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Push and Self-Propelled Lawn Mower Repair

Push Lawn Mower Keeps Breaking Pull Rope

If your pull cord rope keeps breaking, it can be a couple things that need checked out.

First, are you using good quality pull rope each time you replace it? There are some very basic white ropes that do not have a lot of strength and will break quickly. A braided rope that is heavier duty will hold up much longer and suit your lawn mower application quite well.

Another problem that is typical is that your pull starter rope guides have developed a sharp spot or the blower cover itself has a sharp piece of plastic that is cutting the rope. Carefully check the guides for any sharp edge. Remove the blower or starter from the mower and check the starter rope guide for nicks or sharp edges both on the outside and the inside.

Smooth out any edge you find with some emery cloth or sand paper and form a nice smooth edge for the pull rope to pull through.

If your knot keeps breaking at the pull cord handle, you can either double knot it or also place a small washer in the handle and pull the rope through it. The washer serves as a support for a hole that may be enlarged by the pull rope. Tie a double knot in the rope and it should be good to go!

Lawn Mower Repair Tips, Push and Self-Propelled Lawn Mower Repair

Lawn Mower Hit Something and Now Won’t Start

A “blade strike” as it is called can do some damage to the lawn mower, but engineers have built in some safety features that help contain that damage.

What happens during most blade strikes is when the blade contacts a rock or root, the impact causes the blade to stop and a shear key located on top of the engine to shear either partially or fully. This causes the ignition timing to fire incorrectly.

The result could be that the pull cord wants to rip out of your hand on a push or self-propelled lawn mower. If you are lucky, you will not injure your hand or shoulder!

The only way to tell if the flywheel key has been sheared is to remove the flywheel cover and in most cases, the flywheel as well. Then you can see if the square key has been partially sheared or is fully sheared.

Replacing the sheared flywheel is solves this problem. It must be the factory key as it is made of a material that will shear away and not solid steel that will damage parts if you hit something else.

If you need a professional lawn mower repair shop to troubleshoot and correct this problem, visit our Locations page for help.

Lawn Mower Repair Tips

My Lawn Mower Slowly Loses Power and Then Dies

You are just mowing along as usual and your lawn mower will slowly lose power and then it will just shut off. This is not an instant shut down, it happens over a minute or so.

In many cases this is a simple fix and to test what the problem is, loosen the gas cap a little and if you hear air rushing in as you do, it probably means that your gas cap is not venting properly. A gas cap is supposed to let air into the gas tank but not let it escape.

Now start your lawn mower and see if it runs for a long time. If it does, you have a bad gas cap. If you still have the same problem, you need to check your fuel filter and down the line to the carburetor. Check the fuel filter by pinching off the fuel line and removing it from the carburetor. Then release the pinched hose and let it drain into a clear glass container. If the fuel doesn’t come out of the hose with any quantity, you most likely found the problem. If the flow is good, move onto the carburetor. It will need to be taken apart and cleaned of any debris or ethanol intrusion.

Still need help with your lawn mower? Visit our Locations page for a lawn mower repair shop near you.

Riding Lawn Mower Repair

What Does a Riding Lawn Mower Tune-up Consist Of?

So your lawn mower needs a tune-up and you are wonder what they actually should do during that preventive maintenance.

Here is a checklist that I use to ensure my clients get their riding lawn mower serviced properly.

If you need a riding lawn mower shop in your area, check out our Locations page for a shop near you.

Riding Lawn Mower Tune-Up Checklist

  • Document Model Code and Serial Number – Look For Service Bulletins
  • Clean Mower With Leaf Blower Under Hood, Deck, Chassis & Transmission
  • Start Engine – Warm Up – Check Spark – Check All Functions of Mower & Test Drive
  • Test Safety Switches – Brake Test
  • Test Charging System While Running & Battery After Shutdown
  • Change Oil and Filter
  • Check Compression L______R______
  • Remove Hood & Put Rider on Lift
  • Change Air Filter, Fuel Filter & Spark Plugs
  • Clean and Coat Battery Terminals
  • Remove Blower Cover and Clean & Degrease Engine
  • Clean Carburetor if Necessary
  • Inspect Engine for Damage, Wear or Missing Parts
  • Grease Fittings in Steering, Wheels, Axles, Chassis & Deck Spindles
  • Check Front Wheel Bearings & Steering Support Inserts
  • Inspect Electrical, Mechanical and Control Cable Systems
  • Inspect Fuel and Vapor Lines to Tank & Gas Cap
  • Inspect Deck and Drive Belts – Brake Pad
  • Inspect Drive Spindles for Binding or Bearing Wear
  • Inspect Deck Pulley’s and System Parts
  • Lubricate Mechanical Linkages & Control Cables with Dry Lube
  • Remove Blades and Sharpen – Scrape Deck – Install Blades -Torque to Specs
  • Inspect Transmission Oil Level & Cooling Fan ÿ Transmission Mount Brackets
  • Fill Tires With Air – Normally 18psi Front and 10psi Rear
  • Check Tires for Wear & Damage – Check Scalp Wheels for Wear & Damage
  • Level Deck if Necessary

 

Lawn Mower Repair Tips

Lawn Mower Engine Sputters

What is causing that aggravating sputtering sound from your lawn mower? Well, it depends on what kind of sound it is. If it is an intermittent sound and the lawn mower is losing power, you may very well have water in your gasoline.

Water in gas is a big problem today because of the ethanol that is added to it. Ethanol is essentially alcohol and alcohol attracts moisture from the air through an open vent cap or unsealed gas can.

When the engine is running, it will try to burn this water and will begin to sputter and especially under higher loads such as thicker grass. The sputtering may clear up or it may get worse. Alcohol is heavier than gasoline so it tends to sink to the bottom of the gas tank and the carburetor bowl. As the mower is cruising along, the water and gas will splash around and you may get some water sucked up into the carburetor or it may be a splash of gas.

What I like to do in this case is to shutoff the fuel and then pull the fuel line off the carburetor and get a fuel sample with a clear glass jar. If there is water in the gas tank, there will be water in the fuel system and that will need to be cleaned out.

If you need a lawn mower repair shop in your area, visit our Locations page.

Lawn Mower Repair Tips, Push and Self-Propelled Lawn Mower Repair, Riding Lawn Mower Repair, Zero Turn Lawn Mower Repair

Lawn Mower Leaks Oil From Crankcase

Occasionally we see an oil leak from the crankcase gasket that seals the two halves of the crankcase together. Or a pinhole develops in the actual casting of the crankcase and oil will seep out of it. Other areas that leak are protrusions through the crankcase such as the governor arm shaft. Head gaskets can be another source of an oil leak out of the crankcase. An oil seal at the crankshaft is another oil leak source.

Note: Be extra cautious during the testing as you are working near a lawn mower blade. You can shutdown the engine prior to checking for where the engine is leaking for safety.

There are some dyes that can be added to the oil to find a hard to find oil leak. You put the dye in the crankcase and run the engine to get it warmed up. Then a black light is used to identify where the oil leak is coming from.

If you don’t have access to this type of testing paraphernalia, thoroughly clean the engine crankcases and then run the engine until it is warm. Look over the areas that you suspect the leak is coming from and look for the slightest weeping of oil. Wipe the area down and continue to monitor it.  Some leaks are difficult to find, but you will eventually find them.

Lawn Mower Repair Tips, Push and Self-Propelled Lawn Mower Repair

Why a Honda Lawn Mower is Better Mower?

When you buy practically anything with the Honda name on it, you are getting a quality product. Whether it is a lawn mower or a car, Honda just puts the engineering and the quality into everything they make. Yes, you are going to pay a little more for Honda products, but as the old saying goes “You get what you pay for” still rings true.

The Honda lawn mower engine is very dependable and with routine care, it will last for a long time. Parts are readily available for new and older Honda mowers, so you can keep them going long after that other brand wears out.

The drivetrain is built solid to take a beating. Sometimes drive axles can be a problem with freezing up, but this is a problem that can be resolved without much expense.

The decks are made of good steel and are not thinly made. If they are kept free of wet grass, they will last a long time.

The controls are fairly easy to navigate and are user friendly. Some are quite different than what you are used to on a self-propelled lawn mower, but you get used to them pretty quickly.

I am a Small Engine Mechanic by trade and if I were to need another lawn mower, it would certainly be a Honda.

Lawn Mower Repair Tips

Lawn Mower Engine Surges up and Down

Do you ever wonder why your lawn mower engine revs up and down? The annoying sound that also affects the power your lawn mower puts out is caused by a fuel delivery or vacuum leak issue.

The engine gets enough fuel and then it doesn’t and so on and so forth. After a while the mower will develop a more serious engine problem and may begin to hard start or not even start at all. The surging could also become worse and the swings between high and low will get longer in duration.

This is a problem that is best suited for a lawn mower engine specialist to check out. Our Locations page has a listing of lawn mower repair shops in your area to help resolve this problem for you.

You can check the easy things such as slightly cracking the gas cap to see if the surging stops or change or clean the fuel filter if it has one. Some fuel filters are in the tank and not easy to see. You may have to drain the tank and then flush it out.

The other items are the carburetor and gaskets. Fuel lines can be the culprit too. Systematically check these items for blockage and air leaks to find the cause of the problem.

Lawn Mower Repair Tips, Push and Self-Propelled Lawn Mower Repair

Push Lawn Mower Blade Hitting Deck and Making Noise

Occasionally you will hit something hard enough to bend the deck or the blade. With such thin metal decks today, they are easily bent. If your deck is rusting, parts can come loose and hit the blade as well. Some decks have guards inside of them that are spot welded together and when those welds come loose, the guard will hit the mower blade and you will hear quite the racket!

To inspect this area, pull the spark plug boot off the spark plug and then raise the mower deck from the front. It is not a good idea to lean the mower over side to side as this can cause the oil to leak out of the carburetor through the air cleaner.

Look for anything that is loose or for the blade that is bent. Slowly rotate the blade to see if it hits anything and you will likely find the cause of this problem pretty quick. Either the blade will need to be replaced or the deck metal repaired. You should also check to see if the crankshaft is bent while you are slowly turning the blade as this can cause the problem as well.

If you need a lawn mower repair shop to check out this problem for you, visit our Locations page for help finding a small engine shop in your area.

Lawn Mower Repair Tips

My Lawn Mower is Leaking Gas From the Carburetor

If the gas is leaking directly from the throat of the carburetor, that can be a sign of a needle and seat not properly sealing. Over time, contaminants will build up on those components and cause them to leak. A complete carburetor overhaul is usually the cure for this problem.

If gas is leaking from another part of the carburetor such as the float bowl, it could be a loose bowl nut or a bad gasket on that nut. The O-ring that seals the bowl to the carburetor could also be bad. Replace these parts and be careful to clean the grooves that hold the O-ring in place as buildup of dried fuel can cause that to leak as well.

If fuel is leaking from another part of the carburetor such as a jet screw,  it is time to replace the carb with a new one. Make sure to order new gaskets when you replace the carburetor to ensure there will not be any air leaks. An air leak will cause the lawn mower engine to surge and run lean. This means it has more air than fuel.

Fuel leaks can be dangerous and lead to an engine fire. Take them seriously and if you need a lawn mower repair shop to assist with your problem, visit our Locations page for help.