Ultimate Guide to PTO and Brake System Maintenance | Farmall 856 Restoration

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Learn the ins and outs of maintaining the PTO and brake system in your Farmall 856 tractor with this comprehensive guide. From disassembling components to adjusting preload, this article covers it all.

Accessing Internal Components

⚙️The PTO unit consists of an oil inlet, input shaft, hydraulic pump, clutch pack, and gear sets.

⚙️The unit has both a 540 RPM and a 1,000 RPM PTO shaft for different speed options.

⚙️The first step is to remove the pump and its housing to access the internal components.

Clutch Replacement and Disassembly

🔧Worn clutch discs and burned inner plates indicate the need for replacement.

🔧Consideration of replacing piston seals and other components due to clutch damage.

🔧Using a homemade tool to compress a spring for disassembly of the clutch unit.

Cleaning and Seal Replacement

🧼Disassembling PTO components for cleaning and seal replacement

🧼Noting the presence of sludge and the need for thorough cleaning before reassembly

🧼Identifying and removing various parts like snap rings, bearings, and bushings

Adjusting Preload and Brake System

🔩Shims are used to adjust preload on cone bearings in the PTO system.

🔩The brake piston is found in a casting with sludge buildup, indicating potential issues.

🔩The brake system operates similar to a clutch pack, utilizing pressure to engage components.

FAQ

What are the signs that indicate the clutch pack needs replacement?

Worn clutch discs and burned inner plates are clear indicators of the need for replacement.

How can I ensure thorough cleaning before reassembly?

Note the presence of sludge and take the time to clean all components meticulously.

What tools are needed for disassembling the clutch unit?

A homemade tool to compress the spring is essential for proper disassembly.

Why is adjusting preload important in the PTO system?

Shims are used to ensure proper alignment and functioning of cone bearings.

How does the brake system engage components?

Similar to a clutch pack, the brake system utilizes pressure to engage components for operation.

Can worn piston seals affect the clutch performance?

Yes, worn piston seals can lead to clutch damage and may require replacement.

What components should be identified and removed during cleaning?

Various parts like snap rings, bearings, and bushings should be identified and removed for thorough cleaning.

Why is it important to replace worn washers on bolts?

Worn washers can affect shifting and steering wheel performance, so replacing them is crucial.

How does the brake piston's condition affect the brake system?

Sludge buildup on the brake piston can indicate potential issues in the brake system that need attention.

What is the correct assembly order to avoid rework?

Following the correct assembly order is crucial to avoid rework and ensure proper functioning of components.

Summary with Timestamps

⚙️ 0:35Disassembling the PTO unit and brakes on a farm tractor for restoration purposes.

⚙️ 4:44Examining worn-out clutch components and considering further repairs in a farm equipment restoration project.

⚙️ 9:14Disassembling PTO components for cleaning and seal replacement in a Farmall 856 restoration project.

⚙️ 15:18Exploring the inner workings of the tractor's PTO system and brakes, uncovering sludge and sticky parts.

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