Nexen SPC 837400 User Manual

Page 11

FORM NO. L-20095-U-1112

MAINTENANCE

bSolete

hree

-P

ort

ctuator

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. This will lower

torque capabilities. 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).

MANUAL RELEASE

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 9/16 inch socket wrench, turn the tap

bolt counterclockwise until the brake is released

(approximately 40 turns).

3. Hold off air pressure can be removed at this time and

service performed.

engagement

1. To reengage 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.

-P

ort

ctuator

nly

NOTE: The Hex bolt on the top 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 HEX 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].

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

6b).

3. Hold off air pressure can be removed at this time and

service performed.

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.

Note: The tap bolt beneath the actuator breather cap

can be used to physically release the spring.