Specifications, Service and Repair of Farm and Lawn Tractors

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4044, 4052, 4066 John Deere Hydraulics and PTO

JD 4044M, 4044R, 4052M, 4052R, 4066M, 4066R tractors PTO

Rear PTO

Testing

- Sit on operator’s seat.
- Lock park brake.
- Move transmission to neutral position. PRT - Depress clutch pedal completely and move the transmission range and gear shift levers to the N position. HST - Move the range shift lever to the neutral position.
- Pull Power Take-Off engagement switch to the on position.
- Turn key switch to the start position. Engine must not crank.
- Push PTO engagement switch to the off position.
- Turn key switch to the off position.

Rear Power Take-Off Switch - Use rear mounted equipment rated for 540 rpm. Do not operate rear PTO over 540 rpm mark on tachometer.

Using Rear PTO Switch (Operator on Seat)

- Sit on operator,s seat.
- Stop machine motion and: PowrReverser Transmission - Move the reverser lever to neutral position, push in clutch and place transmission gearshift lever in neutral. Hydrostatic Transmission - Remove foot from forward and reverse travel pedals.
- Lock the park brake.
- Move the 4044, 4052, 4066 John Deere transmission range shift lever to the neutral position.
- The tractor will not start if the rear PTO knob is pulled to the on position. If the operator leaves the seat with the engine running and the PTO engaged, the safety interlock system stops the engine and all implements. Start the engine.
- Set engine speed to 1500 rpm or less.
- Pull the Power Take-Off switch up to the on position.
- The instrument panel PTO engaged light illuminates when the PTO is engaged. Adjust the hand throttle forward to the desired speed for the implement used.

Using Rear PTO Switch (Operator off Seat)

- Move transmission to neutral position. PowrReverser Transmission - Depress clutch pedal completely and move the transmission gear and range shift levers to the N (neutral) position. Move the reverser lever to the N (neutral) position. Hydrostatic Transmission - Move the transmission range shift lever to the N (neutral) position.
- Lock the park brake.
- Push the Power Take-Off switch down to the off position. The tractor will not start if the rear PTO knob is pulled to the on position.
- Start the engine and adjust speed to 1500 rpm.
- Get off the operator seat.
- Pull the PTO switch to the on position. The instrument panel PTO engaged light illuminates when the rear PTO is engaged.
- Adjust the hand throttle forward to the desired speed for the implement used. The PTO marker on the tachometer indicates engine speed for a standard 540 PTO.

Disengaging the PTO Switch

- Adjust engine rpm to low idle.
- Push PTO switch down to the off position.

4044M, 4044R, 4052M, 4052R, 4066M, 4066R John Deere Hydraulic System

Dual Selective Control Valve Lever

Dual selective control valve (SCV) lever controls any hydraulically driven device connected to mid selective control valve (SCV), most commonly a loader.

When digging and moving heavy materials, first rollback, then raise. This provides full pressure to each circuit and will be more productive. 4M and 4R series JD tractors use a regenerative dump function to increase dump speed, and eliminate cavitation or loose motion of the bucket at low engine speeds. This position will always extend a cylinder, regardless of how the two hoses are connected. Do not use this function for single acting cylinders, or any hydraulic motor.

The 4M and 4R series JD tractor use a series boom valve to give faster cycle times at moderate engine speeds. This also enhances return to dig speed, and bucket leveling during the raise cycle.

A single function operates when selective control valve lever is moved straight away from center, in one of four primary directions (front, back, left, or right).

- Front - Boom Lower
- Full-front (I) is a detented position used for “float” operations.
- Back - Boom Raise
- Left - Bucket Rollback (Curl)
- Right - Bucket Tilt (Dump)

Two functions operate simultaneously when lever is moved at 45 angles from primary directions, into a two-function zone. Two-function zones are: Boom Lower/Bucket Dump, Bucket Dump/Boom Raise, Bucket Curl/Boom Lower. Two-function raise/curl is limited in performance for very heavy loads. If load causes this two-function operation to stall, single function rollback to raise is required.

When lever is released to spring-centered neutral position, mid-mount valve holds boom and bucket in position. Cylinder operating speed depends on how far from center the control lever is moved. When lever is first moved from center, hydraulic functions operate at slow speed, then move progressively faster as lever is moved farther away from center, out to fast speed operating position.

Third function operations, can be performed simultaneously with any single and two-function operations. “Float”: Push lever full forward into detent when “Float” is desired. Detented “Float” position allows loader boom to move up and down freely while traveling over rough ground. Manually return lever to neutral when “float” is no longer needed.

SCV - Open Operator Station

To prevent loader movement, engage selective control valve (SCV) lever lock before dismounting JD tractor. Selective control valve lever must be in center (neutral) position for lock to engage. Selective control valve (SCV) lever lock does not lock out switch-operated third-function hydraulics, which are active anytime the key is ON. Selective control valve (SCV) lever lock (A) allows the operator to control the type of dual SCV lever movement needed for a particular operation or situation. Operation of the SCV lever lock is indicated on SCV lever lock label.

- To prohibit movement of SCV lever in all directions, move SCV lever lock in to the 0 position. Operation of the SCV is totally locked.
- To prohibit engagement of the REGEN (regeneration) function of the SCV, pull lever lock to the middle or 1 position. This will lock out the loader bucket function. REGEN can cannot be used for hydraulic motors, and it will always cause a cylinder to extend regardless of connections. REGEN is intended to increase bucket dump speed and eliminate cavitation in bucket cylinders.
- To allow movement of SCV lever in all directions, move SCV lever lock to the 2 position. Operation of the SCV is totally unlocked.

SCV Lever Lock - Cab

JD 4044, 4052, 4066 SCV lever lock (A) allows the operator to control the type of dual SCV lever movement needed for a particular operation or situation.



A - SCV Lever Lock, B - SCV Lever, C - In Position, D - Center Position, E - Out Position

- To prohibit movement of dual SCV lever in all directions, make sure SCV lever (B) is in center position, and press the SCV lever lock (A) to the in position (C). Operation of the dual SCV is totally locked.
- To allow movement of dual SCV lever in all directions, move SCV lever lock to the center position (D). Operation of the dual SCV is totally unlocked. To prohibit engagement of the REGEN (regeneration) function of the SCV, pull lever lock to the full out position (E). This will lock out the loader bucket function. REGEN cannot be used for hydraulic motors, and it will always cause a cylinder to extend regardless of connections. REGEN is intended to increase bucket dump speed and eliminate cavitation in bucket cylinders. After extended use, the dual SCV lever may require cable adjustment to lock out.

3rd SCV Continuous Flow Switch

- Continuous Flow Switch: This switch will supply continuous flow to a hydraulic device.
- Off: Place switch in this position to deactivate continuous flow from the 3rd SCV outlet or depress the bottom of control switch.
- On: This position will activate continuous flow from the 3rd SCV outlet after the key switch has been turned on. Turning the key switch off will deactivate the continuous flow circuit. When the key switch is turned on, the 3rd SCV continuous flow circuit will not activate until after the operator presses and releases the switch in the momentary enable position. The green light in the switch will illuminate if continuous flow is activated.
- Enable: This is a momentary position that will reactivate the 3rd SCV continuous flow circuit. When the switch is depressed and released, it will return to the center on position.

3rd SCV Outlet Control

The 3rd (SCV) outlet may be operated in a momentary condition to operate attachments such as extending or retracting a hydraulic cylinder. The attachment will receive full hydraulic flow in direct response to the use of the control switch.

- Depress the top of the 3rd (SCV) control switch to allow flow from the circuit out the upper outlet and return to the machine through the lower outlet.
- Depress the bottom of the 3rd (SCV) control switch to allow flow from the circuit out the lower outlet and return to the machine through the upper outlet.

Open Operator Station - The IV and V rear outlet selective control valve is mechanically operated using the control levers on the right side of the machine.

- Lever controls the flow to the right-side outlets.
- Lever controls the flow to the left-side outlets.

Float Position - Float position allows implement to move up and down freely while traveling over rough ground.

- To engage float position, push control lever down.
- To disengage float position, manually return control lever to neutral position.

Rear V Selective Control Valve Continuously

- On selective control switch press position while raising control lever to the upper stop position. Switch light indicator will be on to indicate switch enabled.
- Release control lever.
- To deactivate, press position and slowly lower rear outlet lever.

Cab - The IV and V rear outlet selective control valve is mechanically operated using the control levers on the right side of the machine.

- Lever controls the flow to the lower outlets.
- Pull back on control lever for detented position used for "float" operations.
- Lever controls the flow to the upper outlets.

4044M, 4044R, 4052M, 4052R, 4066M, 4066R John Deere Rear Selective Control Valve Continuously - On selective control switch press position while pulling control lever rearward to the rear stop position. Switch light indicator will be on to indicate switch enabled.

- Release control lever.
- To deactivate press position and slowly release rear outlet lever.

Using Diverter I, II, and III Rear Outlets - If the key switch is moved to the off position, the dual SCV lever will default to operating the mid SCV outlets. The key switch must be moved to the run position and the diverter system re-activated to operate the diverter I, II, and III rear outlets.

- Press the top of the diverter I, II, and III rear outlet activation switch to activate the I, II, and III rear outlets. The switch indicator light will go on.
- Use the SCV lever to operate attachments connected to the diverter I, II, and III rear outlets.
- Press the bottom of the activation switch to disable the rear outlets. The switch indicator light will go off and the mid SCV outlets will be activated.

Relieving Pressure

To relieve pressure in the rear outlets:

- Place implement on ground.
- Engine running and diverter engaged.
- Press and hold diverter switch at location C throughout the next three steps.
- Shut off engine.
- Actuate mid SCV lever in front/back and left/right directions to relieve pressure, then put key switch back to run position.
- Actuate 3rd SCV upper and lower switches to relieve pressure.

This provides 20-30 seconds after engine shut down during which the pressure in the rear couplers can be relieved.

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