Reliability and versatility are 2 impressive features that have made the Bobcat 331 the best mini excavator model. But like other excavators, you will experience some problems using Bobcat 331.
The most common Bobcat 331 Problems are hydraulic issues, engine errors, and boom failure. Some users also experienced case drain failure and weak stick and swing.
Thankfully, some of the problems can be resolved at home. On the other hand, others need professional mechanics’ assistance.
Bobcat 331 Specification
Find the specification of Bobcat 331 from the chart below.
| Digging Depth (Max.) | 122.1 ft. |
| Maximum Reach Along Ground | 191.9 ft. |
| Maximum Vertical Wall Digging Depth | 7.3 ft. |
| Operating Weight | 7185 lbs. |
| Swing Speed | 9.2 RPM |
| Engine Net Power | 20 HP |
| Maximum Cutting Height (Long Arm) | 10.1 ft. |
| Maximum Digging Depth (Long Arm) | 134 ft. |
Bobcat 331 Problems, Solutions and Replacement Costs – (At a Glance)
Learn the problems, solutions, replacement costs of Bobcat 331 at a glance from the chart.
| Sl# | Common Problems | Solutions | Replacement Costs |
|---|---|---|---|
| 1 | Failure of the case drain | Replace the case drain filter | $20-$100 |
| 2 | Problem in the Final drive rotator | Change the final drive rotator | $380-$1,200 |
| 3 | Hydraulic leak | Seal the leak | $10 |
| 4 | Shut-off fuel solenoid fail | Replace the fuel shut-off solenoid | $20-$100 |
| 5 | Weak stick and swing | Adjust the pressure | $15 |
| 6 | Track problems | Retighten the tracks | $150 |
| 7 | Boom failure | Change the faulty part and top up the hydraulic fluid | $150 |
| 8 | Corroded terminals | Clean the battery terminal. Replace if required | $90 |
| 9 | Damaged alternator | Change the defective component | $350-$400 |
What are the Effective Solutions for Bobcat 331?
Calling a professional mechanic will be costlier for sure. Before heading to a mechanic shop, try yourself to solve the problem and save a few bucks. However, if you are still trying to resolve the issues independently, consider getting help from a skilled professional.
Try the fixations described below.
#01 – Final Drive Rotator Problem: Replace It
The final drive rotator is one of the critical parts of Bobcat 331. If this component malfunctions, your mini excavator will stop functioning.
The front section will be damaged, and you will smell gear oil. According to the manufacturer, the gear oil must be changed every 250 operating hours.
Find the steps on how to solve the issue.
- Step 01: Look for any damage in the front section by opening it. Also, the face seal must be opened to remove the rotator group.
- Step 02: Again, inspect for damage in the main seal. If you find any, repair the seal.
- Step 03: Now, you will have to diagnose the rotator to locate any damage. For this, unbolt it. In case you find any defective parts, replace it with a new one.
- Step 04: Replace the faulty valve block ring.
Professional help is a must for a severely damaged final drive rotator. Buying separate parts will cost you $380 – $1,200.
Important Note: High pressure of the hydraulic needs to be avoided. If required, replace the bearing.
#02 – Faulty Case Drain Filter: Replace it and Clean the Lines
The responsibility of the case drain filter is to filter different components in the hydraulics. You must clean the filter periodically, and replacement is necessary if it stops functioning.
These filters usually get blocked over time. For this reason, you must check them for blockage and clean them regularly. Otherwise, normal operation of the hydraulic will hamper as the pressure drops. Replacing the case drain filter will help you sort out the problem.
Here is how to replace the case drain filter.
- Step 01: Open the back cache to locate the case drain filter. Typically, it is positioned near the hydraulic lines and pumps.
- Step 02: Open the filter by unplugging it. I recommend replacing it with a new one if the working hour of your Bobcat 331 is more than 250. As cleaning is not the ultimate solution. If you clean it, the problem will arise after a few days.
- Step 03: Inspect the fluid lines pipe for blockage. It is suggested to be cleaned every 100 hours.
- Step 04: If the pipe is leaked or damaged, replacement is necessary. The connector requires unbolting. Once the line is replaced, reconnect the pipe.
The filter will cost roughly $21, and you must pay $50 for the fluid pipe. However, the price may vary based on the brand and quality.
#03 – Leaky Hydraulic: Fix the Leaks
Locating the source of the leak is needed to fix the problem. Bobcat 331’s hydraulic pump and oil lines are beneath the rear. So, if you lift the mini excavator using a jack stand, completing the job will be more manageable.
The below steps will let you solve the problem.
- Step 01: Use a jack stand or lifter to raise the excavator. It helps you work under it with less hassle. Next, wait for a few minutes to know where the oil leaks.
- Step 02: Then, grab a soft rag to clean the area where the oil drips. Next, moisture needs to be removed from the lines.
- Step 03: The oil lines and engine connect beneath the seat beside the hydraulic lines side. Now, loosen the bolts that connect the lines.
- Step 04: Get a wrench to tighten the bolts. Well-tightening will stop an oil leak.
After doing all this hard work, are you still experiencing leaks? Then buy an oil pump seal and install it in the center of the connector.
The price for oil pump seals is low. Also, they are available in your nearest hardware store, which will cost you at most $10.
Final Words
If you have basic automotive knowledge, try the above methods to solve Bobcat 331 problems. However, if you lack confidence, avoid touching any part, and you can make the situation unacceptable. The Bobcat 331 is complicated for its powerful engine and portable feature.
With so many problems, is Bobcat 331 reliable? In reality, Bobcat 331 is a touch, compact machine suitable for many tasks in demolition, landscaping, and trenching. You can work with it in tight spaces quickly and efficiently for its compact and lightweight design. When it comes to versatility and power, the Bobcat 331 is unbeatable.
However, stop panicking when a problem arises, as most problems related to Bobcat 331 are easy to handle at home. Keep up the manufacturer-recommended maintenance schedule to prevent complications.
Video References
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Meet Emily, a true garden lover who has a passion for all things nature. With a deep understanding of plants and lawns, Emily’s love for gardening started at a young age, spending her summers tending to her grandparents’ garden.