Old Bush Hog leaking

[BruceMyers48]

The gearbox on a 20 year old Bush Hog is leaking, can I fill with grease, what type should I use and should I drain old oil out first?
Thanks in advance

 

[TractorTech]

Corn head grease or semi-fluid NLGI #0 grease

 

[BruceMyers48]

Thanks

 

[BruceMyers48]

Corn head grease or semi-fluid NLGI #0 grease

Is there a easy way of putting the grease in there,

 

[TractorTech]

Is there a easy way of putting the grease in there,

It is a really viscous, but pourable oil.