Finding the right fimco pull behind sprayer parts can be a real headache when you're in the middle of a big job and a nozzle starts leaking or the pump suddenly loses its prime. There's nothing quite as frustrating as hauling a forty-gallon tank out to the back field only to realize a $5 gasket has dry-rotted over the winter. If you've spent any time maintaining a property, you know that these sprayers are absolute workhorses, but like any piece of equipment that deals with chemicals and pressure, things eventually wear out.
The good news is that Fimco builds their stuff to be modular. You aren't usually looking at replacing the whole unit just because a valve cracked. Most of the time, you can get another few seasons out of your rig just by swapping out a few key components. Let's talk about what usually breaks, how to identify what you need, and the best way to get your sprayer back in action without spending a fortune.
The Heart of the Machine: The Pump
Most people don't realize how hard a 12-volt pump actually works until it stops humming. When you're searching for fimco pull behind sprayer parts, the pump is usually the first thing on the list. These are typically High Flo pumps, and they're surprisingly resilient, but they have their limits.
If your pump is running but not moving any liquid, it's probably a diaphragm issue or a bit of debris stuck in the internal valves. You don't always need to buy a whole new pump motor. Sometimes a simple valve plate assembly or a diaphragm repair kit is all it takes. It's a bit of a "surgeon's job" to take the pump head apart, but it saves you a lot of money compared to buying a brand-new 2.1 or 4.5 GPM unit.
The most common failure point, though? The pressure switch. If your pump won't turn on at all, or if it won't stop running even when the wand is closed, that little square switch on the front is likely the culprit. It's a cheap part to replace, and honestly, it's worth keeping a spare in your toolbox just in case.
Nozzles and Booms: Where the Magic Happens
The boom is what makes a pull-behind sprayer so much better than a handheld one, but it's also the part that's most likely to catch on a fence post or a low-hanging branch. When you start looking for fimco pull behind sprayer parts for your boom, you're usually looking for nozzle bodies, caps, or the tips themselves.
Over time, chemicals can erode the orifice in the spray tip. You might not notice it at first, but your "fine mist" starts looking more like a "heavy stream," and suddenly you're burning through your expensive herbicide twice as fast as you should be. Replacing your tips every season or two is just good practice.
Also, don't forget the strainers. There's usually a small mesh screen behind each nozzle. If your spray pattern looks wonky or lopsided, don't blame the pump yet. Pop that nozzle cap off and check the strainer. A little bit of grit or dried chemical residue can choke the flow. A quick soak in some cleaner or a cheap replacement strainer can make the sprayer feel like it's brand new again.
Hoses, Clamps, and Manifolds
Let's be honest: we don't always store our sprayers in a climate-controlled garage. They sit in the shed or under a lean-to, and that means the rubber hoses take a beating from the heat and the cold. If you see cracks starting to form near the fittings, it's time to act before you end up covered in whatever you're spraying.
The manifold—that plastic block where the pressure gauge sits and the lines split off—is another area where you might need fimco pull behind sprayer parts. Since it's made of plastic, it can crack if there's any water left in it during a hard freeze. If you see a hairline fracture leaking water, don't bother with duct tape or epoxy. It won't hold under pressure. Just get a replacement manifold or the specific bypass valve you need.
Speaking of pressure, check your gauge. If the needle is stuck or the glass is fogged up to the point you can't read it, you're just guessing at your application rate. A fresh gauge is one of the cheapest upgrades you can make to ensure you're actually doing the job right.
The Tank and Frame Components
The tank itself is usually the sturdiest part of the whole setup. Fimco uses heavy-duty polyethylene, so unless you backed into a tractor supply trailer, the tank is probably fine. However, the smaller bits attached to it can be a different story.
The tank lid is a classic example. The gaskets inside those lids tend to stretch or get lost. Without a good seal, you've got chemicals splashing out on your mower or ATV every time you hit a bump. And then there's the drain plug. Those little tethered caps are easy to lose, and finding a matching thread can be a pain if you don't look for specific fimco pull behind sprayer parts.
Also, take a look at your frame and wheels. If your sprayer is a few years old, the tires might be losing air or the bushings in the wheels might be wearing thin. Most of these pull-behind units use standard pneumatic tires, but the specific axle spacers and hitch pins are sometimes unique to the Fimco design. Keeping the "pull" part of the "pull-behind" in good shape makes the whole experience a lot less stressful.
Tips for Finding the Right Part Numbers
Nothing is more annoying than ordering a part, waiting three days for it to arrive, and realizing it's for a 15-gallon spot sprayer when you have a 30-gallon boom rig. To avoid the "return shipping" blues, you really need to find your model number.
Usually, there's a sticker on the side of the tank or near the frame. If that's gone (which happens often after a few years in the sun), you can usually identify what you need by the pump model. Most Fimco units use High Flo pumps, and the model number for the pump is almost always on a label on the motor housing.
If you're still stuck, take a photo of the part. Most of the time, fimco pull behind sprayer parts are pretty distinct. The shape of the manifold or the color of the nozzle caps can tell you a lot about which "series" your sprayer belongs to.
Why Fixing It Yourself Is the Way to Go
I've seen people toss a whole sprayer in the scrap heap because the wand wouldn't stop leaking or the pump wouldn't prime. It's a waste of a good frame and tank. These machines are designed to be serviced.
By keeping a few fimco pull behind sprayer parts on hand—like a spare wand, some extra hose clamps, and a nozzle kit—you can fix 90% of the problems that crop up in the field. It saves you the trip to the big-box store and keeps more money in your pocket for the stuff you're actually trying to spray.
Plus, there's a certain satisfaction in hearing that pump click on and seeing a perfect, even mist come out of the boom after you've spent thirty minutes turning a wrench. It's about keeping your gear running as long as possible. With a little maintenance and the right replacement pieces, a Fimco sprayer can easily last a decade or more.
So, before you give up on your leaky rig, take a close look at the components. Most of the time, the fix is simpler (and cheaper) than you think. Just grab the right fimco pull behind sprayer parts, spend an afternoon in the shop, and you'll be back to taming your lawn or pasture in no time.