Bosch BDU450 CX Quick Start Manual page 8

164 | Drive Unit
Installing Drive Unit (BDU450 CX /
490P)
Work steps
Fit the spider to the
Drive Unit
1. Mount the left-side crank arm.
To do this, grease the bottom
bracket shaft and then tighten
bolt M15 x 1. Tighten using a
torque wrench
Make sure not to mix up
the left and right cranks!
Pedals can come loose if
assembled incorrectly
2. Clean and grease the internal
interlock of the spider
3. Press chainring along with
the mounted spider or
directly mounted chainring
onto the cleaned and lightly
greased interlock . The spi-
der must be on the side of the
chainring facing toward the
bike
4. Slide the O-ring on as far as
the spider. Only use O-rings if
they are intact!
5. Grease the cleaned lock ring
threads and push on the lock
ring . The lettering on the
lock ring must be visible
The lock ring has a
left-hand thread, so
tighten it to the left with
the spider tool. Hold it
back with the left crank
6. Grease the right-side bottom
bracket shaft and mount the
crank arm with the crank bolt
M15 x 1
Tools
Allen key size 8
X
Torque wrench
X
Spider tool for BDU4xx,
X
available from the Bosch
eBike B2B online store
Bearing grease and brush
X
Tightening torques
Lock ring: 30 Nm
X
Crank: according to
X
manufacturer's specifications