GREAT PLAINS NTA3007HD, Руководство оператора

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Great Plains | 166-207M | 02/26/2019 Table of Contents Index 88
NTA907HD and NTA3007HD Table of Contents Index Adjustments
Bypass with
LS or PFC Closed Syste
ms
Refer to Figure 93
Turn the adjustment knob counter-clockwise to increase
flow.
Turn the adjustment knob clockwise to decrease flow.
Turning it fully clockwise stops all bypass flow.
Failure to use the bypass valve on load-sensing tractors
may cause major tractor damage.
7. Adjust down-pressure before adjusting bypass.
8. With tractor at half throttle, adjust tractor flow-control
valve so that openers raise and lower at a
reasonable speed. Keep tractor at one-half throttle
for the remaining step.
 The faster openers raise and lower, the greater
potential for oil heating, premature wear or tractor
damage. The higher the bypass pressure, the greater
the potential for oil heating and premature tractor
damage. At the same time, for proper opener
operation the bypass valve must be set at least 20 bar
(300 psi) above the opener down-pressure setting
when the tractor is at one-half throttle. Therefore, you
should set the bypass valve as low as possible while
staying at least 20 bar (300 psi) above the opener
down pressure setting.
9. Slowly open the bypass valve until the down-
pressure gauges just start to decline.
10. Turn the bypass knob one turn in the closing
direction.
11. Lock the knob at that setting.
While 140 bar (2100 psi) is a good starting point for
setting the bypass valve, if you consistently operate the
drill with low opener down pressure you can set the
bypass valve below 140 bar (2100 psi). If you
consistently operate the drill with very high opener down
pressure, you may need a bypass-valve setting above
140 bar (2100 psi).
Figure 93
Bypass Adjustment
29422
W
C
T
B
k
r
w
c
t
B