Nexen SPC 837400 - Manual (Page 7)

7 FORM NO. L-20095-U-1112
FRICTION FACING ADJUSTMENT
Adjustment
Screw
(Item 18)
Jam Nut
(Item 19)
Jam Nut
(Item 31)
Adjustment
Screw
(Item 18)
Jam Nut
(Item 19)
Block
(Item 21)
Spacer
(Item 32)
Figure 5
SPRING ACTUATED
Note
Friction facing adjustment on spring actuated unit is
accomplished by applying hold-off pressure of 5.2-6.9
bar [75-100 psi] to release the spring actuator.
1. Manually release spring actuators (See Figure 6).
2. Apply hold-off air pressure. This will remove any tension
on the Tap Bolt for easier release.
Note
Before performing step three, determine the actuator
type and select either step 3a or 3b. Step four returns
to general instructions used for both models.
o
bSolete
t
hree
-P
ort
a
ctuator
o
nly
3a. Using a 9/16 inch socket wrench, turn the tap
bolt counterclockwise until the brake is released
(approximately 40 turns). Hold-off air pressure can be
removed at this time and service performed. (Refer to
Figure 6a)
t
wo
P
ort
a
ctuator
o
nly
3b. 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).
Spring
Brake
Service Service
Plug
Tap
Bolt
Spring
Engaged
Port
Breather
Plug
Air connected
to Spring
Engaged
Port
Figure 6a
AIR ACTUATED
1. Loosen the Jam Nut (Item 19) (See Figure 5).
2. Turn the Adjustment Screw (Item 18) counterclockwise
until a 0.79 mm [1/32 inch] customer supplied spacer
can be inserted between each Friction Facing (Item 6)
and the disc. Each side may be adjusted individually
(See Figure 5).
3. With customer supplied spacers inserted, turn
each Adjustment Screw (Item 18) clockwise until a
resistance is felt (See Figure 5).
Note
There should be a gap of 0.79 mm [1/32 inch] between
each Friction Facing and the disc.
4. Remove the customer supplied spacers and tighten
the Jam Nut (Item 19) to 20.3-27 Nm [15-20 ft-lb]
torque (See Figure 5).
5. Loosen the Jam Nut (Item 31) (See Figure 5).
6. Adjust the Spacer (Item 32) until its spherical end
touches the Block (Item 21) (See Figure 5).
7. Tighten the Jam Nut (Item 31) to 20.3-27 Nm [15-20
ft-lb] torque (See Figure 5).
Figure 6b
Spring
Brake
Service Parking Brake
Plug
Tap
Bolt
Spring
Engaged
Port
Air connected
to Spring
Engaged
Port
Obsolete Three-Port Model
Two Port Model
21.1 mm
[0.83 in]
Tap Bolt is caged.
CAUTION
Working with spring loaded or tension
loaded fasteners and devices can cause
injury. Wear safety glasses and take the
appropriate safety precautions.