Great Plains EHPR Valve Calibration - Manual (Page 2)

Great Plains Mfg., Inc.
2 EHPR Valve Calibration
401-565M 12/10/2008
Before You Start
Review these instructions, with the following objectives at
each step:
• Need:
EHPR calibration is not a routine task. The normal
Steering Calibration done at post-delivery does not
require the HHCT or these instructions.
• Pre-requisites:
ECU must be loaded with valid working firmware. If any
update is needed, perform it prior to EHPR calibration.
• Safety:
Hydraulic Lines may be under pressure even with trac-
tor circuits in Float.
Frame-mounted coulters have sharp disk blades under
the work area.
• Comprehension:
Make sure the operator understands where involved
components are located, how to use the tools, the
steps involved, and what to expect.
Pre-Calibration Preparation
Work Location
1. If the planter must be moved prior to calibration, plan
the method and route so that only forward moves are
necessary. It is not safe to make reverse moves on
the planter’s caster wheels when either EHPR or
normal Steering Calibration need to be done.
Prepare Planter
2. If a seed hopper or box is mounted, close the slide
gate to prevent seed flow.
3. Fully hitch to suitable tractor or hydraulic source.
Operate the hydraulic source until the oil is warmed
to normal operating temperature.
4. Set tractor steering wheels straight ahead.
5. Hoist, lift or jack up the seed cart so that caster
wheels are off ground.
6. Adjust fan/steering system hydraulic circuit to normal
operating flow.
Calibrate Sensors
7. Perform the Steering Calibration (see Operator Man-
ual 401-312M) at this time. This calibrates the ECU
for the tractor and cart linear displacement sensors.
Sensor calibration must be done before EHPR valve
calibration.
Avoid High Pressure Fluids
Escaping fluid under pressure can penetrate the skin,
causing serious injury.
▲ Reduce the hazard by relieving pressure before disconnect-
ing hydraulic lines.
▲ Wear protective gloves and safety glasses or goggles when
working with hydraulic systems.
▲ Assume lines are pressurized until bled. Slowly open
(“crack”) fittings.
▲ Use a piece of paper or cardboard, NOT BODY PARTS, to
check for suspected leaks.
▲ If an accident occurs, seek immediate medical attention
from a physician familiar with this type of injury.
Note: The cart can be lifted off the ground using its own
lift-assist cylinders if the following conditions are
met:
The hitched tractor must have sufficient weight.
The shipping stand is installed on the planter.
The lower 1in pins must be installed in the floating
lug at each lift-assist cylinder rod end. The shear
bolts must be removed. The top link must be left
disconnected at the 3-point hitch.