What are the main obstacles when applying lean manufacturing system?

the main obstacles is: resisting the change 

Proper planning is require when we are appling lean manufacturing system.

customer tact time and plant takt time should be equal

identifying the wastes in produciton lines

1. Inadequate communication across the spectrum of the organisation and workforce  resulting into low workforce commitment.
2. Inadequate Planning and inadequate new/modified processes.
3. Constraints in change of layouts.
4. Inadequate/Unoptimised  partnering with Vendors.
5. Improper Inventory Management.
6. Challenges in set up of jobs.

Culture and the commitment of the administration in support of the application. to get the results and motivate employees to think and dissatisfaction with reality whatsoever and find always the best in everything we do from activities no matter how simple