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Parts Manual Massey Ferguson TE-20 tractor download

1) Safety (short)
- Park on level ground, engine off, key removed, park brake on, wheels chocked. Wear gloves/eye protection.

2) Theory — how the TE‑20 clutch works and what the adjustment controls
- Components: flywheel (bolts to crank), friction (drive) disc splined to gearbox input shaft, pressure plate (clamps the disc to the flywheel), release (throw‑out) bearing and release/fork/lever actuated by the pedal through an adjustable pushrod/linkage.
- Function: when pedal is released, the pressure plate springs clamp the friction disc to the flywheel so power passes into the gearbox. Depressing the pedal moves the release bearing against the pressure‑plate release fingers, lifting the pressure plate off the disc and interrupting drive.
- What the adjustment sets: the free‑play (dead travel) in the pedal before the release bearing contacts the pressure plate. Proper free‑play leaves a small clearance at rest so the pressure plate is fully engaged and the release bearing is not preloaded.
- Symptoms and causes:
- Too much free‑play: the release bearing does not move far enough to fully disengage the pressure plate — clutch drags, gears crunch on engagement, forward/backwards creep.
- Too little free‑play (or preload): the release bearing constantly contacts the pressure plate — clutch slips, overheating, premature release bearing and pressure‑plate finger wear, hard shifting.
- Worn friction disc or uneven flywheel surface changes geometry and may make adjustment insufficient — then mechanical repair (disc replacement, flywheel resurfacing) is required.

3) Measured targets
- Typical pedal free‑play to aim for: about 20–40 mm (3/4"–1.5") of pedal movement at the top of the pedal before you feel resistance. (Use the factory manual for the exact TE‑20 spec; this range is the working target.)
- Release bearing clearance to pressure‑plate fingers when pedal is up: small clearance (a few millimetres) — set by the free‑play measurement above.

4) Quick inspection before adjusting
- Check linkage and pivot pins for wear/looseness, worn clevises, missing cotter pins — sloppy linkage will make adjustment ineffective.
- Inspect the clutch housing/bellhousing for oil leaks (gearbox or rear main seal) — oil on clutch faces causes slipping and cannot be fixed by adjustment alone.
- Replace or grease worn pivot bushes as required.

5) Step‑by‑step adjustment (order)
1. With engine off and wheels chocked, measure pedal free‑play (push the pedal up until resistance is felt and measure travel from top).
2. Locate the external clutch pushrod/adjuster and its locknut (on TE‑20 this is the long pushrod/turnbuckle between pedal and gearbox/clutch fork).
3. Loosen the locknut(s) on the adjuster.
4. Make a small change, then re‑measure:
- Lengthening the pushrod (turning adjuster to increase effective length) reduces pedal free‑play (bearing contacts sooner).
- Shortening the pushrod increases pedal free‑play.
- Make adjustments in small increments; you only need to move a few millimetres per step.
5. When pedal free‑play measures in the target range (≈20–40 mm), tighten the locknut(s) securely.
6. Re‑check free‑play after locking the nut to ensure it didn’t shift.
7. With the engine running (chocked, brake on) test the clutch:
- With engine at idle, select a low gear and try to move off gently to check for slipping.
- Raise engine speed slightly and engage gear to confirm the clutch fully disengages (no crunching).
8. If the clutch slips under load even with correct adjustment, or if you cannot obtain correct free‑play because adjuster is at its limit, proceed to internal inspection/repair.

6) When adjustment won’t fix it — what to check and why
- If you can’t stop slipping or you run out of adjuster travel:
- Friction disc worn beyond service limits: a thinner disc requires more pushrod travel to disengage. Replacement restores correct thickness so adjustment works.
- Pressure plate springs weakened: reduced clamp load causes slipping even when geometry is correct. Replace pressure plate assembly to restore clamp force.
- Flywheel face glazed, scored or warped: glazing reduces friction, scoring causes uneven engagement; resurfacing or replacing the flywheel restores a flat, grippy contact surface so the clutch can transmit torque properly.
- Release bearing or pivot wear: worn bearing or worn fork permits loss of movement or noisy operation; replace bearing and worn pivot parts.
- Contamination by oil: gearbox/rear main seal leak soaks the disc; cleaning won’t fix soaked linings — replace contaminated disc and repair seals.

7) How each repair fixes the fault — the mechanics
- Adjusting pushrod length corrects the idle clearance so the release bearing is free at rest and can travel the correct distance to fully lift the pressure plate. This stops dragging or preloading when correct.
- Replacing the friction disc restores the original stack thickness on the splined hub; that restores the geometry so that the same pushrod travel produces full disengagement and full engagement.
- Replacing/resurfacing the flywheel and pressure plate restores flat faces and spring force so contact is even, friction is effective, and heat is distributed properly — eliminating slip, chatter and hot spots.
- Replacing release bearing/fork/pivots removes excess play and friction which can cause incomplete disengagement or noisy operation.
- Fixing oil leaks prevents contamination; a clean friction surface allows the clutch to bite and hold torque as designed.

8) Final checks and run‑in
- After any internal replacement, set pedal free‑play again to spec.
- Test-drive under load, confirming no slip, no drag, smooth engagement.
- Re‑inspect after first few hours of operation and retorque linkage locknuts if needed.

9) Quick troubleshooting guide (concise)
- Dragging/clutch not disengaging: usually too much free‑play? (no — dragging is usually too little disengagement caused by too much free‑play or linkage misadjustment, or mechanical binding). Re‑measure, adjust, check linkage binding and worn splines.
- Slipping under load: usually too little clamp force (worn lining, weak springs, contaminated surfaces) — replace disc/pressure plate and/or resurface flywheel; fix leaks.
- Noisy/thumping when pedal pressed: worn release bearing or pivot — replace bearing and bushings.

That is the ordered procedure with the operating theory and why each fix remedies the symptom.
rteeqp73

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