Using Rear SCV to Operate Hydraulic Motor

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Three-Function Deluxe Valve Shown

A - SCV I

B - Adjustable Flow Control Valve


Three-Function Deluxe Valve Section I Only

IMPORTANT: Use SCV I (A), with adjustable (internal) flow control valve (B) for hydraulic motor operations. Only motors requiring high flow at low pressure can be used on open center hydraulic systems. Do not use with motors requiring low flow at high pressure, oil will overheat and cause damage to hydraulic system. See your nearest John Deere dealer for more information on hydraulic motor applications.

IMPORTANT: Never regulate SCV I oil flow with an external flow control valve. Having two flow control valves in the same hydraulic circuit can overheat oil causing component malfunctions and damage.


Deluxe Valve Sections II or III

Use external flow control valve to regulate oil flow when operating a hydraulic motor three-function deluxe valve sections II or III, without internal flow control.


Hydraulic Motor Hose Connections and Control Lever Operations

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Cab Shown

A - SCV I Control Lever

  1. Shut off engine.

  2. Move SCV control lever full forward, into “float” detent. With three-function deluxe valve, use SCV I control lever (A).

  3. IMPORTANT: Motor must receive oil from retract port of SCV so when stopping motor, lever doesn't have to move through neutral to get to float position. Neutral standby pressure may cause back-pressure damage to hydraulic motor or hoses.

    Connect hydraulic motor hoses to SCV couplers (pressure to retract, return to extend) that correspond to selected control lever. With three-function deluxe valve, use SCV I couplers. Return oil may also be routed to a hydraulic motor return port (If Equipped) (See Using Hydraulic Motor Return Connection).

  4. Some hydraulic motors have a separate case drain line for internal leakage. The case drain line must be routed to the drain port to direct oil to sump (zero back pressure) (See Using Hydraulic Motor Case Drain Connection—If Equipped).

  5. Three-Function Deluxe Valve: Set control lever detent for continuous “motor” operation. See SETTING DETENTS AND OPERATING SCV CONTROL LEVERS—THREE-FUNCTION DELUXE VALVE (IF EQUIPPED).

  6. Start engine.

  7. Activate SCV by moving lever forward to retract detent position and adjust hydraulic flow rate per pump manufacturers guidelines.

  8. Shut off spray pump by moving SCV control lever to float position (full forward). Stopping spray pump by moving SCV to neutral position will cause high pressure oil to be trapped between SCV and motor. This may cause damage to motor seals. This also applies to other pumps and motors using the SCV pressure and return couplers.

  9. IMPORTANT: Do not use “neutral” lever position to stop hydraulic motor; use “float”. Neutral standby pressure may cause back-pressure damage to hydraulic motor or hoses.

    To stop hydraulic motor, move control lever full forward into “float” detent.

  10. Shut off engine and disconnect hoses from couplers.

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