Bicycle Mechanics - Service for MKS GR9 Pedals
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07-08-08, 10:55 PM
Could someone please post or link to the steps for servicing these guys? I've been searching...
Looks like a seal pops off the end of the axle housing (use a knife
edge unless there are holes suggesting a screw on seal in which
case a punch in the hole should tap it loose). This should expose
a nut or screw which can be removed to slide the pedal off the
shaft/bearings. Clean lube and reassemble. Lubriplate type grease
07-09-08, 08:48 AM
The plastic end cap should pop off. There seems to be a recess under the edge to insert and twist a screwdriver blade.
The retaining nut and washers should then be apparent. Watch out if there are loose bearings. They are probably 1/8" and lots of them so do the disassembly over a clean rag or in a plastic bag to avoid loosing some.
07-09-08, 12:51 PM
The plastic dust cap is the worst part of these pedals, otherwise they are great pedals. There are four recesses on the dust cap suggesting some special tool is needed to remove it. I took my scriber, poked into the side of the plastic to gain some leverage and popped it off (it is not screwed on). There is a retaining nut with two sets of loose balls as you have predicted. They look under-greased to me.
Instead of going through the tedious work of disassembling>cleaning>regreasing>reassembling, has anyone tried... making a grease port out of something to place on the end of the pedal (or poking a tiny hole through the center of the plastic dust cap) and flooding the inside with fresh grease? Any downside to that?
Any downside to that?
Viscous drag and sealing the hole. Otherwise, no problems.
07-09-08, 08:17 PM
Please elaborate, I'm curious.
What else could I use for a grease port on the pedal's end instead of putting a hole in the plastic dust cap?
The plastic caps are more or less not reusable. Nickles fit nicely. You can also get suitable replacements from Harris I believe.
07-10-08, 11:18 PM
Can anyone confirm/disconfirm viscous drag (friction) resulting from the shortcut I had in mind? How much of a problem would it be? Btw, I got the idea from HERE (http://davesbikeblog.blogspot.com/2008/01/useful-little-grease-gun.html)
5th paragraph down:
"You could also drill a small hole in your pedal dust caps to lubricate the pedals. The great thing is, you donít have to disassemble the part."
Grease injection is standard maintenance with speedplay pedals. One
criteria for maintenance is flipping the pedal and if it rotates more
than 180D it is time for grease injection. If the injector doesn't pop
off the seal and grease extrudes through the other side of the pedal
it should be lubed, though full of grease. Speedplays have much
shorter axles than the one in the pix.
Viscous drag means you are losing some wattage to the equivalent of bearing drag. It makes it harder to flip the pedals to get your feet in the clips. It isn't a major drama but you should use quite a lightweight grease to minimise it.
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