Question about Craftsman 20 Hp 42" Deck Lawn Tractor

1 Answer

Remove armature magneto - Craftsman 20 Hp 42" Deck Lawn Tractor

Posted by on


1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that gotĀ 5 achievements.


    An expert whose answer gotĀ voted for 20 times.


    An expert who has written 20 answers of more than 400 characters.

  • Expert
  • 108 Answers

Need to pull the flywheel off. Will more than likely need to purchase or borrow a flywheel puller to avoid damaging the crankcase.

Posted on May 14, 2010


2 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya Repairman can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Repairman (only for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

  • 51 Answers


removw chop screen and blower housing unplug little wire under mag remove 2 screws and remove mag reverse prosess with new mag but pull mag away from fly wheel and snug screws center magnet on flywheel over legs of magneto place .010 feelre guage inbetween and loosen screws, hold mag against flywheel and tighten remove feeler guage reinstall kill wire on bottom of mag install blower housing and chop screen hope tis helps

Posted on Aug 08, 2010

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

With a new armature magneto part # 591459 installed i don't get the new spark plug to fire . what am i missing ?

Check the spark plug wire and boot for continuity using a multimeter. If that isn't the issue, try reversing the polarity on the magneto wires.
Always check for a spark jump from the boot to the plug tip in near darkness, they are easier to see!

Oct 08, 2014 | Briggs & Stratton Garden

1 Answer

Electrical wire?

Because of the simplicity of the ignition system, there really is no diagram necessary. Husqvarna uses a simple two-wire harness in that unit (e.g., p/n 544 08 28-01) that has two female quick-connects at one end and one female quick-connect and a ring terminal at the other end.

The end with the ring connector is the magneto end. The female quick-connect there attaches to the magneto primary circuit control terminal, and the ring terminal there is secured under the head of one of the two magneto armature mounting screws.

The opposite end of the harness goes to the ON/OFF switch on the case side near the handle. This switch is a simple single-pole/single-throw switch that allows the engine to run when in its open position, and kills the engine when in its closed position. The engine shut-down occurs through the effective action of grounding the magneto control terminal to the magneto armature frame, as accomplished through the circuit through the ON/OFF switch when that switch is closed.

To identify the armature, harness and switch for your saw, go to the Husqvarna Manuals Download Page for your saw, identify the list by the build date of your saw, and download the desired list. (I like the 2009-02 version as it has the sections identified and bookmarked, but be sure you ID the correct parts for your saw. It might help to DL your manual as well as the 2009-02 version for reference purposes.)

The armature and harness will be found on the Ignition / Flywheel page (items 7 & 8, respectively), and the switch will be found on the Air Filter / Intake / Carb and Air Purge / On-Off Switch pages, as item 9 (e.g., p/n 504 00 34-01, includes retainer bail).

If you are getting no spark from the plug wire when cranking the engine with the ON/OFF switch in its ON position, the problem must be in one of three places -- the magneto or its mounting, the harness, or the switch. A short between the magneto control terminal and the magneto armature will kill the spark, as will any short between the two wires in the harness. Similarly, an ON/OFF switch that fails to open (internally) will have the same effect as leaving the switch set to its OFF position.

If the engine will not stop when the ON/OFF switch is moved to its OFF position, an open magneto circuit is indicated. This can be due to a broken wire in the harness, a loose or corroded connection of the grounding (control) wire to the armature frame, a break in the magneto primary circuit to the control terminal, a loose or disconnected wire at the ON/OFF switch, or an ON/OFF switch that fails to close (internally).

While broken or shorted harness wires are easily repaired without replacement, any magneto or switch failures will usually require replacement of the failed component.

Jul 21, 2012 | Husqvarna 450 e-series 18" Chain Saw

1 Answer

Is there a hot wire that goes to the armature on a 18.5 2 cly b&s engine

did you replace the armature or the magneto?the magneto has the plug wires on it the armature charges the battery if you put on a new magneto annd you have no spark check the safety switches

Apr 12, 2012 | Garden

1 Answer

Oegn.comThe 675 has become increasingly difficult to start, till today when it appears to be getting no spark (I don't see a spark, but it does shock me when i hold on to spark plug and pull cork). Is...

The magneto is self contained and the primary winding is grounded via the throttle stop, flywheel brake, or the low oil level sensor to ground the magneto enough to stop the spark from jumping the spark plug gap.
First check the oil level and make sure it is fully serviced.
Second check the Flywheel brake switch to see of the cable needs re-adjusted or replaced. There is a lever on the brake actuator that makes a ground on the primary of the magneto. ANY gound on the wire that goes from the flywheel brake, the throttle control (if so equipped) or the low oil level sensor will stop the engine from having spark. There is no condensor. The magneto is excited by the magnet in the armature each rotation of the fly wheel. Grounding of the magneto primary rreduces / stops the function of the magneto high voltage output.

You need to find out what is grounding the magneto primary when the engine should be in a running state.

Thanks for choosing FixYa,

Jul 17, 2011 | Craftsman 675 Series 190cc 22" Briggs ...

1 Answer

How to install a ARMATURE-MAGNETO on a BRIGGS &STRATTON 18 H. ENGINE? Is there a certain gap between the fly wheel and the armature-magneto?

removw chop screen and blower housing unplug little wire under mag remove 2 screws and remove mag reverse prosess with new mag but pull mag away from fly wheel and snug screws center magnet on flywheel over legs of magneto place .010 feelre guage inbetween and loosen screws, hold mag against flywheel and tighten remove feeler guage reinstall kill wire on bottom of mag install blower housing and chop screen hope tis helps

Aug 07, 2010 | Craftsman 42 in. Deck 19.5hp Lawn Tractor

1 Answer

Engine only running on one side

You didn't indicate what type of motor or tractor. If you only have spark on one cylinder and if it's a newer engine with electronic ignition, I would suspect the magneto armature. If it's older with points, then it could be the points. Points are under the flywheel, the magneto is next to the flywheel, follow the sparkplug wire. Measure the gap between magneto and flywheel before removing. When buying the magento, be sure to get the model number and brand from the motor.

Jul 23, 2010 | Garden

1 Answer

I have a Briggs & Stratton Sovereign 375 engine model no 1OD902 type 0129B1 code 03012751. No spark at all - any ideas please. Had the flywheel off - that's as far as I got. Bob

Bob, if you have the flywheel back on, first check the air gap between the magneto (ignition armature) at the magnets on the flywheel (a common business card works well for this) then unplug the small wire from the magneto and check for spark, if you have spark, repair the kill switch and/or wire, if NO spark, replace the magneto.
If you remove the spark plug, you can hand spin the flywheel fast enough to ascertain spark

Oct 11, 2009 | Garden

1 Answer

Installing Amature-Magneto

The air gap for the magneto is .010 - ,014. A microfiche card, an index card, a common business card or anything NON-magnetic of the above thickness makes a good shim to achieve this gap.

  1. Remove the old ignition armature mounting screws. Then, disconnect the stop switch wire from the flywheel brake and remove the armature.
  2. Attach a replacement armature from the original engine manufacturer, using mounting screws. Then, push the armature away from the flywheel and tighten one screw.
  3. Turn the flywheel so the magnets are on the opposite side from the ignition armature.
  4. Place the appropriate shim between the rim of the flywheel and the ignition armature. While holding the shim, turn the flywheel until the magnets are directly adjacent to the armature.
  5. Loosen the tight screw so the magnets pull the ignition armature against the flywheel and shim. Then, tighten both mounting screws and rotate the flywheel until the shim slips free.

Sep 21, 2009 | Craftsman Garden

Not finding what you are looking for?
Craftsman 20 Hp 42" Deck Lawn Tractor Logo

Related Topics:

159 people viewed this question

Ask a Question

Usually answered in minutes!

Top Craftsman Garden Experts

Wade Mobley
Wade Mobley

Level 3 Expert

489 Answers

Dean Gruber

Level 2 Expert

110 Answers

Roland W VanLue
Roland W VanLue

Level 3 Expert

486 Answers

Are you a Craftsman Garden Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides