7 John Deere x758 Problems & Quick Fixes

John Deere x758 Problems Image

A maximum cutting height of 133mm, a wider cutting edge of 122cm, high torque, and durability makes John Deere x758 one of the best lawn mowers out there.

It’s a fine piece of machinery with great reviews from users. However, you might experience a few problems while operating the John Deere x758 lawn mower.

In this article we discuss seven John Deere x758 problems based on hundreds of verified users’ reviews, John Deere representatives, and our expert opinion.

From starter problems, engine overheating issues, rough running, electrical system issues, faulty electrical wiring and more mechanical issues we have you covered.

Read on to find out what exactly is ailing your John Deere x758 lawn mower.

7 Common John Deere x758 Problems

1. Engine overheating issues

Most users complain about engines overheating in their S700 signature models, and the John Deere X758 is no exception.

Several owners say it heats a lot. That could be because the deck discharge is too close to where air comes in. A blocked screen then results in a hot engine.

However, there are other reasons for Yanmar diesel engines’ heat, including bad engine oil, faulty bearings, excess weight, and even heat from the sun.

There are temporary solutions to reduce overheating caused by sunlight. Another probable cause for overheating is the motor. It’s a common problem for users who don’t maintain the right oil level.

Solutions include ensuring the air inlet, which is too close to the deck discharge, is aerated, using the best type of oil, maintaining the right oil level, fixing oil pressure issues and any blockage caused by internal bearings, and avoiding excess load on the engine.

2. Rough running issues

A clogged or faulty carburetor is often to blame for a John Deere tractor’s engine running rough.

You’re also likely to experience this problem if the mower gets hit while driving. Sometimes, when X785 hits something during operation, the flywheel key breaks, turning the ignition timing off.

A faulty spark plug that is covered by oil, fuel, or carbon deposits could also lead to a rough-running engine.

You’ll also experience this problem if dirt blocks the cooling fins or the air filters become clogged.

Solutions include fixing or replacing the carburetor, changing the spark plug if it’s dirty, and draining stale fuel and refueling with clean fuel.

In case of low engine compression, the fix is adjusting the valve lash.

3. Stalling problems

This is one of the common problems with John Deere X758. The mower starts and then stops. It could also run normally, but once you turn it off, it doesn’t start.

Most users and experts linked this issue to poor fuel injector pump timing, clogged fuel injection pump or dirty fuel filters.

If the fuel pump cannot push fuel, the lawn tractor will stall, or the engine will stop.

Another likely reason for a stalling X768 engine is a problem with the coolant. It’s normal for motors not to run properly in cold weather. A coolant that’s too cold will have the same effect on a vehicle.

If this is the case, the fix is easy—give your mower a few minutes to heat properly (we love to think of it as allowing your mower to take its sweet time).

Stalling problems are also rampant in John Deere 3039r.

4. Engine starting problems

Yanmar started making John Deere’s compact utility tractor engines in the 70s, long after Yanmar pioneered and mastered the making of small engines.

They released their first commercial diesel engine in 1933, and they’d been perfecting it since.

While most users attest to the top quality of Yanmar engines, a couple of things could cause your Yanmar engine starting issues.

From problems with fuel injection pump adjustment to clogged fuel lines, and dirt and debris in the fuel system, the potential causes for starting issues are many.

Luckily, the fixes are as easy as adjusting the fuel injection pump as required, clearing clogged up fuel pipes, removing debris and dirt from the fuel system, and draining the stale fuel and replacing with fresh fuel.

Another possibility is damaged and, or faulty electrical connections. A simple check to see if every connection is correct and in place should fix the problem.

Redo the wiring and replace any worn-out parts of the lawn tractor. If all of that fails, check the starter.

If faulty, they cause start issues. Check the starter to ensure it’s in good shape and if necessary, replace the defective parts.

Sometimes though, it’s just the brake pedal that hasn’t been pushed down. Of course, the engine will not start. So, yes, check this.

Other likely causes and solutions include low cylinder compression—which mostly happens with blown head gaskets, dirty and old fuel in the tank, which ruins the fuel lines, or a clogged fuel injection pump.

If the fuel filter is plugged, you need to replace it while a fuel injection pump malfunction is easily repairable.

It’s also advisable to test the fuel transfer pump output by checking and adjusting the valve clearance.

5. Electrical issues

So, your John Deere X758 won’t start and you suspect the problem is the starter? No, it’s not. A lot of times, electrical problems present as engine problems.

You can waste time trying to fix a starter that’s not faulty, when all you need to do is change the main fuse and the battery will start charging, resolving the issue fast.

Besides a blown fuse, you might need to deal with electrical issues caused by damaged electrical parts, faulty electrical wiring, dirty or broken battery terminals, and such.

A battery with low voltage will also cause electrical issues, so charge the battery. If it won’t charge, check the wiring—maybe the wires are broken.

It’s also a good idea to check your battery cells. If any has failed, replace it. And, remember to only mount the battery when you need it during winter, don’t leave it in your X758.

We know fixing electrical issues sounds like “serious business” but you can fix them on your own if the issues are minor. For example, changing a broken fuse to get the battery cells to charge.

Other easy fixes for common electrical issues include replacing broken wires and cables, and cleaning your batteries’ terminals to remove rust or corrosion by soaking an old toothbrush in vinegar, pouring a little baking soda on it, and then brushing the terminals.

Connect your light plug if the lights are not working. Maybe it’s not properly attached. Also, replace the lamp if it’s damaged, and ensure the wiring is correct.

6. Mechanical issues

X758 doesn’t seem to have as many mechanical issues as other models but we noted a couple of things that users complained about.

Clogged discharge chute, belt tension—which you can fix by loosening, and poor alignment of pulleys and belts.

You might also have to deal with excessive vibration caused by worn-out parts or components and dirty pulleys and deck.

Fixes include reducing the speed and your mower deck’s height if grass is overgrown, avoiding wet grass, replacing loose belts, cleaning the pulleys and deck (which will also resolve excessive vibration), and balancing the blades.

7. Corroded battery terminals

Corroded battery terminals is a common problem with lawn tractors and mowers. And, there’s no troubleshooting, really.

You just need to look at the battery terminals. If they’re covered in rust or corrosion, they need some cleaning. Grab an old toothbrush, a little lemon juice or vinegar and baking soda.

Sprinkle baking soda on the dirty terminals, then dip the toothbrush in the lemon juice or vinegar and dab it on the terminals.

Allow the reaction to take place for a few seconds before brushing the battery terminals and cleaning it all off with a wet cloth or swabs soaked in water.

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Is the John Deere X758 a good mower?

We think John Deere x768 is a wonderful product line in the x700 tractors range. Users say it proves more valuable than other similar machines. From its new seating design, to a strong exterior and a reliable mowing deck—which is well-suited for smaller farms, there’s nothing to not like about John Deere X758.

How much does a John Deere X758 cost?

This depends on where you’re buying and whether it’s new or used. There are so many options online. If you’re looking to buy a new tractor from John Deere, it’ll come with a 4-year/ 700-hour bumper-to-bumper warranty and you can expect to spend $14,829 going up (depending on the time of buying because prices fluctuate).

You also have the option of building your own X758—which we think is really cool! You can add or get rid of some features to get your configured product based on your needs.

What engine is in a John Deere X758?

The John Deere X758 lawn/ garden tractor is run by a Yanmar 3TNM74 diesel engine. This liquid-cooled engine has 3 cylinders and is known for fuel economy and durability.

The 24 hp (17.9 kW) diesel engine provides high torque. Yanmar 3TNM74’s intake air passes through the screen panels on both sides of the tractor, which keeps dirt from getting into the radiator or air cleaner.

What are John Deere X758’s specifications?

The X758 is one of John Deere’s 4WD lawn and garden tractors from the X700 series. John Deere started making this model in Horicon, Wisconsin, in 2013. According to John Deere, this Signature Series Lawn tractor has unique features, including:

  • 24-hp (17.9 kW) with a three cylinder liquid-cooled diesel engine.
  • Hydrostatic four-wheel drive, Accel Deep™ mower deck, high-capacity mower deck (60 inch mower), power steering, hydraulic/ electric lift system, Twin-Touch™ forward and reverse foot pedals, heavy-duty all-purpose tires.
  • Four year/ 700 hour bumper-to-bumper warranty from the manufacturer.

What is the life expectancy of a Lawn Mower?

With great care, a John Deere lawn mower will serve you for 10+ years. If you don’t do maintenance as often as required, it can work for about five years (that’s half its life expectancy!) Regular maintenance on your X758 lawn mower, especially the engine, extends life and helps it perform at its best throughout the season. 

Summing Up!

John Deere x758 problems: are they a deal-breaker? We don’t think they are. The X758s is an excellent machine, especially if you are more interested in it as a lawnmower—not a heavy duty vehicle. It’s comfortable, sturdy for its size, compact and takes little space.

You can’t run away from John Deere X758 problems but you can easily troubleshoot and fix a majority of these problems without going to a mechanic.

Some problems are also common among other lawn tractors. If you have experience with other vehicles, you can save money by fixing your X758 on your own.