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Massey Ferguson MF135 MF150 MF165 tractor factory workshop and repair download manual

- Safety first (short and direct)
- Wear eye protection, gloves, steel-toe boots.
- Work on level ground, chock wheels, disconnect battery negative.
- Use quality jack stands and a transmission jack or equivalent support for the gearbox before removing any bolts; do not rely on a hydraulic jack alone.
- If you are unsure about lifting or supporting heavy loads, get help or a shop — this job involves heavy components and can kill or maim if the tractor shifts.

- Overview of what you’re doing (one-line)
- You will separate the gearbox from the engine, remove the clutch pressure plate and disc, inspect/replace wear parts, then reassemble with correct alignment and torque.

- Typical reasons parts must be replaced (what to look for)
- Clutch disc: replace if friction material is thin, glazed, contaminated with oil, or warped — causes slipping or chatter.
- Pressure plate: replace if springs are weak, broken, or surface is badly scored/warped — causes poor clamp force or noise.
- Release (throwout) bearing: replace if noisy, rough, or worn — always replace when clutch apart.
- Pilot/bush/spigot bearing (if fitted): replace if noisy or scored — supports input shaft; failure causes alignment/noise problems.
- Flywheel: resurface if glazed, hot-spotted, scored; replace if cracking or excessive runout.
- Seals (rear crank seal, gearbox input seal): replace if leaking to prevent oil contaminating new clutch.
- Misc: replace worn dowel pins, bolts that are stretched/damaged, and any rubber/insulation parts that are degraded.

- Required tools (detailed description + how to use each)
- Socket set (metric & imperial mix up to 32 mm): ratchet, extensions, universal joint.
- Use to remove nuts and bolts. Pick the correct size socket, apply breaker-bar for stuck bolts, keep sockets straight to avoid rounding heads.
- Combination spanner set: open-end and box-end wrenches same sizes as sockets.
- Use where a socket won’t fit or to hold the nut while turning the opposite side.
- Breaker bar (long handle): high leverage for seized fasteners.
- Use with care—avoid sudden shock; apply steady force to break loose bolts.
- Torque wrench (click type, suitable range 10–250 Nm or higher): for final tightening to spec.
- Set required torque, tighten until it clicks; tighten bolts in the specified sequence (pressure plate in a star pattern).
- Screwdrivers (flat & Phillips) and small picks: for clips and small covers.
- Use properly sized tips to avoid stripping heads.
- Pry bars / large flat screwdriver: to help separate gearbox from engine after bolts removed.
- Insert gently at seam, pry evenly—don’t lever against soft castings; use wood blocks to protect surfaces.
- Transmission jack or heavy floor jack with good timber cradle and strap: to support and lower gearbox safely.
- Center gearbox on cradle, strap it, lower slowly; get a helper for alignment if no shop jack.
- Clutch alignment tool (plastic or steel, correct diameter or slotted for spline): essential.
- Insert through clutch disc into pilot bore to center disc while tightening pressure plate bolts so the gearbox input shaft will slide in easily.
- Bearing puller / slide hammer (if needed for pilot bearing or release bearing removal): for removing stubborn bearings.
- Use correct size puller to avoid damage; pull straight and evenly.
- Impact driver (optional but helpful): to remove rusted screws/bolts quickly.
- Use with care—impact can break bolts; support parts when using.
- Hammer & soft mallet (brass or rubber): tapping components free without damaging faces.
- Use soft mallet on cast faces; use steel hammer only on hardened punches/drifts.
- Drift punches and pin punches: for removing dowel pins or retaining pins.
- Tap pins out straight, support part to prevent bending.
- Wire brush, brake cleaner or degreaser, rags: to clean mating surfaces.
- Clean oil/grime thoroughly before assembly.
- Seal puller / gasket scraper: to remove old seals and sealant without scoring.
- Remove old sealant cleanly; avoid gouging sealing surfaces.
- Dial indicator (optional): to check flywheel runout if suspect.
- Mount to engine and rotate crank to measure wobble; replace/resurface if runout exceeds spec.
- Calipers or micrometer (optional): to measure clutch disc thickness if you want to check wear.
- Compare to new part spec; replace if below minimum.

- Extra/optional tools and why they are helpful
- Service manual or workshop manual for MF135/150/165: gives bolt torque values, removal order, drawings. Required if you want correct torque and sequence.
- Transmission jack or engine hoist: makes gearbox removal safe and controllable. Highly recommended.
- Impact wrench: speeds removal but use with care.
- Flywheel turning bar / crank pulley holding tool: to lock crank when removing/torquing flywheel/pressure plate bolts.

- Preparatory steps (in order, short bullets)
- Park on level ground, chock wheels, disconnect battery negative.
- Remove any PTO implements and front weights.
- Drain gearbox oil into container and dispose appropriately (you’ll lower gearbox).
- Remove top covers, gear levers, linkage rods, clutch linkage and remove anything obstructing gearbox removal (PTO shaft, drive shafts, PTO cover).
- Support gearbox with transmission jack or floor jack and timber before removing bellhousing bolts.

- Main removal steps (clear, concise sequence in bullets)
- Remove rear wheels or open enough working space to access gearbox fasteners if clearance is an issue.
- Disconnect control linkages: clutch rod, gearshift linkages, handbrake cables, PTO rods; label or note locations.
- Remove driveshaft or propshaft (if applicable) and universal joint bolts; secure shaft out of the way.
- Remove bellhousing-to-engine bolts and any brackets securing the gearbox. Keep track of bolt lengths and locations.
- Support gearbox with jack, remove remaining bolts, gently pry gearbox away from engine using pry bars and wooden blocks to protect castings. Lower gearbox slowly on the jack.
- With gearbox out, remove pressure plate retaining bolts slowly and evenly (loosen in a star pattern, a few turns at a time) to avoid warping the pressure plate. Remove pressure plate and clutch disc.
- Inspect flywheel face for hot spots, scoring, or wear. Check crankshaft pilot bore for damage. Remove pilot bearing if required.

- Inspection and replacement decisions (what to measure/inspect)
- Clutch disc: measure thickness; friction material should be even and not glazed. Replace if worn, or if oil soaked.
- Pressure plate: look for cracks, broken springs, or scored/fractured friction surface. Replace if damaged or weak.
- Release bearing: spin by hand—should be smooth; replace if rough/noisy. Always replace with clutch job.
- Flywheel: if heat discolouration, deep scoring, or cracking, resurface or replace. Resurfacing possible if not beyond service limit; shop will confirm.
- Rear crank seal and gearbox input seal: replace if leaking or removed during disassembly to prevent contamination of new clutch.
- Replace all clutch cover bolts if damaged; use thread locker where specified by manual.

- Reassembly tips (critical actions)
- Clean mating surfaces: remove old gasket, oil and debris. Use solvent, make sure dry.
- Fit new pilot bearing (if replaced) using proper drift and even seating.
- Use clutch alignment tool through the disc into pilot bore to center the disc on the flywheel.
- Tighten pressure plate bolts finger-tight, then torque in a star or criss-cross pattern in stages to the manufacturer’s torque spec (use service manual value).
- Remove alignment tool and check that gearbox input shaft slides in smoothly without forcing. If it binds, realign clutch.
- Replace any seals you removed, clean and reinstall gearbox, supporting it with the jack and aligning dowels.
- Reinstall all linkages and check clutch pedal free play and adjustment per manual. Fill gearbox with the correct oil to the correct level.
- Test operation before full load: run tractor, check for slipping, chatter, leaks, smooth gear engagement.

- Typical replacement parts list (what to order)
- Clutch friction disc (correct spline count and diameter for MF135/150/165).
- Pressure plate (matching disc, complete clutch cover assembly).
- Release (throwout) bearing.
- Pilot bearing/bush (if fitted).
- Rear main crank oil seal and gearbox input seal (recommended).
- Dowel pins / bolts (if worn or damaged) and gasket or sealant for bellhousing.
- Flywheel (only if cracked or beyond resurfacing limits) or flywheel resurfacing service.
- Clutch fork or pivot ball (if worn or damaged).
- Clutch alignment tool (you can buy inexpensive plastic ones specific to tractor spline or use a new disc’s hub on a mandrel if you know how).

- Signs you must replace parts (short diagnostic cues)
- Slipping under load: clutch disc worn or contaminated.
- Noise when depressing pedal: release bearing.
- Clutch engagement is sudden or uneven: warped pressure plate or glazed disc.
- Oil on friction plate: leaking rear main seal or gearbox input seal—replace seals and disc.
- Excessive effort or sticking: linkage, worn pivot, or binding release mechanism—inspect and replace worn parts.

- Torque and alignment cautions
- Always torque pressure plate bolts to manufacturer spec and in star pattern. Do not guess torque—use a torque wrench.
- Use a clutch alignment tool for accurate centering—failure to align will prevent gearbox input shaft from engaging and can damage splines.

- Final checks after reassembly
- Check clutch pedal travel and free play; adjust to spec.
- Start tractor and test clutch engagement in neutral before driving.
- Drive slowly and test under light load; recheck bolts and oil level after first few hours of operation.

- Time and help note (practical)
- Expect a full-day job for a competent mechanically-inclined person; allow 1–2 days as a beginner. Have an assistant for heavy lifting and alignment.

- Last word (brief)
- Follow the MF service manual for torque values and specific drawings; replace clutch disc, pressure plate, and release bearing as a set. If any step feels beyond your toolset or confidence, have a professional finish the job.

(End — no questions.)
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