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CHAPTER 6A: STEERING - HYDROGEAR TRANSMISSIONS
Introduction
The steering on the I-series tractor works in two
phases.
•
First it will steer like any other tractor by turning
the front wheels.
•
Second and more importantly, the steering link-
age will control the drive output of the rear
wheels through the use of two HydroGear trans-
missions.
The steering gear box is connected to the front
wheels by drag links. When the steering wheel is
turned, the gear box will turn the wheels. The gear box
will slow the drive speed of the inside rear wheel. At
approximately 50
the steering gear box will start to
o
slow down the outside drive wheel. When the inside
front wheel reaches an angle of 90
that side will stop driving. Turning the wheel past that
point will make the inside rear wheel go in reverse The
inside front wheel can reach a 108
transmission on the inside of the turn driving in reverse.
The tractor will then be in a zero turn.
Because the steering gear box is linked to the
transmissions, the transmission adjustments and the
wheel alignment must be addressed together. A trans-
mission that is out of adjustment can make the steering
look out of adjustment just as a steering linkage that is
out of adjustment will affect the transmissions.
IMPORTANT: Check the tire air pressure before
attempting to diagnose any problems with the
steering or tracking of an I-series tractor. If the
tire air pressures are not equal across the same
axles, it will greatly affect the performance of the
tractor.
the rear wheel on
o
,
angle and with the
o
Cam Slot Angle Adjustment
The cam slot adjustment is a critical adjustment on
the I-series tractor, but it should only be necessary in
two cases.
1.
The cam slot angle adjustment must be set if the
steering gear box is replaced.
2.
In the extremely rare case that the angle is sim-
ply out of adjustment. The indications are as fol-
lows:
NOTE: Test tractor in a safe area in case the
tractor moves during testing.
A The tractor is running.
B Parking brake released.
C Feet off of the brake and drive pedals.
D Turn the steering wheel fully in both direc-
tions.
E If the tractor creeps, cam angle needs
adjusted. If the tractor does not creep, cam
slot angle adjustment is not needed. Pro-
ceed to the neutral and alignment adjust-
ments.
The second would be a safety issue
! CAUTION
! CAUTION
and must be addressed before
returning the tractor to service
To adjust the cam slot angle:
NOTE: A special tool P/N 753-05437 is needed
to make this adjustment. Do not attempt to make
this tool, if needed it can be ordered from the
Cub Cadet parts department.
1.
Remove the dash and fender by following the
steps described in Chapter 4: Body/Chassis.
STEERING-HYDROGEAR
49
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