Mobile coring machine with adjustable mast

A mobile coring apparatus, comprising:

• a machine frame comprising a mount;
• a mast pivotally connected to the mount;
• and
• a coring assembly coupled to the mast, the coring assembly configured to drive a core bit for coring through a surface,
• wherein the mast is configured to pivot relative to the mount between a forward position and a rearward position,
• wherein the mast extends from a mast top end to a mast lower end, and the mast is pivotally connected to the mount towards the mast lower end,
• comprising an angular adjustment mechanism that permits the mast to pivot between the forward and rearward positions and locks the mast in place relative to the mount, and
• wherein the angular adjustment mechanism comprises a pivot wheel assembly, the pivot wheel assembly comprising:
• a pivot rod extending between the mast and the mount;
• and
• a pivot wheel operable to rotate the pivot rod,
• wherein the rotation of the pivot rod pivots the mast about the mount.