Introduction
This guide is intended for Bobcat equipment owners, operators, and mechanics seeking information on alternator part numbers, fitment, maintenance, and troubleshooting. Whether you’re maintaining a fleet of skid steers, operating a compact track loader, or servicing mini excavators, understanding your Bobcat alternator is essential for reliable machine performance. This comprehensive resource covers everything from OEM and aftermarket part numbers to fitment checks, maintenance tips, and troubleshooting common alternator issues.
Key Takeaways
- The Bobcat alternator works with the battery to generate power for the electrical system, including lights, controls, and sensors on skid steer loaders, compact track loaders, and mini excavators.
- OEM part number 6678205 is a common genuine Bobcat alternator that cross-references with 6675292 and 6681857, and can be replaced by quality aftermarket units like valeo TA000A48401.
- Correct fitment depends on your machine model and 9-digit serial number—always verify before you order to avoid mounting or charging problems.
- High-quality aftermarket alternators often deliver 85–90 amps, matching or exceeding OEM performance, and typically include a 1-year warranty with free shipping options.
- Regular maintenance like belt inspection and terminal cleaning can extend alternator life to 2,000+ hours and prevent unexpected downtime.
What a Bobcat Alternator Does
What Is an Alternator and How Does It Work?
A Bobcat alternator is a premium electrical component designed to work with the battery to generate power for the electrical components of the machinery. It transforms mechanical rotation into electrical energy using a drive belt connected to the engine's crankshaft. As the engine runs, the alternator converts this mechanical energy into alternating current (AC) electricity, which is then converted to direct current (DC) to keep the 12-volt system operating and all electrical components functioning.
Alternator and Battery Partnership
The alternator on your Bobcat machine is responsible for converting engine power into electricity. When the engine runs, the alternator spins and produces electrical current that charges the battery and keeps all your electrical components working. This includes headlights, work lights, instrument gauges, hydraulic controls, and any telematics or sensors built into newer models.
Think of the alternator and battery as partners. The battery helps start the machine and provides backup power for the electrical system. Once the engine is running, the alternator takes over. It supplies power for the electrical needs and tops off the battery at the same time. A healthy charging system maintains voltage between 13.8 and 14.4 volts while operating.
Symptoms of Alternator Failure
When an alternator starts to fail, you might notice:
- Dim lights
- A battery that keeps dying
- Warning lights on the dash
- A machine that cranks slowly or refuses to start
These symptoms often get worse over time. On a busy job site, a dead S650 skid steer, T190 compact loader, or T590 compact track loader can halt an entire crew and cost you hours of productivity.
Common Bobcat Alternator Part Numbers (6678205, 6675292, 6681857)
Understanding Bobcat alternator part numbers can save you time and frustration when ordering a replacement. Several OEM numbers cover similar or overlapping model ranges, and knowing how they relate helps you find the right fit.
Part number 6678205 is a genuine Bobcat alternator used on a wide range of loaders and telehandlers. This 85-amp alternator replaced older part number 7015581 and fits models spanning multiple production years. You will find it listed for skid steers like the S510, S530, S550, S570, S590, S630, S650, S750, S770, S850, and many compact track loaders including the T450 through T870 compact track loader series.
Part numbers 6675292 and 6681857 are additional Bobcat alternator options that may cross-reference to the same aftermarket unit. Depending on the production date and plant, your machine’s service manual might call for one of these instead. All three numbers often point to compatible 85-amp alternator assemblies with internal regulators.
Popular aftermarket cross numbers include Valeo TA000A48401 and DB Electrical 400-40047. These direct replacements match OEM specs and offer competitive pricing. Before purchasing any product, confirm at least one of these factors:
- The OEM part number matches your original alternator
- The amp alternator rating is correct (typically 85 or 90 amps)
- The pulley configuration and mounting style fit your machine
Fitment and Compatibility Check
Fitment is critical because Bobcat machines built in different years—or even different plants—can require different alternators. A part that works perfectly on one S650 might not fit another S650 from a different serial number range.
To check model compatibility, start with your machine’s full 9-digit serial number and exact model name. For example, a T650 compact track loader with serial number AV9V11001 may use a different alternator than an earlier T650. The same applies to the S770 skid steer, TL38.70 telehandler, or any other Bobcat equipment.
Use an online parts catalog or serial number parts finder tool to discover the correct alternator for your machine. These tools let you enter your serial number and model, then display the exact item that fits. Many suppliers keep this information updated to reflect mid-production changes.
Here are a few things to keep in mind:
- Parts may change mid-production, so two machines of the same model from different years might not share the same alternator
- Always double-check the serial number range listed in the part description
- If you cannot read the label on your old alternator, compare mounting style, pulley type, and electrical connections
Incorrect fitment can cause belt misalignment, mounting issues, or charging problems. These issues shorten the life of both the alternator and battery, leading to repeat failures and costly repairs.
Genuine vs Aftermarket Bobcat Alternators
When your alternator fails, you have two main choices: order a genuine Bobcat replacement or install a quality aftermarket unit. Both options have their place depending on your budget, availability, and priorities.
Genuine Bobcat alternators like OEM 6678205 are built to exact factory specifications. They are tested for Bobcat machines and usually sold through authorized dealers. If your equipment is under warranty or you prefer the peace of mind that comes with the Bobcat logo on the box, OEM parts are the safe choice. However, they often come at a premium price and may require waiting if the dealer does not have stock.
Quality aftermarket alternators from brands like DB Electrical or Valeo offer several benefits. Many are 100% new—not remanufactured—and are built to meet or exceed OEM performance. They typically feature competitive pricing, strict quality control, and 1-year warranty coverage. Some suppliers also offer free shipping on orders placed over a certain value, along with same-day shipping if you order before the warehouse cutoff time.
Consider this scenario: your 2017 S590 skid steer needs a new alternator. The genuine 6678205 might cost $400 or more through a dealer and could take several business days to arrive. A compatible aftermarket 85-amp or 90-amp alternator might run $200–$300, ship the same day, and include a warranty. For many fleet managers and contractors, the cost savings and fast turnaround make aftermarket parts a smart choice, especially on high-demand machines like the Bobcat T595 compact track loader.
Ordering, Shipping, and Returns
Alternators are heavy electrical parts, and shipping time matters when your machine is down. Whether you run a rental fleet or handle your own equipment, getting the right part fast keeps you productive.
Most online suppliers let you search by OEM part number (6678205, 6675292, 6681857) or by machine model and serial number. Look for real-time stock status so you know immediately if the item is available or if you will be waiting for it to come back in stock. Clear pricing and a simple way to add the alternator to your cart make ordering straightforward.
Shipping Options
|
Shipping Type |
Typical Timeframe |
Notes |
|
Free Ground |
5–7 business days |
Often available on orders over $99 |
|
Expedited |
1–2 business days |
Extra cost, ideal for urgent repairs |
|
Same-Day |
Ships same day |
Orders placed before cutoff (e.g., 3 PM EST) |
Return Policy
A typical return policy for alternators includes:
- A 30-day return window
- The need to keep the original packaging
- The part must show no signs of installation damage
- Refund processing takes about 3–5 business days once the supplier receives the return
- Before starting a return, keep your invoice and make sure the alternator has not been modified or opened
Safety, Regulations, and Warranty
Alternators are electrical components installed close to the engine, so handle them with care. Always disconnect the battery ground cable before you work on the charging system. This protects you from shocks and prevents damage to the alternator or other parts.
Some engine-related parts can expose users to chemicals including those found in exhaust, oils, and combustion by-products. California Proposition 65 requires warnings about these exposures. You can find more information at P65Warnings.ca.gov. These warnings apply to many mechanical and electrical parts used on heavy equipment.
Product specifications like amp rating and dimensions are based on engineering data but may vary slightly due to manufacturing tolerances. Always compare the new alternator to your old one before installation.
A typical 1-year warranty covers defects in materials or workmanship. It usually does not cover:
- Improper installation
- Modified wiring or connections
- Physical damage from drops or impacts
- Use on machines not listed in the compatibility chart
To protect your warranty, follow manufacturer instructions carefully or have a qualified mechanic perform the installation. Keep your invoice and registration information in case you need to file a claim.
How to Tell If Your Bobcat Alternator Is Failing
Catching alternator problems early can save you from being stranded on a job site. Knowing the warning signs helps you schedule repairs before complete failure.
Common symptoms include:
- Battery warning light on the display panel
- Slow cranking when starting the engine
- Repeated dead battery despite recent charging
- Dim headlights or work lights
- Flickering cab displays or gauges
- Unusual whining or squealing sounds from the belt area
A simple voltage check can confirm whether your alternator is working. With the engine running, use a multimeter to measure voltage at the alternator charge post or battery terminals. A healthy system should read between 13.5 and 14.5 volts. Low readings may indicate alternator trouble or wiring issues.
Before replacing the alternator, inspect worn belts, corroded ground wires, and loose connections. These problems can mimic alternator failure and are cheaper to fix. If belts are glazed or cracked, replace them. If battery terminals are corroded, clean them and check cable condition.
For machines used daily on construction, landscaping, or agriculture jobs, schedule maintenance—such as regular Bobcat cooling system drain and flush service—before you experience complete failure. Downtime is expensive, and a proactive approach keeps your equipment running.
Maintenance Tips for Longer Alternator Life
Basic maintenance can significantly extend the life of your Bobcat alternator, reducing downtime and repair costs. Most alternators can last 1,500 to 2,000 hours or more with proper care, especially when installed on well-maintained loaders such as the Bobcat S205 skid-steer.
Belt Inspection
Start with regular belt inspection. Check the serpentine or V-belt for cracks, glazing, or slack every 500 hours. A slipping belt reduces charging efficiency at idle and puts extra strain on the alternator. Adjust tension according to your service manual or replace worn belts.
Terminal Cleaning
Clean battery terminals and inspect the main charge and ground cables at least once or twice a year. Corrosion builds up over time and creates resistance that reduces charging performance. Use a wire brush and terminal cleaner to keep connections tight and clean.
Electrical Load Management
Avoid long periods of idling with heavy electrical loads, particularly on older skid steers like the Bobcat 743 loader. Running full work lights, cab heaters, and powered attachments on an older or lower-amp alternator can drain the battery faster than the alternator can recharge it. If your work demands high electrical output on machines such as the Bobcat 753 skid-steer loader, consider upgrading to a 90-amp alternator.
High-output alternators may require upgraded charge and ground wiring to handle increased current safely, particularly on mid-size loaders such as the Bobcat 7753 skid-steer. Check cable gauge and connector ratings before installation. Undersized wiring can overheat and create fire risks, especially on powerful loaders like the Bobcat 863 compact loader.
FAQ
Q1: How can I be sure I'm ordering the right alternator for my Bobcat?
A1: The safest method is to use your machine’s 9-digit serial number together with the exact model (for example, S650, T770, or V519 telehandler) in an online parts catalog or compatibility checker. Matching the OEM part number on your old alternator—such as 6678205, 6675292, or 6681857—to the new part listing is the most reliable way to confirm fit. If the old label is unreadable, compare mounting style, pulley type, and electrical connections, or contact customer support with your serial number details.
Q2: Can a higher-amp alternator damage my Bobcat's electrical system?
A2: A properly designed high-output alternator does not push extra power into your system. It simply allows more current to be drawn when needed. The main risk comes from undersized charge and ground cables, which can overheat when carrying higher current. Upgrade wiring to manufacturer guidelines when installing high-amp units and check fuses and connectors for correct ratings. As long as the voltage regulator keeps output below 15 volts, there is no harm to the battery or electronics.
Q3: Is it better to repair my old alternator or replace it?
A3: Rebuilding can be cost-effective if the alternator housing and rotor are still in good condition and a local rebuilder is available. However, installing a new aftermarket or OEM alternator is often more convenient, especially when downtime is expensive on busy job sites. Replace rather than rebuild when the alternator has high hours, severe corrosion, or a history of repeated failures.
Q4: Do I need any special tools to replace a Bobcat alternator?
A4: Most alternator swaps can be done with common hand tools such as metric sockets, wrenches, and a belt tensioner tool. Some models may require removing covers or panels, so a service manual or step-by-step guide is helpful. Always disconnect the battery ground cable before working on the charging system for safety and to protect the alternator from voltage spikes.
Q5: Why does my alternator test fine off the machine but still cause problems?
A5: Bench tests show whether an alternator can produce power, but they do not reveal wiring, ground, or belt problems that exist on the machine itself. Voltage drop in old cables, loose grounds, or slipping belts can cause low charging even when the alternator is healthy. Perform on-machine voltage checks at the alternator post and at the battery while the engine is running to spot these issues. If you find voltage below 13.5 volts at the battery but higher at the alternator, suspect cable or connection problems.
Recommended Alternators at Fab Heavy Parts
1.
Part Number: 6675292, 2200-0501, 22000501, 6678205, 6681857, 6881249, 7008772, 6690593
Applications: The alternator works with the battery to generate power for the electrical components of your equipment.
Alternator Output Amerage: 90
Vehicle System Voltage: 12V
Aftermarket Replacement For Bobcat equipment: The Alternator fits for Skid Steer Loaders: 751, 753, 763, 773, 863, 864, 873, 883, 963, S130, S150, S160, S175, S185, S205, S220, S250, S300, S330, S450, S510, S530, S550, S570, S590
**Fab Heavy Parts is an independent reseller and it is not affiliated with any compact equipment manufacturer.
2.
Part Number: 6675292, 2200-0501, 22000501, 6678205, 6681857, 6881249, 7008772, 6690593
Applications: The alternator works with the battery to generate power for the electrical components of your equipment.
Alternator Output Amerage: 90
Vehicle System Voltage: 12V
Aftermarket Replacement For Bobcat equipment: The Alternator fits for Model: 337, 341, 430, 435, 751, 753, 763, 773, 863, 864, 873, 883, 963; Toolcat Work Machines: 5600, 5610
**Fab Heavy Parts is an independent reseller and it is not affiliated with any compact equipment manufacturer.
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