Cub Cadet SLTX1000 Series - Manual (Page 31)

Electronic Power Steering
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NOTE: The basic steering system, such as the tie rod ends, drag links axles, etc., is covered in Chapter 3A:
Steering.
In 2012, Cub Cadet introduced the Electronic Power Steering (EPS) system on the Cub select models of the LTX
series of tractors. The EPS provides an electric assist to the steering wheel.
The EPS is a system consisting of three sub-assemblies: the rubber torsion coupling, the EPS module and
the EPS motor & gearbox. They form an assembly that is inserted between the steering shaft and sector gear. The
EPS system is treated as one part.
Rubber Torsion Coupling
The steering shaft connects the steering wheel to the EPS system through the rubber torsion coupling. As the
steering wheel is turned, it applies force to the coupling. The force causes the torsion coupling to twist or torque. The
amount the coupling torques is determined by the amount of force applied to the steering wheel, the more force
applied to the steering wheel, the more the coupling twists.
NOTE: The rubber torsion coupling has hard stops built into it. If the force applied to the steering wheel causes
the coupling to hit its hard stops, the steering input will transfer through the module into the steering
gearbox. This allows manual steering if the EPS system fails.
EPS Module
The EPS module controls the power supplied to the EPS motor. It senses the amount of force that is being
applied to the steering wheel by monitoring the torsion coupling. The module will ramp up the power supplied to the
EPS motor as the force applied to the steering wheel increases. The EPS motor will reach full power within a couple
of degrees of deflection of the torsion coupling.
Figure 3B.1
Rubber torsion coupling
EPS Module
EPS motor & gearbox
! CAUTION ! CAUTION
DO NOT loosen or separate any of
the EPS components.
The module is calibrated to the tor-
sion coupler when the EPS assembly is built at
the factory. Once it has been calibrated, it can not
be re-calibrated. Any shift between the coupling
and the module will result in the EPS auto-steer-
ing, which is a very unsafe condition.
NOTE: Auto-steering is a condition were
the EPS will turn the wheels to one
direction, once the engine is
started. This happens because the
calibration is off and the EPS thinks
there is a steering input when there
isn’t.
The EPS comes with a 4 year warranty. If there is
a failure with the system, replace the entire sys-
tem as an assembly.
CHAPTER 3B: ELECTRONIC POWER STEERING