Power shift multi-gear planetary gear unit with a shaft drive (2-Fig.1), a first, second and third intermediate shaft (3, 4, 5), an output shaft, a basic transmission and an expansion transmission, wherein the basis transmission comprises a first, second and third sun gear (11, 12, 13), a first, second and third ring gear (31, 32, 33) plus a first planet carrier on which a first, second and third planet wheel (21 a, 21 b, 21 c) are arranged, wherein the first, second and third planet wheel (21 a, 21 b, 21 c) are rigidly connected to one another or consist of a body, wherein the expansion transmission comprises a fourth and fifth sun gear (14, 15), a fourth and fifth ring gear (34, 35) plus a second planet carrier on which a fourth and fifth planet wheel (22a, 22b) are arranged, wherein the fourth and fifth planet wheel (22a, 22b) are rigidly connected to one another or consist of a body, wherein the first planet wheel meshes with the first sun gear and the first ring gear, wherein the second planet wheel (21 b) meshes with the second sun gear and the second ring gear, wherein the third planet wheel (21 c) meshes with the second sun gear and the second ring gear, wherein the fourth planet wheel meshes with the fourth sun gear and the fourth ring gear, wherein the fifth planet wheel meshes with the fifth sun gear and the fifth ring gear, wherein the first ring gear can be connected to the gearbox housing by a first switching element (61, 38); wherein the second ring gear can be connected to the gearbox housing by a second switching element; wherein the third ring gear can be connected to the gearbox housing by a third switching element (63, 37); wherein the fourth ring gear can be connected to the gearbox housing by a fourth switching element (64, 37); wherein the fifth ring gear (3 5) can be connected to the gearbox housing by a fifth shifting element (65, 38); wherein the shaft drive can be connected to the first planet carrier by a sixth switching element; wherein the first planet carrier can be connected to the second intermediate shaft by a seventh switching element, wherein the second intermediate shaft can be connected to the second planetary carrier by an eighth switching element, wherein the second planet carrier can be connected to the output shaft by a ninth switching element, wherein the drive shaft can be connected to the first intermediate shaft by a tenth switching element, wherein the first intermediate shaft can be connected to the second intermediate shaft by an eleventh switching element, wherein the second intermediate shaft can be connected to the third intermediate shaft by a twelfth switching element, wherein the third intermediate shaft can be connected to the output shaft by a thirteenth switching element, wherein the first intermediate shaft can be connected to the first sun gear by a fourteenth switching element (41, 28) to the second sun gear by a fifteen switching element and to the third sun gear by a sixteenth switching element (43, 27), wherein the third intermediate shaft can be connected to the fourth sun gear by a seventeenth switching element (44, 27) and to the fifth sun gear by an eighteenth switching element (45, 28), wherein the first ring gear can be connected to the second intermediate shaft by a nineteenth switching element, wherein the fourth ring gear can be connected to the output shaft by a twentieth switching element, wherein the ninth switching element is a disengageable freewheel clutch, wherein the tenth, twelfth, and nineteenth switching element (28, 28, 28) are each a freewheel clutch, wherein the first (61,38), third (63,37), fourth (64,37), fifth (65,38), fourteenth (41,28), sixteenth (43,27), seventeenth (44, 27) and eighteenth (45, 28) switching elements each consist of a shift clutch and a freewheel clutch arranged parallel thereto, wherein all the other switching elements being in each case shift clutches.