A series of (TiCr_1.8)_1-xV_x alloys with x = 0.2, 0.4, 0.6 and 0.8 was synthetized by induction melting of a mixture of TiCr_1.8 alloy and pure V. It has been found that after hydrogenation all the compounds turn into bct structure. The present bct metal hydrides could be considered forming a pre-martensite state during the transformation (Ti-V-Cr)H_xmin (bcc) ↔ (Ti-V-Cr)H_xmax (fcc). Proton NMR studies reveal that distribution of hydrogen over all samples is not homogeneous. The modified Bloembergen-Purcell-Pound model, which supposes existence of two hydrogen fractions in different metal environment, provides the lowest averaged activation energy of hydrogen motion corresponding to (TiCr_1.8)_0.6V_0.4, the composition that exhibits the highest reversible hydrogen capacity. Following a regularity in changes of both structural parameters of the studied compounds before and after hydrogenation and those parameters that answer for hydrogen mobility we anticipate the existence of a percolation threshold in properties of the alloys (close to the compositions x = 0.4÷0.5).