Service Bulletin

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Customer Bulletin
Commercial Products
Vehicles #09-18
4 Wheel Driveline Binds/Difficult Steering
Product: Workman HDX Series May 10, 2013
Affected Units: Models:
07370
07370TC
07371
07371TC
Serial Numbers:
290000101-312000144
290000101-312000109
290000101-312000140
290000101-312000150
Popping or grinding sounds coming from either the front or rear differential in 4WD Workman
vehicles have been reported in 4WD machines built between 2009 and 2013. Other related
observations include difficulty in steering, front or rear tires dragging, and general traction bind. The
issue only occurs when the vehicle is operated on dry pavement in specific maneuvers: switching
vehicle from backward to forward travel and in slow extreme turning situations. (i.e., trailer backing,
etc.) A contributing factor has been determined to be incorrect adjustment of the steering tie rods,
resulting in the vehicle turning sharper in one direction, and undesired engagement of 4WD.
In a few units, front CV joint failures have been reported. If steering bias exists, the CV joint can
be over extended past its design limit for bend radius in sharp turns.
Turning radius inspection must be performed to determine if adjustment is indicated. See the
attached diagram for inspection process, turning radius specifications and adjustment procedure. If
replacing the CV axle, inspect the vehicle turning radius performance in full right and left turns after
the CV installation, then perform a toe-in evaluation to verify correct adjustment.
The unit should be inspected for this issue if steering complaints, driveline bind or CV joint failure
occurs.
Please contact your Toro Commercial Products Distributor for more information on this issue and for
assistance in addressing the problem. Reference Commercial Service Bulletin Vehicles 09-18 when
making your inquiry.