Genie GTH-644 Operator's Manual page 46

OPERATION
BEFORE OPERATING THE FORKLIFT
Operate the frame sway control (A) momentarily right and left.
A
C
Check the steering operation by turning the steering wheel (B)
approximately 1/4 turn in each direction. If the front and rear
tires are not aligned properly, straighten the rear wheels with
the steering selector valve (C) in the "4 wheel" position. Move
the steering selector valve to the "2 wheel" position. Bring the
front tires into alignment with the rear tires. Place the steering B
selector valve back into the "4 wheel" position.
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