EHHNK5 RIDE-ON TROWEL • OPERATION MANUAL — REV. #3 (05/03/21) — PAGE 21
Continuously Variable Transmission (CVT)
A continuously variable transmission (CVT) has been
installed to obtain maximum drive torque. This is
accomplished by continually adjusting the drive ratio
to obtain optimum torque and speed during all phases
of finishing, from low-speed/high-torque to high-speed
burnishing.
How It Works
The Multi-Clutch functions much like a standard CVT
system. As engine RPMs increase, the drive or primary
clutch closes, forcing the belt to ride outwards on the drive
sheaves and open the driven or secondary sheaves. The
opening and closing of these sheaves creates a continuous
drive ratio variation.
Most traditional CVT systems have a loose or slack belt
as the engine idles, and the sheaves of those systems are
constantly rotating. The rotation of the sheaves relative
to the belt causes unnecessary wear on the belt. The
stationary belt is also pinched by the constantly rotating
sheaves during startup. Therefore, wear on the belt occurs
any time the engine idles, as well as at every startup of
the driven equipment. This is where the Multi-Clutch differs
from other CVTs.
The Multi-Clutch provides belt protection through the use of
a series of centrifugal clutches. The starter clutch system
consists of two centrifugal clutches that drive the sheaves
of the drive (primary) clutch. The belt remains tight in the
sheaves, and both sheaves and the belt remain stationary
as the engine idles, reducing belt wear.
The starter clutch system also provides overload protection.
When too much torque is applied to the belt, the centrifugal
clutches will slip before the maximum load on the belt is
reached. This prevents belt slippage on the sheaves during
an overload, further protecting the belt from damage.
GENERAL INFORMATION
Training
For training, please use the
Training Checklist
located in
the front of this manual. This checklist is not intended as
a substitute for proper training, but will provide an outline
for an experienced operator to provide training to a new
operator.
