The Bobcat 331, 331E, and 334 Mini Excavators are popular choices in the compact excavator category, known for their robust construction and versatility in various construction and landscaping applications. These machines are equipped with sophisticated hydraulic systems and electrical components, including fuse boxes and relays, which are pivotal for their operation.
The fuse box in these excavators serves to protect electrical circuits from overloads, ensuring safety and preventing damage to components. Relays, on the other hand, act as switches that control high-current circuits, allowing precise operation of functions like hydraulic pumps, motors, and lights.
Regular inspection and maintenance of the fuse box and relays are crucial to ensure the excavators operate smoothly and efficiently on job sites. Issues with these electrical components can lead to downtime and hinder productivity. Therefore, operators and maintenance personnel often check and replace fuses as needed, and troubleshoot relay connections to maintain optimal performance of the Bobcat 331, 331E, and 334 Mini Excavators.
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Bobcat 331, 331E, and 334 Mini Excavator fuse box and relay with Diagram
WARNING
- Never replace a fuse with one that has a higher amperage rating.
- A fuse with a too-high amperage could damage the electrical part and cause a fire.
- On no account should fuses be repaired (e.g. patched up with tin foil or wire) as this may cause serious damage elsewhere in the electrical circuit or cause a fire.
- If a fuse blows repeatedly, do not keep replacing it. Instead, have the cause for the repeated short circuit or overload tracked and fixed.
- Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.
Bobcat 331, 331E, and 334 Mini Excavator fuse assignment
Fuse Block
| No. | Ampere | Description |
|---|---|---|
| 1 | 5A | Wiper |
| 2 | 20A | Switched Power |
| 3 | 25A | Alternator/Power Relay |
| 4 | 25A | Attach. Control Device |
| 5 | – | Not Used |
| 6 | 25A | Air Cond., Heater Fan |
| 7 | 5A | Ignition |
| 8 | 25A | Fuel Solenoid |
| 9 | 25A | Controller |
| 10 | 25A | Attach. Control Device |
| 11 | 20A | Lights |
| 12 | 15A | Accessory Plug |
| Relay | ||
| E | Switched Power | |
| F | Fuel Solenoid | |
| G | Lights | |
| H | Glow Plugs | |
| J | Starter | |
The excavator has a 12 volt, negative ground electrical system. The electrical system is protected by fuses located under the cover at the right side of the excavator (Item 1). The fuses will protect the electrical system when there is an electrical overload. The reason for the overload must be found before starting the engine again.