Nevir NVR-9500RA7 Manual De Instrucciones página 12

3. To attach the castor mounting plate to the radiator body, you
should insert the threaded ends of the U bolt in the holes on the
castor mounting plate.
4. Screw the wing nuts back to the U bolt and fasten the wing nut
properly.
Note: do not over tighten, which may cause the damage of radiator
flange.
5、Screw off spherical nut from the castor, align the shaft to the hole
of the castor mounting plate, insert in, and screw on the spherical
nut.
6、Repeat 2, 3, 4 and 5 on the rear of radiator for mounting of the
rear castors.
Note: the rear castors must be mounted between the end two fins.