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FORM NO. L-20090-J-0801
INTRODUCTION
Nexen Power Capsuls are wet, multiple disc, and pneumatically or hydraulically operated clutch-brakes that are totally enclosed in rugged
housings.
Torque is transmitted through an alternating series of Inner Discs and Friction Discs. The Friction Discs are connected to the Input Shaft
and Brake Housing. The Inner Discs are splined to the Output Shaft. When pressure is applied to the clutch cylinders the Actuator Rods
shift the Pressure Plate/Bearing Ring assembly along the output shaft’s spline and clamps the clutch disc pack between the Pressure
Plate and the Input Shaft. Torque is transmitted through the Input Shaft to the discs and the Output Shaft. When pressure is exhausted
from the clutch cylinders and applied to the brake cylinders the Actuator Rods shift the Pressure Plate/Bearing Ring assembly in the opposite
direction and clamps the brake disc pack between the Pressure Plate and the inside wall of the Brake Housing. Torque from the Output
Shaft is absorbed through the discs, pins, Brake Housing, and Cylinders. Internal springs retain the unit in a neutral position.
Internally generated heat is transferred through an oil bath to the housing and then dissipated by convection to the ambient air. Power
Capsul Models 408, 410, and 415 are equipped with an internal, water cooled heat exchanger for additional cooling. The heat exchanger
is a 3/8 inch [9.53 mm] copper tube, fabricated into a serpentine shape, with attached cooling fins that lie at the bottom of the oil bath.
INSTALLATION
Nexen’s Power Capsul is foot mounted and equipped with input
and output shafts. The Power Capsul must be horizontally
mounted on a base capable of sustaining the braking torque
generated by the unit and the shafts must be aligned with the other
drive components.
A hose/fitting assembly, connecting both cylinders on each end of
the unit, provides one pressure inlet for both the clutch and brake.
The clutch inlet is on the Brake Housing and the brake inlet is on
the Clutch Housing. Actuating pressures are 30 to 150 psi [2.1
to 10.3 BAR].
WARNING: Nexen Power Capsuls must operate with Dexron
II or Type F transmission fluid. Any other transmission fluid
with a lower hot coefficient of friction (such as Dexron III or
Type F2) will result in increased slip and potential unit failure.
Before operating the Power Capsul, remove one breather
and fill unit to the oil level plug with Dexron II or Type F
transmission fluid.
Outer Bearings (Item 19) are prelubricated, sealed, and require no lubrication. Inner Bearings (Item 17 and 18) are lubricated by the internal
oil. Periodically inspect the oil level by removing the Oil Level Plug (Item 13). If oil flow is present, the oil level is adequate. If the unit is
to be pneumatically actuated, install an air line lubricator on the line ahead of the other controls.
After 2000 hours of operation, drain the oil and refill the unit with
fresh oil. If the unit is used on high cyclic applications, the oil should
be changed after 1000 hours of operation.
Water lines may be connected to the heat exchanger tube ends on
the clutch side, where it protrudes from the housing. A threaded,
flareless type tube fitting is recommended. Clean, soft water
should be used in the heat exchanger to prevent corrosion in the
tube.
LUBRICATION
