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#11
09-19-2020, 09:51 AM
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Cub Cadet 2135 Safety Circuit Explained Part Two
A description of the Relay shown with 3 pictures:
#3enlarged reverse relay schematic.jpg #9illustrated relay1.jpg A flexible piece of spring steel at point D extends down to the contact points just above B. It is riveted to a heavier piece of steel, A. The spring steel forces the contact to press against the surface of C which is the internal part of the external terminal G, shown in another picture. There is continuity from terminal G to terminal E whenever the Key is turned off OR the Travel Pedal is in reverse. This is called the normally closed (NC) state of a relay. Since there is no harness wire connected to terminal G, it serves no purpose. As soon as the Key is turned to the Run Position, voltage is supplied to terminal F through the Reverse Switch. Terminal H provides the ground back to the battery and the coil becomes energized. The magnetic force created by the copper-wound coil, which is to the right of A, pulls the steel plate, A, towards the coil and the contact now is joined to tab J which is the interior portion of terminal D. This tab, J, was removed to better see the parts lettered A through E. #2illustrated relay2.jpg #9illustrated relay1.jpg With the contact in this position, there is continuity between terminals F and D and E. As long as voltage is supplied to terminal F, through the Reverse Switch, with the Travel Pedal in neutral or forward, the PTO clutch will operate. The safety part of the circuit comes into play when the operator moves the travel pedal to reverse. The voltage supplied to terminal F will cease, the unpowered magnetic coil will release plate A, and the contact, B, will move back to position C. There will no longer be a pathway to ground from the PTO clutch and it will immediately turn off. Description of the PTO circuit with the PTO Switch turned OFF #12pto off illustrated.jpg Power begins at the battery and travels to the PTO Clutch and continues through the blue wire to terminal #6 of the PTO Switch. Power also goes through the normally closed (NC) Reverse Switch to the positive side of the Reverse Relay coil. Since the PTO Switch is OFF, a ground path exists between terminals #5 and #7 of the PTO switch, continuing to the Reverse Relay brown wires which travel through the closed contact and back to the battery ground. #15pto switch illustrated.jpg #15relay closed.jpg Description of the PTO circuit with the PTO Switch turned On #13pto on illustrated.jpg Power begins at the battery and travels to the PTO Clutch and continues through the blue wire to terminal #6 of the PTO Switch. Power also goes through the normally closed (NC) Reverse Switch to the positive side of the Reverse Relay coil. Since the PTO Switch is ON, power travels through terminal #7 of the PTO Switch, through the Reverse Relay brown wires, through the closed relay contact and back to the battery ground. The PTO clutch turns ON. Description of the PTO circuit with the PTO Switch turned On Travel Pedal in Reverse#14pto on, reverse.jpg Power flow described above in the "Description of the PTO circuit with the PTO Switch turned On" is interrupted when the Travel Pedal is put into reverse. The power that once powered the Reverse Relay coil through the Reverse Switch is now cut off because the switch has opened up. With no power to the Reverse Relay coil, the contact that once completed the ground, has opened up and there is no way to complete the ground circuit of the PTO Clutch, which then shuts off. I have a personal observation about this circuit. The only change that happened was that the Reverse Switch opened up. The PTO switch remains ON and connected to the Reverse Relay. I would think that as soon as the pedal was moved to forward and the Reverse Switch was again powering the Reverse Relay that the PTO would start up again, but it doesn't. The PTO switch has to be turned off and back on again. Description of the Starting Circuit and the Seat Safety System #17brake, seat, pto safety.jpg The start circuit involves the Brake Pedal switch, and/or the Seat Switch, and the PTO switch. It's fairly common among all riding mowers. These instructions assume the Key Switch is working properly in the start position. With the PTO switch turned OFF, power travels through terminals #1 and #2 of the PTO switch. #15pto switch illustrated.jpg It continues on to the (NO) contact of the Brake Switch which means that if the Brake Pedal is UP, the switch is open and the voltage can not continue. Once the Brake Pedal is depressed, the switch closes and voltage continues to the Solenoid as a blue wire. The voltage from the blue wire causes a coil to pull a set of heavy duty contacts together and send voltage to the Starter. If the Starter is not cranking at all and the battery is charged up, and there is 12VDC at the blue wire, you can rule out the Brake Switch and PTO switch as the problem. If there is no voltage at the blue wire with the Key Switch turned to the start position, then there could be a faulty PTO switch or Brake Switch. If there is power at the blue wire, check the large terminal that holds the cable FROM the battery. There should be 12VDC at that terminal at all times. With the key turned to Start, there should be voltage on the other large terminal of the solenoid which goes to the starter. If not, the Solenoid is bad. If voltage is present, then the starter is bad or not grounded properly. At the same time, the Brake Switch also has a normally closed (NC) contact. If the pedal is up, the Ignition Magneto is grounded. Depressing the brake not only allows power to go to the Starter circuit, it also removes the ground from the Magneto. The ground from the battery travels to the Brake Switch and when the pedal is UP, it travels through the switch, to the yellow wire, to the normally closed (NC) seat switch and on to the Magneto and grounding it. With the Brake Pedal depressed, the path to ground is broken and the Magneto will spark. Another way to break the ground to the Magneto is by sitting on the seat. The normally closed (NC) seat switch will open up the ground connection. Once the mower is running and the PTO switch is engaged, there is another safety factor. #15pto switch illustrated.jpg Terminals #2 and #3 are connected by the PTO switch and the battery ground now extends to the yellow wire of one side of the Seat Switch. With enough weight on the seat, the Seat Switch is open and the ground cannot reach the Magneto unless the operator gets off the seat or leans too far without engaging the Parking Brake. But if the operator gets off the seat or leans too far with the PTO switch ON, the ground will travel through the Seat Switch to the Magneto and ground it. 
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#12
09-19-2020, 10:06 AM
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A description of the Relay shown with 3 pictures:
#9illustrated relay1.jpg #3enlarged reverse relay schematic.jpg A flexible piece of spring steel at point D extends down to the contact points just above B. It is riveted to a heavier piece of steel, A. The spring steel forces the contact to press against the surface of C which is the internal part of the external terminal G, shown in another picture. There is continuity from terminal G to terminal E whenever the Key is turned off OR the Travel Pedal is in reverse. This is called the normally closed (NC) state of a relay. Since there is no harness wire connected to terminal G, it serves no purpose. As soon as the Key is turned to the Run Position, voltage is supplied to terminal F through the Reverse Switch. Terminal H provides the ground back to the battery and the coil becomes energized. The magnetic force created by the copper-wound coil, which is to the right of A, pulls the steel plate, A, towards the coil and the contact now is joined to tab J which is the interior portion of terminal D. This tab, J, was removed to better see the parts lettered A through E. #2illustrated relay2.jpg #9illustrated relay1.jpg With the contact in this position, there is continuity between terminals F and D and E. As long as voltage is supplied to terminal F, through the Reverse Switch, with the Travel Pedal in neutral or forward, the PTO clutch will operate. The safety part of the circuit comes into play when the operator moves the travel pedal to reverse. The voltage supplied to terminal F will cease, the unpowered magnetic coil will release plate A, and the contact, B, will move back to position C. There will no longer be a pathway to ground from the PTO clutch and it will immediately turn off. Description of the PTO circuit with the PTO Switch turned OFF #12pto off illustrated.jpg Power begins at the battery and travels to the PTO Clutch and continues through the blue wire to terminal #6 of the PTO Switch. Power also goes through the normally closed (NC) Reverse Switch to the positive side of the Reverse Relay coil. Since the PTO Switch is OFF, a ground path exists between terminals #5 and #7 of the PTO switch, continuing to the Reverse Relay brown wires which travel through the closed contact and back to the battery ground. #15relay closed.jpg #15pto switch illustrated.jpg Description of the PTO circuit with the PTO Switch turned On #13pto on illustrated.jpg Power begins at the battery and travels to the PTO Clutch and continues through the blue wire to terminal #6 of the PTO Switch. Power also goes through the normally closed (NC) Reverse Switch to the positive side of the Reverse Relay coil. Since the PTO Switch is ON, power travels through terminal #7 of the PTO Switch, through the Reverse Relay brown wires, through the closed relay contact and back to the battery ground. The PTO clutch turns ON. Description of the PTO circuit with the PTO Switch turned On Travel Pedal in Reverse#14pto on, reverse.jpg Power flow described above in the "Description of the PTO circuit with the PTO Switch turned On" is interrupted when the Travel Pedal is put into reverse. The power that once powered the Reverse Relay coil through the Reverse Switch is now cut off because the switch has opened up. With no power to the Reverse Relay coil, the contact that once completed the ground, has opened up and there is no way to complete the ground circuit of the PTO Clutch, which then shuts off. I have a personal observation about this circuit. The only change that happened was that the Reverse Switch opened up. The PTO switch remains ON and connected to the Reverse Relay. I would think that as soon as the pedal was moved to forward and the Reverse Switch was again powering the Reverse Relay that the PTO would start up again, but it doesn't. The PTO switch has to be turned off and back on again. Description of the Starting Circuit and the Seat Safety System #17brake, seat, pto safety.jpg The start circuit involves the Brake Pedal switch, and/or the Seat Switch, and the PTO switch. It's fairly common among all riding mowers. These instructions assume the Key Switch is working properly in the start position. With the PTO switch turned OFF, power travels through terminals #1 and #2 of the PTO switch. #15pto switch illustrated.jpg It continues on to the (NO) contact of the Brake Switch which means that if the Brake Pedal is UP, the switch is open and the voltage can not continue. Once the Brake Pedal is depressed, the switch closes and voltage continues to the Solenoid as a blue wire. The voltage from the blue wire causes a coil to pull a set of heavy duty contacts together and send voltage to the Starter. If the Starter is not cranking at all and the battery is charged up, and there is 12VDC at the blue wire, you can rule out the Brake Switch and PTO switch as the problem. If there is no voltage at the blue wire with the Key Switch turned to the start position, then there could be a faulty PTO switch or Brake Switch. If there is power at the blue wire, check the large terminal that holds the cable FROM the battery. There should be 12VDC at that terminal at all times. With the key turned to Start, there should be voltage on the other large terminal of the solenoid which goes to the starter. If not, the Solenoid is bad. If voltage is present, then the starter is bad or not grounded properly. At the same time, the Brake Switch also has a normally closed (NC) contact. If the pedal is up, the Ignition Magneto is grounded. Depressing the brake not only allows power to go to the Starter circuit, it also removes the ground from the Magneto. The ground from the battery travels to the Brake Switch and when the pedal is UP, it travels through the switch, to the yellow wire, to the normally closed (NC) seat switch and on to the Magneto and grounding it. With the Brake Pedal depressed, the path to ground is broken and the Magneto will spark. Another way to break the ground to the Magneto is by sitting on the seat. The normally closed (NC) seat switch will open up the ground connection. Once the mower is running and the PTO switch is engaged, there is another safety factor. #15pto switch illustrated.jpg Terminals #2 and #3 are connected by the PTO switch and the battery ground now extends to the yellow wire of one side of the Seat Switch. With enough weight on the seat, the Seat Switch is open and the ground cannot reach the Magneto unless the operator gets off the seat or leans too far without engaging the Parking Brake. But if the operator gets off the seat or leans too far with the PTO switch ON, the ground will travel through the Seat Switch to the Magneto and ground it.
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#13
05-29-2021, 09:44 AM
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ignition switch
My ignition switch doesn't shut off engine in off position , what could be wrong?
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#14
05-29-2021, 09:49 AM
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Quote:
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#15
05-29-2021, 12:50 PM
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Quote:
Follow the wiring diagram systematically one point to the next, it will be very obvious when you find the place where current does not flow, or flows where it should not. Sorry, but we cannot do that for you, it is physically impossible. For your own sake do not just throw parts at it without knowing the actual problem unless you have an abundance of cash to spend.
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Cub Cadet is a premium line of outdoor power equipment, established in 1961 as part of International Harvester. During the 1960s, IH initiated an entirely new line of lawn and garden equipment aimed at the owners rural homes with large yards and private gardens. There were a wide variety of Cub Cadet branded and after-market attachments available; including mowers, blades, snow blowers, front loaders, plows, carts, etc. Cub Cadet advertising at that time harped on their thorough testing by "boys - acknowledged by many as the world's worst destructive force!". Cub Cadets became known for their dependability and rugged construction.
MTD Products, Inc. of Cleveland, Ohio purchased the Cub Cadet brand from International Harvester in 1981. Cub Cadet was held as a wholly owned subsidiary for many years following this acquisition, which allowed them to operate independently. Recently, MTD has taken a more aggressive role and integrated Cub Cadet into its other lines of power equipment.
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