FRAME-SWING 3560584 - Caterpillar

Placing the PTO Enable switch to the "Enable" position transfers the control of the desired engine speed from the throttle position sensor to the PTO speed control function. The PTO Interrupt switch momentarily transfers control back to the throttle position sensor. The PTO Set/Resume switch controls the desired engine speed.The PTO Set/Resume switch is spring loaded to the normally open position. If the switch is momentarily placed in the "Set" position, the desired engine speed will be set to the current engine speed. If the switch is held in the "Set" position, the desired engine speed will increase according to the value of the "Engine Accel Rate" parameter. After the desired engine speed has been set, the desired engine speed will increase by 20 rpm when the PTO ramp up/down switch is momentarily placed in the "Set" position.If the PTO Set/Resume switch is momentarily placed in the "Resume" position, the desired engine speed will be set to the current engine speed. If the switch is held in the "Resume" position, the desired engine speed will decrease according to the value of the "Engine Accel Rate" parameter. After the desired engine speed has been set, the desired engine speed will decrease by 20 rpm when the switch is momentarily placed in the "Resume" position.If the "PTO Set" and "PTO Resume" inputs are connected to the −Battery at the same time, the ECM will ignore the inputs. The desired engine speed will not change.Test Step 1. Inspect the Electrical Connectors and the Wiring
Turn the keyswitch to the OFF position.
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Left side view (1) P61 customer connector (1) J1/P1 ECM connectors
Thoroughly inspect connectors (1) and (2). Refer to Troubleshooting, "Electrical Connectors - Inspect".
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P1 terminals that are associated with the PTO (P1-41) Input from the PTO interrupt switch (P1-56) Input from the PTO enable switch (P1-58) Input from the PTO ramp up switch or set switch (P1-60) Input for PTO ramp down switch or resume switch
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J61/P61 terminals that are associated with the PTO (19) Input from the PTO interrupt switch (29) Input from the PTO enable switch (30) Input from the PTO ramp up switch or set switch (39) Input for PTO ramp down switch or resume switch
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuits for the PTO switches.
Check the allen head screw on each ECM connector for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.
Check the allen head screw on the customer connector for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque value.
Check the harness and wiring for abrasions and for pinch points from the battery to the ECM.Expected Result:All connectors, pins, and sockets are completely coupled and/or inserted, and the harness and wiring are free of corrosion, of abrasion or of pinch points.Results:
OK - The connectors and wiring are OK. If the engine is equipped with a customer connector, proceed to Test Step 2.