OutdoorKing Repair Forum Forums Repairs and Maintenance Questions on Walk Behind Lawn Mower Frames Victa Lawn Mower Frames special tools

Hey all. yesterday i got a special tool for undoing parts on my stihl whipper snipper. i need to now work on my dads power torque lawnmower at some point to change the bearings. i am looking in my manual and it says you need to special tools to undo the crankpin. where can you get these tools?

cheers

The crank tools come in two flavors 1.Four pins 2.Two flat sides.
(You could also use a punch .not the best way) Or ask your local dealer to undo it

One thing I have always wondered is how do you get the blade boss off a powertorque motor so I can take the flywheel off?

take two ball pein hammers and using the ball hit opposite side of the boss at the same time.The boss is tapered .Though they can be very difficult to remove.

I can get the tool in if you require it but they are not cheap as they fit onto an air gun as well socket wrench.

I agree with mowerman on the removal if you don't want to take the engine off but if the engine is off you can rest the boss on an anvil and the belt the crap out of it until it comes off (same procedure as two hammers but have more control). Usually no damage to the flywheel.

Hope that this helps.

Hi Bruce, belting the crap out of something on an anvil doesn't sound like good workshop practise......surely there must be a tool designed to get it off without the risk of damage to the flywheel? Or, is it a design fault?

What I really meant Darryl was to hit it hard as it is on a tapper.

okay thanks guys. bruce what sort of price are you talking about? and what would be the postage?

I wold be very careful bashing the crap out of it on an anvil cause you will break the flywheel(have done it myself)There is no tool for removal .A taper works great its not a design fault as its used on lots of things.

Mowerman,

I have never broken a flywheel by hitting it on an anvil but have broken one or two using two hammers as all you need is one bad stroke and it is broken the flywheel.

I have broken the flywheel when trying to get it off after removing the boss as sometimes the alloy tends to partly weld itself to the shaft.

whats a boss guys.

jam2727,

The boss the the piece holds the blade plate onto the crankshaft.

couldn't you just use a 3 or 2 jaw puller for this?

victa,

I have only been repairing these type of mowers for about 40 years and I have never used a puller to remove the boss on a Victa. The Victa boss is usually on a taper unless it is a 4 stroke engine mounted on the frame.

If you get it off with the puller let me know as I would like to know the brand that you use.

sorry just assumed you could use a puller. Is it because it's tapered that you cant use one? I haven't dealt with a tapered boss before.

Thanks

Maybe you could use a puller but Generally for a tapered joint of any tybe jolting it from opposite sides is the best way to "break the joint" same goes on things like a cars tierod ends.

I was taught that you need to combine two things: an axial force, and an impact which might be either lateral or longitudinal. I've removed car tie rod ends with two hammers, but it took a while. Using a tie rod end remover is quicker and gentler: you use the remover to apply an axial force, then smack either the end of the remover (axial force) or the two opposite sides of the tie rod simultaneously (lateral force). I've used wedges to achieve the same outcome: load it with the wedge, then smack the end of the tie rod end thread.

I once had a real problem removing the rear hub from a car: it was on a taper, with a key, and was a good size since it was on a car. I tried a big puller, applying a massive force with no effect on anything. My father wandered by and told me I needed an impact to supplement the axial force from the puller. I took a three pound hammer and gave the end of the puller screw one medium-sized thump. Puller and hub flew across the yard and hit the wooden fence about 8 feet away with a massive impact. Works for me. Hint: don't expect a puller alone to work: you need the impact as well.

Thanks for the informative post, you learn something new everyday

Hi all,
To get the boss of a Victa 2 stroke including powertorque I have always heated the boss, then locked the boss in a vice and hit it with a hammer until the engine slipped free!
Always worked a treat for me wit no residual damage
Regards jay

Hi Jay, this seem to be good advice as I've seen this method used, with no disasterous results, providing it is done with care, obviously!!

The only thing that you have to be careful with is not to damage the seal (as it is rubber) and if heated too much you will have issues with air leaks.

But then again change the seals while its apart and buy some insurance for the machines lifespan

Yes Joe I agree with you that if you heat up the boss you should replace the seal.

Hi all,
I do agree that you need to be careful about the seals, but I only ever heat engine parts with a kero blow torch anyway to avoid damage (they don�t get all that hot!). I personally have only really removed the boss to replace the seals or dismantle the lower end-witch I usually replace the seal anyway.
Does anyone have any idea of the working temp of there seal as I would assume it would be pretty high anyway.
Thanks for your help
Regards jay

Jay,

That's a good question about the working temp of the seal and maybe someone has the answer. If I get a chance I will check with my supplier and see if they can put some light onto the matter.

I normally use OXY acetylene to heat stuff as a last resort and when you use that you need to replace seals because of the extreme heat generated.