The gearbox was not designed to bear weight pf the pump. The pump needs to be fixed to the frame of the machine with adequate supports. Supports allowing for connection of the pump towards the engine can help during the assembly process
Installation Warranty:
There is no warranty on improper installation of the gear box assembly. If you do not feel confident to install this on your own motor, we highly recommend taking it to a reputable service center to install it for you.
Proper installation on these gear box assemblies is the most important thing you can do.