Nexen MWCB 830812 - Manual (Page 7)

7
FORM NO. L-20016-X-1209
NOTE
Nexen pneumatically actuated devices require clean, pressure regulated air for maximum performance and
life. All seals in Nexen pneumatically operated devices are lubricated for life, and do not require additional
lubrication.
However, some customers prefer to use an air line lubricator, which injects oil into the pressurized air, forcing
an oil mist into the air chamber. This is acceptable, but care must be taken to ensure once an air mist lubrication
system is used, it is continually used over the life of the product as the oil mist may wash free the factory
installed lubrication.
Locate the lubricator above and within ten feet of the product, and use low viscosity oil such as SAE-10.
Synthetic lubricants are not recommended.
Nexen product's bearings are shielded and pre-lubricated, and require no further lubrication.
LUBRICATOR DRIP RATE SETTINGS
SHEAVE MOUNT CLUTCH-BRAKE
Refer to Figure 3.
1. Insert the first Key (Item 30) into the shaft.
2. Slide the Clutch-Brake onto shaft and key; then, insert the
second Key (Item 30).
3. Tighten Set Screws (Items 27 and 28) to the recommended
torque (See Table 4).
NOTE
If a bushing for smaller diameter shafts is required, use
a bushing on both ends of the Clutch-Brake.
4. Align air inlet ports to a six o’clock down position to allow
condensation to drain out of exhaust port.
5. Fasten one of the ears of the Clutch-Brake to a fixed member
of the machine.
NOTE
The Piston Air Chamber (Item 7) floats laterally approxi-
mately 1/16 inch [1.59 mm] during operation. Make sure
securing pin allows 1/16 inch to 1/8 inch [1.59 mm to 3.18
mm] movement of Piston Air Chamber.
FIGURE 3
Shaft
Key
(Item 30)
Set Screw
(Item 28
or 48) Set Screw
(Item 27)
Key
(Item 30)
Clutch-Brake
TABLE 4
RECOMMENDED TIGHTENING TORQUES
INSTALLATION
(continued)
DESCRIPTION FWCB LWCB MWCB HWCB
35 In. Lbs. 80 In. Lbs. 80 In. Lbs. 23 Ft. Lbs.
Set Screw (Item 27)
[3.9 N•m] [8.9 N•m] [8.9 N•m] [31.2 N•m]
20 In. Lbs. 20 In. Lbs. 80 In. Lbs. — —
Set Screw (Item 28)
[2.2 N•m] [2.2 N•m] [8.9 N•m] — —
1. Close and disconnect the air line from the unit.
2. Turn the Lubricator Adjustment Knob counterclockwise
three complete turns.
3. Open the air line.
LUBRICATION
CAUTION
These settings are for Nexen supplied
lubricators. If you are not using a Nexen
lubricator, calibration must follow the
manufacturer's suggested procedure.
4. Close the air line to the unit when a drop of oil forms
in the Lubricator Sight Gage.
5. Connect the air line to the unit.
6. Turn the Lubricator Adjustment Knob clockwise until
closed.
7. Turn the Lubricator Adjustment Knob counterclockwise
one-third turn.
8. Open the air line to the unit.