Guys please identify the correct tool

[LO^OK]

Guys and gals, would you identify please what kind of lock nut is this, and respectively what kind of socket should I use to open it?

https://lh5.googleusercontent.com/-ustjjlak_uk/Uh9Pt97CASI/AAAAAAAAAZk/qOYm7ygig8U/s800/PICT3072.jpg

[Tony T]

What is it fastening? Looks like an ordinary allen key

[Liberace]

Adjustable pin spanner.

[LO^OK]

What is it fastening? Looks like an ordinary allen key

Thanks for reply, but I was asking about the large lock nut with the four pin holes

[veggieburger]

Adjustable pin spanner.

Something like this....(assuming that's what you're talking about)

http://www.tormach.com/uploads/images/Gallery/products/maintenance_replacement/maintenance_special_tools/pin_spanner_wrench.jpg

[carpediemracing]

It looks like a lockring that holds in the crank arm bolt so it can act as a self extractor.

To extract you need a pin spanner, as noted above. You can try different things to loosen the lockring piece. Check the back to see what's there, and also check with the manufacturer (online pdf?) to see if there's anything unusual with the lockring.

- put the pin spanner, if it's not adjustable, in a vise. Put the arm on the spanner, push down, turn.
- use a c-clamp or a spring clamp to hold the spanner to the arm, esp if it's adjustable. Then put the spanner in a vise.
- put arm in vise. For whatever reason I have better luck when putting the tool in the vise.

Good luck.

[bobswire]

If self extracting most likely a #8 allen otherwise you'll need the spanner that goes into those little holes and take off the lock ring first.

http://i39.tinypic.com/4uzyfl.jpg

[LO^OK]

Thanks to all for replies and suggestions. Actually the lock ring covers a bearing, acting as the pedal "spindle". The manufacturer, Vista, has been defunct for some time, and there is no way to get anything from them.

What I am trying to do is flush and re-grease the bearings (Enduro), and this lock ring seems the only way to gain access to (I suspect it provide preload to the bearings too).

[Ken Robb]

I agree that a pin spanner is the correct tool to use but--------sometimes lacking that tool I have been able to put the pointy ends of needle-nose pliers in two of the holes and turn the nut. You can't exert much force this way but if the nut isn't too tight it will come undone.

[cekte]

Snap ring pliers

[avalonracing]

Blowtorch?

[LO^OK]

Blowtorch?

lol

[LO^OK]

I though for pointed pliers, but regrettably the ones I got can't withstand much force applied that way; looks I'll have to spend some money on an exotic tool... Thanks to everybody once again.

[rrudoff]

Adjustable pin spanners are pretty pricy, but as someone else suggested snap ring pliers are a good option and cheaper. You can get with interchangeable tips for pretty cheap, and also have them for snap ring use later. see for example http://www.mcmaster.com/#5391a33/=oa1q9p

[cp43]

Adjustable pin spanners are pretty pricy, but as someone else suggested snap ring pliers are a good option and cheaper. You can get with interchangeable tips for pretty cheap, and also have them for snap ring use later. see for example http://www.mcmaster.com/#5391a33/=oa1q9p

I have a set of the Park pin spanners, they aren't that expensive: $16.49 (http://www.treefortbikes.com/home#navbar=pro___333222335896___283)

Chris

[LO^OK]

I have a set of the Park pin spanners, they aren't that expensive: $16.49 (http://www.treefortbikes.com/home#navbar=pro___333222335896___283)

Chris

This Park spanners should fit the bill as the pin diameter, 2,3mm, is exactly what I need. Thanks.