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70 TREK ASSEMBLY MANUAL 27 April 2012
Supporting Information
Parts Lubrication
Loctite Applications
We use Loctite, or similar product, in a variety of applications in fabrication and
assembly of our bikes. Here’s a partial list, and the recommended Loctite product:
Crown pinch bolts 242 Blue
Brake arch bolts 242 Blue
Cantilever studs 242 Blue
Pivot axle bolt 290 Green
Pivot bushings: Frame/swingarm 290 Green or RC 680
Shock mount bolts 242 Blue
Airhead bearings RC-680
Use Loctite carefully. Follow the instructions on the package, avoiding contact with
your skin, or inhaling the vapors. As noted on the package, Loctite contains a known
carcinogen.
For Loctite to work correctly, the parts must be clean and dry, with no grease, oil, or
dirt. Loctite Kleen ‘N Prime is an excellent cleaner and will reduce xture time.
With blue 242 Loctite, apply to the threads prior to assembly. It will set up in 20
minutes, with full cure taking 24 hours. With green 290 Loctite, application is
recommended after assembly. However, this can be impractical with hidden threads,
like on the rear suspension pivot bolts, or when using as a xing agent for Klein
bottom brackets or rear suspension bushings. 290 is set in 3 minutes, and again
requires 24 hours for a full cure. Please do not confuse Loctite 290 with Loctite 640
or 680, which are also green, as these can make disassembly much more dicult.
Recommended Grease Applications
Most threaded fasteners will benet from the application of a light grease-type
lubricant. This prevents corrosion and galling, as well as allowing a tighter t with
a given torque. For this reason, it’s a good idea to lubricate almost all threaded
fasteners. But some fasteners and parts interfaces really need grease.
When lubricating parts for assembly, only a thin lm of lubricant is necessary. Any
excess lube must be removed or it will attract dirt.
•Seatpost/seat tube interface . Grease the seatpost where it inserts into the frame on
all aluminum and steel frames.
•Bottom bracket threads . We recommend applying grease to all bottom bracket/
frame interfaces, as well as the bearing/cup interfaces. This prevents corrosion and
will virtually eliminate creaks, a common complaint among riders with cartridge
bottom brackets.
•Stem/steerer interface . Grease the quill of conventional stems where they insert
into the fork. With Aheadset type stems, a light oil is recommended with metal
steerers, as grease may make it difficult to properly secure this type of stem to the
steerer.
•Stem/handlebar/bar end pinch bolts . Any and all of these fasteners are small, so
corrosion or galling can really cause problems. For the safety of the rider its also
critical that the bolts are correctly tightened. Grease the threads as well as the
bearing surface of the fasteners, where the bolts rotate against the fixed part.
73


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