Hydraulics – Great Plains 1700TT Dual Valve User Manual

Page 5

Hydraulics

Great Plains Mfg., Inc.

Series I 2200TT & 3000TT Turbo Till 586-043M

1/30/2003

1700TT Hydraulic Update - Down Pressure Setup and Operation

Note: This setup procedure is for tractors with closed-center or pressure compensated flow
hydraulic systems. For open-center hydraulic systems contact your dealer for instructions.

1. Adjust the bypass valve by turning knob

(1), Figure 2, clockwise all the way in and
then backing out 1 full turn.

2. On tractor, adjust flow-control valve to low

side of flow rate. NOTE: The faster the
flow of oil through the system the greater
potential for oil heating, premature wear
or tractor damage.

3. Lock the fold hydraulic lever for

continuous downward oil flow.

4. Adjust pressure reducing valves knob (2

& 3) on implement so the pressure
gauges reads 1200 psi each.

5. While watching pressure gauges, slowly

open bypass valve, knob (1) until gauges
reads around 1100 psi. Pressure might rise
and then fall off as knob is opened. If
pressure exceeds 1400 psi during this step,
the tractor flow is too high, reduce tractor
flow. Lock bypass valve knob (1) at 1100 psi.

6. Finally adjust valve knob (2) and (3) to 450-

500 psi pressure setting. This is a beginning

pressure setting. Once you are in the field,
these setting may need to change up or
down. You should never need to run less
than 300 psi or exceed 1000 psi. If you need
to run that high of pressure, make sure the
flow rate is turned down. Excessive flow can
cause higher pressure readings.

7. In field operation, Lock the fold

hydraulic lever for continuous
downward oil flow. If a wing is running
too high, increase pressure setting to
the appropriate valve, knob (2 or 3), to
level the wing. If a wing is running to
deep, decrease the pressure setting
with knob (2 or 3) on the appropriate
wing valve. Make sure wing gauge
wheels are properly set.

8. Caution: Never leave tractor valve

centered when unfolded with machine
in motion. Machine damage may occur
when wings flex up or down.

Figure 2