Bosch Gen 3 Right hand crankshaft bearing fits in the right hand motor cover and supports the sprocket carrier and crankshaft.

Bosch Generation 3 motor BDU3xx (NOTE: Large chainring)

Bosch Gen 3 Sprocket Carrier O-ring PLB30526 to fit the right hand side of the Bosch Gen 3 crankshaft sprocket carrier.

Bosch Generation 3 motor BDU3xx (NOTE: Large chainring)

This bearing supports the electric motor armature and fits into the left hand motor cover (non drive side).

Bosch Generation 4 BDU4xx

This kit contains the bearings, seals and circlips required to overhaul the Bosch Gen 4 crankshaft. We don’t usually say this, but we would not recommend you tackle this motor without a lot of specialist tools and a strong mechanical engineering background.

This kit will fit the Gen 4 Performance Line CX, Cargo and Speed motors.

Bosch Generation 4 motor BDU4xx.

Please see bearing identifier for bearing position.

Bearing will fit the Gen 4 Performance Line CX, Cargo and Speed motors.

Bosch Generation 4 motor BDU4xx.

Please see bearing identifier for bearing position.

Bearing will fit the Gen 4 Performance Line CX, Cargo and Speed motors.

Bosch Generation 4 motor BDU4xx.

This bearing supports the left hand side of the Bosch Gen 4 crankshaft. It will fit the Gen 4 Performance Line CX, Cargo and Speed motors.

Bosch Generation 4 motor BDU4xx.

Bosch Gen 4 Lower Armature Bearing O-ring PLB40529, bearing will fit the Gen 4 Performance Line CX, Cargo and Speed motors. Please see bearing identifier for O-ring position.

Bosch Generation 4 motor BDU4xx.

Please see bearing identifier for bearing position.

Bearing will fit the Gen 4 Performance Line CX, Cargo and Speed motors.

Bosch Generation 4 motor BDU4xx.

Bosch Gen 4 O-ring Gear Shaft Small PLB40531, bearing will fit the Gen 4 Performance Line CX, Cargo and Speed motors. Please see bearing identifier for O-ring position.

Bosch Generation 4 motor BDU4xx.

Bosch Gen 4 O-ring Lefthand Crankshaft PLB40532, bearing will fit the Gen 4 Performance Line CX, Cargo and Speed motors. Please see bearing identifier for O-ring position.

Bosch Generation 4 motor BDU4xx.

This kit contains every bearing that is changeable in the Bosch Gen 4 motor. We don’t usually say this, but we would not recommend you tackle this motor without a lot of specialist tools and a strong mechanical engineering background.

This kit will fit the Gen 4 Performance Line CX, Cargo and Speed motors.

Bosch Generation 4 motor BDU4xx.

This is the bearing that supports the right hand (drive side) of the Bosch Gen 4 crankshaft. It will fit the Gen 4 Performance Line CX, Cargo and Speed motors.

Bosch Generation 4 motor BDU4xx.

BEARING PROTECTION RING SERVICE KIT FOR Gen 4 (BDU4XX) MOTORS

• Used for protecting the outer left and right hand crankshaft bearings.
• 1x Left hand bearing ring seal.
• 2x Circlips.
• 1x Right hand bearing ring seal.
• 1x tube of grease 20g
• 1x lifting-tool