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Global Brake Series
MI 850A169 1 L
Page 10 of 14
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 and remove the brake from the shaft. For the GBE/M
and GBF/M models use the supplied eye bolts to facilitate lifting and positioning of the brake.
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/GBEM and GBF/GBFM). Tap on the right stator side first. The rotor will remain attached to the left
stator. For the GBE/GBEM/GBF/GBFM insert the 4 bolts removed in step 3 into the tapped holes in the left
stator frame and screw them in evenly to separate the stator halves.
NOTE:
Removal of the junction box and cover are not required.
CAUTION
– Damage to the stator halves may occur.
Do not attempt to pry the left and right stators apart with a screwdriver or wedge. This can damage the
mating surfaces and could result in a loss of torque.
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.
10.
Remove the powder fill screw (and washer for GBA, GBAM, GBB & GBBM only) from the right stator. For
all other models remove the blind rivet.
NOTE:
Discard all bearings, powder seals, gaskets, snap rings and magnetic powder. These parts must
be replaced, and are included in the repair kit.
