John Deere X320 vs. X310 (Model Comparison)

The X320 has the larger engine and may have a wider 54-inch deck, while the X310 uses a smaller engine and is associated with a 48-inch deck. Both are gasoline, four-cycle riding mowers, not two-cycle tools. Choose by the deck you need, the ground you mow, and the actual condition of the machine—not model number alone.

If you are comparing used X310 and X320 mowers, the engine and deck are the clearest differences. A wider deck can cover open lawn faster, but it may not fit your gates or suit uneven ground. The X320’s extra engine output is useful context, not proof that a particular mower will cut better. Wear, setup, and service history matter too.

I start a comparison by checking the machine’s model and serial numbers, engine label, and deck identification. Those details help confirm what is actually installed, which matters because equipment can vary by model year and may have been changed over time. Use the matching John Deere operator’s manual for service steps, safety limits, and parts.

X310 and X320: the main differences

This comparison covers the basic model-family differences most buyers need to know: engine, rated output, and mower deck. It does not assume that every mower has its original deck or equipment. Confirm the labels and manual for the specific machine before buying parts or making a service decision.

Displacement is the volume swept by an engine’s pistons. It is one measure of engine size, but it does not tell you how well a used mower has been maintained. Rated horsepower also should not be treated as a direct measure of cutting speed or mowing quality.

Both engines use straight gasoline and have separate crankcase oil. They do not use a two-cycle gasoline-and-oil mix. If you also own a two-cycle trimmer or blower, keep its fuel instructions separate from the mower’s.

How to choose between the X310 and X320

The X310 may suit a buyer who needs a 48-inch mower and finds a well-kept example at a fair price. The X320 offers more rated engine output and may be equipped with a 54-inch deck. Choose based on access, lawn conditions, and machine condition rather than assuming the larger model is always the better purchase.

Choose for your lawn and access

A 54-inch deck can cut a wider path than a 48-inch deck, but it also needs more room to pass between obstacles. Measure narrow gates and storage openings before choosing. If the mower must make frequent turns around trees, beds, or tight corners, deck width alone will not tell you which machine will be easier to use.

For open, reasonably even lawn, a wider deck may help cover ground in fewer passes. On bumpy or uneven areas, the fit and condition of the deck, blades, and mower setup deserve close attention. Neither model should be used beyond the limits in its operator’s manual, and neither is a brush-clearing machine.

Consider engine output in context

The X320’s listed 22 hp is higher than the X310’s 18.5 hp. That difference may matter when comparing otherwise similar machines, but it cannot make up for dull or damaged blades, poor maintenance, or a deck that is not suited to the site. Confirm the engine label because the model name alone does not verify which engine is now installed.

Do not assume that the two models have identical handling, slope limits, or capability with every deck or attachment. Check the manual for the specific mower and installed equipment. If traction or stability feels uncertain, stop and choose a safer route rather than continuing across a slope.

Equipment identification, setup, and safety preparation

Before comparing or operating either mower, identify the machine and inspect its main safety and cutting parts. The model number, serial number, engine label, and deck identification help you match the right manual and parts. A quick inspection can also reveal damage or missing equipment that makes a low asking price a poor value.

1. Record the identifiers. Find the mower’s model and serial numbers, then check the engine label and deck identification. Match those details to the applicable John Deere manual before ordering parts or using service values. The model-family specifications in this guide are not a substitute for machine-specific information.

2. Inspect the mower while it is off. Check tires, steering, brakes, guards, the discharge deflector, and visible wiring and hoses. Look for leaks or damage. With the mower on level ground, check engine oil by the procedure in the manual. Do not guess at oil type or service intervals.

3. Check the mowing area. Keep bystanders clear. Remove stones, wire, and other objects that blades could throw. Do not mow where people, pets, or property could be struck by debris.

4. Start it safely. Follow the manual’s cold- or warm-start steps. Start from the operator’s seat with the transmission in neutral, parking brake set, and mower blades disengaged. Do not bypass or defeat safety interlocks.

A mower that starts is not necessarily ready to mow. A damaged deflector, worn tire, or blade problem can affect safe operation even when the engine runs normally. Treat inspection as part of the comparison, not as a task to postpone until after purchase.

Field mowing operation and deck selection

The deck is the assembly beneath the mower that houses the cutting blades. Its width affects access and the path cut in each pass, while its condition affects mowing results. Match the deck to your property, then operate at a controlled pace and follow the manual’s instructions for terrain, slopes, and mowing pattern.

A 48-inch deck is associated with the X310 and may also be found on an X320. Some X320 configurations used a 54-inch deck. Do not identify a deck by mower model alone; check its label and verify that it is approved for the mower.

These are decision scenarios, not claims about a particular owner’s experience. When mowing, avoid abrupt turns and wet or unstable ground. Follow the model-specific slope guidance and mowing pattern. Never assume the X310 and X320 have the same safe slope limits, especially when their decks or attachments differ.

Neither mower is designed for tree felling or brush clearing beyond its mower-deck design. Do not use the cutting deck to tackle woody growth or material it was not built to cut. If the mower loses traction or feels unstable, stop and move to a safer plan.

Maintenance, blade service, and engine checks

Routine care helps you judge whether an X310 or X320 is ready for another season. Use the correct manual for oil, filters, fuel-system checks, blade removal, and service intervals. The engines are four-cycle, so their fuel is not mixed with two-cycle oil; engine oil belongs in the crankcase as directed by the manual.

Before mowing, check the oil on level ground using the manual’s method. Look for leaks, loose or damaged parts, and unusual changes in how the engine runs. If the engine is hard to start or runs poorly, confirm the basics first, including fresh fuel appropriate for the mower and the correct start procedure. Use the manual for fuel-system diagnosis rather than applying a trimmer or blower procedure.

A mower’s blade edges and deck condition affect its cut. For blade inspection or service, follow the manual’s exact steps. Remove the key, prevent the machine from starting, and keep clear of sharp edges. Do not work under a mower supported only by a jack, and do not rely on an interlock as a substitute for safe shutdown.

After use, disengage the blades, stop on level ground, set the parking brake, remove the key, and wait for the blades to stop and hot parts to cool. Clean the deck only by a method allowed in the manual. Check for damage before the next mowing session.

Used-mower comparison: practical decision examples

A useful comparison separates verified facts from seller claims. These examples show how to assess common buying situations; they are not reports of specific machines or field tests. In each case, compare the actual mower, deck, and records rather than relying on the X310 or X320 name alone.

• The X310 is clean and the X320 has visible neglect. Do not treat the X320’s higher rated output as a reason to overlook damage or missing safety parts. Ask for the model and serial numbers, inspect the engine and deck, and compare repair needs.
• Both machines run, but you need to pass through a narrow gate. Measure the opening and the actual mower width. A listed deck width is not the full machine width, and a 54-inch deck may not suit the route.
• The X320 has a 48-inch deck rather than a 54-inch deck. That can be a valid configuration. Verify its deck identification and compatibility instead of assuming a listing is wrong or that the machine has been altered.
• A seller cannot identify the engine or deck. Pause before ordering parts or agreeing to service claims. Labels and the correct manual provide a firmer basis than a model name in an advertisement.

For either mower, check starting behavior, steering, brakes, tires, deck condition, guards, and signs of leakage. If you cannot inspect it safely or verify what is installed, consider having a qualified technician examine it. A lower price does not show the likely cost of repairs.

Storage and seasonal care

Seasonal storage is part of comparing mower condition, especially when a machine has sat unused. Follow the manual’s storage instructions for the exact model and engine. Before putting either mower away, make sure it is clean, inspect for damage, and note any service that will be due before the next mowing season.

Use the manual for fuel-storage guidance and any required preparation. Do not apply storage steps from a two-cycle trimmer to a four-cycle riding mower. Keep the mower in a secure, dry location, away from ignition sources and where children cannot reach the key or controls.

Before the first mow after storage, inspect tires, controls, guards, the deflector, and the deck. Check engine oil with the mower level and follow the manual’s start procedure. If you find a leak, damaged safety equipment, or uncertain blade condition, address it before mowing.

Conclusion: which model should you buy?

The X310 is the smaller-engine option, with an approximately 603 cc Kawasaki FS600V rated at 18.5 hp and an associated 48-inch deck. The X320 uses an approximately 675 cc Kawasaki FS651V rated at 22 hp and may have a 48- or 54-inch deck. Verify the mower’s labels and equipment because configurations can vary.

For a final choice, match deck width to your access and lawn, review the machine’s condition, and consult the correct manual for safe operation and service. A well-kept mower with the right deck may be a better fit than a larger model that is worn or unsuitable for your property.

Frequently asked questions

These direct answers cover the most common points buyers compare when considering the X310 and X320. Use them as a starting point, then confirm the exact mower’s identity, installed deck, and service instructions. A model-family specification does not replace the operator’s manual or the labels on the machine.

Is the X320 more powerful than the X310?
Yes. The X320’s Kawasaki FS651V is rated at about 22 hp; the X310’s Kawasaki FS600V is rated at about 18.5 hp.

What is the engine displacement of each mower?
The X310 engine is approximately 603 cc. The X320 engine is approximately 675 cc.

What deck sizes are associated with these models?
The X310 is associated with a 48-inch deck. The X320 was offered with 48- or 54-inch decks, depending on year and equipment.

Does the X320 always have a 54-inch deck?
No. Some X320 configurations used a 48-inch deck. Check the installed deck’s identification.

Does either mower use a two-cycle fuel mix?
No. Both have four-cycle gasoline engines with separate crankcase oil. Use straight gasoline as directed by the applicable manual.

Can I use the model number alone to order parts?
No. Check the model and serial numbers, engine label, and deck identification, then confirm fit with the relevant parts information.

Which mower is better for a small or tight yard?
The best fit depends on access and deck width. Measure gates and storage openings; a 48-inch deck may be easier to accommodate than a 54-inch deck.

Is the X320 automatically better for a large lawn?
Not automatically. Its higher rated output and possible wider deck may suit some open lawns, but condition, setup, and the property’s terrain also matter.

Can either mower cut brush or fell trees?
No. These are riding mowers for their approved mower-deck use, not tree-felling or general brush-clearing machines.

Are the X310 and X320 safe on the same slopes?
Do not assume so. Follow the slope limits and mowing instructions in the manual for the exact mower and installed equipment.

(This article was written by one of our staff writers, Harrison Croft. Visit our Meet the Team page.)