Tools & PPE
- PPE: safety glasses, nitrile or mechanic gloves, steel-toe boots, long sleeves.
- Tools: metric socket set (8–24 mm), combination wrenches, breaker bar, torque wrench, screwdriver set, pliers, penetrating oil (PB Blaster), shop rags, drain pan, funnel, coolant, anti-seize compound, threadlocker (blue), jack and stands or ramps (if needed), fan-puller (universal), adjustable fan clutch wrench (if viscous clutch), pry bar (careful), work light.
- Consumables/parts (typical): replacement fan blade assembly or viscous fan clutch, fan hub bolts (replace if corroded), fan belt(s) if worn, anti-seize, gasket or O-ring if fan mounts through a water pump cover, coolant (correct MF spec or 50/50 ethylene glycol / distilled water), new hose clamps if needed.
- Reference: factory service manual for exact diagrams and torque specs.

Safety precautions (non-negotiable)
- Work only on a completely cool engine. Hot coolant or fan can cause severe injury.
- Park tractor on level ground, engage parking brake, chock wheels.
- Disconnect negative battery cable to avoid accidental starter engagement if you will be reaching near the front pulley.
- Support heavy components (radiator/shroud) with a stand or helper before unbolting them — they can fall and injure you.
- Never spin the engine while hands or tools are near the fan.

Overview of common fan types on MF3600 series and approach
- Direct-bolted fan (fan blades bolted to water pump or pulley): remove bolts, pull fan assembly off shaft.
- Viscous/thermal clutch fan: fan bolts to clutch; clutch bolts to pulley — may require a fan clutch wrench and fan puller.

Step-by-step: removal
1. Preparation
- Ensure engine is cool, battery negative disconnected, wheels chocked.
- Raise hood/bonnet; remove any grill or upper panels that block access to radiator and fan shroud.
- Place drain pan under radiator petcock if you will lower coolant level — not always necessary to drain to remove fan, but lower coolant level below the fan hub if the fan is seated deep.

2. Remove fan belt(s)
- Loosen the alternator/tensioner and relieve belt tension. Remove belt from pulleys and set aside. Note belt routing or take a photo.

3. Remove fan shroud (if present)
- Unbolt or unclip shroud halves and carefully lift away. Support the shroud; it may be heavy and is often attached to the radiator.

4. Inspect configuration
- Determine if fan is direct-bolted or clutch-mounted. Identify bolt heads and access holes.

5. Apply penetrating oil
- Spray penetrating oil on hub bolts and let soak 10–15 minutes if corroded.

6a. Removing a direct-bolted fan
- Use the correct socket on the fan-to-hub bolts. Break loose bolts with a breaker bar while preventing pulley rotation (use a block of wood on the flywheel side or have an assistant hold pulley stationary).
- Remove bolts in a star pattern. If fan is tight on the taper, use a fan puller: thread puller bolts into fan blade bolt holes and use center screw to push against shaft/hub to free the fan.
- Carefully lift fan straight out, avoiding radiator fins and hoses. Set fan on a protected surface.

6b. Removing a viscous clutch fan
- Use a fan clutch holding tool on the water pump pulley and a suitable wrench on the clutch nut. Some MF tractors require the pulley to be held stationary; others use a large center nut accessible through the fan.
- If clutch nut is left-handed thread on some models, confirm direction before loosening. Use a fan puller if the clutch is stuck on the shaft.
- Remove clutch and fan as an assembly if pivoting or unbolting the clutch from the fan is needed.

7. Inspect mounting face, bolts, bearings
- Check the water pump shaft, pulley, and threads for damage. Inspect fan blades for cracks, bent blades, corrosion. Replace if any damage present.
- If bolts are corroded or stretched, replace them.

Step-by-step: installation
8. Clean and prepare mating surfaces
- Clean shaft, hub, and bolt threads. Apply anti-seize to bolts and light anti-seize to splines where appropriate (follow manual). Use threadlocker where specified by manufacturer.

9a. Install direct-bolted fan
- Position fan onto shaft/pulley. Insert bolts finger-tight in a star pattern. Tighten gradually in sequence to the manufacturer torque spec (consult service manual). If you do not have the manual, tighten evenly and securely, then obtain proper spec — do not rely on guesswork.

9b. Install viscous clutch fan
- Bolt clutch to fan or slide clutch onto shaft and torque clutch nut to spec. Ensure correct orientation of viscous clutch (check markings). Reinstall any retaining spacers or washers per manual.

10. Reinstall shroud and belts
- Refit fan shroud, ensuring clearance between fan blades and shroud (fan should be centered). Reinstall belt(s) with proper routing and tension — set to manufacturer tension using gauge if available.

11. Refill and bleed cooling system (if coolant was drained or air entered)
- Refill radiator with correct coolant mixture. Open bleed screw(s) and run engine to operating temperature with cap off to expel air. Cycle heater controls to purge heater hose air. Top up as necessary.

12. Final checks
- Reconnect battery negative. Start engine, observe fan operation and listen for unusual noises or wobble. Check for leaks, belt alignment, and correct fan blade clearance. Re-torque bolts after a short test run if recommended by manual.

How the specialized tools are used
- Fan puller: threads into the fan’s bolt holes; its center screw presses against the shaft or pulley to pull the fan straight off the taper, preventing damage to the fan or shaft.
- Fan clutch wrench/holding tool: holds pulley stationary while loosening the clutch nut; prevents the pulley/water pump from rotating.
- Torque wrench: critical for final tightening of fan bolts to specified torque to avoid loosening or overstressing bolts.

Replacement parts commonly required
- Fan blade assembly (if cracked, bent, or corroded).
- Viscous/thermal fan clutch (if slipping, leaking fluid, or losing viscous damping).
- Mounting bolts, washers, and any seals or O-rings disturbed.
- Fan belt(s) and sometimes radiator hoses if aged.
- Coolant if drained; gaskets if water pump cover removed.

Common pitfalls and how to avoid them
- Working on a hot engine — always wait until cool.
- Damaging radiator fins or hoses when removing/installing fan and shroud — support components and use gentle leverage.
- Stripping or breaking old corroded bolts — soak with penetrating oil, heat at the nut if safe, use correct-sized sockets, and replace old bolts.
- Forgetting to center the fan in the shroud — results in noise, inefficient cooling, or blade contact.
- Not bleeding the cooling system — causes overheating from air pockets.
- Over-tightening bolts without torque spec — can strip threads or warp fan; use a torque wrench and factory values.
- Reinstalling with incorrect belt tension — too loose causes slippage; too tight stresses bearings.
- Reusing a failing viscous clutch — if clutch shows leaks, excessive play, or no damping, replace it.

Testing after service
- With engine at operating temperature, verify fan engages (if viscous) and runs smoothly. Monitor coolant temperature under load (PTO or light work). Recheck bolt torque and belt tension after first few hours of operation.

Note: Procedures and torque specs vary by exact MF3600 model and engine option. Use the tractor’s service manual for model-specific disassembly order, torque values, and thread directions.
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