Hydraulic Pump Drive Applications and Industries

Hydraulic pump drives sit between the engine and the hydraulic pumps on a wide range of off-highway and industrial machines. They rarely get attention, but without them most of a machine's working functions would stop. This article looks at the industries and applications that rely on pump drives and how each one influences the type of pump drive used.

Why Pump Drives Are Common in Off-Highway Equipment

Hydraulics give machines high force in a compact package along with precise, variable control. That makes them ideal for digging, lifting, conveying, and steering. Most machines run several hydraulic circuits at once, and a pump drive lets a single diesel engine or electric motor power all of those pumps while running each at the right speed.

Drill Rigs

Drill rigs used for water well drilling, geotechnical exploration, and mining rely heavily on pump drives. The pump drive powers the hydraulic pumps that run drill rotation, feed systems, hoisting equipment, and pipe handling. Because these functions often run at the same time, drill rigs commonly use multi-pad pump drives.

Paving Equipment

Asphalt pavers, concrete equipment, and other road construction machines use pump drives to supply hydraulic power to conveyors, augers, screeds, and compactors. Smooth, consistent hydraulic flow is important here because it directly affects the quality of the finished surface.

Rail Maintenance Equipment

Rail maintenance machines have a long history of using pump drives to run hydraulic work functions. These machines often use a clutch input connection on the pump drive, which allows the hydraulic pumps to be disconnected while the engine keeps running during travel or standby.

Trenchers

Trenchers cut narrow trenches in soil or rock for utility lines, pipelines, and drainage systems. They depend on hydraulics to power the cutting chain, auger, and conveyor system with precise control. The pump drive supplies the multiple pumps these functions require.

Harvesting Equipment

Agricultural harvesters for crops such as potatoes, peanuts, corn, blueberries, and other berries are heavily reliant on hydraulics for their auxiliary functions. Pump drives power the pumps behind conveyors, shakers, diggers, and similar systems. Some harvesting implements are powered by a farm tractor, in which case the pump drive uses a tractor PTO input shaft instead of mounting directly to an engine.

Other Common Applications

Pump drives also appear in many other machines, including:

• Hydraulic power units: Stationary engine- or motor-driven units that supply hydraulic power to remote equipment
• Forestry equipment: Chippers, grinders, and processors with hydraulic feed and positioning systems
• Mining and aggregates: Portable crushing and screening plants with hydraulic adjustment and conveyors
• Electric and hybrid machines: Equipment where an electric motor drives the hydraulic pumps

How the Application Shapes Pump Drive Selection

Each application points toward certain pump drive features:

• Number of hydraulic circuits: Determines how many pump pads are needed
• Pump speed requirements: Determines the ratio, whether 1:1, speed increasing, or speed reducing
• Cold starts or standby operation: Favors a clutch input or a live PTO so pumps can be disconnected
• Machine layout: Direct engine mounting favors a drive plate input, while remote mounting favors a shaft input
• Tractor-powered implements: Require a tractor PTO input shaft
• Electric or hybrid power: Calls for a C-face flange input that mounts to an electric motor
• Duty cycle: Continuous or high-load operation may call for higher ratings or added cooling