|
1.
Check flow setting for each function, independently. (See implement operator's manual, applications section, to determine correct motor flow settings.)
Examples of functions which can cause the pump to operate at high pressure:
-
Down pressure systems (drills, air seeders, disks)-usually can be considered to be zero flow demand after completion of raise or lower cycle.
-
Auxiliary flow control valves (vacuum flow control)-Completely open implement flow control valve and adjust tractor flow rate to desired setting
-
Cylinder functions, where line or orifice restrictions control flow-Adjust tractor flow control to point where cycle time just begins to decrease.
-
Auxiliary control valves (implement stack valves, row guidance)-Adjust tractor flow control to lowest setting resulting in correct operation
2.
Determine total flow demand by adding flow requirements for each SCV using settings determined in Step 1. Include hitch and power-beyond flow requirements, if applicable. (Refer to chart for correct settings.)
3.
Determine if flow demand exceeds available pump flow (Refer to chart for available pump flow) :
-
Flow demand is less than available pump flow but there is performance concern. (See your John Deere Dealer.)
|
-
Flow demand exceeds pump flow:
-
Increase engine rpm, if possible
-
Decrease flow setting on non-critical functions
-
Convert implement open center valves to closed center operation, if possible
| |
|
|
| PUMP FLOW AVAILABLE (MST) |
| |
| |
Flow at 83°C (150 °F) |
| Engine rpm |
L/min |
gpm |
| |
|
|
| 1000 |
83 |
22 |
| 1500 |
125 |
33 |
| 2000 |
168 |
44 |
| |
|
|
| PUMP FLOW AVAILABLE (PST) |
| |
| |
Flow at 83°C (150 °F) |
| Engine rpm |
L/min |
gpm |
| |
|
|
| 1000 |
89 |
23 |
| 1500 |
136 |
36 |
| 2000 |
182 |
48 |
| |
| HITCH FLOW (Fast Rate) |
| |
| Hitch Cylinder |
Flow |
| Diameter (mm) |
L/min |
gpm |
|