Husqvarna Garden - Recent Questions, Troubleshooting & Support

Given your detailed description, most likely the PTO switch. When it fails, turn PTO OFF and then try a firm twist and hold of the PTO switch CW or CCW and see if engine will start/run. If yes, then bad PTO switch. If no, could still be PTO switch. I don't remember if the switch pops out or if you have to remove the panel, but you need to get a visual of the switch and harness connector and see if there are signs of heat damage. Melted deformed plastic, wire insulation, etc.

Less likely is the anti-backfire solenoid. You can take the solenoid out and remove the plunger or plunger end, put solenoid back in. Then run for test. It will run fine without the plunger, but may backfire when shutdown. One other caveat if the engine kill shunt somehow has a fault and engine kill has been working by the anti-fire solenoid, removing the plunger means you wont be able to turn engine off. Just remove battery NEG cable should this happen.

I don't believe its the ignition modules as there are two and it would continue to run on one and not likely both are failing.
Could be other causes but PTO switch is first suspect to eliminate.

Husqvarna Garden | Answered on Mar 17, 2019

Here is a site that tells the history of the chainsaw. It does not give serial numbers, only model numbers.

Husqvarna Garden | Answered on Mar 16, 2019

Contact Husqvarna directly to inquire.

Husqvarna Garden | Answered on Mar 15, 2019

If not in bypass, likely you lost the pump drive belt, item 5 in following diagram.

Husqvarna Rz4623... | Answered on Mar 10, 2019

yth18542 is the model number of the lawn tractor, the identification plate should also show a serial number, which can be used to identify the date of manufacture as well as to differentiate between differences in this model, depending on date of manufacture.

Husqvarna Garden | Answered on Mar 05, 2019

Sounds like the bar to the choke has come out you need if possible to see the set up then it is easy has your mate got one?

Husqvarna Garden | Answered on Mar 04, 2019

You must check the manual... Do you have access to it? we maybe could help you locate it.
good luck

Husqvarna Garden | Answered on Mar 02, 2019

The new blade is likely coincidental, reinstall old blade and likely it will exhibit same hard to start. More likely its in need of service and my experience with these is they are difficult, even for the "professional".

You could try setting the idle speed a little higher and increase low speed mix (ccw) and see if that helps. If you don't use a fuel antioxidant, you should... always.

Husqvarna Garden | Answered on Mar 01, 2019

The spark plug could be fouled. Take it out and clean it.

Husqvarna Garden | Answered on Feb 28, 2019

Request from Husqvarna.

Husqvarna Garden | Answered on Feb 26, 2019

If you do not have a manual, go to this web site

I FOUND THIS WEB SITE that I think will help you with this question and a lot more. Since this web site will have access to many different vehicles I hope you do not feel like I am lazy by just passing along the web site instead of giving you the exact information you asked for.

Go to this site to find a manual to help you.

Husqvarna Garden | Answered on Feb 22, 2019

Find the air fuel mixture screw on the carb and adjust it counter clockwise to fatten the fuel mixture.

Husqvarna Garden | Answered on Feb 21, 2019

There were two different ignition units on the 435 so it is important to fit the correct unit or the timing will be out, from memory the part no. was on the unit itself, the only other way to tell is to remove the flywheel the part no of the flywheel will be stamped into the back, you then need to go to the parts list, find the relevant list that shows that particular flywheel and take the ignition unit no from that list

Husqvarna Garden | Answered on Feb 18, 2019

most saws start with "L" and "H" turned out about 1 full turn from bottomed out. See if that will get you close enough to have it run. Count in the turns as you do this so you can , at least, put it back to where it is now.

Husqvarna Garden | Answered on Feb 08, 2019

Is there 12.5V on the battery? Is battery terminals clean? Can you ump out the starter relay to troubleshoot that relay?

Husqvarna Garden | Answered on Feb 08, 2019

Not finding what you are looking for?
Husqvarna Logo

9,689 questions posted

Ask a Question

Usually answered in minutes!

Popular Products

Top Husqvarna Garden Experts

Jim Parker
Jim Parker

Level 3 Expert

1041 Answers

J. Bradshaw

Level 2 Expert

121 Answers

Jay Finke
Jay Finke

Level 3 Expert

1389 Answers

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

Answer questions

Manuals & User Guides