Trystan Casey
Removing an electric clutch from a Gravely ZTR mower can be a challenging task. Several factors can contribute to clutch engagement problems, including wiring issues, voltage fluctuations, damaged diodes, and faulty switches. Troubleshooting methods include checking voltage, testing continuity, inspecting fuses, and examining the seat safety pressure switch. When removing the clutch, penetrating oil can be sprayed on the crank shaft, which should be tapped and rotated while hammering. While some suggest using a puller, others advise against it due to the clutch's rounded edge. An alternative approach involves starting the engine with a loosened retaining bolt.
Steps to remove the electric clutch from a Gravely mower:
| Characteristics | Values |
|---|---|
| Step 1 | Spray penetrating oil on the crank shaft and tap it along with the clutch a few times over the course of a week. |
| Step 2 | Rotate and hammer the crank shaft. |
| Step 3 | Use an air hammer to remove the clutch. |
| Troubleshooting | If the clutch is not engaging, check the wiring, fuses, and voltage. |
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What You'll Learn
Spray penetrating oil on the crank shaft and tap it
To remove the electric clutch from a Gravely ZTR mower, one recommended method is to spray penetrating oil on the crank shaft several times a day for a week and tap it from time to time. This will help to loosen the crank shaft, making it easier to remove the clutch.
When removing the clutch, it is important to keep the shaft rotating as you hammer it off. A puller is not recommended as the clutch has a rounded edge, and the puller may slide off.
One person recommended using an air hammer to remove the clutch, which they had success with when working at a Gravely dealership. Another person suggested starting the engine with a loosened retaining bolt, although this may not be suitable for all mowers.
It is important to note that the clutch may come off in pieces, so it is recommended to be careful and take your time when attempting to remove it.
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Use an air hammer
To remove the electric clutch from a Gravely ZTR mower, one method is to use an air hammer. This is a tool that can be used to separate the clutch from the crank shaft. Before using the air hammer, it is recommended to spray penetrating oil on the crank shaft several times a day for a week, tapping the crank shaft and clutch occasionally. This will help to loosen the connection.
When using the air hammer, it is important to keep the tool rotating as you work it off. This will ensure an even application of force and help prevent damage to the clutch or crank shaft. The air hammer delivers rapid blows, which can generate heat, so it is important to keep the tool moving to avoid any potential damage caused by friction or heat.
The air hammer is a more powerful tool than a manual hammer, and its use should be approached with caution. It is important to wear appropriate safety gear, including eye protection and gloves, when operating an air hammer. Additionally, ensure that the air hammer is securely attached to the air compressor and that the compressor is turned off when not in use.
Using an air hammer can be an effective method for removing the electric clutch from a Gravely ZTR mower. However, it is a specialised tool, and alternative methods, such as using a hydraulic gear puller or a custom puller, may also be considered based on individual preferences and accessibility to tools.
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Check the wiring
When troubleshooting issues with your Gravely electric clutch, it is important to check the wiring to ensure there are no disruptions in the electrical circuit. Here are some detailed steps to guide you through the process:
Check the Voltage
Use a voltmeter to measure the voltage across the connector when the switch is turned on and off. With the PTO disconnected, the voltage should be higher (around 14 volts) and drop to 0 volts when the switch is off. If the voltage readings are inconsistent or lower than expected, there may be an issue with the power supply or a disruption in the wiring.
Inspect the Wires
Visually inspect the wiring harness for any signs of damage or wear. Look for exposed wires or cuts in the insulation, as this can cause short circuits or disruptions in the electrical flow. Ensure that all connections are secure and free of corrosion. If there is any debris or corrosion on the terminals, clean them using a suitable cleaning agent and a soft brush.
Test Continuity
Perform a continuity test to check for any breaks or high-resistance points in the wiring circuit. Disconnect the wiring harness and test for continuity between the negative battery terminal and various spots on the frame and engine. You can use a multimeter set to the continuity setting for this test. If there is a break in the circuit, the test will indicate a loss of continuity.
Check Fuses
Locate the fuses in the wiring harness and inspect them for any signs of damage. Look for blown or blackened fuses, as this indicates that they need to be replaced. Ensure that the fuses are of the correct type and amperage rating for your Gravely equipment.
Understand the Circuitry
In some Gravely electric clutches, there may be a "`feedback loop'" in the wiring. This includes a diode that connects the ground to the hot wire for the clutch. If this diode is damaged or malfunctioning, it can affect the normal operation of the clutch. Consult a professional or refer to a schematic if you need to replace or understand this circuitry.
Remember to exercise caution when working with electrical systems. Always disconnect the power source before handling any electrical components, and ensure you have the necessary knowledge and equipment for safe troubleshooting.
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Test the battery voltage
To test the battery voltage, you will need to perform a series of steps to ensure that the electrical system is functioning correctly and that there are no issues with the voltage or current. Here is a comprehensive guide on how to do this:
Firstly, it is important to check the voltage at different points in the system. Measure the voltage at the battery terminals using a voltmeter, ensuring that the battery is disconnected from the circuit. This will give you a baseline voltage reading. In one case, the battery voltage was measured to be 12.74 volts, indicating a healthy battery.
Next, inspect the voltage at the PTO connector. With the PTO disconnected, the voltage should match the battery voltage. If the PTO is connected, there should be a voltage drop, but it should not be significant. In one example, the voltage at the connector dropped to fractions of a volt when the PTO was connected, indicating a potential issue between the battery and the PTO.
Additionally, examine the voltage at different throttle positions. The voltage should vary depending on the throttle position, and this test will help determine if the voltage supply is consistent and responsive to throttle changes. One individual reported voltage readings between 11.75 and 13.6 DC volts, depending on the throttle position.
It is also crucial to test the voltage at the clutch input terminals. Connect the clutch input terminals to the battery positive and negative terminals, respectively, and measure the voltage. This test will help confirm if the clutch is receiving the correct voltage.
Finally, verify the voltage at other components in the circuit, such as the stator wires and the voltage regulator/rectifier. These components should have specific voltage readings, indicating proper functioning. For instance, the AC voltage from the stator wires should typically be higher than the battery voltage, as observed in one case where the reading was 33.43 AC volts.
By conducting these tests, you can ensure that the battery voltage is within the appropriate range and that the electrical system, including the clutch, is functioning correctly.
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Use a hydraulic gear puller
Removing the electric clutch from a Gravely ZTR model can be a challenging task, and one effective method is to use a hydraulic gear puller. Here is a step-by-step guide on how to use a hydraulic gear puller to remove the electric clutch:
Prepare the Necessary Tools and Materials
Firstly, ensure you have the right tools and materials on hand. In addition to the hydraulic gear puller, you may also need penetrating oil, a crank shaft, a hammer, and safety gear such as gloves and eye protection.
Apply Penetrating Oil
Before attempting to remove the clutch, it is recommended to spray penetrating oil on the crank shaft and clutch assembly. Do this 3-4 times a day for a week, tapping the crank shaft and clutch occasionally to help loosen them. This process will make it easier to remove the clutch and prevent damage.
Set Up the Hydraulic Gear Puller
Refer to the instructions provided with your hydraulic gear puller to set it up correctly. Ensure that the puller is securely attached to the clutch and that all safety measures are in place.
Operate the Hydraulic Gear Puller
Once the puller is securely in place, you can begin the process of removing the clutch. Slowly apply pressure with the hydraulic gear puller, following the manufacturer's instructions. This process should create enough force to separate the clutch from the shaft.
Clean and Inspect the Components
After removing the clutch, take the time to clean and inspect all components. This includes the clutch, crank shaft, and any other parts that were involved in the removal process. Look for any signs of damage or wear, and replace any parts that are no longer serviceable.
It is important to note that the process of removing an electric clutch can vary depending on the specific model and its unique characteristics. Always refer to the manufacturer's guidelines and consult a professional if you are unsure about any steps.
Additionally, it is worth mentioning that some users have reported challenges with using pullers on certain clutch designs due to rounded edges. In such cases, alternative methods, such as using an air hammer or creating custom pullers, may be explored.
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Frequently asked questions
To remove the electric clutch from your Gravely mower, spray penetrating oil on the crank shaft and tap it a few times. Rotate the crank shaft as you hammer it off.
You can use a hydraulic gear puller or an air hammer to remove the clutch.
If a puller doesn't work, you can try spraying penetrating oil on the crank shaft and tapping it a few times.
There could be an issue with the wiring between the battery and the clutch, or the PTO switch may need to be replaced.
You should check the voltage, fuses, safety switches, and wiring. You can also try adjusting the air gap on the clutch and replacing the relay.
