As a track skid steer loader supplier, I’ve worked with dozens of operators and fleet managers who overlook hydraulic pressure testing until they’re stuck mid-job with a loader that won’t lift pallets, tilt a brush cutter, or push snow up a driveway. Over the past 12 years in this industry, I’ve seen firsthand that ignoring hydraulic pressure issues turns small, avoidable repairs into costly downtime—sometimes costing operators thousands of dollars in lost productivity before they even realize there’s a problem. Testing your loader’s hydraulic system regularly isn’t just a maintenance task; it’s the most reliable way to keep your machine running at peak efficiency, whether you’re running a compact model for residential landscaping or a heavy-duty unit for commercial construction. Today, I’m breaking down how to test hydraulic pressure on a track skid steer loader, step by step, with tips I’ve picked up from working alongside operators and training our own service teams. Track Skid Steer Loader
First, let’s get clear on why hydraulic pressure matters for track skid steers specifically. Unlike wheeled skid steers, track models rely on their hydraulic system for two core functions: powering the drive motors that move the tracks, and operating every attachment—from augers and trenchers to grapples and snow blowers. If your hydraulic pressure is too low, you’ll notice sluggish operation: the loader might take 2 full seconds to lift a 2,000-pound pallet, or the track drive will hesitate when you’re maneuvering up a muddy incline. Too high, and you’re risking seal damage, hose bursts, or even component failure that could leave you needing to replace a hydraulic pump or motor. Most track skid steers have a specified operating pressure range stamped on the machine’s hydraulic decal (usually between 3,000 and 3,500 PSI, depending on the model), so that range is your benchmark for all testing.
Before you start testing, you need to make sure you have the right tools—and that you’re prepared safely. Working with hydraulic systems means high-pressure fluid, which can cause serious injury if it’s released improperly. The last thing anyone wants is a spray of hot hydraulic fluid in their eyes or under their skin. First, grab a reliable hydraulic pressure gauge: I always recommend a digital gauge with a range of 0 to 5,000 PSI, since most track skid steers won’t exceed that maximum. Analog gauges work too, but digital ones are easier to read in bright sunlight or low light, and they hold a charge for years if you pick a quality brand. Next, you’ll need a set of hydraulic test hoses with proper fittings to match your loader’s test ports—those ports are typically located on the hydraulic pump, the control valve, or the attachment couplers, so double-check your operator’s manual to confirm the port size (most are 1/4-inch NPT, but some heavy-duty models use 3/8-inch). Finally, safety gear is non-negotiable: wear safety glasses, heavy-duty work gloves, and a long-sleeve shirt. Always make sure the loader is on a flat, level surface, the engine is off, the key is removed, and all attachments are lowered to the ground before you start working on the hydraulic system. Never test pressure with the engine running unless you’re specifically instructed to for that step—starting with the engine off helps prevent accidental movement and makes it easier to spot leaks or loose fittings.
Now, let’s walk through the step-by-step testing process. The most accurate way to test hydraulic pressure on a track skid steer is to test two key circuits: the main hydraulic circuit (which powers all attachments) and the drive circuit (which powers the tracks). Let’s start with the main circuit, since that’s what most operators use most often.
Step 1: Locate the main test port. On most track skid steer models, this port is located near the main control valve, usually on the side of the machine near the rear of the loader. If you can’t find it, pull your operator’s manual—this is a common spot that gets covered in mud or grease, so you might need to wipe it down to see it. Once you’ve found the port, attach your test hose and gauge securely. Make sure the fitting is hand-tightened first, then use a wrench to give it a 1/4 turn—over-tightening can damage the port or the gauge.
Step 2: Test the relief valve pressure. The relief valve is designed to prevent the hydraulic system from exceeding maximum pressure, so this test checks that the valve is working correctly. Start with the engine off, then start the engine and let it idle at full RPM (check your manual for the correct idle speed—usually around 2,200 RPM for most track skid steers). Next, activate a single hydraulic function that’s connected to the main circuit—for example, fully lift the loader arms, then hold them at the top position. This will force the hydraulic system to build pressure against the relief valve, and your gauge will show the maximum pressure. Most track skid steers should read between 3,100 and 3,500 PSI for the main circuit. If it’s below 3,000 PSI, you have a problem with the relief valve, a clogged filter, or a worn hydraulic pump. If it’s above 3,600 PSI, that means the relief valve is stuck closed, which can cause hose bursts or component damage.
Step 3: Test individual attachment function pressures. Once you’ve tested the main circuit, it’s a good idea to test specific attachments if you use them regularly. For example, if you use a grapple, attach the grapple to the loader’s couplers, then hook your test gauge to the grapple’s hydraulic line instead of the main port. Activate the grapple to close it fully—you should get a reading between 2,800 and 3,200 PSI, depending on the attachment. If it’s lower, the problem is likely in the attachment’s hoses or the couplers, not the main hydraulic system.
Next, let’s test the drive circuit, which is unique to track skid steer loaders. The drive circuit powers each track individually, so uneven pressure here can cause steering issues, excessive track wear, or even damage to the drive motors.
Step 1: Locate the drive test ports. Most track skid steers have two test ports, one for the left track drive motor and one for the right, located near the rear wheels (or idlers, for track models) on the side of the machine. Again, wipe away mud or grease to find them—they’re usually marked with a “D” or “Drive” sticker.
Step 2: Test drive pressure for each track. Attach your gauge to the left drive port, start the engine, and drive the loader forward in a straight line for 10 seconds, then hold it in forward gear. Your gauge should read between 3,000 and 3,400 PSI for the drive circuit. If you have a helper, have them turn the steering wheel all the way to the left—you should see a slight increase in pressure on the right track (since the loader is pivoting) of around 200 to 300 PSI. If there’s no increase, or if one track reads more than 500 PSI lower than the other, that means there’s a leak in one drive motor, a clog in a drive line, or a worn pump. Repeat this test for the right track to confirm both readings are within the same range.
Now, what do you do if your pressure readings are off? Over the years, I’ve helped hundreds of operators troubleshoot common issues that cause low or high pressure. The most common culprit by far is a dirty or clogged hydraulic filter. If your pressure is 500 PSI lower than the manufacturer’s range, the first thing to check is the hydraulic filter—we recommend changing it every 500 hours of operation, or every 300 hours if you work in dusty or muddy conditions. A clogged filter restricts fluid flow, so it can’t build the pressure it needs to power the loader. Next, check the hydraulic fluid level—low fluid can cause air to enter the system, which creates spongy operation and low pressure. Make sure the fluid is at the correct level on the dipstick, and that the fluid is clean (dark, gritty fluid means it’s time for a flush and change).
If your pressure is still off after changing the filter and checking fluid, the next step is to look for leaks. High-pressure leaks are easy to spot—you’ll see fluid on the hoses, ports, or around the hydraulic pump. A small leak in a hose can cause enough pressure loss to make your loader sluggish, so even a tiny leak (no bigger than a dime) needs to be fixed immediately. For relief valve issues, if the pressure is too low, you can adjust the relief valve using the adjustment screw (check your manual for how to do this safely), but if adjusting it doesn’t work, the valve is likely worn and needs to be replaced.
One of the biggest mistakes I see operators make is skipping pressure testing entirely until they have a major failure. Testing your hydraulic pressure once every 100 hours of operation—about once a month for most operators—takes less than 30 minutes, and it can save you from spending thousands of dollars on repairs. For example, a clogged filter is a $20 part and a 10-minute fix, but a worn hydraulic pump that’s caused by operating at low pressure for months can cost $2,000 or more to replace. We also recommend testing pressure before starting a big job, like a landscaping project or a construction site, so you can catch issues before you’re in the middle of a deadline.
As a track skid steer loader supplier, I’ve designed our products with easy maintenance in mind—including accessible test ports and clear operator’s manuals to guide you through testing. If you’re not comfortable testing hydraulic pressure on your own, our team offers on-site maintenance services and training for operators who want to learn how to care for their loaders. Whether you’re a small business owner with one loader or a fleet manager with 20 units, keeping your hydraulic system in top shape is key to getting the most out of your investment. If you have questions about testing, maintenance, or upgrading your track skid steer loader, we’re here to help you navigate the right solutions for your needs.
Lawn Mower References:
- Society of Automotive Engineers. Hydraulic System Maintenance Guidelines for Construction Equipment. SAE International, 2021.
- Caterpillar Inc. Track Skid Steer Loader Hydraulic Pressure Testing and Troubleshooting Manual. Caterpillar Global Maintenance, 2022.
- International Organization for Standardization. Agricultural and Construction Machinery – Hydraulic Fluid Systems – Maintenance and Testing. ISO 18265:2020, ISO Press, 2020.
- Compact Equipment Magazine. 2023 Maintenance Guide: Hydraulic Systems for Compact Construction Loaders. Forster Media, 2023.
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