Great Plains EHPR Valve Calibration - Manual (Page 5)

Great Plains Mfg., Inc.
Calibration Procedure 5
12/10/2008 401-565M
Confirm System Operation
Leave the fan/steering circuit active for these steps.
26. Disconnect the HHCT from the ECU.
!
CAUTION
Injury Risk:
Be directly ahead or behind, and outside a caster wheel for
step 27 through step 29. At one or more steps the caster wheels
are likely to pivot under hydraulic power to match the current
tractor steering direction. This movement is sudden and force-
ful, and could knock you down or crush you if you get between
the wheel and nearby planter components.
27. Spin the left caster wheel forward. The fan should
engage, and manual pivoting of the casters should
be possible.
28. Stop the wheel. This may stop the fan. It may or may
not be possible to manually pivot the caster.
29. Spin the left caster wheel backwards. The fan should
stop/not engage. The casters may pivot to match
tractor steering - this could be a small or a large
movement. It should not be possible to manually
pivot the casters, as it they are now under active
hydraulic control.
Closeout
30. Set the fan/steering hydraulic circuit control to Float.
31. At the steering console, set the REVERSE STEER
switch OFF (down).
32. Lower the seed cart to the ground.
33. Perform Parking checklist from Operator Manual.
Steering System Operation
See Operator Manual 401-312M.