EP-HMP150 Heavy-Duty Multi-Purpose Gearbox — 150 KW Industrial-Grade Tillage Drive

EP-HMP150 Heavy-Duty Multi-Purpose Gearbox — Product Overview

The Flagship for Large-Scale Operations

When Korean agricultural enterprises, government land-management agencies, and large-scale contract tillage operators need an intermediate gearbox that can handle 135–200 HP tractors running 3-meter-wide rotary tillers at sustained full load, the EP-HMP150 heavy-duty multi-purpose gearbox is the answer. At 150 KW continuous rated power, it is the most powerful rotary cultivator gearbox in Korea Ever-Power’s multi-purpose family — designed to work where lighter gearboxes reach their thermal and structural limits.

Industrial-Grade Spline Architecture

The EP-HMP150 uses an oversized Ø54×Ø48 spline input (8-9 tooth configuration) paired with an M3Z22 involute spline output — both significantly larger than the interfaces on the mid-range EP-MMP100. The 3.0 mm module, 22-tooth involute output profile distributes the amplified torque from the 1.54 : 1 reduction across generous tooth contact area, keeping individual tooth loads within the fatigue endurance limit of the hardened spline material even at sustained 150 KW operation.

Top Tier of a Scalable Family

The EP-HMP150 completes Korea Ever-Power’s three-tier multi-purpose gearbox family — above the entry-level EP-LMP70 (40–70 KW) and the mid-range EP-MMP100 medium multi-purpose intermediate gearbox (80–100 KW). All three share the same 1.533–1.54 : 1 ratio range, giving fleet operators a single output speed (approximately 351–352 rpm) across their entire tractor fleet regardless of horsepower class.

Full Technical Specifications

All specifications verified against the Korea Ever-Power engineering drawing for the EP-HMP150 (catalog reference P06). Dimensional values measured at 20°C ambient, no-load condition.

Heavy-Duty Engineering — What Makes 150 KW Possible

Thermal Capacity Design

At 150 KW, the EP-HMP150 generates significantly more heat through gear mesh friction than lighter gearboxes. Korea Ever-Power addresses this with a 3.0-liter oil bath capacity (versus 1.2 L in the EP-LMP70 and 2.0 L in the EP-MMP100), providing a larger thermal mass to absorb heat during peak-load transients. The HT250 cast-iron housing also acts as a heat sink, with 363 mm of external width providing generous surface area for convective cooling in ambient airflow during field operation. Continuous operation at rated load keeps oil temperature below 90°C even in 35°C ambient summer conditions.

Oversized Bearing Package

The EP-HMP150 uses taper roller bearings one size class larger than the torque calculation alone demands. This deliberate over-engineering provides a bearing L10 life rating of approximately 8,000 hours at rated load — roughly four to five full tillage seasons for a commercial operator running 1,500–2,000 hours per year. The oversized bearings also increase the gearbox’s tolerance to momentary overloads, such as the torque spikes generated when tiller blades strike buried rocks or compacted root balls at full operating speed.

Wide-Base Housing Geometry

The 363 mm housing width with 8-M12 mounting bolts on Ø216 PCD distributes the reaction torque across a much larger bolt circle than lighter gearboxes use. This wide-base geometry prevents housing flex under peak load — a critical factor at 150 KW, where even microscopic housing distortion can cause bearing misalignment and accelerate gear tooth pitting. The 8-bolt pattern (versus 6 bolts on the EP-LMP70) provides 33% more clamping force for the same bolt grade, eliminating any risk of bolt fatigue failure under sustained heavy-duty use.

Complete Multi-Purpose Series Comparison

The EP-HMP150 anchors the top of Korea Ever-Power’s three-tier multi-purpose gearbox family. All three models target the same output speed range (351–352 rpm from 540 rpm PTO) but scale in power capacity, spline strength, and housing rigidity. This table shows exactly where the EP-HMP150 fits and why it is the right choice for high-power operations.

Key Dimensions & Mounting Interface

Field Application Scenarios

Large-Scale Commercial Grain Farms

Korean agricultural enterprises operating 50–200+ hectares of rice, corn, or soybean fields run 150–200 HP tractors with wide-swath rotary tillers (2.5–3.5 meter working width). These implements generate sustained power demands of 120–150 KW during spring soil preparation, especially in heavy clay paddy soil. The EP-HMP150 is engineered to absorb this full load continuously without thermal degradation — its 3.0 L oil capacity and 363 mm housing width provide sufficient thermal mass and convective cooling surface area for all-day operation.

Government & Cooperative Land Management

Government agricultural agencies and regional cooperatives managing community farmland, flood plain restoration, or fallow field reclamation deploy high-horsepower tractors on heavy-duty tillage programs. These operations prioritize reliability and standardization over cost — the EP-HMP150’s industrial-grade build quality and 12-month warranty align with institutional procurement standards and multi-year maintenance budgeting.

High-Power Contract Tillage Fleets

Professional contract tillage companies running fleets of 150–200 HP tractors accumulate 1,500–2,000 operating hours per year on each machine. The EP-HMP150’s oversized bearing package (rated L10 life of approximately 8,000 hours) ensures the gearbox outlasts four to five full seasons before bearing service is required — aligning the gearbox maintenance cycle with the tractor’s own major service intervals and reducing unplanned downtime to near zero.

Why Choose the EP-HMP150 for High-Power Operations

Installation & Commissioning

Mounting Procedure

❶ Verify the implement’s input bore matches the EP-HMP150’s M3Z22 involute output spline. Slide the output spline into the implement hub until full engagement depth is confirmed.

❷ Insert all eight M12 mounting bolts through the Ø216 PCD flange. Torque to 95 N·m in a star pattern. Re-check torque after the first 8 operating hours.

❸ Connect the PTO drive shaft to the Ø54×Ø48 spline input boss. Verify full spline engagement and install the shaft safety guard.

❹ Fill gear oil (SAE 80W-90 GL-5) through the breather port — approximately 3.0 liters until oil reaches the sight glass center.

❺ Run a 10-minute idle test at low PTO speed (300 rpm). At 150 KW rating, the commissioning test is extended to verify bearing temperature stabilization. Confirm no abnormal noise, no oil seepage, and stable bearing temperature before engaging full field load.

Maintenance Schedule

◆ Before every work session — Check oil level at sight glass; inspect seals and all eight flange bolts.

◆ After first 100 hours — First oil change: drain, flush, refill with fresh SAE 80W-90 GL-5.

◆ Every 500 hours / annually — Full oil change; inspect magnetic drain plug for metallic debris.

◆ Every 1,000 hours — Inspect both input and output splines for fretting; check all bolt torques; examine breather valve.

◆ Every 4,000 hours — Bearing condition assessment: measure axial play and re-shim if needed. This is unique to the EP-HMP150 due to its higher continuous load.

Companion Products & Driveline Components

The EP-HMP150 anchors the most demanding tillage drivelines. Korea Ever-Power also supplies the companion components that complete the power path from tractor to implement:

Heavy-Duty PTO Drive Shafts

At 150 KW, the PTO drive shaft must be rated for correspondingly higher torque. Korea Ever-Power supplies heavy-duty cardan shafts with wide-angle CV joints and oversized spline profiles matched to the Ø54×Ø48 input. Full-length safety guards and integrated torque limiters are available for institutional and fleet applications.

Seasonal Gearbox Pairings

Large tractors running the EP-HMP150 for tillage often drive round baler gearbox assemblies during straw season. Korea Ever-Power manufactures baler speed-increaser gearboxes rated from 70 to 100 KW. For auxiliary drives such as fertilizer spreaders or large seed drills, a worm gear reducer provides self-locking holding torque without a separate brake mechanism.

Frequently Asked Questions

Customer Reviews & Field Reports