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BXTR6438
5.14 Fluid Coupling
The BXTR6438 series machines are designed with
fluid coupling that converts the rotational power of the
engine to the rotor in an efficient controlled manner.
The fluid coupling does not have a direct mechani-
cal connection to the sheave, but instead drives the
sheave thru fluid contained inside the coupling.
It is an alternative to a mechanical clutch where
controlled start-up without shock loading of the power
transmission system is an advantage and results in a
superior, robust, low maintenance drive system.
5.14.1 Safety Release:
Although the fluid coupling is robust in its operation,
when the rotor is under excessive load or stalled, or if
there is excessive slipping, it causes a buildup of heat
in the fluid. To protect the system against damage,
there is a safety device built into the fluid coupling,
called the Fusible Plug.
If the coupling experiences sustained overload, and
begins to overheat, the fusible plug is designed to
release the overheated fluid in the coupling, avoiding
damage to seals etc.
If the fusible plug releases, there will be a sudden loss
of power to the rotor, and a noticeable puddle of fluid
will appear under the machine
The temperature at which the fusible plug activates is
180 °C (356 °F).
5.14.2 Reset the Safety:
The fusible plug is a replaceable component and the
BXTR6438 comes with an extra plug in case of a
release.
To bring the fluid coupling back into service the fluid
must be restored and the fusible plug replaced.
When replacing the fluid on the coupler, we
recommend using the
•
"45" fill mark when replacing the fluid on the
RotoFluid
coupler, and
•
Use the fluid specified in the manual ISO AW22
classification.
Fluid Coupling
Fusable Plug
180° C (356 °F)
Note
: Always read the coupling operator's
manual supplied with the machine to
familiarize yourself with its operating and
maintenance procedure details.
CAUTION
: Hot Oil and
Container: If there is a
fluid release from the hy-
draulic coupler, the oil and
container could reach tem
-
peratures of 180 °C (356 °F).
To prevent severe burns,
wait for the oil and container
to cool before attempting any
maintenance.
