Nabrico DF-1 N Series, Owner'S Manual

Page: 62 / 72

62
NABRICO DF-1 N ELECTRIC WINCH Owner’s Manual
OM-DF1-021-A
MOTOR BRAKES
INSTALLATION & MAINTENANCE
RETAIN FOR FUTURE USE U35000 - 8 of 19
www.nord.com/docs 06.13.16
NORD Gear Corporation
Toll Free in the United States: 888.314.6673
NORD Gear Limited
Toll Free in Canada: 800.668.4378
Setting the Brake Air Gap
NORD spring-loaded brakes are virtually maintenance free.
However, the air-gap of the brake rotor or brake disc must
be periodically checked and adjusted. If necessary, the worn
brake rotor must be replaced. Table 6 serves as guide to check
and set the brake air gap as needed.
IMPORTANT NOTE
When a complete brake motor is supplied by NORD, the
air gap is already set at the factory. If the brake is ordered
as a part, the air gap must be set in the field. All brake air
gap adjustments must be made with the brake assembled
to the motor and the power off (brake engaged).
The brake air gap is checked by placing a feeler gage be-
tween metal anchor plate and the brake coil housing as
shown in Figure 6. This procedure is identical even for the
larger BRE800 and BRE1200 twin rotor brakes.
Figure 7 – Setting the Brake Air Gap
MOTOR
END SHIELD
MOTOR
END SHIELD
FIXING
SCREW
SETTING BOLT
(HOLLOW SCREW)
COIL
HOUSING
METAL
ANCHOR PLATE
ARMATURE
PLATE
BRAKE
ROTOR
AIR GAP
AIR GAP
BRAKE
HUB
X
X
Procedure
1. Loosen the fixing screws that attach the brake to the
motor’s end-shield by approximately half a turn. The brake
assembly may be further loosened by turning the setting
bolts or hollow screws counter- clockwise into the brake
coil housing.
2. The desired nominal air-gap for each brake size is
displayed in Table 6. In the course of making adjustments,
the air gap measurement must be checked in several places
using a feeler gauge. The feeler gauge should be
positioned between the armature plate and the brake coil
housing as indicated in Figure 7.
3. Decreasing or Increasing the air gap can be accomplished
per the following instructions:
Decreasing the Air Gap – To decrease the air gap, turn the
setting bolts or hollow screws counter-clockwise while
securing the fixing screws; alternatively, turn the fixing
screws clockwise while securing the setting bolts or
hollow-screws.
Increasing the Air Gap – To increase the air gap, turn the
setting bolts or hollow screws clockwise while securing the
fixing screws; alternatively, turn the fixing screws counter-
clockwise, while securing the setting bolts or hollow screws.
4. Re-tighten the fixing screws to the proper torque as
indicated in Table 6.
5. Re-check the air gap in several places and repeat Steps 1-5
as needed until the air gap spacing is uniform and
consistent all the way around the brake.
Table 6: Brake Air Gap Settings
Brake
Size Fixing Screw
Tightening Torque
Nominal Air Gap
Setting

Maximum
Air Gap

[lb-ft] [Nm] [in] [mm] [in] [mm]
BRE 5 2.2 3 0.008 0.2 0.024 0.6
BRE10 4.4 6 0.008 0.2 0.028 0.7
BRE20 7.4 10 0.012 0.3 0.031 0.8
BRE40 7.4 10 0.012 0.3 0.035 0.9
BRE60 18 25 0.012 0.3 0.039 1.0
BRE100 
18 25 0.016 0.4 0.043 1.1
BRE150 
18 25 0.016 0.4 0.043 1.1
BRE250 37 50 0.020 0.5 0.047 1.2
BRE400 37 50 0.020 0.5 0.047 1.2
BRE800 37 50 0.028 0.7 0.047 1.2
BRE1200 37 50 0.028 0.7 0.047 1.2

Tolerance: + 0.004 in [+ 0.1 mm]

Brake air gap must be re-adjusted before the stated value.
 When using the stainless steel friction plate (RG) increase the
nominal air gap to 0.6 mm (0.024 in.).