4740 W. ELECTRIC AVE. • MILWAUKEE, WISCONSIN 53219 • 414/672-7830 • FAX 414/672-5354 •
www.dingsbrakes.com
BK4773S-3 (6/2017)
4
Friction Disc Replacement
Caution: Load to be removed or blocked. Brake will be inoperative during this procedure.
If brake model number has a prefix VO, VU, or VA for vertical mounting, see page 8. When rotating friction disc (25) wears to
one-half of the original thickness, or 0.156”, replace disc:
1.
Removing electromagnet assembly
Disconnect power.
2. Remove cover locknuts/seals (70 & 71) and cover (67).
3. Remove electromagnet assembly (32 & 50A) by removing nuts and washers (61, 60, & 59) from the magnet assembly
(50A). Remove magnet assembly (50A). Remove all nuts, washers, and springs (44, 43, & 42) from pressure plate (32).
Remove pressure plate (32) by rotating counter-clockwise to remove torque spring bolts (28) from slots in brake bracket
(1).
4.
Replacing the friction disc
Remove worn rotating discs (25) and stationary discs (26). Replace worn discs and install new discs in the same order.
5.
Re-assembly of electromagnet assembly (15) Refer to Fig. 1 & 2.
Reinstall pressure plate (32) by rotating clockwise
to engage both torque spring bolts (28) into slots in brake bracket (1). Replace all nuts, washers, and springs (42, 43, &
44). Nut (44) on the pivot post (17) should be adjusted, so the distance from the bottom of the pressure plate (32) to
the top of the brake bracket (1) is 7/16”. Reinstall magnet assembly (50A) and install nuts and washers (59, 60, & 61).
Nut (61) should be torqued to 20 lb-ft.
6. Readjust magnet air gap “D” as described under “Wear Adjustment”.
7. Reset spring height according to brake model number in Fig.1 from the top of the spring (42) to the bottom of the
pressure plate (32).
8. Energize coil. Magnet should be quiet; if not, refer to “Pivot Stud Adjustment”.
9. Check manual release operation before completing installation. Adjust per “Manual Release Adjustment” if required.
10.
Completing installation
Replace cover (67) and cover locknuts/seals (70 & 71). Tighten nut (71) to 30 lb-in. Reconnect power.
Magnet Assembly Replacement
Caution: Load to be removed or blocked. Brake will be inoperative during this procedure.
1. Disconnect power supply.
2. Remove cover locknuts/seals (70 & 71) and cover (67).
3. Remove nuts and washers (59, 60, & 61) from magnet assembly (50A) & remove assembly.
4. Replace with new magnet assembly (50A) and install nuts and washers (59, 60, & 61). Nut (61) should be torqued to
20 lb-ft.
5. Place coil lead wires around mounting bracket (1) to the same side as the wire outlet position or internal wire outlet.
Connect coil lead wires per Fig. 1.
6. Set air gap “D” as described under “Wear Adjustment”.
7. Energize coil. Magnet should be quiet; if not, refer to “Pivot Stud Adjustment”.
8. Check manual release. If it does not operate properly, adjust as outlined under “Manual Release Adjustment”.
9. Replace cover (67) and cover locknuts/seals (70 & 71). Tighten nut (71) to 30 lb-in. Reconnect power.
Pressure Plate Replacement
CAUTION: Load to be removed or blocked. Brake will be inoperative during this procedure.
If you replace the magnet assembly, it may be necessary to replace the pressure plate (32). If it is badly deformed, it will be
difficult to make the magnet quiet.
1. To replace, remove electromagnet assembly (32 & 50A) from brake. See “Friction Disc Replacement Steps 1-3”.
2. Replace with new pressure plate (32) and reassemble per “Friction Disc Replacement Steps 5-10”.
Pivot Stud Adjustment
CAUTION: Load to be removed or blocked. Brake will be inoperative during this procedure.
This adjustment is made at the factory and may be required when replacing the magnet assembly (50A) or the pressure plate
(32). The purpose is to regulate the height of the pressure plate (32) so that when the magnet (50A) is energized, the pressure
plate (32) is parallel with it. This is required so that the magnet will be quiet.
NOTE: Cover (67) must be removed to make this adjustment.
1. To adjust: Rotate nut (44) with washer (43) on pivot post (17) until the height from the bottom of the pressure plate (32) to
the top of the brake bracket (1) is near 7/16”.
2. Energize the magnet and turn nut (44) counterclockwise slowly until the magnet becomes noisy. Turn nut (44) clockwise
until the magnet becomes quiet. Hold nut in this position and turn magnet on and off to make sure the magnet does not
become noisy.
3. Operate the manual release. If the release does not operate properly, see “Manual Release Adjustment”.
