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USPD Pinion Sprocket Change
1) Use a 6mm Allen wrench to remove the three bolts holding the
motor to the gear
housing of the drive system. Pull the motor straight out from
the housing. Note the flat
spot on the motor shaft. When re-installing the motor, be sure this flat spot is aligned
with the flat spot in
the gear at the center of the drive.
Remove the aluminum "gasket"
from between the motor and housing. (see
NOTE: The aluminum "gasket" is ONLY required
when installing the "silver can"
motor shown in the picture below. All other motors (BMC, MAC, Kollmorgen)
must be installed WITHOUT this "gasket".
2) Remove the four screws holding the planetary gear set in
3) Lift out the planetary gear and set aside. (below)
4) Locate and remove retaining clip on the chain master
link. Remove chain. (below)
5) Turn the housing over and remove the sprocket assembly being very
careful to note
the position of all spacers.
Draw a diagram to help you remember the order in which
these parts are assembled on the splined shaft!
The are two types
of pinion sprocket assemblies used in Currie USPD drives.
Picture A is the .500" or 1/2"
B is the 12mm
*There is only one type for a Lashout bike, picture
*Rayos and Electrec use the 18mm type not shown here.
MUST DETERMINE WHICH IS CORRECT FOR YOUR DRIVE
CERTAIN TO RETAIN THE PROPER ORDER OF SPACERS
SHAFT! FAILURE TO ASSEMBLE PROPERLY CAN RESULT
SEVERE DAMAGE TO THE DRIVE.
( Order of parts L to R = Nylon, sprocket, Nylon, steel,
snap ring, steel)
(Order of parts L to R = Nylon,
6) Remove the Nylon spacers, sprocket, and steel spacer(s) from the
drive shaft. Install the
sprocket with the Nylon and steel spacers in the same order as removed. (see
sure the splined
(grooved) end of the shaft, Nylon spacer, sprocket, and steel
spacer are in the
exact order shown
above! NOTE that the pinion sprocket "teeth" are
offset to the right.
(away from the splined portion)
7) Insert the new pinion sprocket assembly back into the housing
making sure the steel
on the drive shaft! (it can fall of and lodge under the pinion if you're
8) Do NOT install the chain yet, since it
will installed last. Re-assemble the rest of the
drive unit in the same
order it was disassembled.
***All custom sprocket combinations vs. chain
9) The chain may need to be lengthened or shortened
depending on whether you installed
a larger or smaller pinion sprocket. If you're unfamiliar with this process, refer
the Length of a Chain" in the kit index for assistance. When replacing a
stock 19T sprocket
with a 21T or 22T sprocket it will be necessary to add a "half link" to your
how to do that:
9a) To increase the length of the chain, it is first necessary to remove a
link. Do this by carefully tapping out the appropriate chain pin with a small
punch and hammer. The picture below shows the original length chain, (top) and
the resulting chain length. (bottom) NOTE: A "link" consists of
2 segments. (holes) The picture below shows exactly which pin to drive out in
order to remove a single link. NOTE: Try using a vise as an
"anvil" to aid in removing the pin. Place the chain on top of the
closed vise jaws, then open the jaws just wide enough to allow the pin to be
driven down between them.
9b) Replace the chain around the rear sprocket. Using two master links and a
"1/2 link", as illustrated below, connect the chain ends. When the
chain ends are linked, the resulting chain will be longer than the original
chain by 1/2 link! (one hole) This additional length is necessary to accommodate
the increased pinion size.
9c) If you are unable to achieve the correct chain length you may need a
chain block which provides a greater degree of adjustment than the stock part
allows. See below:
EVDeals Delrin Chain Block Installation
Your adjusting block can be installed in any one of four
orientations. i.e., there is no "right" way to position the
block. Select the positioning that best suits the condition
and tension of your chain. The object is to remove all but
a small portion of the chain slack without causing binding.
Place the adjusting block into position and determine the
best orientation. Install the chain block using the original
washers and bolt. If necessary, you can place one or two
washers under the block to provide proper clearance.
Before tightening, rotate the wheel and be certain
chain moves smoothly over the block.
The picture below shows how the Delrin block is positioned
to guide the chain smoothly between sprockets of a Currie
USPD bike drive unit. The same positioning applies to
all Currie scooter drives.
HINT: The chain can be
fed through the opening on the side of the drive assembly
AFTER the drive unit
is fully assembled. Feed one end of the chain into the opening
adjacent to the
pinion gear. By turning the gear with your finger, the chain will be dragged
around the gear and return out the same opening.
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