T435

[stihltech]

To all the Husqvarna techs on here.
I seem to have gained a tree service with quite a few T435 Husqvarna saws. The complaint is they will not idle long if set down. They are not complaining about power in the cut.
Hope to get into diagnosis next week. Anything pretty common on this model?
They tried a compression test using a tester with a long hose and got 95 psi. By the handle test it holds. Spins over nicely.
Their maintenance person says Husqvarna told them they all need top ends (15 of them). I don't buy it.
I will know when I pull the muffler.

 

[Coralillo Lo Pro]

To all the Husqvarna techs on here.
I seem to have gained a tree service with quite a few T435 Husqvarna saws. The complaint is they will not idle long if set down. They are not complaining about power in the cut.
Hope to get into diagnosis next week. Anything pretty common on this model?
They tried a compression test using a tester with a long hose and got 95 psi. By the handle test it holds. Spins over nicely.
Their maintenance person says Husqvarna told them they all need top ends (15 of them). I don't buy it.
I will know when I pull the muffler.

Seems that intake boot problems are one of the most common issues with that saw. Sometimes the boot is pulled in some away from the carb face, or torn at the flange. One mechanic said it wasn't really a Husky design flaw so much as it was user-caused a lot of the time, guys yanking on the saw when it gets pinched. Not uncommon in tree service work. One good yank and they can tear the boot. Be interesting to see what you find.

 

[stihltech]

Thanks for the info. Will definitely check it out.

 

[Robin Wood]

They got few design issue

Apparently the strato design and carb model doesn't go well together, seems like during idle it spits fuel out and gets recycled back in making it slowly rich out and die when idle is set long enough.

Using non resistor wrong plug makes it worse, not removing spark screen makes it worse

 

[cscltd]

I really don’t know what it is with husky and top handle saws, they cannot make one that works imo. And they have tried many times!! Other models are generally ok minus the 235, 240 saws
335xpt, 338xpt, 334, t435, plus some other models (Europe) and what version are they on with t540? 3?
Maybe the TML (frontier) made 35 was better-lol
I cringe when a Husqvarna top handle comes in the

 

[Tomos770]

They got few design issue
.
Using non resistor wrong plug makes it worse, not removing spark screen makes it worse

My first step would be MM.....

 

[stihltech]

My first step would be MM.....

MM?

 

[Robin Wood]

My first step would be MM.....

Not even a question, right off the bat
Pull carb limiter while you're at it
I sold my fleet of t435 and got 2511t and never looked back

 

[lone wolf]

MM?

Muffler mod.

 

[stihltech]

I don't mod as a rule. Besides I may be doing 15 for this tree service. Just running correctly will be the ticket.
Unless it is an 026 pro with low adjustment only. Muffler mod is the cure.

 

[stihltech]

First a correction. T540 XP 2 is the model. That's what I get for not taking a pic before I go home.
Carburetor leaking at needle. Vacuum and pressure test OK.
Some wear on piston skirt. Machine marks on top half. New carb and piston called for BUT, price wise over half the price of a new unit when done. And no, there will be no aftermarket here.
Waiting to hear what they want to do. It is a 2017 saw.

 

[stihltech]

So survey says- put it back together and try a new inlet needle only. Can't hurt. Can't replace the carb without a program from Husqvarna anyways.

 

[Coralillo Lo Pro]

So survey says- put it back together and try a new inlet needle only. Can't hurt. Can't replace the carb without a program from Husqvarna anyways.

That seemed like it would have been your home solution, didn't know at work if you had all or nothing OEM replacement protocols you had to follow.

 

[stihltech]

I am pretty flexible at work. This being a new commercial account, I will work with them.
So today I tried the new inlet needle. No leak at the needle. BUT, the pump side gasket leaks like a sieve. Gasket looks good too.
It may be a few days before I get back to it. It looks like a K2 AT kit.
Seems odd the way it is leaking. Any experience with a possible pump cover warpage?

 

[Chevboy0167]

I have ran into some carbs with warping and the more common to me, rough casting edges or burrs that don't allow a flat surface for proper sealing.

I keep a small pocket knife stone in the toolbox to chamfer the edges down on all the body pieces. Usually does the trick.

 

[stihltech]

Today's update: tried new gasket and diaphragm on pump side. Better, but still a leak.
Went back to old days, work grease into the gasket (not diaphragm). Not slobbering it on, working it in to help seal (old racer and mechanic tip).
No more leak. Will it hold? Time will tell. Will get some gas through it to see if it stays.
To those laughing a ready with the tomatoes, this has worked many times on the 041/051/075 intake gaskets.

 

[Coralillo Lo Pro]

Just was given a 338xpt. Rotted fuel line to primer bulb only thing stopping it from running. Won’t idle though. Imagine it needs a good carb cleaning. Been sitting forever,

 

[hotshot]

I always use 2 cycle oil on the paper kit gaskets, blue Stihl HP of course.

They seal better & are less likely to stick & tear off in the future.

 

[Lightning Performance]

A film of RTV is the best solution I've found long term with pot metal issues.

 

[stihltech]

Gasket still leaking, but 75% less. Tried to order a new pump side cover from Husqvarna- NLA. Dealer was very surprised. Did order the OEM gaskets for the carb. And so it continues....