Below is a practical, step‑by‑step guide for diagnosing and repairing the transmission on Massey‑Ferguson MF255/MF265/MF270/MF275/MF290 tractors. This is a general, shop‑level procedure — consult the official Massey‑Ferguson service manual for model‑specific drawings, part numbers and exact torque/endplay specifications before you begin.

Safety first
- Work on a level surface, chock wheels, and block tractor so it cannot roll.
- Disconnect battery negative lead.
- Use transmission jack or engine hoist for heavy components. Never rely on a floor jack alone.
- Wear safety glasses, gloves, steel‑toe boots.
- Support removed assemblies with stands/chains, and tag all linkages and wiring.
- Drain fluids into suitable containers and dispose of used oil/grease per regulations.

Required tools and how they are used
- Metric/SAE socket set and ratchets — remove bolts and covers.
- Torque wrench — tighten bolts to specified torques (refer to manual).
- Breaker bar, extensions, impact gun (with care) — for stubborn fasteners.
- Transmission jack or engine hoist/chain hoist — support and lower transmission.
- Floor jack and stands — support tractor, engine, housings.
- Bearing puller/gear puller and bearing separator — extract gears and bearings safely.
- Hydraulic press or arbor press — press bearings and gears on/off shafts without damage.
- Snap‑ring pliers — remove/install circlips.
- Seal driver set or appropriate socket — install oil seals squarely.
- Dial indicator with magnetic base — measure gear backlash, shaft endplay.
- Micrometer and calipers — measure shaft diameters, journal wear.
- Feeler gauges — check clearances and shim thickness.
- Pry bars, drift punches, soft mallet (bronze/nylon) — for gentle persuasion of parts.
- Gasket scraper, cleaning brushes, solvent/parts washer — clean mating surfaces.
- Thread locker (medium strength), anti‑seize, assembly lube — for reassembly.
- Shop rags, container for parts, labeling materials — keep parts and fasteners organized.
- New transmission oil (spec per manual), new gaskets, seals, bearings, shims, replacement gears or selector forks if worn.

Common replacement parts frequently required
- Mainshaft/layshaft bearings (roller/tapered).
- Thrust washers, spacers and shims.
- Oil seals and gaskets (top cover, inspection covers).
- Selector forks, rods, and detents if bent or worn.
- Gears or synchromesh dogs (if damaged).
- Clutch disc, pressure plate, throwout bearing, pilot bushing (if clutch removal required).
- Speedometer drive seal or gear (if applicable).

Step-by-step procedure

1) Preparation and access
- Park, chock, disconnect battery.
- Raise tractor and support on stands if needed; remove wheels or fenders as required for access.
- Remove hood, seat, and any controls that block access to the top cover and shift linkages. Label linkages.

2) Drain fluids and make ready
- Drain gearbox oil into a clean container (note color/metal chips).
- Remove PTO shaft and drive shafts or disconnect PTO drive as needed.
- Remove hydraulic lines that hamper transmission removal; cap lines to prevent contamination.

3) Remove external controls and linkage
- Disconnect gear shift levers, range selectors, linkage rods, and speed selector.
- Remove selector-shaft link pins and detent springs; tag orientation for reassembly.

4) Remove clutch housing/top cover and inspection covers
- If necessary, remove engine‑to‑transmission bolts to allow separation or slide transmission rearward from the engine. Use transmission jack and helper or hoist.
- For internal repairs you will usually remove the gearbox top cover or main housing cover first. Remove bolts systematically, noting their locations.
- Keep small parts organized and photographed/marked.

5) Disassemble gearbox internals
- Remove selector forks and shift rails; mark each fork and rail with its position.
- Remove circlips retaining shafts, then slide out shafts (mainshaft/layshaft) carefully. Use puller/press as required.
- Extract gears and bearings using bearing puller/separator and press; do not hammer directly on gears — damage will occur.
- Keep order of parts and note orientation. Photograph each stage.

6) Inspect components
- Inspect gears for broken teeth, chipped dog teeth, scoring, and excessive wear.
- Check bearing rollers and races for pitting, discoloration, or brinelling.
- Measure shaft journals with micrometer for wear and compare to manual limits.
- Check selector forks for wear at contact points and bent forks.
- Inspect thrust washers and shims for wear and correct thickness.
- Inspect synchronizer (if present) dogs, splines and hub for wear.

7) Decide repair vs replace
- Replace any bearings showing damage, seals, worn gears, or broken forks.
- Minor wear may be corrected with replacement shims/thrust washers; major journal wear or gear damage requires replacement shafts/gears.

8) Remove and replace bearings/seals
- Use press or bearing heater to install new bearings squarely; never strike with steel hammer.
- Install new seals with seal driver until flush; ensure lip faces correct direction.
- Clean all bores and mating surfaces before installation.

9) Reassembly with correct geometry
- Install layshaft and mainshaft in reverse order. Use assembly lube on bearings and splines.
- Replace all gaskets and O‑rings.
- Set shaft endplay (axial clearance) with shims or thrust washers per manual: measure with dial indicator and adjust shims until endplay is within spec.
- Check gear backlash: mount gearset and measure backlash with dial indicator; adjust shims if required to achieve correct backlash.
- Reinstall selector forks and rails in original positions; ensure smooth movement and correct indexing of detent mechanism.

10) Clutch mating/installation
- If clutch was removed, check pressure plate, disc, and flywheel for wear; resurface or replace if needed.
- Use alignment tool to center clutch disc when bolting pressure plate.
- Torque pressure plate bolts in crisscross pattern to specified torque.

11) Refit transmission to tractor
- Use transmission jack to raise transmission into position; align dowels and bolt holes.
- Start engine‑to‑transmission bolts by hand, then torque to specification.
- Reconnect PTO shafts, drive shafts, linkages, hydraulics, and wiring.

12) Fill and test
- Refill gearbox with correct grade and quantity of oil per manual.
- Reconnect battery.
- With tractor on stands and wheels chocked, run engine and cycle through all gears, ranges, and PTO engagement.
- Check for leaks, unusual noises, or binding.
- Road/test under load at slow speed and recheck oil level and leaks.

Common pitfalls and how to avoid them
- Not labeling parts/positions: Always mark forks, rails, and shims. A single misplaced shim changes endplay and gear mesh.
- Losing or mixing shims/thrust washers: Keep in sequence and measure reinstalled values; record shim thicknesses.
- Forcing bearings/gears: Use press or heat. Hitting bearings with hammer damages rollers and races.
- Incorrect endplay or backlash: Measure with dial indicator; improper values lead to noisy gearbox or rapid wear.
- Reusing seals/gaskets: Replace all seals and gaskets. Reused seals leak.
- Not replacing worn selector forks/dog teeth: Worn dogs cause missed engagement and gearbox damage.
- Contaminated parts: Clean parts thoroughly; keep any debris out of gearbox.
- Under‑torqued or over‑torqued fasteners: Use torque wrench to spec; over‑torque can strip threads or warp covers.
- Not checking clutch condition when removing transmission: Weak or glazed clutch causes perceived transmission issues after reinstallation.

Final checks
- Verify all bolts and fasteners torqued to spec.
- Verify shift action is positive and detents engage.
- Reinspect for leaks after the first hours of operation.
- Recheck oil level hot and cold per manufacturer instructions.

Notes and references
- This is a general guide. Use the Massey‑Ferguson workshop/service manual for the MF255/MF265/MF270/MF275/MF290 for exact torque values, shim sizes, and exploded parts diagrams.
- If you lack a press or transmission jack, consider professional shop help for bearing and heavy component work.

Done.
rteeqp73

20190923 Tractor Massey Ferguson 255 Mira las fotos en https://www.maquinariaagricolaindustrial.blogspot.com y escribe a armandortega@yahoo.com.

Massey Ferguson 255 - Overview This is my Massey 255, I have decided to part with it even though I love this machine. I grew up with Massey Ferguson tractors and ...

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