Repair
1800 YRM 1463
Repair AIR GAP
or releasing before the other due to internal damage or tampering. Replace the entire brake assembly. Refer to the Remove section in this manual.
CAUTION The brake is not adjustable. Check the air gap to determine if replacement is necessary. NOTE: The air gap is very thin and may not be checked visually. Dimensions are not to scale and are for location references only. 1. Check the three outer socket head screws for appropriate torque to secure the brake to the motor. 2. Check for the correct air gap by measuring the distance between the bottom of the stator and the top of the pressure plate with the brake engaged (disconnected) using feeler gauges. See Figure 5. See Table 1 for brake specifications. 3. The air gap should be checked for minimum and maximum clearance at the six locations shown in Figure 6. 4. If the air gap allows the maximum feeler gauge to enter any of the six locations, replace the entire brake assembly. Refer to the Remove section in this manual. 5. If the air gap is too tight for a minimum feeler gauge to enter any of the six locations, the air gap has been altered by internal damage or tampering. Replace the entire brake assembly. Refer to the Remove section in this manual. 1. 2. 3. 4.
NOTE: During brake operation, the brake should engage and disengage with a solid, single-click noise. 6. Listen to verify the brake engages and disengages in one smooth operation. A double-clicking noise indicates that one side of the brake disc is applying
STATOR AIR GAP PRESSURE PLATE FEELER GAUGE
Figure 5. Air Gap
Table 1. Specifications Truck Model FS/OS/SS030BF/ OS030EF
4
Air Gap Min
Max
0.20 mm (0.008 in.)
0.40 mm (0.016 in.)
Mounting Capscrews Torque 10.8 N•m (8 lbf ft)
Minimum Friction Disk Thickness 8.50 mm (0.33 in.)