Instruction manual

4-3 Emergency Controlled Descent Brake
XE301P
The controlled descent brake is found between
the motor and gearbox. It is sealed and therefore
should be clean and not worn. It only functions
during intentional use for emergency descent.
4-4 Dissassembly an Checks of Emergency
Controlled Descent Brake XE301P
1) Remove the motor from the gearbox by
unscrewing the 4 M5x153 threaded bolts
{Code #26097, Pos. 12}.
2) Remove the centrifugal brake assembly
{Code #39346, Pos. 28}. If it is stuck, you
can thread in 2 M6 screws and use them to
pull out the brake (See Figure 447).
3) Inspect the brake pocket. The ring should
show no wear. There should be no oil, dust,
or debris inside. Clean if necessary with
brake cleaner (See Figure 448).
4) Remove the O-ring seal {Code #41996, Pos.
27}. Inspect it for damage and replace if
flattened or damaged (Figure 449).
5) Examine the brake assembly. The shoes
should not be worn and the springs should be
correctly in place (See Figure 450). The
lining should be secure.
6) Check that the speed marked on the brake in
RPM corresponds to the motor nameplate
UPM. 1900 is normal.
4-5 Reassembly of Emergency Controlled
Descent Brake XE301P
1) Make sure the snap ring is on the shaft.
Insert the key {Code #40986, Pos. 11}.
Grease the shaft lightly for ease of brake
removal for future inspections (See Figure
448).
2) Insert the brake assembly with the threaded
holes upward (See Figure 451). Replace the
o-ring.
3) Refit the motor to the gearbox.
28
Figure 447
Figure 448
Figure 449
Figure 450
Figure 451