HYDRAULIC ROTARY DRILLING MAST AND HEAD
Driven by hydraulic motor fitted with a 7 : 1 ratio gearbox with manual gear change providing full controlled power and rotational speeds in forward or reverse with integral side inlet water swivel with BW Rod connection fitted to travelling carriage plate with bolts.

High range
Maximum Torque 125 ft/lbs 170Nm
Maximum Spindle Speed 312 r.p.m.

Low Range
Maximum Torque 780 ft/lbs 1059Nm
Maximum Spindle Speed 50 r.p.m.

MAST AND CARRIAGE ASSEMBLY
Fabricated welded steel box section construction fitted with a pair of rubber wheels and two levelling jacks. Hydraulically raised and lowered by single double acting ram on the main Terrier undercarriage and attached when required to main Terrier undercarriage via Pivot Frame Assembly.

Overall length/height : 2.4m - 3.5m
Guide Ring: 160mm effective ID

FEED AND HOIST SYSTEM
Provided by single double acting ram transmitting adjustable hydraulic load to the rotary.

Stroke 2.3m to accommodate 2.0m effective length drill rods

Feed force 1000Kgf
Hoist force 7000Kgf

CONTROLS AND HYDRAULIC POWER
Hydraulic functions of hoist/feed and rotation are controlled from main hydraulic control valve on the Terrier and hydraulic power is supplied via PTO from the main Terrier hydraulic power pack.

Weight
Dando Terrier equipped with rotary head mast assembly 1041kg
Rotary head mast assembly attachment 265kg

JACK LEGS
Set of stabilising jacks.