The Bobcat T770 is a powerful machine, but like any skid steer loader, it comes with its share of issues. After having used the T770 on several job sites, and talking to other operators, I’ve gathered some of the common problems that seem to crop up with this model. Whether you’re considering buying one or you already own it, here’s a breakdown of what you might encounter and how to tackle these issues head-on.
Common Bobcat T770 Problems
1. Hydraulic System Issues
One of the most reported issues with the Bobcat T770 is its hydraulic system. Since the T770 is designed to handle demanding attachments, any problems with the hydraulics can seriously impact performance.
- Symptoms: Slow or jerky movement of the boom, bucket, or other attachments, hydraulic overheating, or low hydraulic pressure warnings.
- Possible Causes: Low hydraulic fluid levels, clogged filters, or air in the hydraulic system.
Solution: Regularly check the hydraulic fluid levels and top up if necessary. Clean or replace hydraulic filters, and bleed the hydraulic system if air has been trapped. It’s also a good idea to monitor your hydraulic hoses for any wear or damage that could lead to leaks.
2. Electrical Issues
The T770’s electrical system can also be a source of frustration, especially after long hours of operation or when exposed to moisture and dirt on the job site.
- Symptoms: Intermittent starting issues, error codes popping up on the display, or random electrical faults with sensors and lights.
- Possible Causes: Loose wiring, corroded connectors, or malfunctioning sensors.
Solution: Inspect the electrical connections regularly and ensure they are tight and clean. A common issue is the wiring harness getting damaged, so look for any exposed wires or wear. Using a dielectric grease on connectors can also help protect against moisture and corrosion.
3. Track and Undercarriage Wear
The tracks and undercarriage on the T770 are built tough, but they can wear down faster depending on the terrain you’re operating on.
- Symptoms: Uneven wear on tracks, squeaking or grinding noises from the undercarriage, or a loss of traction.
- Possible Causes: Operating on sharp rocks, heavy debris, or improper track tension can accelerate wear.
Solution: Regularly clean out the undercarriage and inspect it for damage or debris. Make sure the tracks are properly tensioned—too loose and they’ll slip, too tight and you’ll wear them out prematurely. Replacing the tracks when you notice significant wear is also key to avoiding bigger undercarriage issues.
4. Cooling System Problems
Overheating can be a major issue, particularly when you’re pushing the T770 hard during the summer or in heavy-duty applications like mulching or earthmoving.
- Symptoms: Engine temperature warnings, reduced performance, or a complete shutdown to prevent damage.
- Possible Causes: Blocked radiators, low coolant levels, or faulty cooling fans.
Solution: Clean the radiator and cooling fans regularly to remove any dirt or debris that could block airflow. Ensure the coolant is at the right level and replace it according to the manufacturer’s schedule. If the cooling fan isn’t working properly, it might need a replacement.
5. DEF System and DPF Issues
Newer Bobcat models, including the T770, are equipped with a Diesel Exhaust Fluid (DEF) system and Diesel Particulate Filter (DPF) to meet emissions standards. While these systems help reduce environmental impact, they are also a common point of failure.
- Symptoms: DEF warnings on the display, reduced engine power (limp mode), or frequent DPF regeneration cycles.
- Possible Causes: Contaminated DEF, clogged DPF, or sensor malfunctions.
Solution: Always use high-quality DEF and store it properly to avoid contamination. Ensure the DPF is cleaned or regenerated as needed and follow Bobcat’s maintenance schedule closely. If you’re facing frequent issues, the sensors may need recalibration or replacement.
6. Lift Arm and Bucket Pin Wear
Another issue with heavy use is wear on the lift arms and bucket pins. Over time, the pins and bushings can wear out, leading to excessive play in the lift arm and bucket.
- Symptoms: Excessive movement in the lift arms, clunking noises during operation, or difficulty controlling the bucket.
- Possible Causes: Wear and tear from daily use, improper greasing, or using the machine beyond its load capacity.
Solution: Keep the pins and bushings well-greased and replace them once wear becomes noticeable. Regular greasing prevents excessive friction, which can dramatically extend the life of these components.
7. Fuel System Problems
Fuel delivery issues can also be a problem with the T770, particularly in cold weather or if the machine is used in dusty environments.
- Symptoms: Hard starting, loss of power, or engine stalling.
- Possible Causes: Clogged fuel filters, water in the fuel, or malfunctioning fuel injectors.
Solution: Replace fuel filters regularly and drain any water from the fuel separator. In colder climates, using a fuel additive to prevent gelling can also be helpful. If injectors are clogged, they may need to be cleaned or replaced.
Tips to Avoid These Common Issues
- Regular Maintenance: Keeping up with Bobcat’s recommended maintenance schedule is crucial. Things like hydraulic filter changes, fluid top-ups, and greasing should never be skipped.
- Monitor Warning Signs: Don’t ignore error codes or strange noises—these can be early warning signs of bigger issues down the road.
- Use Quality Fluids and Parts: Using substandard fluids or parts can lead to premature wear and tear. Always stick to Bobcat-approved materials.
- Keep It Clean: Dirt and debris buildup can wreak havoc on the cooling system, undercarriage, and hydraulic components. Clean your machine regularly, especially if you’re working in harsh environments.
Final Thoughts: Is the Bobcat T770 Worth It Despite the Issues?
Despite these common problems, the Bobcat T770 remains one of the most popular and reliable skid steers in its class. The performance, power, and versatility make it a favorite for heavy-duty applications like grading, mulching, and digging. Most of the issues mentioned above are preventable with regular maintenance and quick fixes, so as long as you’re diligent, you shouldn’t run into too many headaches.
If you already own a T770 or are thinking of buying one, understanding these common problems and how to address them will help you get the most out of your machine for years to come.