  Using M\"ossbauer and EPR spectroscopy we have studied the insulating
ferromagnetic La$_{1-x}$Ca$_x$Mn$_{0.99}$$^{57}$Fe$_{0.01}$O$_3$ ($x=0.175$)
compound prepared in air and reduced atmosphere. The average hyperfine field
follows a mean field approximation solution in contrast with the ferromagnetic
metallic regime where it significantly deviates from the order parameter
deduced from neutron diffraction data or mean field approximation. Although the
magnetic measurements show remarkable differences between air prepared and
reduced R samples the corresponding M\"ossbauer spectra are almost identical.
The strong temperature dependance of the hyperfine field distribution at the
$^{57}$Fe nucleus is related with the supertransferred magnetic field between
ferric ion and the oxygen bridged six nearest-neighbor manganese ions. The
sudden increasing of the width of the hyperfine field distribution above
$T_B\approx 100$ K has been attributed to the orbital disordering occurring for
$T>T_B$.
