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Introduction
Just like the I-series with HydroGear transmis-
sions, the steering on the I-series tractor with the
Infinitely Variable Transmission (IVT) works in two
phases. First it will steer like any other tractor by turn-
ing the front wheels. Second and more importantly, the
steering linkage will control the drive output of the rear
wheels through the use of the IVT transmission.
The steering gear box is attached to the front
wheels by drag links. When the steering wheel is
turned, the gear box will turn the wheels. When the
wheels reaches around a 55
ahead, the gear box will start to slow the transmission
on the inside of the turn and continue turning the front
wheels. When the inside wheel reaches an angle of
90
, the rear wheel on that side will stop driving. Turn-
o
ing the wheel past that point will make the inside rear
wheel go in reverse The inside front wheel can reach a
108
angle. With the inside front wheel at a 108
o
and the transmission on the inside of the turn going in
reverse, the tractor will be in a zero turn.
Because the steering gear box is linked to the
transmission, 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 front end that is out of
adjustment will affect the adjustment of the transmis-
sion.
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.
CHAPTER 6B: STEERING - IVT TRANSMISSION
angle from straight
o
angle
o
Cam Slot Angle Adjustment
The cam slot adjustment is a critical adjustment on
the I-series tractor. It should only be necessary when
replacing the steering gear box.
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:
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 it creeps, cam angle needs adjusted.
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:
1.
Remove the dash and fender by following the
steps described in Chapter 4: Body/Chassis.
2.
Lock Steering Gear Box in Neutral Position:
2a. Remove the 1/4"-20 plug screw from the
steering gear box centering port using a 3/8"
wrench. See Figure 6B.1.
Plug screw
Figure 6B.1
STEERING-IVT
81
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