Harrington Hoists and Cranes Series 3 End Truck - Manual (Page 47)

7.4 Brake Adjustment
With this gear motor, brake torque can be adjusted within the range of 0 to 50% against the motor rated
torque, with the adjusting bolt. Readjust the brake torque when the braking surface of the disk is
worn and the braking force decreases.

Always set the brake torque for the left and right end trucks at the same value.
a) To adjust brake torque refer to Figure 7-2, Table 7-2, and Table 7-3:
(1) Loosen the lock nut 604.
(2) Brake torque is set by changing the height H of the adjusting bolt 603. The setting range
is within 0 to 50% of the motor’s rated torque.
(3) Tighten the lock nut 604. Do not to allow adjusting bolt 603 to move while tightening the
lock nut.
Figure 7-2 Brake Torque Adjustment
605
606
604
603
Part No. Part name
603 Adjusting
bolt
604 Lock nut
605 Spring
holder
606 Brake
spring
Table 7-2 Brake torque table
0
10
20
30
40
50
60
7 9 11 13 15 17
H(mm)
T
(%
)
M
Brake Torque Table
(for reference)
T: Ratio of Brake torque
to motor rated torque
H: Height of adjusting
bolt.
M: Set torque
NOTE: Brake is factory
set with H=12mm, which
corresponds to a brake
torque equal to 25% of
rated motor torque.
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