EP-AG135 Fertilizer Spreader Gearbox – 50HP, 45° Dual Output, Twin-Disc Drive

EP-AG135 Fertilizer Spreader Gearbox 1

★ Perfectly Equal. Perfectly Simultaneous. — The 50HP Twin-Disc Fertiliser Spreader Gearbox Built for Uniform Distribution

Le EP-AG135 drives both discs of a double-disc fertiliser spreader from a single PTO input — equally, simultaneously, and at exactly the same speed. Its 45° dual symmetric output arrangement (297mm centre-to-centre between the two output shafts) delivers identical torque to each disc rotor through matched cone-base spline shafts, ensuring that left and right disc rotation speeds never diverge and that application rate across the full working width remains consistent pass after pass. Rated at 50HP, 540RPM, 1:1 ratio, Module 6.0, 20/20-tooth symmetric bevel gear set, 16.5kg nodular cast iron housing. Supplied by Korea Ever-Power Agricultural Machinery Co., Ltd. to fertiliser spreader OEM manufacturers, agricultural machinery distributors, and farming cooperatives across South Korea, Japan, and Southeast Asia.

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The EP-AG135 — Purpose-Built for Twin-Disc Fertiliser Spreader Accuracy

EP-AG135 fertiliser spreader gearbox 50HP 45 degree dual output twin disc drive Korea Ever-Power

EP-AG135 · 50HP · 1:1 · 45° dual output · 16.5 kg

The agronomic case for uniform fertiliser distribution is well established: uneven application across the working width produces strips of over-fertilised and under-fertilised crop that are visible at harvest and measurable in yield data. In a twin-disc spreader, the gearbox is the upstream component most directly responsible for disc speed uniformity — if one disc receives more torque than the other, it spins faster, throws material further to its side, and creates the lateral asymmetry that the agronomist will track back to the spreader setup rather than the field.

The EP-AG135's design addresses this directly. The 20/20-tooth symmetric gear set with M6.0 module sits centrally in the housing, receiving PTO torque through a single 1 3/8″ Z6 input and distributing it to two output shafts angled at 45° to the input centreline and placed symmetrically at 297mm centre-to-centre. Because both output shafts are driven by the same gear set without any intermediate differential or clutch, they physically cannot rotate at different speeds under steady-state conditions. Any torque variation between left and right that results from disc imbalance, material loading differences, or worn disc paddles is absorbed as gear mesh load variation, not as speed difference — the mechanism enforces synchronisation at the kinematic level.

The 45° shaft angle is not the same geometry problem as the EP-68° unit. Here the 45° serves a completely different purpose: it positions the two output shafts so that each drives its disc rotor at an angle that provides the correct material throw trajectory for the standard twin-disc spreader disc geometry. The 45° angle between input and each output shaft is symmetric, meaning the housing has a true bilateral symmetry axis — a design property that simplifies mounting, ensures equal shaft length from the housing to each disc, and gives the spreader manufacturer a geometrically balanced machine structure without additional frame compensation.

Replacement Reference: The EP-AG135 is engineered as a direct-specification replacement for comparable Rauch, Amazone, Kuhn, and Vicon OEM twin-disc fertiliser spreader gearboxes in the 50HP / 1:1 / 45° dual-output class. Korea Ever-Power is not affiliated with, sponsored by, or an authorised parts distributor for these brands. Model references are provided solely to assist customers in identifying compatible replacement specifications.

Spécifications techniques

All parameters are factory-verified from the official EP-AG135 product datasheet. The 20/20 symmetric tooth count confirms 1:1 ratio — both output shafts turn at exactly 540RPM when PTO input is at 540RPM. Module 6.0 on this 50HP unit uses a larger tooth pitch than the EP-68° (M4.23 at 30HP) because the EP-AG135 distributes torque to two output shafts simultaneously — although each output shaft carries only half the total input torque at any given moment, the gear set must be sized for the combined simultaneous loading, not just one shaft's share.

EP-AG135 Fertilizer Spreader Gearbox Dimension

Paramètre Valeur Technical Notes
Modèle EP-AG135 Special Application Series — twin-disc fertiliser spreader drive
Output Shaft Angle 45° (symmetric dual) Both outputs at 45° to PTO input centreline — symmetric about the housing axis
Rapport de vitesse 1 : 1 Equal speed on both outputs — no reduction or increase
Teeth Count 20 / 20 Symmetric — equal tooth engagement load on both output sides
Module d'engrenage 6.0 Sized for combined dual-output torque load at 50HP
Puissance nominale 50 HP ≈ 37.3 kW continuous — split equally between two outputs
Vitesse d'entrée nominale 540 tr/min Standard agricultural tractor PTO speed
Arbre d'entrée 1 3/8″ Z6 spline ISO 500 standard PTO connection
Output Shafts (×2) Cone-base aequilate spline Both shafts identical — standard spreader disc hub interface
Output Shaft Spacing 297 mm centre-to-centre From engineering drawing: 148.5mm each side of housing centreline
Matériau du boîtier Nodular cast iron (GGG50) Symmetric casting — equal stiffness on both output-shaft sides
Poids net 16.5 kg Compact for 50HP — twin-disc spreader frame integration

agricultural gearbox features 1

Reading the engineering drawing from the original datasheet, the EP-AG135's geometry becomes precise: the housing is 297mm across the output shaft span (148.5mm from centreline to each output), with each output shaft at 45° to the PTO input centreline entering from above. The 56.7mm dimension shown from the housing face to each output shaft centreline confirms the symmetry — both shafts are at equal distance from the housing face, ensuring equal unsupported shaft length to each disc hub and equal bending moment under disc loading.

The PTO input shaft is at the top centre of the housing, with the 1 3/8″ Z6 spline entering vertically (or at the mounting angle of the spreader frame). The two output shafts exit at 45° symmetrically to each side, creating a characteristic "Y" or "V" layout when viewed from above — the most compact and balanced arrangement for a dual-disc drive. The cone-base aequilate spline output termination on both shafts matches the standard disc hub interface used on major European twin-disc spreader designs, making the EP-AG135 a direct-fit replacement on the most common spreader platforms.

Why Synchronous Dual Output Is the Foundation of Spreader Accuracy

Fertiliser application accuracy in twin-disc spreaders depends on three factors: disc speed, paddle angle, and material feed rate. The gearbox controls disc speed — and if disc speed is unequal between left and right, the spreader's calibration curves (which assume equal disc speed) become invalid, producing a systematic asymmetric distribution pattern that shifts with every load cycle as disc wear and material density change.

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Kinematic Speed Lock — Not Electronic

The EP-AG135's single gear set drives both outputs simultaneously from the same gear mesh. This is a kinematic speed lock — both shafts are mechanically constrained to the same rotational relationship with the input gear. Unlike electronic speed-matching systems that correct speed differences after they occur, the single-gear-set design prevents speed differences from occurring in the first place. No sensor, no controller, no calibration drift. The physics of shared gear engagement enforces synchronisation every revolution.

📐

Symmetric Geometry — Equal Shaft Reach

The 148.5mm-each-side symmetric housing places both output shafts at equal distance from the housing centreline. This means identical shaft length from the gearbox to each disc hub, identical bearing-to-disc distance, and identical rotational inertia on each side. When one disc encounters a heavier fertiliser load than the other — as inevitably happens with granule-size variation and hopper flow asymmetry — the equal mechanical geometry ensures the torque response is equal and the speed difference remains zero.

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Consistent Throw Pattern — Every Pass

A twin-disc spreader's throw pattern is calibrated once per product type using the manufacturer's spread chart. That calibration assumes consistent disc speed throughout the application. With synchronous disc drive, the spread pattern is the same on pass 1 and pass 50 — whether the hopper is full or nearly empty, and whether the crop is standing tall or flat. This repeatability is what makes precision variable-rate application possible on ISOBUS-equipped spreaders, where the controller adjusts gate opening but assumes constant disc speed.

Agronomic note for Korean and Japanese grain farmers: Korean government precision farming subsidy programmes and Japan's Smart Agriculture Initiative both emphasise input-use efficiency — fertiliser being the largest variable cost in rice, barley, and vegetable production. Demonstrating uniform application rates through calibrated spreader data is increasingly required for subsidy compliance. A gearbox that enforces disc speed synchronisation simplifies this demonstration because the spread pattern is mechanically consistent rather than electronically corrected.

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Why 45° — The Geometry of the Twin-Disc Throw Pattern

The 45° output shaft angle is not an aesthetic choice or a manufacturing convenience — it is the result of optimising the disc-to-frame mounting geometry for the standard twin-disc spreader throw pattern. Understanding why 45° is correct here requires tracing the relationship between disc shaft angle and material distribution:

① The Spreader Frame Geometry Constraint

The twin-disc spreader frame is mounted on the tractor's 3-point hitch in a roughly horizontal plane above the ground. The PTO input arrives from the front of the spreader (from the tractor PTO shaft above the hitch). The two disc rotors sit below the hopper, on either side of the machine centreline. The gearbox must redirect power from the horizontal-ish PTO input axis to the two disc drive shafts, which are not vertical — they are angled outward and downward from the gearbox housing at approximately 45° to achieve the correct disc face angle relative to the horizontal ground plane.

② The Disc Face Angle & Throw Trajectory

A twin-disc spreader's throw width is determined by the speed at which the paddle tip releases fertiliser granules and the angle of the disc face relative to the ground. At a 45° disc face inclination (achieved when the output shaft is at 45° to horizontal), the centrifugal release trajectory produces the broad, relatively flat spread pattern that gives the standard 24–36m working width at the disc speeds generated by 540RPM PTO input at 1:1 ratio. A steeper shaft angle (closer to vertical) narrows the spread; a shallower angle (closer to horizontal) widens the inner pattern at the expense of the outer edge.

③ The 45° Result — Maximum Working Width Per HP

At 45° shaft angle, 540RPM output speed, and the standard disc diameter used in large-format twin-disc spreaders (typically 460–520mm), the paddle tip velocity produces a throw range of 12–18m per disc side — yielding a total working width of 24–36m depending on material density and paddle configuration. This is the widest working width achievable with a PTO-driven spreader at 50HP input, making the 45° geometry the correct specification for large commercial spreader designs. The EP-AG135's geometry is matched to this target from the ground up.

EP-AG135 vs. EP-68° — Choosing the Right Angle-Drive Gearbox

Korea Ever-Power produces two non-right-angle agricultural gearboxes. They share the principle of a non-90° shaft arrangement but serve completely different application categories and should not be confused:

Factor EP-AG135 (this product) EP-68°
Shaft Angle 45° — dual symmetric 68° — single output
Number of Outputs Two (left + right, equal) One
Puissance nominale 50 HP 30 HP
Module d'engrenage M6.0 (standard series) M4.23 (custom for 68°)
Poids net 16.5 kg 13.2 kg
Primary Application Twin-disc fertiliser spreaders requiring symmetric dual drive Inclined-frame implements requiring non-right-angle single drive
Interface de sortie Cone-base aequilate spline (both) Spline (single)

If your application requires a single output at a non-right angle, see the EP-68° product page. If it requires two equal-speed outputs for a twin-disc rotor system, the EP-AG135 is the correct model. Contact Korea Ever-Power if your dual-output requirement involves a different shaft angle or a non-1:1 ratio — custom specifications are available for sufficient volume.

Construction & Material Quality

🏗️

Symmetric GGG50 Housing

The housing is bilaterally symmetric about the PTO input axis — equal wall thickness, equal bearing bore positions, and equal rib geometry on both output-shaft sides. This symmetry is not merely aesthetic: asymmetric housing stiffness under load would produce different deflections on the left and right gear mesh contact zones, eventually causing unequal tooth wear rates between the two sides of the common input gear. The symmetric casting eliminates this failure mechanism from the start.

⚙️

M6.0 Hardened Bevel Gears

The 20/20-tooth bevel gear set at Module 6.0 is carburised to 0.8–1.2mm case depth and quench-hardened to HRC 58–62. At 1:1 ratio driving two outputs simultaneously, the input gear carries the combined torque of both disc loads before distributing it. The M6.0 tooth cross-section provides the root bending strength for this combined load, while the symmetric 20-tooth arrangement on both output sides prevents load concentration on one flank.

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Dual-Seal Fertiliser-Resistant Shaft Exits

Fertiliser spreaders operate in an aggressive environment — ammonium nitrate, urea, potassium chloride, and compound NPK granules all produce hygroscopic dust that infiltrates machinery gaps and dissolves into a corrosive slurry in the presence of moisture. The EP-AG135's output shaft exits use double-lip NBR seals with an additional dust-exclusion lip — three-layer protection at both output shafts — to prevent fertiliser-contaminated material from reaching the bearing races during spreading operation.

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Corrosion-Resistant Surface Treatment

The external housing surface is treated with a corrosion-resistant coating compatible with the fertiliser environment. Granular fertilisers that contact the housing during filling or spreading do not cause accelerated surface corrosion that would eventually compromise the housing integrity. The cone-base spline output shafts are manufactured from case-hardened alloy steel with surface finish appropriate for the corrosive environment of fertiliser dust exposure during disc hub fitting and removal.

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Cone-Base Spline Output — Self-Centring Disc Hubs

The cone-base aequilate spline shaft termination on both outputs is the industry standard for twin-disc spreader disc hub attachment. The tapered cone engagement self-centres the disc hub during assembly, providing repeatable concentricity between the disc face and the shaft centreline at every disc removal and refitting. This matters for spreader calibration: an off-centre disc changes the effective throw radius and invalidates the spread chart without producing any obvious noise or vibration signal.

✅

Load Test — Both Outputs Simultaneously

Every EP-AG135 is bench-tested at full 50HP rated load with both output shafts loaded simultaneously — not sequentially. A test that loads only one output at a time does not verify the housing stiffness and gear mesh condition under the actual symmetric dual-load condition of spreader operation. The simultaneous load test confirms gear contact pattern, bearing temperature, and oil seal integrity under the condition the unit will experience in service.

Where the EP-AG135 Is Used

🌾 Granular Fertiliser Application — Korean Grain & Vegetable Farms

South Korea's grain production regions — rice in Jeolla and Chungnam, barley and wheat in Gyeongbuk, and corn in Gangwon — apply base fertiliser (typically compound NPK 20-20-0 or 16-16-16) at spring planting using tractor-mounted twin-disc spreaders on 45–55HP compact and utility tractors. The EP-AG135 is the gearbox specified on the South Korean OEM spreader models sold into this market: at 50HP and 540RPM, it matches the PTO output of the dominant Korean tractor models (Daedong DK, LS MT, TYM T403) while providing the synchronous dual-disc drive that prevents the skewed application patterns that show up in subsequent soil sampling and yield maps.

🍚 Paddy Field Fertilisation — Japan & Vietnam

Japanese paddy rice production in Niigata, Akita, and Yamagata prefectures uses top-dressing fertiliser application — applying nitrogen at tillering stage using air-blast spreaders and twin-disc ground spreaders on the paddy bunds and adjacent upland areas. The EP-AG135 is used on the ground spreader systems operating on the elevated bund paths between paddy plots, where the 50HP capacity and compact 16.5kg weight allow the spreader to be mounted on compact tractors that must navigate narrow bund turns. In the Mekong Delta, Vietnam's rice farmers increasingly adopt twin-disc spreaders for paddy fertilisation over the traditional broadcast-by-hand method — the EP-AG135 suits the locally available 40–55HP Chinese and Korean tractors.

🌴 Plantation Crop Fertilisation — Southeast Asia

Oil palm, rubber, and sugarcane plantations in Malaysia, Indonesia, and Thailand apply large quantities of granular fertiliser — typically 200–400 kg/ha per application cycle — to established stands using twin-disc spreaders. These operations run large-format spreaders on 60–80HP tractors, but the EP-AG135's 50HP rating covers the majority of plantation tractor spreader combinations used on smaller-block operations and contract spreading services. The synchronous disc drive is particularly valued here because plantation fertiliser application is often done under time pressure at critical crop growth stages, leaving no tolerance for repeat passes to correct asymmetric distribution.

🏭 OEM Fertiliser Spreader Manufacturing — Korea & Japan

Korean agricultural machinery manufacturers in South Gyeongsang and Gyeonggi provinces build twin-disc fertiliser spreaders for domestic sale and export to Southeast Asia, the Middle East, and Eastern Europe. The EP-AG135 is the standard gearbox specified by Korea Ever-Power's OEM customers in this sector because the cone-base spline output terminations match the disc hub standards used on the European spreader designs that serve as engineering references for Korean-built machines. Korea Ever-Power supplies OEM customers with dimensional certification, consistent batch quality, and dedicated stock allocation — contact our technical sales team for OEM programme details.

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Fertiliser Spreader Gearbox Maintenance — Unique Considerations

Fertiliser spreader gearboxes operate in a uniquely aggressive environment compared to mower and tiller gearboxes — hygroscopic fertiliser dust, repeated wash-down with water, and chemical contact with ammonium and nitrate compounds all accelerate wear and corrosion if the maintenance programme does not account for them. The following practices apply specifically to the EP-AG135 in spreader service:

After Each Use:Remove disc hubs and wash fertiliser residue from the output shaft spline area with clean water. Dry thoroughly before storage — do not leave fertiliser residue on the cone-base spline surface, as fertiliser salts accelerate fretting corrosion on the spline contact faces. Apply a light coat of anti-seize compound to the spline before refitting hubs.

Oil Check (every 50 hours or start of season):Check gear oil level and colour. Milky or watery oil indicates water ingress through a seal failure — a risk in spreader service because wash-down water can be directed at the seal lips. Replace seals immediately if water contamination is found; operating with water-contaminated gear oil for more than a few hours causes bearing corrosion that cannot be reversed.

Seasonal Storage:Before end-of-season storage, drain and replace gear oil with fresh SAE 90 GL-4. This removes acidic degradation products from the fertiliser season's operation. Clean all external surfaces thoroughly, remove disc hubs, and store the gearbox in a covered, dry location. A light spray of water-displacing rust inhibitor on the output splines during storage prevents the surface oxidation that makes disc hub removal difficult at the start of the next season.

Warning:Never pressure-wash the gearbox housing with the disc hubs removed — high-pressure water directed at the exposed output shaft seal lips can force water past the seal lip and into the bearing. Hand-wash with low-pressure water and a brush, or use the tractor's low-pressure wash system only.

Why Fertiliser Spreader Manufacturers Choose Korea Ever-Power

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Symmetric housing production — bilateral CNC machining for equal output geometry

Producing the EP-AG135's symmetric dual-output housing requires machining both output-shaft bearing bores in a single clamping operation — the only way to guarantee equal bore alignment relative to the input shaft axis. Korea Ever-Power Agricultural Machinery Co., Ltd.'s CNC machining capability includes the multi-axis fixturing required for this operation across the full HC series housing range. This is not a process adaptation; it is a designed production step that has been part of the EP-AG135 manufacturing workflow since the product was introduced.

For Korean fertiliser spreader manufacturers and Southeast Asian agricultural machinery distributors, Korea Ever-Power provides 3–7 business day delivery from regional stock — significantly shorter than the 6–10 week lead time for equivalent European OEM replacement parts. Complete export documentation prepared for every shipment supports smooth customs clearance under RCEP and applicable ASEAN preferential tariff agreements.

✔ Single-clamp CNC machining for bilateral bore symmetry
✔ Simultaneous dual-output load test at full 50HP
✔ Fertiliser-resistant triple-lip output shaft seals
✔ 3–7 day dispatch to Korea, Japan & SEA from stock
✔ OEM supply: volume pricing, dimensional certification
✔ 19 years manufacturing — >95% export, global track record

Related Products & Drive Components

🔩 PTO Drive Shafts

The connection between tractor PTO and EP-AG135 input. We supply arbres de transmission de prise de force in lengths and guard configurations suitable for fertiliser spreader mounting — including wide-angle joints for spreaders with significant 3-point hitch lift travel that changes the PTO shaft angle during field operation.

→ cvjointdriveshaft.com

📐 EP-68° Single-Output Angle Gearbox

For applications requiring a single output at a non-right angle — inclined mower decks, oblique conveyor drives, compact-clearance installations — the EP-68° provides a 68° single-output drive at 30HP, 1:1 ratio. See the EP-68° product page for the geometric scenarios where it solves problems the EP-AG135 is not designed for.

🌾 Full Special Application Range

Browse Korea Ever-Power's complete range of special application agricultural gearboxes — including round baler drives, disc mower spindles, vertical-shaft units, and multi-angle drive configurations for the full range of specialised implement drive requirements.

→ agriculturalgear-boxes.com

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What Customers Say About the EP-AG135

Han Seong-yeon Spreader OEM Manufacturer · Gimhae, South Gyeongsang, South Korea · 2024

We build twin-disc fertiliser spreaders for the Korean market and export to Vietnam and the Philippines. The EP-AG135 became our standard gearbox 14 months ago after we had recurring issues with the European unit we previously used — specifically the output spline interface corroding after one season in high-humidity conditions. The EP-AG135's fertiliser-environment sealing is noticeably better. We've shipped 80 spreaders with this gearbox and had zero gearbox-related warranty claims. The cone-base spline output matches our disc hub specification without any modification. Korea Ever-Power OEM lead time is consistently 4–5 days — critical for our production schedule.

Yamashita Kenji Agricultural Cooperative Equipment Manager · Niigata Prefecture, Japan · 2024

Our cooperative manages fertiliser application for about 320 hectares of paddy rice in Niigata. We replaced the gearbox on our primary twin-disc spreader last spring with the EP-AG135. The disc speed uniformity was the reason — our previous unit had developed a slight asymmetry after 600 hours of use that showed up in the spread pattern and was confirmed by spread table testing. After fitting the EP-AG135, the spread table results came back symmetric. Two full application seasons later, still symmetric. The gear oil was clean at the 200-hour check — no unusual metallic content. Very satisfied.

Nguyen Quoc Bao Agricultural Machinery Dealer · Can Tho, Mekong Delta, Vietnam · early 2025

I sell spreaders and replacement parts to rice farmers in the delta. The EP-AG135 is now my standard replacement gearbox for European-brand spreaders whose original gearboxes have worn out or been damaged. Most of my customers' spreaders have the same cone-base spline disc hub standard as the EP-AG135 output. Fit has been correct on every unit. The spreader season here is intense — three crops a year means three application cycles, and the equipment runs hard. I've placed three orders over eight months. Lead time from Korea Ever-Power: 6 days to Can Tho. Documentation correct for Vietnamese customs on every shipment.

Pramote Sangsuk Oil Palm Plantation Equipment Manager · Surat Thani, Thailand · 2025

We manage fertiliser application across 1,800 hectares of oil palm in Surat Thani. Application rate uniformity is critical for palm yield — the trees are spaced to a precise geometry and application asymmetry produces detectable yield variation within 18 months. We were using a European gearbox that required annual replacement because of seal failure in our wash-down routine. The EP-AG135 has survived our wash-down procedures — we've been applying similar wash pressure for four months and the seals are holding. If they hold through the full season, this gearbox will be our standard specification across all spreaders.

Kim Dae-jung Precision Farming Contractor · Iksan, North Jeolla, South Korea · 2024

I run variable-rate fertiliser application services for about 200 farm clients in Jeolla. My spreader is ISOBUS-connected and the controller adjusts gate opening for variable rate — but it assumes constant disc speed. Any gearbox asymmetry feeds directly into application errors that my clients can see in their yield data. I changed to the EP-AG135 last season. The spread pattern has been consistent across 180 hectares of application with no asymmetry detected in any of the verification spread tests I run for each client. The price was significantly lower than the OEM replacement part and the lead time was 4 days from my order. I plan to fit it on my second spreader before next season.

Frequently Asked Questions — EP-AG135

Does the EP-AG135 truly guarantee equal disc speed, or can one disc run faster than the other?

Under steady-state operating conditions with a functioning gear set, yes — the kinematic speed constraint of the shared gear mesh physically prevents one output shaft from rotating at a different speed from the other. Both shafts are driven by the same input gear through equivalent tooth engagement. The only scenario where disc speeds could diverge is if the gear set fails (tooth fracture or total wear) — in which case one output shaft would become disconnected. In normal service at rated load, equal disc speed is guaranteed by the mechanism, not by software or sensor.

Will the EP-AG135 fit my Rauch, Amazone, Kuhn, or Vicon twin-disc spreader?

The cone-base aequilate spline output shafts are the standard interface used across the major European twin-disc spreader brands. For most spreaders using this output termination at 50HP and 540RPM, the EP-AG135 is a direct gearbox replacement. You should verify the output shaft spacing (EP-AG135: 297mm centre-to-centre) against your spreader's disc hub mounting centres, and confirm the input shaft specification (1 3/8″ Z6) matches your PTO shaft. Send us your spreader make, model, and year — we can confirm compatibility before you order. Korea Ever-Power is not affiliated with or an authorised parts supplier for Rauch, Amazone, Kuhn, or Vicon.

My spreader operates at 1000RPM PTO — is the EP-AG135 compatible?

No. The EP-AG135 is rated for 540RPM PTO input. Operating at 1000RPM would result in disc speeds of 1000RPM — nearly double the calibrated application speed. The centrifugal force at 1000RPM disc speed would throw fertiliser significantly further than the spreader's calibrated working width and in a flatter trajectory, causing serious over-application in the outer zones and potential field boundary contamination. Additionally, the gear and bearing loads at 1000RPM at 50HP would exceed the design specification. If your tractor uses 1000RPM PTO for spreader operation, contact Korea Ever-Power — there may be a speed-reduction adapter option or a different specification model for your requirement.

What gear oil does the EP-AG135 use and how often should it be changed in fertiliser spreader service?

SAE 90 GL-4 gear oil, approximately 250–300ml. Because fertiliser spreaders are used seasonally — typically 200–600 hours per year spread across spring and autumn application campaigns — we recommend changing the gear oil at the start of each season rather than at fixed hour intervals. The seasonal change removes any water or fertiliser-acid contamination that has accumulated during the previous season's wash-downs. At each seasonal oil change, inspect the drain oil: milky oil (water) or unusual odour (fertiliser acid) indicates a seal failure that needs immediate attention before the new season begins.

Can the EP-AG135 be used as a single-output gearbox by blocking one output shaft?

Mechanically possible but not recommended. If one output shaft is blocked (by not fitting a disc hub and leaving the shaft unused), all 50HP input torque is carried by one output gear mesh instead of being shared equally between two. The gear mesh on the active side will carry double its designed load, significantly accelerating wear. The bearing on the blocked-shaft side will also experience abnormal thrust loads from the unbalanced gear mesh. If you need a single-output drive, the EP-68° or an appropriate mower-series gearbox is the correct specification.

How do I remove a stuck disc hub from the cone-base spline shaft?

Cone-base spline hubs can seize on the shaft taper if fertiliser residue has caused fretting corrosion on the contact faces — particularly with ammonium nitrate or calcium ammonium nitrate products. Do not use an impact hammer directly on the hub — this can crack the hub or damage the shaft taper. Use a dedicated hub puller designed for the cone taper dimension of your spreader's disc hubs. Before the next fitting, clean the shaft taper and hub bore thoroughly, apply a light coat of copper-based anti-seize compound, and ensure the hub retaining nut is correctly torqued. Contact Korea Ever-Power if you need shaft taper dimensions for a puller specification.

What warranty and shipping options apply to the EP-AG135?

12-month warranty from dispatch against manufacturing defects covering both output sides: housing defects, gear tooth failure within 50HP rated load on both outputs simultaneously, bearing failure not caused by water contamination or oil starvation, and seal defects present at delivery. Not covered: water ingress caused by pressure-washing with disc hubs removed, operation at 1000RPM input, fertiliser corrosion damage to external surfaces (a maintenance item), or single-output operation causing overload on one gear mesh. Shipping: DHL or FedEx for 1–5 units (3–5 days Korea/Japan; 5–7 days SEA). Sea freight LCL for 10+ units (10–18 days). Full RCEP/ASEAN-compliant export documentation on every shipment.

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