Great Plains CTA4000 Operator Manual - Manual (Page 23)

Preparation and Setup 19
08/03/2010 160-269M-A
Load Sensing Setup
To operate the CTA4000, some tractors with load-sens-
ing or constant-flow hydraulics need a bypass valve. See
“Hydraulic Bypass Kit” on page 53 for ordering infor-
mation. Contact your Great Plains dealer to order the
valve.
Failure to install the bypass valve may cause major tractor
damage. Contact your tractor dealer to verify if the bypass
valve is needed.
Refer to Figure 17
1.
After installing the bypass valve , adjust as follows:
2. Loosen lock-ring and completely close off bypass
cross-flow by turning knob fully clockwise.
Refer to Figure 18
3.
Set valve levers for Field operation.
4. On tractor, adjust circuit flow-control valve so open-
ers raise and lower at a reasonable speed.
Note: The faster openers raise and lower, the greater po-
tential for oil heating, premature wear or tractor
damage.
5. Engage tractor hydraulics for fan and opener-lift-and-
fold circuits. Lock hydraulic levers for continuous oil
flow. Make sure cart fan is operating at normal speed
(about 3600 rpm).
Refer to Figure 19 and Figure 17
6.
Adjust wing and center down-pressure-control valves
, on implement so gauges , read 1200 psi.
Do not adjust weight-transfer valve at this time. To avoid
implement damage, never set weight-transfer valve above 800
psi
.
7. While watching opener gauges, slowly adjust bypass
valve knob
just until needles on gauges ,
move down from 1200 psi. Lock bypass valve ring
at this setting.
8. Adjust pressure-control valves , to desired
opener down pressure. See “Sub-Frame Down-
Force” on page 37.
Figure 17
Optional Bypass Valve
17987
3
2
1
1
2
3
Figure 18
Levers for Bypass Setup
26372
Figure 19
Pre-Adjusting for Bypass
26380
8
5
6 7
4
9
4 5 6 7
8
9
3 6 7
2
4 5