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
This O-Ring sits between the front chainring (or chainring spider) and the lock nut. The O-ring is not fitted to all bikes, a new one should only be fitted if an old one is removed.
Bosch Generation 4 motor BDU4xx.
Bosch Gen 4 Sprocket Carrier O-rings PLB40530, 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.
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.
Crank arm puller for Bosch, Brose, Impulse, Yamaha. This puller will fit all models of all motors.
It fits ISIS drive cranks, square drive cranks and the Bosch Gen 3 Octalink. There is a button on the end and you just need to use it or not, depending on the type of crank you have.
This is a durable double lip seal, specifically manufactured to fit the Bosch crankshaft. An effective waterproof barrier for the Bosch right-hand crankshaft bearing.
If fitted with the MudStop bearing seal it makes a formidable barrier against water, mud or dust entering into the bearings of your expensive motor. Click here for instructions:
With seal and MudStop fitted below.
Bosch Generation 2 motor BDU2xx below (NOTE: Small chainring)
MudStop sealing system was designed by VeloLab to ensure better protection for the vulnerable main motor bearing on the Bosch Active and Performance Line / CX motors.
Unlike the Bosch protection seal, MudStop completely covers the entire main motor bearing and outer casing. This stops water and contamination getting past the cover and entering the bearing.
When used with the custom made crankshaft seal, it makes your motor as protected as it always should have been
Full information and instructions can be found here:
If you want to fit the MudStop to your Bosch motor and have the plastic motor covers fitted, you may require the cutting tool to open out the case to accommodate the MudStop bearing seal. See instructions here:
This kit is designed for the mechanic or engineer who has the tools to fix their motor but is undertaking this work for the first time. It includes the special tools required to remove the motor and all the seals to help keep your motor running smoothly once your work is done.
We have taken a genuine Bosch service / repair kit, removed the felt seals*, then added all the parts required for the rest of the motor. Left-hand crankshaft bearing, freewheel gear bearing, both transfer gear bearings, left-hand crankshaft O-ring and sprocket carrier O-ring, all 10 new circlips, the two thrust washers that sit each side of the main crankshaft drive gear, right hand crankshaft seal (this replaces the Bosch felt seals and is 100% waterproof), MudShield for main motor bearing protection, stainless steel bearing shield to offer limited protection for the left hand crankshaft bearing, crankarm puller, special lockring tool to remove front sprocket and a full set of new damping films to fit between the motor and frame. If you already have these tools, please see our Service kit +
We know that many of the motors we work on have suffered water damage to the other bearings used in the drive unit that are not replaced by fitting a Bosch service kit. We have now added these bearings and components to service the left-hand side of the motor too. This ensures you have everything you need to do the whole job properly.
We can fit this kit and bearings for you, and offer our own 12 month Performance Line Bearings parts and labour warranty. Fitting cost £350.50 + p&p
This kit is sold on the understanding that you have a basic level of technical expertise and does not include hand tools or INSTRUCTIONS.
*The felt “seals”, these are causing severe issues and motor failure in wet or dusty conditions.
Bosch Generation 2 motor BDU2xx (NOTE: Small chainring below).
