General Information
Four-Matic
TM
4WD Over-Running Clutch Operation
A drive shaft connected to the front axle provides power
for the rear 4WD drive axle. The drive shaft tor the rear
axle incorporates an
OVER-RUNNING (ROLLER)
Unlocked
49 RPM
50 RPM
49 RPM
Locked
49 RPM
CLUTCH THAT TRANSMITS POWER ONLY IN THE FOR-
WARD DIRECTION
.
Rear axle
pinion shaft
Front and rear axle gear ratios and tire sizes were
carefully selected so that during normal operation, the
REAR AXLE PINION SHAFT TURNS SLIGHTLY FASTER
THAN THE REAR AXLE DRIVE SHAFT
.
Rear axle
Any time the front wheels begin to slip (such as when
drive shaft
climbing a steep hill), the forward movement of the
traction unit slows. This causes the rear axle pinion
speed to slow down. As soon as the rear axle pinion is
Figure 4a
turning the same speed as the drive shaft, the roller
c
lutch will engage and power will be transmitted from
the drive shaft to the rear wheels – four wheel drive.
Figure 4b
1. Over-running clutch
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 pinion
shaft are turning faster than the drive shaft and the roller
clutch is disengaged.
NOTE: The Four-Matic four wheel drive system may not
oper
ate properly if the tires are replaced by different size
tires, or if proper tire pressure is not maintained.
Figure 5
Groundsmaster
®
223-D Page 14 - 3
Rev. B
General Information
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