Correct tyre pressure and regular wheel inspection improve traction, stability, tyre life and safety. Tractors and construction machines often work with heavy loads, uneven ground, loaders and implements, so tyres and wheel fixings should be checked as part of routine servicing.
Large agricultural and construction tyres store considerable energy. Never work on a damaged split rim, multi-piece rim or inflated tyre assembly unless you have the correct equipment and training. Use proper jacking points and axle stands when lifting a machine.
1. Check Tyre Pressure Cold
Pressure should normally be checked before the machine has worked hard or travelled far.
Use a reliable gauge and compare with the correct pressure for:
- Tyre size
- Axle load
- Road use
- Field use
- Loader operation
- Implement weight
One pressure does not suit every job.
2. Under-Inflation
Running too soft can cause:
- Excess sidewall flexing
- Heat build-up
- Bead damage
- Tyre movement on rim
- Heavy steering
- Poor road handling
- Rapid shoulder wear
3. Over-Inflation
Excess pressure can cause:
- Reduced footprint
- Poor traction
- Harsh ride
- Centre tread wear
- More soil compaction
- Reduced flotation
The correct tractor tyre pressure is often based on the actual axle load and working speed, not simply a fixed number printed in a general chart.
4. Loader Tractors
Front-loader work places high loads on the front axle and tyres.
Check
- Front tyre load rating
- Correct inflation pressure
- Sidewall condition
- Rim condition
- Wheel nuts
- Front axle loading
A pressure suitable for light field work may be too low for repeated loader work.
5. Inspect Tread Condition
Look for:
- Cuts
- Missing lugs
- Uneven wear
- Embedded stones or metal
- Cracking
- Separation
Uneven tread wear can point to incorrect pressure, alignment trouble, worn steering joints or axle problems.
6. Inspect Sidewalls
Sidewall damage can be more serious than tread damage.
Warning Signs
- Deep cuts
- Bulges
- Exposed cords
- Severe cracking
- Bead damage
A bulge usually indicates internal structural damage and should not be ignored.
7. Check for Fluid Ballast
Some tractor tyres contain liquid ballast.
This affects:
- Tyre pressure checking
- Machine weight
- Repair procedures
- Valve position
Tell the tyre repairer if liquid ballast is fitted.
8. Wheel Nuts and Bolts
Wheel fixings should be checked regularly, especially after a wheel has been removed.
Check For
- Loose nuts
- Rust movement marks
- Damaged studs
- Elongated holes
- Cracked wheel centres
Use the correct tightening sequence and torque.
Wheel fixings can be damaged by under-tightening or over-tightening. Use the model-specific specification and recheck after the required running period.
9. Re-Torque After Wheel Removal
After a wheel has been refitted, many manufacturers specify a wheel-nut recheck after a short period of operation.
This is especially important on:
- Tractors
- Loaders
- Telehandlers
- Machines with adjustable wheel centres
10. Adjustable Tractor Wheels
Many agricultural tractors have adjustable rims or centres for track width.
Inspect
- Centre-to-rim bolts
- Clamps
- Wedges
- Studs
- Correct wheel orientation
Loose adjustable-wheel hardware can damage both rim and centre.
11. Dual Wheels
Dual-wheel systems require additional checks.
- Both tyres correctly inflated
- Matching tyre sizes
- Clamps secure
- No debris trapped between tyres
- Correct spacing
Large pressure differences between paired tyres can cause one tyre to carry too much load.
12. Four-Wheel-Drive Tyre Matching
On mechanical four-wheel-drive tractors, correct rolling circumference front-to-rear is important.
Problems can result from:
- Wrong tyre size
- Incorrect tyre combination
- Very different tread wear
- Incorrect pressure
The correct front/rear lead relationship is model-specific.
13. Uneven Tyre Wear
Common patterns can provide clues.
| Wear pattern | Possible cause |
|---|---|
| Centre wear | Excess pressure. |
| Shoulder wear | Low pressure or overload. |
| One-sided wear | Alignment, steering or axle issue. |
| Scalloped / irregular wear | Loose steering parts, wheel imbalance or suspension issues where fitted. |
14. Valve Stems
Inspect valves for:
- Cracks
- Leaks
- Missing caps
- Damage from mud or crop debris
Valve caps help keep dirt out and provide a secondary seal.
15. Tubed Tyres
Older tractors often use inner tubes.
Repeated punctures or valve failures can be caused by:
- Rust inside rim
- Incorrect rim tape
- Tyre moving on rim
- Wrong tube size
16. Rim Condition
Check rims for:
- Rust
- Cracks
- Bent flanges
- Damaged bead seat
- Loose centres
Severe corrosion can make a rim unsafe even if the tyre itself looks good.
17. Safe Jacking
When removing a wheel:
- Park on firm, level ground.
- Apply parking brake.
- Chock opposite wheels.
- Use the correct jacking point.
- Support the machine with suitable stands.
- Do not rely on a hydraulic jack alone.
18. Heavy Wheels
Large tractor wheels can be extremely heavy, especially with ballast.
Use suitable lifting or wheel-handling equipment rather than trying to control a large wheel by hand.
19. Road Use
Before road travel check:
- Pressures
- Wheel nuts
- Tyre cuts or bulges
- Excessive tread damage
- Correct tyre condition for expected speed
20. Routine Tyre & Wheel Checklist
| Item | Check |
|---|---|
| Pressure | Correct for load and use. |
| Tread | No severe cuts or irregular wear. |
| Sidewalls | No bulges, exposed cords or deep cracks. |
| Valve stems | No leaks or damage. |
| Wheel nuts | Correct torque and secure. |
| Rims | No cracks, severe rust or damage. |
| Dual wheels | Matching pressure and clamps secure. |
| 4WD tyre match | Correct front/rear sizes and condition. |
Related Agrimanual Manuals
Tyre pressures, wheel-nut torque, track-width settings and permitted tyre combinations vary by model.
- Search Agrimanual for tyre and wheel service information
- Search Agrimanual operator manuals
- Request a manual if your machine is not listed
Frequently Asked Questions
What tyre pressure should I use on my tractor?
Use the tyre manufacturer’s load/pressure data and the tractor manual. The correct pressure depends on tyre size, axle load, speed and type of work.
Why do my front tyres wear unevenly?
Check pressure, toe/alignment, steering joints, axle pivots and whether loader work is overloading the front tyres.
How soon should wheel nuts be rechecked after fitting a wheel?
Follow the machine manual. Many machines require an early re-torque after a short period of operation.
Can I run different tyre sizes on a 4WD tractor?
Only approved front/rear combinations should be used. Incorrect rolling circumference can cause transmission wind-up and driveline wear.
Is a tyre with a sidewall bulge safe?
No. A bulge usually indicates internal structural damage and should be assessed or replaced before further use.
Correct pressure and secure wheels improve safety, traction and tyre life. Small checks can prevent expensive failures and dangerous wheel problems.