HP Velotechnik trikes - Manual (Page 58)

Gear system and chain
54
Push the bolt back through the chain roller,
the washer and the chain retention hook, se-
cure the thread with Loctite and tighten the
bolt with 17-19 Nm. The recessed side of the
chain roller has to face to the frame. Make
sure the washer is placed between chain
roller and plastic tube / frame.
Changing the lower chain tube
The chain tube is connected to the mounting
plate by a rubber sleeve. For dismounting the
chain tube, grab the sleeve on its rear end and
pull it together with the chain tube to the
rear. The rubber sleeves will release the rear
tongue of the mounting plate then. Swivel the
chain tube sidewards. Having done that pull
the chain tube to the front to release the
sleeve from the front tongue of the mounting
plate. Replace the chain tube and mount it by
following the above steps vice versa.
Chain roller
The chain roller guides the chain below the
seat to the rear wheel and is an essential part
of the HP V
ELOTECHNIK
No Squat design. It
ensures that the suspension is not influenced
by pedalling.
Compared to other models the chain roller
has a big diameter and it has a higher area in
the middle to make the chain move as
smoothly as possible. Due to this higher area
the chain does not lie on the roller with its
sharp edged links but with the bushes in the
middle that work like small bushings. In addi-
tion to a very low rolling resistance it also
supports a quiet chain movement. A chain re-
tention hook between the frame and the
chain roller locks the roller at the bottom and
keeps the chain on the roller when you pedal
backwards.
Chain roller, chain hook and chain tubes on
Scorpion fs 26
The chain roller wears slowly and gradually
shows a sprocket shape in the higher area in
the middle. When this middle area is worn
completely the links of the chain will run on
the roller. In that case you will notice that the
chain makes more noise while running and
you should change the roller. You can pur-
chase the plastic part without the bearing or
the complete roller through your dealer.
The bearings must not be treated with a jet of
water from a high-pressure cleaner or with
solvents since this may destroy the sealings
and remove grease from the bearings. If the
bearings don't move smoothly anymore you'll
have to replace them.
Caution! The roller comes with
two maintenance free sealed bearings. The
bearings are exchangeable. Between the
bearings there is a spacer that keeps the
correct distance. If you forget to put in the
spacer after you have dismounted the
bearings they will be destroyed when you
tighten the screw while remounting them.