Great Plains 4000TT Operator Manual - Manual (Page 47)

Great Plains Mfg., Inc. Table of Contents ►
Section 2: Hydraulics
1/25/2008 Series I 1000TT - 4000TT Turbo-Till 586-043M
45
40’ Hydraulic Down Pressure Preparation and Setup
Note: This setup procedure is for tractors with closed-center or pressure compensated flow
hydraulic systems. Open center hydraulics not supported.
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. Never
exceed 1400 psi.
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) to 650-900 psi
pressure setting, never exceeding 1100 psi.
Adjust valve knob (3) to 650-750 psi.
pressure setting, never exceeding 1000 psi.
7. In field operation, Lock the fold
hydraulic lever for continuous
downward oil flow. If wings are
running too high, increase pressure
setting to the appropriate valve, knob
(2 or 3), to level machine. If center is
too high, decrease pressure setting
with knob (2) on Inside wing valve.
8. Caution: Never leave tractor valve
centered when unfolded with machine
in motion. Machine damage may occur
when wings flex up or down (see page
69).
Figure 2
!