Ive bought a LOT of Chinese skid-steer attachments lately, and have been using them a lot..one thing I have noticed is the equipment is "ass=sembed" but not really manufactured..meaning, yes the bolt is assembled but it's not torqued..no one finished the job..welds are really piss-poor, lack of penetration, welds completely off target and missing the intended weld area and surface spalling all around. Anything like this requires going over it with a fine tooth comb and checking bolt torques and inspecting everything..be sure to fill any gearboxes with lubes and grease like you said you found..nice catch on the grease zerks,that explains why my grease gun won't fit mine