Kindly refer the MCA Notification September 2015 in which it is stated that private Company can borrow any amount from directors or relative of directors by submiting declaration cum affidavit on the stamp paper of appropriate value.
However as per general rule in Section 180(1)(c)- A company can borrow the money maximum upto 100 percent of paid up share capital, free reserves and securities premium account by passing special resolution in general meeting. But however section 180 is not applicable on private company so Company can borrow any amount from directors and there is no need to file MGT 14 as this section is not applicable on private limited company.
Furher Section 179 to borrow the money , Company do not require to file any MGT 14