner with proper voltage
Coil is intermittently open
Replace coil
Brake is noisy and has vibration
Bearings are worn
Overhaul brake using repair kit
DISASSEMBLY
(Refer to Figure 1)
1.
Remove the set screws and collar from the rotor shaft.
2.
Remove the external snap rings from both sides of the rotor shaft.
3.
Remove the three (four) screws which hold the left and right stators together.
4.
Separate the stator frames by tapping on the end of the rotor with a soft mallet (all models except
GBE and GBEM). Tap on the right stator side first. The rotor will remain attached to the left stator.
For the GBE and GBEM insert 4 bolts (5/16-18 or M8x1.25) in the tapped holes in the left stator
frame and screw them in evenly to separate the stator halves. The bolts should be 5 inches
(127mm) or longer in length.
NOTE:
Removal of the junction box and cover are not required.
CAUTION:
Do not attempt to pry the left and right stators apart with a screwdriver or wedge.
5.
Remove the coil and the coil gaskets from the stators.
6.
Remove the rotor from the left stator by tapping on the rotor shaft with a soft mallet from the left
stator side.
7.
Remove the powder seals from the stators by prying around the inner lip with a screwdriver.
8.
Remove the internal snap rings from both stators.
9.
Press the bearing out of each stator.
