spacer washer on drive shaft ?

[kk rider]

dear all

i appreciate if someone could help and advise me for my R26 .
it is about the distance between the output flange and drive shaft flange and its adjustment by the spacer washer( please see the first picture ).

the manual says
" the distance between output shaft coupling flange and that of the universal shaft be checked , which must be 30+1.5mm  "

when i checked the distance on my R26 ,  it was  in 33.5mm .........  2mm bigger .
so i believed i could  adjust  the distance into 31.5 mm by changing the spacer washer ( please see the second picture , it is a part  No. 3 ).
( this spacer washer is available in 3 thicknesses , 1mm , 2mm , 3mm )

but when i disassembled the drive shaft flange   , i found 3mm spacer washer was used on the shaft .
well, 3mm spacer washer is the thickest one from the available spacer washers .
( i originally guessed that it must had got 1mm spacer washer and i could change it into 3mm one to sort the problem . but this guess was totally denied .)

the manual also says
"  If the distance must be corrected , insert a shim of appropriate thickness behind the coupling flange of the universal shaft  "
(  well i often get confused by the descriptions on the manual )
could i add an extra 2mm spacer washer  on top of the 3mm spacer washer to make the distance in 31.5mm ?

or should  the shaft have  a single space washer and should i suspect somewhere else like a worn coupling hub , bevel gear ........ ?

by the way what is the description [30 + 1.5 mm ]for ( i wonder why it isn't described as  31.5mm ) ?  also how important is the the distance ?

does anyone know how it should be or what  should i do as the solution  ?

regards

kei

[kk rider]

[Rütz]

Hi kei,

should i suspect somewhere else like a worn coupling hub , bevel gear ........ ?

Not necessarily a worn coupling hub yet, but maybe worn rubber rings, which hold the coupling in its correct position and may cause wear if not renewed by time.
If you observed a change of the flange distance, it should definitly be checked.

by the way what is the description [30 + 1.5 mm ]for ( i wonder why it isn't described as  31.5mm ) ?  also how important is the the distance ?

It's a kind of "locksmith-german", meaning:
Distance must in any case be greater than 30 (otherwise flanges will "kiss" on full suspension, causing flange- or shaft breaking), but should not be greater than 31.5 to avoid to much stress on the pins.

[rolf]

When you measure ist....was the swing arm horizontally?

[kk rider]

hi Rütz

thank you for helping me again . i always  appreciate your advice .

sure,  there are 2 rubber rings on the front and rear of the coupling hub. i should suspect them first as you said.
anyway it is a good opportunity to change rubber stuffs.

to take off one of the rubber rings , i believe i have to unscrew the special splined nut (photo below , also it is indicated as 20 on the parts drawing ).
do i need a special tool to unscrew the nut , or  is there a Matra tool for it ?
also how much torque is required on the nut ?
( sorry , i couldn't find these info. on the manual )

thank you for explaining me the meaning of [30 +1.5mm] , it is very clear to me now ,lol. 

best

kei

[kk rider]

thank you ,Rolf

yes, i measured the distance when the 2 flanges were parallel  by lifting the swing arm at rear.

best

kei

[rolf]

hallo,
you can use a sharp screwdriver for turning the nut using it like a lever ....with help of the coupling flange tappets (?)....no torque necessary....you have to put a spline through it....so you must see a hole....having a torque it was a fortúne to see a hole

[kk rider]

thank you Rolf for your help again ,

sure ,i would try with a screwdriver . if i found it was difficult , then i will get the special tool from S.meyer as  i found they had one .

also i thank you for your advice about  the torque .
i guess what you mean is  i just tighten the splined nut till i could see the hole as i could put a split pin through the hole .
if it is wrong , please revise me .

regards

kei   

[rolf]

it is right....tighten as much as possible PLUS seeing a hole