General Information - Toro Reelmaster 335-D Service Manual

General Information

TM
Four-Matic 4WD Over-Running Clutch Operation
There are two hydraulic drive motors on the Reelmaster
335-D, 4WD; one for the front axle and one for the rear
axle. The drive for the rear axle incorporates an
RUNNING (ROLLER) CLUTCH THAT TRANSMITS POWER
ONLY IN THE FORWARD DIRECTION
Front and rear axle gear ratios and tire sizes were
carefully selected so that during normal operation, the
REAR AXLE SHAFT TURNS SLIGHTLY FASTER THAN THE
.
REAR AXLE MOTOR
Any time the front wheels begin to slip (such as when
climbing a steep hill), the forward movement of the
traction unit slows. This causes the rear axle shaft
speed to slow down. As soon as the rear axle shaft is
turning the same speed as the rear motor, the roller
clutch will engage and power will be transmitted from
the rear motor to the rear wheels – four wheel drive
(Fig. 3A).
When the traction unit is turning, the rear wheels swing
out in a larger arc and must travel faster than the front
wheels. In this condition, the rear wheels and axle shaft
are turning faster than the rear motor and the roller
clutch is disengaged (Fig. 3B).
NOTE: The Four-Matic four wheel drive system may not
operate properly if the tires are replaced by different size
tires, or if proper tire pressure is not maintained.
®
Reelmaster 335-D
OVER-
(Fig. 3A).
Page 6 - 3
49 RPM
Unlocked
50 RPM
49 RPM
49 RPM
Rear
Motor
Shaft
Figure 3A
Figure 3B
Locked
Rear
Axle
Shaft
General Information