Cat Parts, a Caterpillar 308 Excavator, or a Crane Operator Career: Pick Your Situation

If you ended up on this page, there's a good chance your search started with "Caterpillar" and then went in three different directions. Or you typed "Caterpillar equipment parts" because you're trying to fix a machine. Or you typed "how to become a crane operator" because you're thinking about a career change. Those are not the same question. I handle purchasing for a 150-person construction company. That means I manage parts and service ordering—roughly $600k a year across three locations—and I spend more time than I'd like on the phone with vendors. I report to both operations and finance, and I've been doing this since 2020. I'm not going to pretend there's one universal answer. There isn't.

If you were actually looking for a willow pump or a hand mixer, I can't help with that. This is about Caterpillar construction equipment. If that's still what you need, keep reading.

First, figure out which situation you're in

Based on the searches I see from our own buyers and from people who land on this page, there are three reasons you might be here:

1. You need Caterpillar equipment parts. Probably for a Cat 308 excavator or something similar.
2. You're thinking about buying a Caterpillar 308 excavator. New, used, or trying to understand the cost.
3. You want to become a crane operator. You heard the pay is good and you're checking what it takes.

These are completely different situations. I'll give you the version of the advice I'd give someone who asked me directly.

Situation 1: You need Caterpillar equipment parts

This is the one I deal with most often. Our company runs a handful of compact excavators, and a Cat 308 is one of them. When someone searches "Caterpillar equipment parts," they usually don't want a parts diagram. They want to know whether to buy a genuine Cat part or save money and go aftermarket.

Genuine vs aftermarket: the honest answer

The conventional wisdom in the forums is that aftermarket parts are basically the same as genuine, at half the price. In practice, I've found it's more complicated than that.

Take hydraulic filters for the Cat 308. A genuine Cat filter costs more, and for a while I used aftermarket filters because, honestly, a filter is a filter. Then we had a machine come down with a hydraulic failure, and the timeline pointed at the filter. I can't prove without a doubt that the aftermarket filter caused it, but the timing was too suspicious. It cost us roughly $1,900 in downtime and an extra service call. I knew I should have ordered the genuine part. I just thought "what are the odds?"

So now my rule is straightforward:

• If the machine is under warranty, buy genuine Cat parts. This is non-negotiable. If a dealer can show that non-Cat parts caused damage, your warranty claim gets denied. It doesn't have to be true in a court, just in their system.
• If the machine is out of warranty and it's a wear item, aftermarket is often fine. Cutting edges, wear plates, certain hoses—these are pretty safe to source aftermarket. Just buy from a supplier with a real location, not a random seller.
• If the part is electronic, go genuine. Sensors, harnesses, ECMs—this is where "compatible" parts start causing problems. I'm not 100% sure why, but we've seen more returned aftermarket electronic parts than ones that actually worked.

To be fair, there are good aftermarket brands. The challenge is telling them apart from the bad ones. If you're working with a dealer that also stocks aftermarket options and backs them, that's a different story. If you're ordering from a website with no return policy, that's a red flag.

Availability matters more than price

It took me about 150 repair orders and one expensive week to understand that parts availability is more important than the sticker price. What good is a part that's $50 cheaper if the excavator sits for an extra week? Before I order anything now, I ask two questions: "Do you have it in stock?" and "If not, what's the actual lead time?" Not shipping time. Lead time. They are not the same thing, and lead time is what ends up costing you.

Also, get the serial number before you call about parts for a Cat 308. I once asked for a "standard seal kit" and the supplier heard "same as the model they sold us in 2019." It wasn't. We had to reorder. Write the serial number on a sticky note next to the machine and save yourself the grief.

Situation 2: You're deciding whether to buy a Caterpillar 308 excavator

Maybe you're not here for parts. Maybe you're looking at a Caterpillar 308 excavator and trying to decide if you should buy one. This is a bigger decision, and it's not the same for every company. It depends on hours, maintenance history, and what you're actually going to do with it.

Three years ago, I would've said buy used and let someone else eat the depreciation. That's the standard advice. After watching our fleet, I'd push back.

If you're going to put 1,000 hours on a machine every year, a new Cat 308 can actually be cheaper over five years if you factor in the warranty, predictable maintenance costs, and financing. If you're buying a machine for occasional jobs, a used excavator with good records makes more sense. There's no universal winner.

If you go used, watch for:

• No maintenance records. This is almost a deal-breaker on its own.
• Undercarriage wear that doesn't match the hours. The meter can tell one story and the tracks another.
• Parts and service support. A Cat dealer two hours away is different from a Cat dealer two blocks away. If the nearest dealer is far, the cost of the 308 goes up the first time it breaks.

Granted, used equipment can be a great value. The machines I'd avoid are the ones with no paper trail. If someone says "rebuilt" but can't show you invoices, that's not a good sign.

Situation 3: You want to know how to become a crane operator

Okay, first let me be straight about my lane. I'm not a crane operator. I'm the person who schedules crane services and talks to operators. But that means I know a little about what it takes to get hired.

The good news is cranes are still in demand, and the pay is solid. The bad news is it's not an unskilled job you can learn in a weekend. In the U.S., most construction sites require an operator certification under OSHA rules (29 CFR 1926.1427). The National Commission for the Certification of Crane Operators, or NCCCO, is the organization you'll keep running into. You'll also probably need a CDL, because cranes have to be moved.

The path usually looks like one of these:

1. Apprenticeship or trade school. You spend time as an oiler or rigger, take classes, and work your way up. It takes time, but it's the traditional route.
2. Entry-level work at a crane rental company. This is more common than people think. Show up, work hard, get a rigging cert, and you might get sponsored for crane operator training.
3. Pay for your own training. It costs real money and doesn't guarantee a job, but it can get you past the first screening.

Here's the part I want to stress: Caterpillar is a heavy equipment manufacturer, not a certification school. Their lineup is mostly excavators, dozers, loaders, and engines. The cranes you train on are often from other specialist crane manufacturers. That's not a knock on Caterpillar—it's just not the same business.

Bottom line: if your goal is to become a crane operator, start with OSHA, NCCCO, and local crane companies. Not with a brand name. Caterpillar may be the equipment you eventually operate, but it's not the pipeline you need for certification.

How to tell which situation you're in

Still not sure? Use the search you typed.

• If you searched "Caterpillar equipment parts" or "Cat 308 parts," you're in Situation 1. Get the serial number, check stock and lead time, and decide on genuine vs aftermarket based on warranty status.
• If you searched "Caterpillar 308 excavator for sale" or "used Cat 308," you're in Situation 2. Compare hours, records, and local dealer support before you think about price.
• If you searched "how to become a crane operator," you're in Situation 3. Call a local crane rental company and ask what they look for. Do that before you spend money on training.

There's no one-size-fits-all answer. I know that sounds like a cop-out, but it's not. It's the truth. Each of those situations has a clear next step. Take that step, and the next one usually becomes obvious.