Using a Stone DC Hydraulic Power Unit for a Portable Bale Lifting Mechanism

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Project Details
Industry: Transportation
Brand Rail Systems

Overview

Agricultural operations require efficient and safe handling of round bales in the field. A portable bale spike lifting mechanism powered by a compact DC hydraulic power unit was implemented to provide controlled lifting, secure load holding, and smooth lowering without reliance on tractor hydraulics. 

The Challenge

An agricultural customer required a lightweight, self-contained hydraulic solution to operate a two-tine bale spike. The system needed to lift, hold, and lower round bales safely while allowing the bale spike to be mounted on a pickup or utility vehicle.
 
Traditional bale handling methods often rely on tractor hydraulics or manual intervention, limiting flexibility and increasing handling time. Uncontrolled lowering and inconsistent load holding also introduced safety risks during bale transport and placement.

Solution Presented

A Stone DC-70BS power unit was integrated into the bale spike mechanism. The unit incorporates a 2-position, 4-way cartridge valve and double pilot-operated check valves, enabling controlled lifting, positive load holding, and smooth, controlled lowering of round bales.
This type of agricultural handling challenge is solved using portable DC hydraulic power units with integrated load-holding valves to deliver independent, safe lifting capability in the field.

Results

The portable bale spike lifting mechanism improved daily handling efficiency and reduced operator effort. Independent DC hydraulic power eliminated dependence on tractor hydraulics and enabled safer, more consistent bale handling across multiple vehicles.
 
Based on typical agricultural handling practices, the DC-powered bale spike system delivered measurable operational benefits:
• Time Savings: Estimated reduction of 1–3 minutes per bale handling cycle by eliminating hydraulic hookups and repositioning.
• Labor Efficiency: At approximately 20 bale lifts per day, this equates to 30–60 minutes of labor saved per day.
• Annual Labor Savings: Assuming a $30–$45 hourly labor rate and 50 operating weeks per year, estimated savings range from $5,000 to $7,500 per unit annually.
• Equipment Utilization: Increased flexibility allowed bale handling on pickups or utility vehicles, improving equipment availability by an estimated 20–40%.
• Safety Cost Avoidance: Controlled lowering and positive load holding reduced the risk of dropped bales, helping avoid material damage and injury-related costs.

Other Applications

• Round bale handling and transport
• Agricultural material handling equipment
• Utility vehicle-mounted lifting attachments
• Portable lifting systems requiring DC power

Key Metrics

System Impact & Engineering Advancements

Performance Metrics & Key Achievements

$7,500 1

Savings/Year

60 2

Min of Labor Savings

3 3

Min Saved per Bale

Improved Safety

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 1. Estimated using a $30-$45 hourly labor rate over 50 operating weeks per year; actual savings vary by local rates and schedule. 
 2. Based on 1-3 minutes saved per bale across roughly 20 lifts per day, equating to an estimated 20-60 minutes saved daily. 
 3. Estimated from eliminating tractor hydraulic hookup and repositioning steps per cycle; not a measured result for this unit. 
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