The Shenniu Tractor 4-25 is known for being strong and affordable, but like any machine, it has some common issues. If you’re using this model and facing problems, this guide will help you understand what’s wrong and how to fix it.
1. Hard Starting or No Start
If your Shenniu 4-25 won’t start or takes too long to start, there’s usually a problem with fuel, the battery, or the starter system.
Main causes:
- Weak battery or loose battery cables
- Clogged fuel lines or dirty fuel filter
- Cold weather making it hard for diesel to ignite
- Faulty glow plugs or starter motor
Fixes:
- Charge or replace the battery
- Clean fuel lines and replace the filter
- Use a block heater or keep the tractor in a warm place
- Check the starter and glow plugs, replace if faulty
2. Overheating Engine
This model sometimes runs hot, especially in summer or during long work hours. Overheating can cause engine damage if ignored.
Common causes:
- Low coolant or no coolant
- Dirty radiator or blocked airflow
- Damaged water pump
- Worn fan belt
Fixes:
- Top up or flush and refill coolant
- Clean the radiator fins and grill
- Inspect water pump for leaks or noise
- Replace or tighten fan belt
3. Weak Power Output
When the tractor struggles to pull loads or feels underpowered, the issue could be with the fuel or air systems.
Common causes:
- Dirty air filter restricting airflow
- Clogged fuel injectors
- Poor-quality diesel fuel
- Incorrect valve timing or compression issues
Fixes:
- Clean or replace the air filter
- Use injector cleaner or get a mechanic to clean injectors
- Drain and refill with clean diesel
- Check compression and adjust valve timing if needed
4. Gear Shifting Problems
If it’s hard to shift gears or the gears make grinding sounds, it could be a clutch or linkage issue.
Common causes:
- Worn clutch plate
- Low transmission oil
- Misaligned or dry gear linkage
Fixes:
- Replace or adjust the clutch plate
- Top up or change transmission oil
- Lubricate and align gear linkage
5. PTO Not Working Properly
The Power Take-Off (PTO) is key for using attachments. If it won’t spin or stops during use, that’s a serious issue.
Causes:
- PTO clutch not engaging
- Worn or broken PTO gears
- Loose linkage or lever problem
Fixes:
- Adjust or replace the PTO clutch
- Inspect gears inside the PTO housing
- Tighten and lubricate PTO lever and linkages
6. Hydraulic System Failure
If the lifting arms or attachments don’t work, it’s likely a hydraulic issue. This slows down field work and needs fast attention.
Causes:
- Low hydraulic oil
- Air bubbles in the system
- Worn hydraulic pump
Fixes:
- Refill hydraulic oil and remove air by bleeding the system
- Check all hoses and seals for leaks
- Replace or repair hydraulic pump if it’s noisy or weak
7. Brake Problems
Poor braking or spongy brakes make your tractor unsafe. This is usually a mechanical issue that’s easy to fix with the right parts.
Common causes:
- Worn brake pads or shoes
- Oil or grease on brake parts
- Loose or stretched brake cables
Fixes:
- Replace worn-out brake parts
- Clean off oil from brake drums or pads
- Adjust or replace brake cables
8. Electrical System Issues
If your dashboard is dead or lights don’t work, it’s likely an electrical problem. These are common in older Shenniu tractors.
Causes:
- Corroded battery terminals
- Blown fuse or faulty wiring
- Weak alternator or voltage regulator
Fixes:
- Clean battery terminals and tighten cables
- Replace blown fuses and check for loose wires
- Test and replace alternator if battery drains too fast
Keep Your Shenniu 4-25 in Top Shape
Most problems can be prevented with regular care. Follow these simple tips:
- Check fluids weekly (engine oil, coolant, hydraulic, fuel)
- Keep filters clean
- Listen for new noises or changes in performance
- Service the tractor every season
Want more simple tips to take care of your tractor? Click here to read more easy-to-follow guides that’ll help you keep your tractor working like new.
Conclusion
The Shenniu 4-25 is a dependable tractor, but like any machine, it can face issues over time. Whether it’s engine problems, hydraulics, or power loss, now you know what to look for and how to fix it.
Take action today—don’t wait until a small issue becomes a big repair. And if you want more useful tips and how-to articles, explore our full tractor guide library here.