The Ferguson TE20 family is one of the most important small tractor designs ever produced. Compact, simple and highly effective, the TE20 and its later variants helped establish the Ferguson hydraulic three-point linkage system as a standard feature of modern tractor design.
This guide covers the main Coventry-built Ferguson TE20 family, including TE20, TEA20, TED20 and TEF20. Engines, fuel systems, electrical equipment and some chassis details differ between versions, so exact identification is important before ordering parts or using service specifications.
1. Why the Ferguson TE20 Matters
The TE20 combined a lightweight tractor with Ferguson’s three-point linkage and draft-control system.
Its influence can still be seen in tractors today.
2. The Main TE20 Family
The most commonly encountered Coventry-built versions include:
- TE20
- TEA20
- TED20
- TEF20
Although they look similar, the engines and fuel systems are not the same.
3. Ferguson TE20
The earliest TE20 tractors used a Continental petrol engine.
These tractors are especially important historically but should not be confused mechanically with the later Standard-engined TEA20.
4. Ferguson TEA20
The TEA20 used a Standard Motor Company petrol engine and became one of the best-known versions of the family.
It is commonly encountered in restoration work throughout Britain and many export markets.
5. Ferguson TED20
The TED20 was designed to operate on tractor vaporising oil after starting and warming on petrol.
Its fuel system and operating procedure differ from the ordinary petrol TEA20.
6. Ferguson TEF20
The TEF20 was the diesel member of the family and used the Standard diesel engine.
It has important differences in:
- Fuel system
- Starting system
- Electrical equipment
- Engine service procedures
7. Do Not Identify a TE20 Only by Paint or Decals
Many tractors have been repainted, rebuilt or fitted with replacement components.
Use:
- Serial plate
- Engine identification
- Fuel-system type
- Major component details
A TE20, TEA20, TED20 and TEF20 may look very similar externally but can require different engine, ignition, fuel and service parts.
8. Petrol Engine Starting Checks
For petrol versions, check:
- Battery condition
- Starter speed
- Spark quality
- Ignition timing
- Fuel supply
- Carburettor condition
- Compression
9. Ignition System
Petrol versions may use:
- Distributor
- Contact breaker points
- Condenser
- Ignition coil
- Spark plugs
After decades of repairs, many have non-original electrical components.
10. Ignition Timing
Incorrect ignition timing can cause:
- Hard starting
- Poor power
- Backfiring
- Overheating
- Kick-back during starting
Use the exact engine timing data rather than adjusting only by sound.
11. Carburettor Problems
Common causes of poor running include:
- Blocked jets
- Stale fuel
- Float-valve leakage
- Air leaks
- Incorrect mixture adjustment
12. TED20 Dual-Fuel Operation
The TED20 should be treated as a distinct fuel-system version.
Typical concerns include:
- Correct starting fuel
- Fuel-changeover system
- Correct operating temperature
- Carburettor condition
13. TEF20 Diesel Fuel System
The diesel version uses a mechanically governed injection system.
Check:
- Clean fuel supply
- Fuel filters
- Air in fuel system
- Injection timing
- Injector condition
- Cold-start equipment
14. TEF20 Cold Starting
Diesel versions require good:
- Battery condition
- Starter performance
- Compression
- Fuel delivery
- Cold-start system operation
Repeated starting-fluid use should not be treated as a substitute for diagnosis.
15. Engine Oil Pressure
Low hot oil pressure may indicate:
- Oil pump wear
- Bearing wear
- Incorrect oil
- Relief-valve problems
Confirm actual pressure using the correct test data.
16. Cooling System
Inspect:
- Radiator core
- Water pump
- Fan belt
- Thermostat where fitted
- Hoses
- Coolant condition
Old tractors often suffer from internal scale as well as external radiator blockage.
17. Four-Speed Gearbox
The TE20 family is known for a simple manual transmission.
Common age-related faults include:
- Bearing noise
- Jumping out of gear
- Worn selectors
- Water contamination in oil
18. Clutch
Common complaints include:
- Clutch stuck after storage
- Slipping
- Dragging
- Release-bearing noise
19. Stuck Clutch After Storage
A clutch plate can rust to the flywheel or pressure plate after long storage.
Use a safe approved freeing method before deciding to split the tractor.
Avoid uncontrolled towing, starting in gear or working near moving machinery. If the clutch cannot be released safely, split the tractor and inspect it properly.
20. Ferguson Three-Point Linkage
The hydraulic linkage is one of the defining features of the tractor.
The system uses draft sensing to help maintain implement load automatically.
21. Draft Control
Draft control responds to load through the top-link sensing system.
Common faults include:
- Linkage hunting
- Failure to lift
- Failure to lower
- Poor depth control
- Incorrect internal adjustment
22. Hydraulic Pump
The hydraulic pump is located within the rear transmission/hydraulic housing.
Possible problems include:
- Wear
- Sticking valves
- Contamination
- Internal leakage
23. Linkage Will Not Lift
Before dismantling, check:
- Oil level
- Control operation
- PTO/pump drive condition
- Internal oil leakage
- Pump output
24. Linkage Raises but Drops Quickly
Possible causes include:
- Lift-cylinder leakage
- Piston/ring wear
- Control-valve leakage
25. PTO
The PTO on these tractors is closely related to the transmission and hydraulic-pump arrangement.
Before PTO work, identify:
- Exact tractor version
- PTO shaft arrangement
- Hydraulic-pump drive relationship
26. PTO Safety
These tractors were built before many modern guarding standards.
Ensure:
- PTO guards are fitted
- Implement guards are sound
- Operator keeps clear of rotating shafts
27. Steering System
Most examples use straightforward mechanical steering.
Common wear areas include:
- Steering box
- Drag links
- Track rods
- Kingpins
- Front axle pivot
28. Front Axle Pivot Wear
Wear may cause:
- Visible axle movement
- Poor steering
- Uneven tyre wear
Loader use can accelerate front-end wear.
29. Brakes
Brake condition should be assessed carefully on any unrestored tractor.
Check:
- Both sides operate evenly
- Linkages move freely
- No oil contamination
- Pedal travel is reasonable
30. Electrical Polarity and Conversions
Many TE20-family tractors have been altered over the years.
Possible changes include:
- Dynamo-to-alternator conversion
- Polarity change
- 12-volt conversion
- Non-original starter switches
Identify the existing system before rewiring.
31. Common Long-Storage Problems
- Stuck clutch
- Water in transmission oil
- Seized brakes
- Corroded fuel tank
- Blocked carburettor or injectors
- Dry or seized control linkages
- Perished tyres and hoses
32. Water in Transmission/Hydraulic Oil
Milky oil is common on neglected tractors.
Water can enter through:
- Gear lever boots
- Condensation
- Damaged seals
- Outdoor storage
Contaminated oil can affect hydraulics and accelerate corrosion.
33. Before First Start After Restoration
- Confirm engine turns freely.
- Check oil and coolant.
- Clean fuel system.
- Check ignition or diesel fuel system as applicable.
- Inspect air intake.
- Check gearbox/hydraulic oil.
- Check brakes and steering.
- Confirm throttle and stop controls work.
34. Buying a Ferguson TE20 Family Tractor
Check:
- Correct model identity
- Cold starting
- Oil pressure
- Gearbox noise
- Clutch operation
- Hydraulic lift performance
- PTO operation
- Steering play
- Brake balance
- Previous electrical conversions
35. Restoration Priorities
A sensible restoration order is:
- Identify the tractor correctly.
- Make engine and fuel system reliable.
- Repair brakes and steering.
- Repair clutch, gearbox and hydraulics.
- Tidy wiring and charging system.
- Only then concentrate on paint and appearance.
36. Workshop Checklist
| System | Check |
|---|---|
| Identification | TE20, TEA20, TED20 or TEF20 confirmed. |
| Engine | Correct fuel/ignition system and good oil pressure. |
| Cooling | Radiator, pump, belt and hoses sound. |
| Clutch | No slip, drag or seizure. |
| Gearbox | All gears select correctly; oil not contaminated. |
| Hydraulics | Linkage raises, controls and holds properly. |
| PTO | Operates correctly and safely guarded. |
| Steering/brakes | No unsafe play; both brakes effective. |
| Electrics | Actual polarity/charging system identified. |
Related Agrimanual Manuals
- Search Agrimanual Ferguson TE20 manuals
- Search Agrimanual Ferguson TEA20 manuals
- Search Agrimanual Ferguson TEF20 diesel manuals
- Request a Ferguson manual if the exact version is not listed
Frequently Asked Questions
Are TE20 and TEA20 engines the same?
No. The early TE20 used a Continental petrol engine, while the TEA20 used a Standard Motor Company petrol engine.
What is the main difference between TEA20 and TED20?
The TED20 was arranged for tractor vaporising oil operation after starting and warming on petrol, so its fuel-system specification differs from the petrol TEA20.
Is the TEF20 just a diesel TEA20?
It belongs to the same tractor family but the diesel engine, fuel system, starting equipment and several service procedures are different.
Why does the hydraulic linkage stop working when the PTO is not driving?
On these tractors the hydraulic-pump drive is closely associated with the PTO/transmission arrangement. Use the correct manual to understand the exact operating relationship.
Why is the transmission oil milky?
Water contamination is common on tractors stored outdoors, particularly through damaged boots, seals and condensation.
The Ferguson TE20 family remains one of the most rewarding classic tractors to restore. Its simplicity is a strength, but identifying the exact engine and fuel-system version is essential before serious mechanical work.