50mm SMR fork oil change

[DErZ]

Gents I'm stuck. 1 of my forks was leaking so thought it prudent to change the oils seals. So I stripped the fork, fitted the new seal and then had to wait for a 50mm seal driver to turn up. So while waiting I stripped the other good fork. I saved both amounts of oil out of each fork to compare.

Fork that was leaking has 725ml
Good fork has 710ml

Now Im stuck as I dont know how much to put back in? I dont understand the manual.

"Filling with oil
The R5051AC is available as spare part: if you tighten it on the rod’s edge,
you can make the rod extraction from the inner part of the slide easier.
• Lift the slider completely on the stanchion tube.
• Prepare the quantity of oil to pour into the fork leg (see Table 2 – Oil and
quantity).
OIL AMOUNT FOR EACH STEM:
TE: 725cm3
SMR: 740cm3
• Pour roughly 2/ 3 of the required oil into the slider ( 13 ), then pump the fork
a few times to remove any traces of air.
• Pour the rest of the oil in.
• Lower the slider on the stanchion tube until it reaches the dust seal stop on
the wheel axle clamp.
• Wait a few minutes and check the air volume (see Table 2 - Oil and quantity)
and if necessary refill to the right level"

Also Table 2 doesn't actually state an oil amount?!?!?!

What have people torqued the bottom valve too?

Any help greatly appreciated.

 

[lankydoug]

View: https://www.youtube.com/watch?v=Y43k1qFVGW4

View: https://www.youtube.com/watch?v=C9ICr-DOmdk


50mm cartridge style forks fill to an oil level not a specific cc amount. The level on those is 130mm, you can decrease the air gap to as little as 110mm for a firmer initial cushion.

The two videos I attached shows how to do the complete job as well as how to measure. I made my own tool from a large syringe and a piece of tubing. You can also measure with a small thin ruler or simply mark anything that could be used like a dipstick

 

[darealickt]

If it's a 2008-2010 SMR with 50mm Shivers, the gap is measured without the spring, without the bottom preload spacer, and without the rebound rod. You measure with the outer tube fully compressed. Air gap measurement is 100 mm to 110 mm taken from top of outer tube to top of fluid level. Make sure you put like 500cc of fluid in to start with and pull up and push down on the damper rod many times to get fluid sucked into the entire cartridge before adding the rest of the oil and taking your air gap measurement. It can take 50 or more full up and down strokes to fill the cartridge. You will know it's full when the entire stroke up AND down has resistance.

 

[darealickt]

http://docs.husqvarnaoutlet.com/manuals//2010 TC-TE-TXC-SMR 310-450-510.pdf

 

[DErZ]

Thanks chaps, mines a 2011 511 SMR. So if you say its `130mm that means a 130mm from the top of the fork, I can measure the depth after pulling the damper rod a few times until its full of oil?

What does 740cm3 mean? how does that relate to 130mm?

The manuals state that there are tables with oil levels but searching yields no results.

2011 SMR manual states

##OIL AMOUNT FOR EACH STEM:
TE: 725cm3
SMR: 740cm3

Front fork oil CASTROL SYNTHETIC FORK OIL 5W
TC - TXC: 33.93 cu.in (556 cu.cm)
Cartridge: 11.35 cu.in (186 cu.cm)
Fork sleeve: 22.58 cu.in (370 cu.cm)
TE: 40.28 cu.in (660 cu.cm)
SMR: 45.16 cu.in (740 cu.cm)

 

[lankydoug]

I set mine at 130mm and then if you want a bit firmer ride 12cc oil =10mm of height and you can add 12cc through the air bleed hole. Since it's much easier to add then subtract oil I start at 130. BTW my 50mm Zokes on my 09 wr250 work very good at 130 so I had no need to put in any oil.

 

[lankydoug]

Also if you should ever need to replace the fork seals on your forks the SKF seals have less stiction and improve the feel of the forks. My SKF seal have already lasted 2 years 2 oil changes of off road riding and still going strong.

 

[Super5onic88]

Cm3 = ml bud.
740ml or
.74L

 

[DErZ]

I finally found the answer.

Its not in the 2011 manual but it is in the 2012.

Thanks for everyones help and advise.

Fork oil level (SMR)
For regular fork operation, both legs must be provided with the necessary oil
quantity.
Remove the fork legs from the fork to check the oil level. Work as follows:
- remove the damper rod caps;
- remove springs from the legs letting the oil drain into the legs;
- bring fork to stroke end;
- check that level is at the distance (A) of 100 mm (3.94 in.) from rod upper
limit.
MY11:
OIL QUANTITY IN EACH FORK LEG
740 cm3
(45.16 cu.in)
MY12:
OIL QUANTITY IN EACH FORK LEG
720 cm3
(43.94 cu.in)

 

[DErZ]

After doing a bit more research, the 2011 manual states 740cm2 with 100ml gap and the 2012 manual quotes 720cm3 with 120ml gap.

I played safe and went 720ml with 120ml gap.

 

[gopie]

Hi DErZ, im just about to change the oil seals on my '11 smr 449 and was just wondering if the oil levels you used worked out ok? cheers