Nexen BD 933507 - Manual (Page 16)

16 FORM NO. L-20063-AD-0314
MAINTENANCE
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BSolete
t
hree
-P
ort
a
ctuator
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nly
Note
The tap bolt beneath the actuator breather cap can
be used to physically release the spring in the event
of actuator failure or machine service without hold off
air available. DO NOT USE THE TAP BOLT TO ADJUST
THE FRICTION FACING GAP. If the actuator (spring
engaged units only) is damaged and air pressure will
not release the brake, use a 9/16 inch socket wrench
to turn the tap bolt counterclockwise until the brake
is released (approximately 40 turns).
D
iSengagement
MANUAL RELEASE
1. If a manual release for safety reasons is needed, first
apply hold off air pressure to remove any tension on
the Tap bolt for easier release.
2. Using a 9/16 inch socket wrench, turn the tap
bolt counterclockwise until the brake is released
(approximately 40 turns) (See Figure 15a).
3. Hold off air pressure can be removed at this time and
service performed.
r
e
-
engagement
1. To re-engage the actuator, apply hold off air pressure.
2. Turn the tap bolt clockwise until seated (approximately
40 turns).
3. Torque the tap bolt to 13.6-20.34 Nm [10-15 ft-lb].
4. Remove hold off air pressure.
t
wo
-P
ort
a
ctuator
o
nly
Note
The Hex bolt on the back of the actuator canister
can be used to physically release the spring in the
event of actuator failure or machine service without
hold off air available. DO NOT USE THE TAP BOLT
TO ADJUST FRICTION FACING GAP. This will lower
torque capabilities. If the actuator (spring-engaged
units only) is damaged and air pressure will not release
the brake, use a 3/4 inch socket wrench to turn the tap
bolt counterclockwise until the brake is released. The
spring is fully compressed when the bolt is backed
out approximately 21.1 mm [0.83 inches].
D
iSengagement
1. If a manual release for safety reasons is needed, first
apply hold off air pressure to remove any tension on
the Tap bolt for easier release.
2. Using a 3/4 inch socket, turn the tap bolt
counterclockwise to fully cage (compress) the spring.
The spring is fully compressed when the bolt is backed
out of the unit 21 mm [0.83 inches]. (Refer to Figure
15b).
3. Hold off air pressure can be removed at this time and
service performed.
r
e
-
engagement
1. To reengage the actuator, apply hold off air
pressure.
2. Using a 3/4 inch socket, turn the tap bolt clockwise
to fully uncage (decompress) the spring. The spring
is fully decompressed when the hex bolt head is flush
against the actuator.
3. Remove hold off air pressure.
CAUTION
This product is spring loaded under
extreme pressure. Do not disassemble.
actuator. If actuator malfunctions, replace
actuator or contact Nexen.
CAUTION
This product is spring loaded under
extreme pressure. Do not disassemble.
actuator. If actuator malfunctions, replace
actuator or contact Nexen.
Note
The tap bolt beneath the actuator breather cap can
be used to physically release the spring.