Motor Brake Data | Yale 11353395D instruction

(2)Make sure power to the hoist is off and locked out.

(3)Remove the four (4) bolts attaching the fan shroud to the motor and remove the fan shroud. See Figure 5-9.

(4)Carefully roll the large O-ring from the groove over the air gap back toward the magnet body. Do not excessively stretch this O-ring.

(5)Measure the air gap using feeler gages. If the air gap exceeds the maximum value shown in Table 5-1, the air gap must be reset.

(6)To measure the thickness of the friction disk, it is necessary to remove the brake body from the motor end bell. Remove the three (3) brake mounting bolts and draw the brake body away from the friction disk. Carefully set the brake body down on the motor shaft directly in front of the fan. Draw the friction disk away from the end bell and measure the thickness over the friction surfaces. If the friction disk thickness is less than the minimum shown in Table 1, it must be replaced. See Section IX, Figure 9-10. If the friction disk thickness is within the allowable, reassemble the brake body to the motor end bell and torque the mounting bolts to the value shown in Table 5-1. Whenever the friction disk is replaced, it is necessary to reset the air gap.

Hoist	"B" Frame	"C" Frame
Mounting Bolt	18 ft-lbs.	18 ft-lbs.
Torque	18 ft-lbs.	18 ft-lbs.
Torque
Nominal Air Gap	0.016 in.	0.016 in.
Maximum Air Gap	0.031 in.	0.035 in.
Minimum Brake	0.453 in.	0.472 in.
Disk Thickness	0.453 in.	0.472 in.
Disk Thickness
Table 5-1.	Motor Brake Data.

(7)To reset the air gap, begin by releasing the (3) mounting bolts 1/2 turn. Turn the hollow spacer bolts into the magnet body approximately 1/4 turn. Retighten all three mounting screws. Measure the air gap at a minimum of three places around the circumference. Threading the hollow spacer bolts into the magnet body will decrease the air gap while backing these spacer bolts out of the magnet body will increase the air gap. Repeat this step as necessary until the required air gap is

achieved. The air gap must be the same all the way around the brake. Once the air gap is correct, torque the mounting bolts to the value shown in Table 5-1.

(8)Replace the large O-ring over the air gap and reassemble the fan shroud to the motor.

(9)Test hoist per Section V, Paragraph 5-13 to ensure proper brake operation.

c)Brake Disassembly.

(1)Lower hook block to the floor and relieve all load from ropes.

(2)Make sure power to the hoist is off and locked out.

(3)Remove the four (4) bolts attaching the fan shroud to the motor and remove the fan shroud. See Figure 5-9.

(4)Remove the snap ring behind the plastic fan. Carefully remove the fan from the motor shaft. Remove the snap ring in front of where the fan was mounted.

(5)Disconnect the two wires from the terminal block on the magnetic body.

(6)Remove the three mounting bolts that attach the brake body to the motor end bell and remove the brake body from the motor. Remove the friction disk from the motor shaft.

(7)Clean and inspect all components and working surfaces. Replace all damaged or worn components as necessary. Measure friction disk thickness and replace if less than the minimum thickness shown in Table 5-1.

d)Brake Re-assembly.

(1)Install the friction disk on the splined hub. The friction disk must slide on the splined hub and seat against the end bell of the motor.

(2)Install the brake body to the motor end bell using the three (3) mounting bolts. The air gap must be reset as described in Section V, Paragraph 5-10.b. Torque the mounting bolts to the values shown in Table 5-1. Install the large O-ring in the groove over the air gap. Ensure this O- ring is not pinched in the air gap.

Motor Brake Data.