Ford 650 Gear Oil Change Guide

Maintaining Your Ford 650: A Guide to Gear Oil Changes

The Ford 650 is a robust machine, designed for demanding work. Like any vehicle, regular maintenance is key to ensuring its longevity and optimal performance. One crucial aspect of this maintenance is changing the gear oil in both the front and rear final drives. This process not only lubricates essential components but also helps to remove any accumulated debris or wear particles, preventing premature damage. This guide will walk you through the steps involved in changing the gear oil for both the front and rear final drives of your Ford 650, ensuring you have the knowledge to tackle this important task safely and effectively.

Safety First! Before embarking on any automotive maintenance, it's paramount to prioritise your safety. Always wear appropriate personal protective equipment (PPE). This includes sturdy, oil-resistant gloves to protect your skin from the gear oil and safety glasses or goggles to shield your eyes from splashes. Ensure the vehicle is parked on a level surface and the engine is switched off. Allow the vehicle to cool down if it has been recently operated, though warming the gear oil slightly can aid in easier drainage.

Front Final Gear Oil: Inspection and Change

The front final drive is responsible for delivering power to the front wheels, and its gear oil needs regular attention. Here’s how to inspect and change it:

Inspection Procedure:

• Warm the Oil: For the easiest draining, run the vehicle briefly to warm up the gear oil. This reduces its viscosity, allowing it to flow more freely.
• Prepare the Vehicle: Ensure the Ford 650 is parked on a level surface with the engine turned off.
• Access the Filler Cap: You'll need to remove the front right side inner cover and lower shroud to access the front final gear oil filler cap. Refer to the "Inner Covers" topic in your service manual for detailed instructions on removing these components.
• Locate and Remove Filler Cap: Using a 19 mm socket, carefully remove the front final gear oil filler cap.
• Inspect the O-ring: Examine the O-ring on the filler cap for any signs of wear, cracking, or damage. If it appears compromised, it's best to replace it to ensure a proper seal.
• Check the Oil Level: The correct oil level should be at the bottom of the filler cap opening. If the level is low, add the same type of oil as specified.

Oil Specifications for Front Final Drive:

The recommended oil for the front final drive is typically:

Drain Procedure:

• Remove Filler Cap: As described in the inspection section, ensure the filler cap is removed.
• Position Drain Pan: Place a suitable oil drain pan directly underneath the front differential to catch the old oil.
• Loosen Drain Plug: Using a 5 mm Allen socket, carefully loosen the drain plug. Note that earlier models of the 650 and the 700 models might require a different sized socket for the drain plug.
• Drain the Oil: Completely remove the drain plug and allow all the old gear oil to drain into the pan.
• Discard Sealing Washer: Once the oil has drained, remove the sealing washer from the drain plug. This washer should always be discarded and replaced with a new one during reassembly.

Fill Procedure:

• Install New Washer and Plug: Fit a new sealing washer onto the drain plug. Then, using the appropriate Allen socket (typically 5 mm, but confirm for your specific model year), reinstall the drain plug.
• Tighten Drain Plug: Tighten the drain plug to the manufacturer's specified torque. Refer to the table below for torque specifications:

Fastener Torque Specifications (Front Final Drive):

• Add New Oil: Carefully add the correct type and amount of differential gear oil into the filler hole. Continue filling until the oil level reaches the threads of the filler cap opening.
• Prepare Filler Cap: Apply a light coat of grease to the O-ring on the filler cap. This helps create a better seal and makes future removal easier.
• Install Filler Cap: Reinstall the filler cap, ensuring the O-ring is properly seated. Tighten the filler cap to the specified torque using a 19 mm socket.

Filler Plug Torque Specification (Front Final Drive):

• Reinstall Covers: Finally, reinstall the front right side inner cover and lower shroud that you removed earlier.

Rear Final Gear Oil: Inspection and Change

The rear final drive is equally important for your Ford 650's operation. The procedure for changing its oil is similar, but with some key differences in oil types and torque settings.

Inspection Procedure:

• Warm the Oil: As with the front drive, running the vehicle briefly to warm the oil will facilitate easier draining.
• Prepare the Vehicle: Ensure the vehicle is on a level surface and the engine is off.
• Access and Remove Filler Cap: Locate the rear final gear oil filler cap. For some models, you might need to remove covers to access it. Use a 19 mm socket to remove the filler cap.
• Inspect O-ring: Check the O-ring on the filler cap for any signs of damage and replace if necessary.
• Check Oil Level: The oil level should be even with the threads of the oil check hole. Add the specified oil if the level is low.

Oil Specifications for Rear Final Drive:

The type of oil for the rear final drive can vary slightly depending on the model year. Always consult your owner's manual for the most accurate recommendation, but common types include:

Drain Procedure:

• Position Drain Pan: Place a suitable oil drain pan beneath the rear differential.
• Remove Drain Plug: Using the correct socket (often an 8 mm Allen socket, but verify for your model), remove the drain plug and its sealing washer. Allow the fluid to drain completely.

Fill Procedure:

• Install New Washer and Plug: Fit a new sealing washer onto the drain plug. Reinstall the drain plug using an 8 mm Allen socket (or the appropriate size for your model).
• Tighten Drain Plug: Tighten the drain plug to the manufacturer's specified torque. Refer to the table below:

Fastener Torque Specifications (Rear Final Drive):

• Add New Oil: Fill the rear final drive with the correct type and quantity of gear oil. The oil level should be even with the threads of the oil check hole.
• Prepare and Install Filler Cap: Apply grease to the filler cap's O-ring. Install the filler cap with the O-ring and tighten it to the specified torque using a 19 mm socket.

Frequently Asked Questions:

Q1: How often should I change the gear oil on my Ford 650?
It's recommended to consult your Ford 650 owner's manual for the specific maintenance schedule. Generally, gear oil changes are recommended every few thousand miles or annually, whichever comes first, especially if the vehicle is used in demanding conditions.

Q2: Can I use a different type of oil if the recommended one is not available?
It is strongly advised to use only the type and viscosity of gear oil specified by the manufacturer. Using the wrong type of oil can lead to improper lubrication, increased wear, and potential damage to the gears and bearings.

Q3: What tools will I need for this job?
You will generally need a set of metric sockets (including 19 mm and potentially 5 mm or 8 mm Allen sockets), a torque wrench, an oil drain pan, gloves, safety glasses, and a funnel. You may also need rags for cleaning up spills.

Q4: What is the significance of the sealing washer?
The sealing washer is a crush washer designed to create a tight seal around the drain plug, preventing oil leaks. It deforms slightly when tightened to fill any microscopic gaps. Because it deforms, it should be replaced with a new one each time the drain plug is removed and reinstalled to ensure a proper seal.

Q5: Where can I find the "Inner Covers" information mentioned?
The "Inner Covers" topic would typically be found within the official service manual for your specific Ford 650 model year. If you don't have one, they are often available for purchase from Ford dealerships or specialist automotive repair manual suppliers.

By following these detailed instructions, you can confidently perform the essential maintenance of changing the front and rear final gear oil on your Ford 650. Regular attention to these details will contribute significantly to the overall health and performance of your vehicle.

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