Modern mining drill rigs are hydraulic machines. From the boom that positions the drifter to the feed that advances the drill, from the rotation unit that turns the rod to the stabilizers that anchor the rig — all of these functions are powered by hydraulic pressure. At the center of this system sit the hydraulic pump and motor, the components that generate and convert that power. When they fail, everything stops.
How Hydraulic Pumps Work in Drill Rigs
The hydraulic pump is driven by the rig’s diesel engine and converts mechanical energy into hydraulic flow and pressure. Most modern drill rigs use variable displacement piston pumps, which can adjust their output flow to match the demands of different functions — drilling, tramming, positioning — without running the engine at constant maximum load.
The pump draws hydraulic fluid from the tank, pressurizes it, and delivers it through the circuit to the various hydraulic motors and cylinders that perform work. Pressures in modern drill rig hydraulic systems typically range from 200 to 350 bar — far higher than most industrial hydraulic applications — which places enormous stress on pump components.
Hydraulic Motors: Converting Pressure Back to Motion
Where the pump converts mechanical energy to hydraulic, hydraulic motors do the reverse — they take pressurized fluid and produce rotation. In a drill rig, hydraulic motors drive the rotation unit (turning the drill rod), the track drive (tramming), the hoist, and various other functions. Like pumps, motors used in mining applications must handle high pressures, contaminated environments, and continuous duty cycles.
Common Pump and Motor Failures
Internal leakage develops as wear clearances increase between pistons, cylinder block, and valve plate. The pump or motor continues to operate but at reduced efficiency — more engine power is required to achieve the same output, fuel consumption rises, and performance drops.
Bearing failure causes noise, vibration, and eventually shaft failure. Bearings in hydraulic pumps and motors are precision components that require clean, correctly specified hydraulic fluid for lubrication. Contaminated fluid is the leading cause of bearing failure.
Shaft seal failure allows hydraulic fluid to leak externally around the pump or motor shaft. Beyond the obvious fluid loss and fire risk, an external leak introduces air into the suction line when the shaft seal is on the inlet side — causing cavitation that rapidly destroys pump internals.
Contamination damage is perhaps the most devastating failure mode. Even fine silica particles — common in mining environments — circulating through a hydraulic pump at high pressure act like grinding paste on precision-machined surfaces. A single contamination event can destroy a pump worth thousands of dollars in hours.
Preventing Hydraulic Pump and Motor Failures
The single most important protective measure is maintaining clean hydraulic fluid. Regular fluid sampling, filter replacement at correct intervals, and proper procedures for adding new fluid (always through filtration, never directly into the tank) will extend pump and motor life dramatically.
Correct hydraulic fluid specification is equally important. Using the wrong viscosity grade — too thin or too thick — reduces the fluid film that protects metal surfaces and accelerates wear.
For operations that push equipment hard, installing additional case drain filtration for piston pumps and motors provides an extra layer of protection against case drain contamination recirculating back to pump internals.
KTS Supplies Hydraulic Range
KTS Supplies supplies hydraulic pumps, hydraulic motors, and a comprehensive range of hydraulic spare parts for mining drill rigs operating across Ghana. Whether you need a complete pump replacement, a repair kit, or specific internal components, their procurement team can source the right parts for your equipment quickly and reliably.
