Determining Total Flow DemandCheck flow setting for each function independently. (See implement operator’s manual, Specifications section, to determine correct motor flow settings.) Examples of functions which may cause the pump to operate at high pressure: - Down pressure systems (drills, air seeders, disks)—Can usually be considered to be zero flow demand after completion of raise or lower cycle. See Implement Connection Example 1—Pressure Control Valve Applications (Grain Drills or Air Seeders with Constant Down-Pressure System) in Hydraulic Connections section.
- Auxiliary flow control valves (vacuum flow control)—Completely open implement flow control valve and adjust tractor flow rate to desired setting. See Implement Connection Example 4— Planter with Vacuum Motor and Return Line to SCV Using Motor Return Tip in Hydraulic Connections section.
- Cylinder functions, where line or orifice restrictions control flow—Adjust tractor flow control to point where function speed begins to decrease.
- Auxiliary control valves (implement stack valves, row guidance)—Adjust tractor flow control to lowest setting resulting in correct operation.
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.) 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 implement is so equipped.
NOTE: Flow measurements are made without steering or hitch being used. SCV FLOW (Approximate) |
|---|
Engine rpm | Pump Flow (45 cm3 Pump)
L/min (gpm) | Pump Flow (63 cm3 Pump)
L/min (gpm) | Pump Flow (85 cm3 Pump)
L/min (gpm) |
|---|
800 | 37 (9.8) | 52 (13.7) | 75 (19.8) | 1500 | 80 (21.1) | 109 (28.8) | 152 (40.2) | 1700 | 93 (24.6) | 125 (33.0) | 174 (46.0) | 1900 | 105 (27.7) | 142 (37.5) | 196 (51.8) | 2100 | 117 (30.9) | 158 (41.7) | 218 (57.6) | 2200 | 124 (32.8) | 166 (43.9) | 229 (60.5) |
SCV FLOW OUTPUT (Approximate) 1 |
|---|
SCV Flow Settings | Pump Flow (45 cm3 Pump)
L/min (gpm) | Pump Flow (63 cm3 Pump)
L/min (gpm) | Pump Flow (85 cm3 Pump)
L/min (gpm) |
|---|
0.1 2 | — | — | — | 1.0 | 1.9 (0.5)3 | 2.3 (0.6)3 | 3.4 (0.9)3 | 2.0 | 6.1 (1.6) | 6.1 (1.6) | 7.2 (1.9) | 3.0 | 13.6 (3.6) | 12.9 (3.4) | 14.0 (3.7) | 4.0 | 20.4 (5.4) | 20.1 (5.3) | 21.2 (5.6) | 5.0 | 28.0 (7.4) | 27.3 (7.2) | 28.0 (7.4) | 6.0 | 40.9 (10.8) | 40.1 (10.6) | 40.9 (10.8) | 7.0 | 62.1 (16.4) | 62.1 (16.4) | 62.5 (16.5) | 8.0 | 81.4 (21.5) | 80.6 (21.3) | 81.4 (21.5) | 9.0 | 107.1 (28.3) | 105.6 (27.9) | 106.7 (28.2) | 10.0 | 124.5 (32.9) | 138.5 (36.6) | 136.7 (36.1) |
1 At 2000 rpm and 454 kg (1000 lbs) of load at point of use.
2 0.1 = Minimum Flow Setting
3 Observed under no load.
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