7 Most Common John Deere 757 Problems and Solutions

John Deere 757 Problems

The 757 zero-turn lawnmower is durable and tough. It has big wheels—perfectly suited for rough terrain and a Kawasaki 250 hp engine that offers plenty of power to accomplish tasks quickly.

Its 60 ft long deck also allows for easy access to much ground within a short time.

Unfortunately, John Deere’s 757 model is no longer in production, which means it can be tricky to get original replacement parts… which is the least of the problems.

Here are more John Deere 757 problems, causes and solutions.

John Deere 757 Problems, Causes and Solutions

ProblemsCausesSolutions
1. Engine backfiring frequentlyFewer fuel additives resulting in overheatingUse A grade gasoline
2. Failed blade clutchExcess heat from the engineFix faulty cylinders, hoses and wires
3. Lean running conditionExcess air causing poor air-to-fuel ratio in the engineClean the mower’s engine and ensure all components are free from dirt and debris
4. Fuel delivery problemsA clogged carburetorClean your carburetor, fuel tank and fuel lines
5. Faulty pulley and beltToo greasy inner partReplace the faulty pulley and belt
6. Engine OverheatingDebris building up around the cylinder head cooling finsClean the cylinder heads and cooling fins
7. Loss of powerFaulty spark plugs and poor fuel flow to the carburetorReplace the spark plugs and ensure you have functional cylinder heads

John Deere’s lawnmowers are among A-listed mowers in the market. However, problems such as engine backfire failure, blade clutch, erratic operation are common with JD mowers, including the 757.

1. Engine Backfiring Frequently

The gasoline formula has been changing over the years. Today, manufacturers add fewer additives to fuel resulting in cases of engines overheating.

Engines end up generating excess heat—more than normal cylinders can withstand. You know what follows, right? More cases of gasoline causing engine detonation.

Solution

The solution (or preventive measure) is using A-grade gasoline. It’s better to spend more on quality gasoline than risk a detonation.

Quality fuel burns slowly, efficiently and generates less heat compared to the cheaper gasoline.

Watch what goes into your fuel tank. Go for the best grade if you want to be safe and to protect your 757 from engine problems.

2. Failed Blade Clutch

An overheating engine affects other components, e.g., blade clutch. Excess heat from an overheating engine causes the crankshaft to heat as well. You end up with a failed blade clutch.

You also expect to end up with this problem if excess heat ends up causing the hoses to stretch and wires to break. It eventually leads to blade clutch failure.

Solution

Ensure there’s no leakage in your JD 757 cylinders. Check your hoses and wires, too. You want them in perfect condition.

If they’re affected, do replace or have them replaced. Seek professional help if you’re not experienced.

3. Lean Running Condition

When we talk about an engine running lean, we mean there’s excess air—you have poor air-to-fuel ratio.

As with most engines, JD 757 requires a good balance of air and gasoline for combustion to happen properly and for the gasoline to burn efficiently.

We call this (balance) stoichiometry. If your John Deere 757 mower’s lean running happens more than often, the engine will heat.

This problem is common in mowers that have been in use for at least two years. It’s not common in new mowers.

The culprit is residual fuel that has been sitting in the engine for months on end or the dirt and debris that has accumulated in the engine.

Solution

All you need to do is clean your engine and the other components by wiping off the dirt and debris.

It’s also a good idea to clean your 757 lawnmower every once in a while—once a month is OK. That way, you’ll avoid any build up and keep your engine and parts in perfect condition.

4. Fuel Delivery Problems

If you’re experiencing unusual fuel delivery problems with your lawnmower, especially poor fuel delivery, the most likely culprit is a clogged carburetor.

And how does this happen? When you give your JD 757 more throttle, air gets forced through the venturi tube in your carburetor, resulting in excess fuel being drawn into the engine.

757 mowers with leaking hoses and fuel lines also cause abnormal fuel delivery. Clogged carburetors also cause blockage and mess up normal fuel function.

Solution

Ensure your fuel tank is in perfect condition. You also need to check for any other damages because sometimes leaking fuel problems occur in places you don’t even expect.

And finally but not least, use the carburetor cleaner to keep your carburetor clean.

If you have the same problem with other zero-turn mowers, such as John Deere Z930M, you can apply the same solution.

5. Faulty Pulley and Belt

If your John Deere 757 has seen better days, you’ve probably noticed the pulleys have become floppy. The inside part is also too greasy.

Solution

As the saying goes, a new broom sweeps clean. If you see these signs on your John Deere 757’s pulley, it’s time to replace it.

Luckily, you’ll not struggle to find a perfect replacement for the old V-shaped belts—which is what’ll work on this model. A new pair of John Deere’s new belts will also fit and work.

And, yes, if you’re on a budget, you can get great alternatives from other manufacturers—you just need to look up the best companies and then compare the prices against those of John Deere belts.

We think Kevlar belts are a suitable replacement. Be sure to check if a brand mentions “non-slip technology”, good or higher tension, and an excellent cut strength.

6. Engine Overheating

John Deere 757 engines often overheat when debris builds up around the cylinder head cooling fins.

This causes engine temperature to exceed the normal temperatures, leading to misfiring, poor performance, blown head gasket, seized engine, among other problems.

You’re likely to discover a couple of things on your lawnmower’s engine and components, including broken pistons, stuck valves, bent push rods, valve guides having moved, and such.

Solution

  • Use the engine kit to prevent debris from building up or entering the engine.
  • Follow the recommended Service Intervals in JD 757 Operator’s Manual for cleaning the engine cooling fins and removing engine shrouds. However, if your JD 757 operates under extreme conditions (dusty and high temperatures), you’ll notice signs of debris. You need to have shorter service intervals or even clean the engine fan screen after every use.
  • Inspect behind the engine and the cylinder heads to prevent debris build up.
  • Remove your mower engine valve cover to inspect.
  • Remove the cylinder head to inspect the head gasket if the valve guides and push rods are in perfect condition.
  • Clean the cylinder head mating surfaces if you notice your 757’s head gasket has failed or has carbon tracking.
  • Check the cylinder head for warping (considering the max head wrap should be .002) and replacing the head assembly plus reinstalling your 757’s shroud.
  • Install the screen kit TCA18947 if the 757’s head is damaged.

7. Loss of Power

Some users experience loss of power with their lawnmowers. One user said their 757 loses power when engaging the mower blades.

Solution

There are various solutions to this. You could start by changing the spark plugs and adjusting the gap between coils.

Another fix is checking the fuel flow to the carburetor and the floats in the carburetor. If that fails, your 757 is likely running on one cylinder.

Check your push rods by removing the valve covers on the cylinders—they might have come loose on one cylinder.

Also, check the valve guides to confirm if a guide has slipped in the head if you have a bent push rod. And, if you have a slipped guide, replace the head—it’s not fixable.

Main Points:

  • Use good grade gasoline.
  • Perform regular repairs and maintenance to keep your mower in perfect condition.
  • Use a carburetor cleaner regularly to avoid a clogged carburetor.

John Deere 757 Review

If you’re looking for a heavy duty lawnmower for a home with over two acres, John Deere 757 is a perfect choice.

This commercial grade mower has three 21-inch blades under its deck. You can achieve the beautiful golf course look because it gives a quality cut—even if you prefer cutting as low as 1.5 inches.

The 757 is powered by a 25HP Kawasaki with 675cc 2-cylinder gasoline. It has capacity for nine gallons of gasoline.

FAQs

How much does a John Deere 757 weigh?

The John Deere 757 is a medium-duty tractor. It weighs 917 kilograms (8790 kilograms).

What size deck does a John Deere 757 have and how wide is the mower deck of John Deere 757?

The 757 features a 60-inch seven gauge stamped steel deck with a cutting height of 60 inches.

Can I use regular octane gasoline in my John Deere 757?

Use any octane gasoline rating—from 87 to the premium 92. Gasoline with more additives burns slowly and prevents the engine from knocking.

How much gasoline do I need to run a John Deere 757 zero turn mower?

The 757 is a 20 horsepower, 25hp Kawasaki 675cc 2-cyl gasoline Kawasaki engine. 

Does John Deere 757 consume more fuel compared to other lawnmowers?

John Deere 757 is a powerful utility vehicle, but it’s energy efficient compared to other lawnmowers of its caliber.

What is John Deere 757’s cutting width?

JD 757 has a 60-inch mower deck that’s made of 7-gauge steel.

What is the best tire pressure for John Deere 757 zero turn mower?

The ideal tire pressure for the John Deere 757 zero-turn mower is 8 PSI (pounds per square inch).

Final Thoughts

757s are sturdy and durable—you rarely see a lot of them at the local dealer waiting for repair. Most 700 series users wish John Deere improved the series instead of discontinuing it.

Unless there’s a problem, the engine runs smoothly and remains strong for a long time. 757s leave a very nice cut, even if you prefer to mow your yard as low as a golf course.

However, it comes with its fair share of problems. Now, you know the causes and the solutions.