If your kubota d1105 starter is making that annoying clicking sound instead of firing up your engine, you're probably looking for a quick fix so you can get back to work. There's nothing quite like the sinking feeling of turning the key on a crisp morning and hearing well, absolutely nothing. Or worse, that frantic click-click-click that tells you the battery is trying its best but the starter just isn't having it.
The Kubota D1105 is a legendary little engine. It's the three-cylinder workhorse you'll find in everything from mini-excavators and zero-turn mowers to portable generators and small tractors like the Kubota B-series. It's generally bulletproof, but like any mechanical component that lives its life covered in dust, grease, and vibrating like crazy, the starter motor is eventually going to throw a tantrum.
Is It Really the Starter?
Before you go out and drop a couple hundred bucks on a new kubota d1105 starter, it's worth doing a bit of detective work. In my experience, about half the time someone thinks their starter is shot, it's actually a "delivery" issue. By that, I mean the electricity just isn't getting to where it needs to go.
Think of it like a garden hose. If you aren't getting water at the nozzle, the nozzle might be broken, sure. But more likely, the hose is kinked or the faucet isn't turned on all the way.
The first thing to check is your battery terminals. It sounds basic, but you'd be surprised how many "broken" starters are actually just victims of a little white crusty corrosion on the battery posts. Give them a good wiggle. If they move, they're too loose. Clean them up with a wire brush until they shine, tighten them back down, and try again.
Next, check your grounds. The starter needs a solid path back to the battery to complete the circuit. Since the starter is bolted to the engine block, that block needs a clean connection to the frame and the battery. If those cables are frayed or the mounting bolts are rusted, the starter won't get enough juice to turn the engine over, especially a high-compression diesel like the D1105.
Understanding the "Click"
If you hear a single, loud clunk or click when you turn the key, that's usually a good sign that the solenoid is engaging. The solenoid is that smaller cylinder sitting on top of the main starter motor. Its job is twofold: it pushes the starter gear (the bendix) forward to mesh with the engine's flywheel, and it acts as a heavy-duty switch to send big power to the motor itself.
If it clicks but doesn't spin, the internal contacts inside that solenoid might be burnt out. It's a common issue. Over years of use, those copper contacts get pitted and carbon-scored until they just don't pass current anymore.
On the other hand, if you hear a rapid-fire clicking (like a machine gun), that almost always means your battery is weak. There's enough power to throw the solenoid forward, but as soon as the motor tries to draw the heavy current it needs to turn the engine, the battery voltage drops, the solenoid releases, the voltage bounces back up, the solenoid fires again and you get that clicking sound. In that case, grab a jumper pack or a charger before you start pulling bolts.
The Famous Hammer Trick
We've all seen it. Someone grabs a ball-peen hammer and gives the kubota d1105 starter a solid "love tap" while someone else turns the key. And surprisingly often, it works!
Why? Usually, it's because the brushes inside the motor are worn down or stuck. A starter motor uses carbon brushes that ride on a spinning commutator. Over time, they wear out or get stuck in their holders due to dust and grime. A sharp vibration from a hammer can sometimes jar them just enough to make contact one last time.
Just keep in mind that the hammer trick is a "get it back to the barn" fix, not a permanent solution. If you have to hit your equipment to get it to start, it's telling you that it's time for a replacement.
Removing and Replacing the Starter
If you've determined that the motor is definitely the problem, replacing it isn't actually that bad of a job. Most D1105 setups have the starter located on the side of the engine block, held in by two main bolts.
Before you touch a wrench, disconnect the negative battery cable. This is the most important step. The main power wire going to the starter is live and un-fused. If your wrench touches that terminal and the frame at the same time, you're going to see some scary sparks and potentially melt your tool or hurt yourself.
Once the power is off, you'll usually need a 12mm or 14mm socket to get the mounting bolts out. Depending on whether the engine is in a tractor or a generator, access might be tight. You might have to remove a side panel or an air intake hose to get a clear shot at it.
Once the bolts are out, the starter should slide right out. It's heavier than it looks, so watch your fingers!
Choosing the Right Replacement
When looking for a new kubota d1105 starter, you'll see a massive range in prices. You can find "no-name" versions online for incredibly cheap, or you can go to a Kubota dealer and buy the genuine OEM part for a lot more.
Is the expensive one worth it? It depends on how you use your machine. If you're a contractor and your mini-excavator makes you money every single day, I'd lean toward a high-quality unit. Downtime is expensive. However, if it's for a backup generator that runs twice a year or a hobby tractor, some of the mid-range aftermarket starters are surprisingly decent.
Just make sure you match up the tooth count on the gear. Most D1105 starters have 9 teeth on the drive gear, but it's always smart to count them on your old one just to be 100% sure. Putting the wrong gear in there is a great way to chew up your flywheel, and trust me, replacing a flywheel is a much, much bigger job than replacing a starter.
A Note on Safety Switches
Before you go through all the work of swapping parts, double-check your safety switches. I can't tell you how many times I've seen people get ready to pull a kubota d1105 starter only to realize the PTO lever was slightly engaged or the transmission wasn't perfectly in neutral.
Kubota machines are safety-conscious (sometimes to a fault). If the seat switch, the neutral switch, or the PTO switch isn't happy, the starter won't even get the "signal" to turn over. If you turn the key and get absolutely no sound at all—not even a click—check those levers first. It might save you an afternoon of greasy knuckles.
Keeping It Healthy
Once you've got your new starter installed and that D1105 is purring again, you probably want to make sure you don't have to do this again for a long time.
The biggest killer of starters is heat. If the engine doesn't fire up within 10 or 15 seconds, stop cranking. Give the starter a minute or two to cool down. These motors are designed for short bursts of high power, and they get hot incredibly fast. If you just sit there and grind the starter for a minute straight, you're basically cooking the internal windings.
Also, keep the area around the starter clean. If it's buried in oil and dirt, it can't dissipate heat, and that grime can eventually work its way into the solenoid. A quick spray with some degreaser every now and then during your routine maintenance goes a long way.
At the end of the day, the kubota d1105 starter is a simple part of a great engine. Treat it right, make sure your battery is healthy, and it'll usually give you years of reliable service without much fuss. But when it does finally quit, don't sweat it—it's a straightforward fix that most folks can handle with a basic set of tools.