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Dynafit Binding Heel Unit Breakdown and Assembly
( applies to all model Dynafits, TLT, Comfort, Vertical, FT, ST)

This project is not as tricky as rebuilding a carburetor, but similar attention to detail will yield good results. Taking apart a Dynafit heel unit is easiest if the binding is mounted on a ski. Good mechanical skills are required, as well as proper tools. Only reason for doing this would be to clean and re-lubricate the binding after several years of heavy use, or after exposure to things like salt water or solvents (like spilling your chainsaw gas on the binding while you're doing trail work). Follow along as we dig in:

Dynafit Vertical FT backcountry skiing heel unit.
Today's victim is an 07/08 Dynafit Vertical ST. All Dynafit bindings from the last decade or so have similar or in many cases identical internals, so these instructions will work for most models in use.
 
Tools for working on Dynafit binding heel unit.
These are all the tools you need for disassembly of the Dynafit heel, but to do the job right you should have each one. From top: screwdriver bit holder, large slot bit, #10 Torx bit, small slot bit and right angled pick (optional, for removing thimble bushing in lower part of housing).
 
Dynafit heel disassembly.
First step in taking apart the upper mechanism is to back off the vertical release setting. Crank the adjustment screw until DIN setting indicator is at the lowest marked setting, then give it one more full turn. Don't go past that point. If you neglect this step, the binding will fly apart as you remove parts.
 
Dynafit heel disassembly.
Next, use your Torx screwdriver to remove the fasteners holding the top plate. Lift the top plate off.
 
Dynafit heel disassembly.
The binding will look like this after the top is removed. Just lift the guts out. They'll tend to come apart as you remove. Don't stress, they're really quite easy to re-assemble.
 
Dynafit heel disassembly.
 
Here is a parts breakdown with official names. German is a cool language for this sort of thing.The green goo is lubricant and probably a corrosion blocker. If you're cleaning and re-lubricating you can use a light lithium grease.
 
Assembly of Upper Heel Unit
 
Dynafit heel disassembly.
If you're working on high mileage bindings, inspect housing for cracks in areas indicated by arrows. If the housing is cracked it won't hold the screws securely and must be replaced before mission critical use. Know that with some TLT moldings there may ba a tiny gap adjacent to the screw hole, this is not a crack and not a concern. (Screw inserted to illustrate, not as part of assembly sequence.)
 
Dynafit heel assembly.
This is what the guts look like flipped over after removal. Arrow points to a small nut on a threaded rod (the vertical DIN adjuster). Before re-assembly make sure this nut is at end of rod as shown.
 
Dynafit heel assembly.
Another shot of the top unit for you curiosity seekers. Arrow point to critical nut as described above.
 
Dynafit heel assembly.
First step to reassembly is to pop in this stripped down version of the parts. Place the rear in first, compress the springs, and press the front yoke down and in. The small nut shown in photos above must seat in its dedicated slot. Check by viewing binding from side.
 
 
Dynafit heel assembly.
After you've popped in the yoke and springs, insert the pins with their tapered collars. Orientation is obvious -- if in doubt compare to your other binding (which is hopefully still together).
 
Dynafit heel assembly.
Getting the compensation plate inserted is a bit tricky. Video shows it better than this, but basically you insert the lower flanges first as shown, then drop the rear down.
 
Dynafit heel assembly.

Don't forget any parts. This small metal plate, the slide liner, is easy to overlook. You can slide it in at any time in the process before running the screws back in. Once everything is in, press all together with your fingers and make sure it feels solid and completely assembled. Replace the top plate and associated small steel reinforcing plate (obvious) and run the screws back in. Gently snug the screws in a cross pattern, then torque down firmly but with much less force than you'd use for most other fasteners.

In the case of high mileage bindings, consider re-inserting the screws with a small amount of regular one-hour epoxy smeared on the threads and under the head -- to help prevent loosening or shearing due to micro movement and metal fatigue. Warning: the four screws holding the Dynafit top plate are sensitive to stripping as they're inserted in plastic, tighten with care, and re-check tightness periodically. Do not over tighten!

 
To remove lower (lateral) release mechanism please refer to our Dynafit brake installation instructions.
 
Remember, taking apart the upper part of the Dynafit heel unit is most often unnecessary and may even void your warranty. But the process might be necessary to maintain or rebuild older bindings hence our publishing these instructions.
 

 

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(Note: Writers, magazines, etc., using this article for reference, please give credit where credit is due.)

 

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