Total Rear SCV Flow

1. Check flow setting for each function independently (see implement operator's manual Specifications section to determine correct motor flow settings).

   Following may cause pump to operate at high pressure:

   • Down pressure systems (drills, air seeders, disks) can 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) - 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.
   
   

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 has performance concern (see your John Deere™ dealer).
   • Flow demand exceeds pump flow:
     • Increase engine RPM if possible.
     • Decrease flow setting on noncritical functions.
     • Convert implement open center valves to closed center operation, if equipped.
   
   

NOTE: Flow measurements made without steering or hitch being used.

SCV FLOW (Approximate)
Engine rpm	Pump Flow (48 cm3 Pump) L/min (gpm)	Pump Flow (63 cm3 Pump) L/min (gpm)	Pump Flow (85 cm3 Pump) L/min (gpm)
800	42.4 (11.2)	52 (13.7)	75 (19.8)
1500	85.8 (22.6)	109 (28.8)	152 (40.2)
1700	98.3 (26)	125 (33.0)	174 (46.0)
1900	110.7 (29.2)	142 (37.5)	196 (51.8)
2100	123.1 (32.5)	158 (41.7)	218 (57.6)
2200	129.3 (34.1)	166 (43.9)	229 (60.5)

SCV FLOW OUTPUT (Approximate)1
SCV Flow Settings	L/min (gpm)
0.12	—
1.0	1.9 (0.5)3
2.0	6.1 (1.6)
3.0	13.6 (3.6)
4.0	20.4 (5.4)
5.0	28.0 (7.4)
6.0	40.9 (10.8)
7.0	62.1 (16.4)
8.0	81.4 (21.5)
9.0	107.1 (28.3)
10.0	132 (35)

Hitch Flow
Hitch Cylinder	Flow
Diameter (mm)	L/min	gpm
90/90	71	18.7
100/100	88	23.2
100/115	102	26.9