Dear Rajar Amesh Puli: I will try to answer your question by supplying several options, the problem of the cake crumbling too much can be due to the following reasons:
1) Rapeseed cake has a tendency to crumble more easily than sunflower cake.
2) Probably, the material coming out of the cooker is too dry.
3) The cake breaker is causing that the cake break too much, in which case you will have to stop using it.
4) That the cake cooler is causing the cake to crumble, which is why we recommend to pre-cooling the cake by injecting air into the chain conveyor that collects the material coming out of the press before feeds the cooler.
5) Or perhap the Expeller Press arrangement is not suitable for the type of seed that you are being processed.
I hope that these recommendations can help you solve the problem, but if you have some additional comment please don´t hesitate and contact me again.
Regards Hector