March 1, 2013

How to replace a log splitter carburetor

By Lyle Weischwill
How to replace a log splitter carburetor

This DIY repair guide gives instructions on how to replace a log splitter carburetor. The carburetor mixes air and fuel into a combustible mixture that ignites in the cylinder to power the engine. If the engine won’t start and the tank is full of fresh fuel, remove the air filter and pour about a teaspoon of fuel into the carburetor. If the engine starts and then quickly dies when you pull the starter rope, or if gas pours out of the carburetor, the problem is most likely the carburetor. Replace the carburetor with the manufacturer-approved replacement part.

Follow the steps in this repair guide to replace carburetor on Craftsman and MTD log splitters.

Quick links
Tools required
Phillips screwdriver
Wrench set
Needle-nose pliers
Gas can (to hold fuel drained from the fuel tank)
Work gloves
Repair difficulty
Time required
30 minutes or less
Repair difficulty
Time required
30 minutes or less

Instructions

  1. 01.

    Disconnect the spark plug wire

    Disconnect the spark plug wire so there's no chance that the log splitter engine could accidentally start.

    Disconnect the spark plug wire.

    Disconnect the spark plug wire.

  2. 02.

    Drain the fuel tank

    Release the spring clamp that secures the fuel supply line to the fuel tank.

    Disconnect the fuel supply line from the fuel tank and drain the fuel from the fuel tank into an approved container.

    Drain the fuel from the fuel tank.

    Drain the fuel from the fuel tank.

  3. 03.

    Remove the air filter cover and air filter

    Press the release tab on the air filter cover and lift the cover off of the engine.

    Pull the air filter straight up and off the top of the silencer plate.

    Tip: Clean the filter’s foam element if it’s dirty, following the directions in the owner's manual. Replace the filter elements if damaged.
    Remove the air filter cover.

    Remove the air filter cover.

    Pull the air filter off.

    Pull the air filter off.

  4. 04.

    Remove the silencer plate

    Remove the two Phillips head screws securing the silencer plate to the top of the carburetor and remove the silencer plate.

    Remove the silencer plate screws.

    Remove the silencer plate screws.

    Remove the silencer plate.

    Remove the silencer plate.

  5. 05.

    Remove the carburetor

    Remove the two 10mm cap nuts that secure the air cleaner housing and the carburetor to the carburetor mounting studs.

    Remove the 10mm mounting bolt from the top of the air cleaner housing.

    Disconnect the vent hose from the valve cover.

    Pull the air cleaner housing off of the carburetor.

    Note the configuration of the carburetor throttle linkage and governor spring before removing them.

    Manually pivot the throttle to align the slot at the top of the throttle with the throttle linkage rod. Pull the throttle linkage rod up out of the slot on the top of the throttle.

    Disconnect the governor spring from the throttle on the carburetor.

    Pull the carburetor off of the carburetor mounting studs.

    Release the spring clamp that secures the fuel supply line to the carburetor and pull the fuel supply line off the carburetor.

    Remove the air filter housing mounting cap nuts.

    Remove the air filter housing mounting cap nuts.

    Remove the top bolt.

    Remove the top bolt.

    Disconnect the vent hose from the valve cover.

    Disconnect the vent hose from the valve cover.

    Remove the air filter housing.

    Remove the air filter housing.

    Disconnect the throttle linkage.

    Disconnect the throttle linkage.

    Disconnect the governor spring.

    Disconnect the governor spring.

    Pull the carburetor off of the mounting studs.

    Pull the carburetor off of the mounting studs.

    Disconnect the fuel line.

    Disconnect the fuel line.

  6. 06.

    Install the new carburetor

    Connect the fuel supply line to the new carburetor and secure the fuel supply line with the spring clamp.

    Clean gasket residue off the side of the engine so that the new carburetor gasket can seal properly.

    Position the new carburetor gasket on the mounting studs against the side of the engine.

    Slide the new carburetor onto the mounting studs and push the carburetor against the engine.

    Reconnect the governor spring and the throttle linkage on the carburetor throttle.

    Position the gasket plate on the mounting studs and slide the gasket plate against the carburetor body.

    Reinstall the air cleaner housing on the mounting studs and connect the vent hose on the valve cover. 

    Reinstall the 10-mm cap nuts on the ends of the mounting studs and tighten the cap nuts firmly.

    Reinstall the 10-mm mounting bolt on the top of the air cleaner housing and tighten the mounting bolt firmly.

    Connect the fuel line to the new carburetor.

    Connect the fuel line to the new carburetor.

    Slide the new carburetor onto the mounting studs.

    Slide the new carburetor onto the mounting studs.

    Reconnect the governor spring.

    Reconnect the governor spring.

    Reconnect the throttle linkage.

    Reconnect the throttle linkage.

    Reinstall the air filter housing.

    Reinstall the air filter housing.

    Reconnect the valve cover vent hose.

    Reconnect the valve cover vent hose.

    Reinstall the cap nuts.

    Reinstall the cap nuts.

    Reinstall the top mounting bolt.

    Reinstall the top mounting bolt.

  7. 07.

    Reinstall the silencer plate

    Reinstall the silencer plate on the top of the carburetor and secure the silencer plate with the screws.

    Reinstall the silencer plate.

    Reinstall the silencer plate.

    Reinstall the silencer plate mounting screws.

    Reinstall the silencer plate mounting screws.

  8. 08.

    Reinstall the air filter and cover

    Push the air filter into place on top of the silencer plate.

    Reinstall the air filter cover.

    Reinstall the air filter.

    Reinstall the air filter.

    Reinstall the air filter cover.

    Reinstall the air filter cover.

  9. 09.

    Reconnect the fuel line to the gas tank

    Reconnect the fuel supply line to the gas tank and secure it with the spring clamp.

  10. 10.

    Fill gas tank with fuel

    Fill the gas tank with fuel and check for leaks.

  11. 11.

    Reconnect the spark plug wire

    Connect the spark plug wire and test engine operation.

    Reconnect the spark plug.

    Reconnect the spark plug.

Warning: Undertaking repairs to appliances can be hazardous. Use the proper tools and safety equipment noted in the guide and follow all instructions. Do not proceed until you are confident that you understand all of the steps and are capable of completing the repair. Some repairs should only be performed by a qualified technician.

Symptoms common to all log splitters

Choose a symptom to see related log splitter repairs.

Main causes: broken pump coupler, clogged hydraulic fluid filter, bad hydraulic control valve, broken hydraulic pump, bad hydraulic cylinder
Main cause: worn hydraulic valve seals around the actuator rod
Main cause: worn hydraulic pump seals
Main causes: dirty carburetor, stale fuel, bad spark plug, broken recoil starter
Main cause: worn hydraulic cylinder seals
Main causes: leaky head gasket, damaged sump gasket, leaky oil drain plug, damaged fuel line, bad carburetor seals
Main causes: dirty carburetor, bad spark plug, clogged air filter, stale fuel

Repair guides common to all log splitters

These step-by-step repair guides will help you safely fix what’s broken on your log splitter.

How to replace a log splitter flexible pump coupler

The flexible nylon pump coupler deteriorates over time. Replace the flexible pump coupler if it begins to vibrate or rattles, which are early indications that it’s failing.

Repair difficulty
Time required
 30 minutes or less
March 1, 2013
By Lyle Weischwill
How to replace a log splitter carburetor

The carburetor mixes air and gas before the fuel mix goes to the engine. If the engine won't start and the spark plug is getting spark, the carburetor is likely the problem.

Repair difficulty
Time required
 30 minutes or less
March 1, 2013
By Lyle Weischwill
How to replace a log splitter recoil starter

The recoil starter spins the engine on the log splitter when you pull the starter rope, and the rope retracts when released. If the recoil starter assembly is broken, follow the steps in this repair guide to replace it.

Repair difficulty
Time required
 15 minutes or less

Articles and videos common to all log splitters

Use the advice and tips in these articles to get the most out of your log splitter.

November 1, 2015

How to maintain the hydraulic system in a log splitter

By Sears PartsDirect staff

See how to properly maintain the hydraulic system in your log splitter.

June 1, 2015

Log splitter common questions

By Sears PartsDirect staff

Learn more about your log splitter with these frequently asked questions.

June 1, 2015

How to change the hydraulic fluid in a log splitter

By Sears PartsDirect staff

Learn how to change the hydraulic fluid in your log splitter.