Help fitting Grass blade to Husqvarna 555RXT

[Muddy42]

Hi,

I have had some issues fitting the grass blade to my 555RXT.  The nut reaches the end of its thread, without applying enough clamping pressure on the blade and it comes lose. Its almost like it could do with an extra washer somewhere to make the stack wider.  I have ended up knackering the Support Cup.  The instruction diagram that came with the machine is tiny and useless.  The online instructions are different and slightly clearer.  I have tried to show the steps that I follow in order. Any help appreciated, before I put a new support cup on and break it too. Thanks.

 

 

 

[Stubby]

There is ( or should be in your kit ) a slightly domed spacer that has female spline that engage with the splines on the shaft . This needs to be in the stack at some point .

[Muddy42]

Thanks, very helpful, glad it sounds like I am on the right track.

 

There is no spacer or washer in the box nor any mention that it is required in the manual. However I have some washers that will fit.

 

thanks again.

[Dan Maynard]

Isn't that the support flange though Stubby? Seems like the parts in the part diagram are as being fitted, per this one on L&S. My question is whether we know nut to be original?

 

 

 

 

[Muddy42]

This is what is shown in the manual, which I believe I have followed exactly (as shown above).  It still feels like the stack is too short.

[Stubby]

23 minutes ago, Muddy42 said:

This is what is shown in the manual, which I believe I have followed exactly (as shown above).  It still feels like the stack is too short.

Have you got the correct grass knife ( thickness ) or is it an aftermarket one that might be thinner ?

[scbk]

Is it the blade that came with the machine from new? You do sometimes get different thicknesses (how thick is it?)

 

 

Stubby beat me to it!

Edited August 17, 2022 by scbk

[Stubby]

5 minutes ago, Stubby said:

Have you got the correct grass knife ( thickness ) or is it an aftermarket one that might be thinner ?

@adw

[adw]

There were two different support cups, the metal one, and the plastic one with ball bearing in the middle, the metal one I was sure went on against the blade then the flange sat inside then the nut, the ball bearing support cup the flange went against the blade then the support cup which also incorporates its own securing nut, it may well have changed as the metal support cup was a later addition, the machine should always be turned upside down so as the blade can be aligned correctly on the flange arbour.

[Muddy42]

3 hours ago, Stubby said:

Have you got the correct grass knife ( thickness ) or is it an aftermarket one that might be thinner ?

Its the stock grass blade that the machine came with. I tried it this evening with two extra washers from my workshop and the blade stayed tight, centered and spinning well. I have also ordered a replacement support cup.