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John Deere 3120, 3320, 3520, 3720 - PTO
John Deere 3120, 3320, 3520, 3720 Tractor Rear PTO
Testing Rear PTO Knob
Sit on operator’s seat. Lock park brake. Push
all PTO engagement knobs to the disengaged/off position. PowrReverser:
Depress clutch pedal completely and move the transmission range and gear
shift levers to the N (neutral) position. Move the PTO selector lever to
the rear PTO only position. Pull the rear PTO engagement knob to the
engaged/on position. Turn key switch to start position. Engine must not
crank. Push all PTO engagement knobs to the disengaged/off position.
Turn key switch to off position.
Testing Rear PTO and Seat Switch Interface
Sit on operator’s seat. Lock park brake. Push all PTO engagement knobs to the disengaged/off position. PowrReverser: Depress clutch pedal completely and: Move the transmission range and gear shift levers into the N (neutral) position. Move the reverser lever to the center neutral position. Start John Deere 3120, 3320, 3520, 3720 engine. Move the PTO selector lever to the rear PTO only position. PowrReverser: Release clutch pedal. Pull the rear PTO engagement knob to the engaged/on position. Raise up from operator’s seat. Do not dismount machine. Engine should stop. Push all PTO engagement knobs to the disengaged/off position. Turn key switch to off position.
Engaging Rear PTO
Stop machine motion and Move the reverser lever to neutral position, and push all PTO engagement knobs to the disengaged/off position (John Deere 3120, 3320, 3520, 3720 with PowrReverser). Remove foot from forward and reverse travel pedals, and push all PTO engagement knobs to the disengaged/off position (eHydro model). The starter will not crank if the rear/mid PTO knob is pulled to the engaged/on position. If the operator leaves the seat with the engine running and the rear/mid PTO engaged, the safety interlock system will stop the engine and all implements. Reduce throttle setting to 1500 rpm. Move the PTO selector lever to top/rearward position for rear PTO only. Pull the rear PTO engagement knob to the engaged/on position to engage the rear PTO. The instrument panel PTO engaged light will illuminate when the rear PTO is engaged. Adjust the hand throttle lever forward to the desired speed for implement used. The PTO marker on the tachometer indicates engine speed for a standard 540 PTO. Disengaging Rear PTO - Adjust engine rpm to low idle. Push all PTO engagement knobs to the disengaged/off position to disengage the rear PTO. The instrument panel PTO engaged light will go out when the rear PTO is disengaged.
Engaging Rear PTO
Move transmission to neutral position: Depress clutch pedal completely and move the transmission gear and range shift levers and the reverser lever to the N (neutral) position (John Deere 3120, 3320, 3520, 3720 tractor with PowrReverser). Move the range shift lever to the N (neutral) position (John Deere 3120, 3320, 3520, 3720 tractor with eHydro). Lock park brake. Push all PTO engagement knobs to the disengaged/off position. The starter will not crank if the rear/mid PTO engagement knob is pulled to the engaged/on position. Start the John Deere 3120, 3320, 3520, 3720 engine and adjust speed to 1500 rpm. Move the PTO selector lever to top/rearward position for rear PTO only. Get off the operator’s seat. Pull the rear PTO engagement knob to the engaged/on position to engage the rear PTO. The engine should continue to run. The instrument panel PTO engaged light will illuminate when the rear PTO is engaged. Adjust the hand throttle lever forward to the desired speed for implement used. The PTO marker on the tachometer indicates engine speed for a standard 540 PTO. Disengaging Rear PTO - Adjust engine rpm to low idle. Push all PTO enagement knobs to the disengaged/off position. The instrument panel PTO engaged light will go out when the rear PTO is disengaged.
Testing Rear PTO and Park Brake Interface
Push all PTO engagement knobs to the disengaged/off position. PowrReverser: Depress clutch pedal completely and: Move the transmission range and gear shift levers into the center N (neutral) position. Move the reverser lever to the center neutral position. Start JD 3120, 3320, 3520, 3720 tractor engine. Set engine speed at 1500 rpm. PowrReverser: Release clutch pedal. Raise up from operator’s seat. Do not dismount machine. Pull the rear PTO engagement knob to the engaged/on position. Rear PTO should operate. Unlock park brake. Engine should stop. Push all PTO engagement knobs to the disengaged/off position. Turn key switch to off position. Using Rear and Mid-PTO (Operator on Seat) - The mid-PTO is available as optional equipment, and is only operational with the operator on the seat. The PTO selector lever has three operating positions: Top (tractors without a cab) or rearward (for tractors with a cab) for rear PTO only. Bottom (tractors without a cab) or forward (for tractors with a cab) for mid-PTO only. Center for both rear and mid-PTO at the same time.
Using Rear PTO (Operator off Seat)
The rear PTO can be engaged with the operator off the seat. The Safety Interlock System will stop the engine and all implements if the mid-PTO is engaged and the operator gets off the seat. The PTO selector lever has three operating positions: Top (tractors without a cab) or rearward (for tractors with a cab) for rear PTO only. Bottom (tractors without a cab) or forward (for tractors with a cab) for mid-PTO only. Center for both rear and mid-PTO at the same time.
John Deere 3120, 3320, 3520, 3720 Tractor Mid-PTO
Testing Mid-PTO and Seat Switch Interface
Push all PTO engagement
knobs to the disengaged/off position. PowrReverser: Depress clutch pedal
completely and: Move the transmission range and gear shift levers into
the N (neutral) position. Move the reverser lever to the center neutral
position. Start engine. Set engine speed at 1500 rpm. PowrReverser:
Release the clutch. Move the PTO selector lever to the mid-PTO only
position. Pull the mid-PTO knob to the engaged/on position. Raise up
from operator’s seat. Do not dismount machine. Engine should stop. Push
all PTO engagement knobs to the disengaged/off position. Start engine.
Set engine speed at 1500 rpm. Move the PTO selector lever to the mid and
rear PTO position. Pull the PTO engagement knob to the engaged/on
position. Raise up from operator’s seat. Do not dismount machine. Engine
should stop. Push all PTO engagement knobs to the disengaged/off
position. Turn key switch to off position.
Engaging Mid-PTO
Sit on operator’s seat. Stop machine motion and
Move the reverser lever to neutral position (PowrReverser model). Or
Remove foot from forward and reverse travel pedals (eHydro model). Push
all PTO engagement knobs to the disengaged/off position. The starter
will not crank if the rear/mid PTO engagement knob is pulled to the
engaged/on position. If the operator leaves the seat with the engine
running and the rear PTO engaged, the safety interlock system will stop
the engine and all implements. Reduce throttle setting to 1500 rpm. The
PTO selector lever has three operating positions: Top (JD 3120, 3320,
3520, 3720 tractors without a cab) or rearward (for JD 3120, 3320, 3520,
3720 tractors with a cab) for rear PTO only. Bottom (tractors without a
cab) or forward (for tractors with a cab) for mid-PTO only. Center for
both rear and mid-PTO at the same time. Move the PTO selector lever to
bottom/forward position for mid-PTO only. Pull the mid-PTO engagement
knob to the engaged/on position. The instrument panel PTO engaged light
will illuminate when the mid-PTO is engaged. Adjust the hand throttle
lever forward to the desired speed for implement used. The PTO marker on
the tachometer indicates engine speed for a standard 540 PTO. At 540 rpm
rear PTO, mid-PTO speed will be 2100 rpm.
Disengaging Mid-PTO
Adjust John Deere 3120, 3320, 3520, 3720 engine rpm to low
idle. Push the mid-PTO engagement knob to the disengaged/off position to
disengage the mid-PTO. The instrument panel PTO engaged light will go
out when the mid-PTO is disengaged. Engaging Both Rear PTO and Mid-PTO
at Same Time - Push all PTO engagement knobs to the disengaged/off
position. The starter will not crank if the PTO engagement knob is
pulled to the engaged/on position. If the operator leaves the seat with
the engine running and the rear PTO engaged, the safety interlock system
will stop the engine and all implements. Reduce throttle setting to 1500
rpm. Move the PTO selector lever to center position to operate both rear
PTO and mid-PTO at the same time. Pull the PTO engagement knob to the
engaged/on position. Two instrument panel PTO engaged lights will
illuminate when both PTO’s are engaged. Adjust the hand throttle lever
forward to the desired speed for implement used. The PTO marker on the
tachometer indicates engine speed for a standard 540 PTO. At 540 rpm
rear PTO, mid-PTO speed will be 2100 rpm.
- JD 3120, 3320, 3520, 3720 Engine
- JD 3120, 3320, 3520, 3720 Transmission
- JD 3120, 3320, 3520, 3720 PTO
- JD 3120, 3320, 3520, 3720 Brakes and Wheels
- JD 3120, 3320, 3520, 3720 Hydraulic and Hitch
- JD 3120, 3320, 3520, 3720 Operating
- JD 3120, 3320, 3520, 3720 Troubleshooting
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