EP-MDH Vertical Shaft Mower Spindle Gearbox – MDH-40 (Square Flange) & MDH-65 (Hex Flange)

EP-MDH Vertical Shaft Mower Spindle Gearbox 1

★ The Spindle That Carries the Blade — EP-MDH-40 & EP-MDH-65 Vertical Shaft Mower Hub Gearboxes

The EP-MDH series is not a PTO input gearbox — it is the blade-drive spindle hub that sits between the disc mower deck plate and the rotating blade assembly. The EP-MDH-40 uses a square 4-bolt flange (178×178mm bolt centres) for straightforward bolted mounting into a mower deck plate. The EP-MDH-65 uses a six-bolt hexagonal flange (Φ250mm outer, Φ139.7mm bolt circle) for higher-load applications and mower decks requiring a larger bearing span. Both units receive rotational drive from the mower deck’s internal cross-shaft bevel drive system and deliver it downward through the vertical spindle to the blade carrier — the critical structural and mechanical link in every disc mower’s cutting system. Korea Ever-Power supplies the EP-MDH series to disc mower OEM manufacturers, mower deck fabricators, and agricultural machinery workshops across South Korea, Japan, and the wider Asia-Pacific region.

Category: Special Application Gearboxes

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What Is a Mower Spindle Gearbox — and How Does It Differ from a PTO Gearbox?

EP-MDH-40 EP-MDH-65 vertical shaft mower spindle gearbox disc mower blade hub Korea Ever-Power

EP-MDH-40 (left) · EP-MDH-65 (right) · vertical spindle hub units

Most discussions of agricultural gearboxes focus on the PTO input gearbox — the unit that receives power from the tractor and redirects it to the implement. The EP-MDH series plays a different role in the mower drive chain. It is the spindle hub: the bearing and housing assembly that sits at each blade position on the mower deck, supporting the vertical blade shaft against the centrifugal loads, grass drag, and occasional ground contact that occur during mowing operation.

In a typical multi-disc mower deck, power flows from the tractor PTO through a primary input gearbox (such as the EP-LF205 or EP-RC31 series), then laterally through the deck's internal cross-shaft drive — a series of bevel gears or belt drives running the length of the deck — to each disc position. At each disc position, a spindle gearbox like the EP-MDH-40 or EP-MDH-65 receives the lateral drive and converts it to vertical rotation for the blade. The spindle unit must simultaneously: transmit the drive torque to the blade, carry the blade's weight and centrifugal radial load on its bearings, and maintain blade height precisely through the structural rigidity of its mounting flange.

The EP-MDH-40 and EP-MDH-65 differ primarily in their flange size and load capacity. The EP-MDH-40's square 4-bolt flange suits compact mower decks with thinner structural plate, where the square bolt pattern provides even clamping across the deck panel. The EP-MDH-65's larger hexagonal 6-bolt flange distributes the blade load across a wider footprint, making it appropriate for wider, heavier-duty mower decks and applications where higher blade tip mass or impact loads are anticipated — such as mowing thicker grass species, cutting on uneven terrain, or operating at the higher blade speeds used in some European-style multi-disc mower designs.

Important distinction: The EP-MDH series units do not have a separate PTO input — they are driven by the mower deck's internal cross-shaft system. When ordering, confirm whether your mower deck uses a compatible cross-shaft drive input profile that engages with the EP-MDH spindle top socket. Korea Ever-Power can provide dimensional drawings of the top drive socket for verification against your deck's cross-shaft output before you order.

Technical Specifications — EP-MDH-40 vs EP-MDH-65

Unlike PTO input gearboxes, mower spindle units are not characterised by HP rating or speed ratio — they are specified by their mounting flange dimensions, hub bore geometry, spindle shaft dimensions, and bearing load capacity. The table below presents the key dimensional parameters extracted from the official engineering drawings for both EP-MDH models.

EP-MDH Vertical Shaft Mower Spindle Gearbox Dimension

Parameter	EP-MDH-40	EP-MDH-65
Flange Type	Square 4-bolt	Hexagonal 6-bolt
Flange Bolt Circle	2×178mm (square centres)	Φ139.7mm PCD
Flange Outer Diameter	Φ101.55mm hub OD	Φ250mm outer
Bolt Count	4× Φ18.5mm + 6× Φ14.3mm	6× Φ20mm + 2× Φ17.5mm
Spindle Hub OD	Φ133.5mm ×2 (stepped)	Φ99mm
Spindle Bore (top drive)	Φ35.5mm ×2	Φ41mm
Lower Blade Shaft OD	Φ32mm (from drawing)	Φ27mm / Φ32mm (stepped)
Housing Height	≈ 170mm	125mm + 102mm (two-section)
Housing Material	Nodular cast iron (GGG50) — both models
Mounting Plate Span	128mm × 89.8mm flange face	Φ250mm flange face
Primary Application	Compact disc mowers, standard deck plate thickness	Wide/heavy-duty disc mowers, high-load blade positions

Reading the engineering drawings for both models reveals the fundamental structural logic of the mower spindle design. Both EP-MDH units use a dual-bearing arrangement — upper and lower bearings separated by the full housing height — to manage the bending moments imposed by the rotating blade assembly. A single bearing cannot adequately constrain a blade spindle under lateral load: the centrifugal force of the spinning blade creates a gyroscopic moment that tends to tilt the spindle from vertical, and this tilt must be resisted by a moment couple — which requires two bearings separated by a meaningful distance.

The EP-MDH-65's two-section housing (125mm upper + 102mm lower) provides an effective bearing span of approximately 200mm — significantly greater than the EP-MDH-40's single-section height of ~170mm. This longer bearing span reduces the radial force on each individual bearing for the same blade moment, extending bearing life and reducing the maintenance interval on heavy-duty mower decks where the blade loads are higher. The hexagonal flange's Φ250mm outer diameter further increases the moment of resistance at the deck plate mounting interface, preventing the flange-face fretting that can develop on smaller-flange spindles mounted to flexible deck plate structures.

The Disc Mower Drive Chain — Where the EP-MDH Fits

Understanding where the EP-MDH spindle sits in the complete disc mower drive chain helps confirm whether it is the component you need to replace or specify:

DRIVE CHAIN

Tractor PTO → Primary Input Gearbox

e.g. EP-LF205 or EP-RC31 — redirects PTO power into the mower deck at the correct shaft angle. This is the gearbox most customers associate with "the mower gearbox."

Primary Gearbox → Cross-Shaft Drive

The lateral bevel gear or belt drive running through the length of the mower deck, distributing rotation to each disc position. This is internal to the mower deck structure and not supplied by Korea Ever-Power as a separate component.

Cross-Shaft → EP-MDH Spindle Gearbox ← YOU ARE HERE

The EP-MDH-40 or EP-MDH-65 receives drive from the cross-shaft at its top socket and converts it to vertical rotation. The spindle housing mounts to the deck plate via the flange, and the lower shaft carries the blade carrier assembly.

Spindle → Blade Carrier → Cutting Blades

The rotating blade carrier and free-swinging blade knives — the final output of the entire drive chain, producing the cutting action at ground level.

When one of the disc positions stops to rotate or rotates at reduced speed, the fault may be in the primary input gearbox, the cross-shaft, or the EP-MDH spindle. The spindle is typically the first component to show wear because it operates at the highest rotational speed with direct exposure to ground contact loads. Korea Ever-Power supplies the EP-MDH series as direct replacement spindle units — the most common mower deck repair category in Korean and Japanese agricultural workshop experience.

EP-MDH-40 vs EP-MDH-65 — Selecting the Right Spindle for Your Mower Deck

The choice between EP-MDH-40 and EP-MDH-65 is determined by your mower deck's existing spindle mounting dimensions and the blade load requirements of the application. Here is a practical guide:

EP-MDH Vertical Shaft Mower Spindle Gearbox 1

EP-MDH-40

Square flange · Compact duty · Standard disc mowers

Choose EP-MDH-40 when:

→ Your mower deck uses a square 4-bolt spindle flange pattern with ≈178mm bolt centres
→ The existing spindle hub OD is approximately Φ101–Φ133mm
→ Mower working width is 1.2–1.8m (2–3 disc positions)
→ Operating in Korean orchard alleys, small-farm plots, or roadside maintenance where a compact spindle profile is needed
→ You are replacing a worn spindle on a compact mower with an existing square flange bolt holes

EP-MDH-65

Hex flange · Heavy duty · Wide mower decks

Choose EP-MDH-65 when:

→ Your mower deck uses a hexagonal 6-bolt spindle flange with Φ139.7mm bolt circle and Φ250mm outer flange
→ The existing spindle hub OD is approximately Φ99mm
→ Mower working width is 1.8–2.5m (3–5 disc positions) requiring higher bearing span
→ Operating in dense or heavy grass where blade drag loads are high, or in conditions involving frequent light ground contact
→ You are replacing a spindle on a wide-format mower with an existing hex flange bolt holes

Before ordering: Measure the bolt circle diameter, bolt count, and spindle hub OD on your existing mower deck. Do not assume EP-MDH-40 or EP-MDH-65 based on visual inspection alone — the two models are not interchangeable on a given mower deck. Send Korea Ever-Power the measurements or the original spindle model number and we will confirm the correct EP-MDH variant before you order.

Construction Quality — What Makes a Spindle Gearbox Last in Disc Mower Service

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GGG50 Nodular Iron Housing

The housing must resist the intermittent impact loads of blade-to-ground contact — unavoidable in mowing operations on uneven terrain. GGG50 ductile iron absorbs these peak loads through micro-deformation rather than fracture, the same material and reason used across all HC/EP series agricultural gearboxes. A grey iron or fabricated steel housing would be brittle under these impact conditions.

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Dual Pre-Loaded Bearing Set

Both EP-MDH models use upper and lower bearing sets with defined pre-load to manage the combination of radial (blade centrifugal) and axial (blade weight) loads. The bearing pre-load is set at assembly and verified under rotation before dispatch — pre-load that is too low allows spindle wobble at blade speed; pre-load that is too high causes bearing overheating and premature race wear.

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Precision-Ground Flange Face

The mating face between the EP-MDH flange and the mower deck plate is ground to flatness tolerances that ensure the spindle axis is truly perpendicular to the deck plate surface. A flange face that is not flat causes the spindle to run at a slight angle to vertical, producing the characteristic oscillating vibration — often felt as a deck-level buzz — that indicates spindle misalignment in disc mowers.

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Grass & Debris-Resistant Sealing

Disc mower spindles operate at ground level in the most contaminated zone of any agricultural drive component — cut grass, soil, crop residue, and stones all contact the lower spindle shaft and housing. The EP-MDH sealing design uses reinforced lip seals at the lower shaft exit with a scraper ring ahead of the primary seal lip to deflect fibrous grass material that would otherwise wrap around the shaft and force past the seal.

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Hardened Spindle Shaft

The vertical blade spindle shaft is surface-hardened at the bearing contact zones and blade-carrier mounting area. The hardening is targeted at the fretting-wear locations — the points where blade carrier clamps, blade carrier locking keys, and bearing inner races contact the shaft surface over thousands of operating hours. Fretting at these points is the primary mechanism of spindle shaft wear in mower service.

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Rotation Test Before Dispatch

Every EP-MDH unit is spun under load before packaging to verify bearing pre-load, seal integrity, and shaft runout. Runout is checked with a dial indicator at the lower blade-carrier seat — any unit showing more than 0.05mm total indicator reading is rebuilt before dispatch. Blade carriers mounted on an out-of-true spindle produce vibration that shortens blade carrier bolt life and amplifies the blade impact load.

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Where EP-MDH Spindles Are Used — Disc Mower Applications Across Korea & Asia

🌿 Hay & Forage Disc Mower Decks — Korea & Japan

Multi-disc mower-conditioners used in Korean Gangwon forage production and Japanese Hokkaido dairy farming typically carry 4–6 disc positions across a 1.8–2.5m working width. Each disc position runs an EP-MDH-65 spindle (or equivalent) — the larger bearing span and hex flange are standard on European-heritage mower-conditioner designs that have become the reference platform for Korean and Japanese forage equipment. The high-cycle use of these machines (mowing 3–5 times per season at 8–10 hours per day) means spindle replacement intervals are measured in seasons, not years — making reliable aftermarket supply from Korea Ever-Power directly relevant to operating cost management.

🍎 Orchard & Vineyard Compact Disc Mowers — Korea & Japan

Compact disc mowers used in Korean apple, pear, and citrus orchards and Japanese vineyard alleys typically carry 2–3 disc positions across a 1.0–1.5m working width. The EP-MDH-40's square flange and smaller footprint suit the compact deck plate designs used in these machines — where overall deck profile width is constrained by tree row spacing and the mower must fit between root-zone protection boards. In Japan's Yamanashi grape growing district, where inter-row spacing is as tight as 1.2m, the compact EP-MDH-40 spindle profile is a dimensional requirement, not just a preference.

🚧 Roadside & Municipal Disc Mower Maintenance — Korea

Korean municipal road maintenance departments and highway management contractors operating multi-disc mowers on roadside verges encounter high spindle wear rates due to the stone, debris, and rough terrain typical of verge mowing. The EP-MDH series — specifically the EP-MDH-65 for heavy-duty roadside machines — is a common workshop replacement item in Korean agricultural machinery repair shops that service municipal equipment contracts. The 3–5 day delivery time from Korea Ever-Power is particularly valued in this context, as a mower deck with a failed spindle is completely inoperative and delays road maintenance schedules.

🏭 OEM Disc Mower Manufacturing — Korea & Southeast Asia

Korean agricultural machinery manufacturers in Gyeongnam and Gyeongbuk industrial zones building mowers for domestic sale and export to Southeast Asia specify the EP-MDH series as their standard spindle hub. The dimensional compatibility with European mower deck design standards — the same bolt patterns and hub OD values used on Krone, Claas, and New Holland disc mowers — allows Korean OEM manufacturers to build machines that are parts-compatible with the European equipment already operating in their target export markets. Korea Ever-Power supplies OEM customers with volume pricing, dimensional certification, and dedicated production slots for the EP-MDH series.

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Spindle Maintenance & Replacement — Recognising When to Act

Unlike PTO gearboxes that fail suddenly, mower deck spindles typically degrade progressively. Recognising the early warning signs and acting before catastrophic failure prevents secondary damage to the blade carrier, deck plate, and adjacent spindles:

⚠️ Excessive Vibration at Disc Speed

A new or acceptable vibration level that increases over the season indicates developing bearing play. Check by grasping the disc (with machine stopped and fully isolated) and rocking laterally — more than 1–2mm of shaft movement at the blade carrier indicates bearing play requiring immediate spindle replacement.

⚠️ Oil Leakage from Lower Shaft Exit

Oil visible on the outside of the spindle housing below the deck plate indicates lower seal failure. Continued operation with a weeping seal allows grass fibres to enter the bearing via the compromised seal, accelerating abrasive wear on the lower bearing race. Replace the seal — or the entire spindle if the seal failure has been present for more than a few hours of operation.

⚠️ Rumbling or Grinding Noise at Low Speed

Engage the PTO at low throttle and listen for a rough, cyclic sound from a specific disc position — this is the bearing noise characteristic of race damage or contamination. It often disappears at full speed as the damaged area is rotating too fast to produce the audible frequency — this masking effect causes many operators to underestimate the severity.

📋 Routine Inspection Interval

Check spindle shaft play and grease nipple condition at every 50 hours of mowing operation. Grease the spindle at each 50-hour check using NLGI No.2 lithium complex grease — the grease nipple location varies by model. At the start of each season, remove blade carriers and inspect the lower shaft for fretting wear marks at the carrier key slot and locking ring groove.

Why Disc Mower Manufacturers & Workshops Choose Korea Ever-Power

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Precision bearing seat machining — mower spindle production line

Producing a disc mower spindle to the tolerances that determine blade height consistency and bearing life requires precision machining capability that goes beyond standard agricultural gearbox production. Korea Ever-Power Agricultural Machinery Co., Ltd.'s CNC turning and grinding equipment handles the spindle shaft roundness, flange face flatness, and bearing seat tolerances of the EP-MDH series on the same production floor as the larger HC series bevel gearboxes — using the same quality management workflow and the same 100%-inspection final test procedure.

For Korean and Japanese agricultural machinery workshops, the 3–5 day delivery time from Korea Ever-Power's regional stock positions means a a spindle failure does not become a multi-week machine downtime event. Single-unit orders are accepted with no minimum quantity, making the EP-MDH series accessible to small repair workshops and individual farm operators as well as OEM production customers. Full export documentation is prepared for every shipment for smooth customs clearance across the Asia-Pacific region.

✔ Precision CNC spindle shaft and flange machining

✔ Shaft runout verified ≤0.05mm TIR before dispatch

✔ Grass-resistant lower seal design for field conditions

✔ No minimum order — single-unit repair orders accepted

✔ 3–5 day dispatch to Korea and Japan from stock

✔ OEM: dimensional certification, volume pricing available

Complete Your Disc Mower Drive System

The EP-MDH spindle is one component in the complete disc mower drive chain. Korea Ever-Power supplies compatible components for the other stages:

⚙️ Primary Input Gearboxes

The EP-LF205 (30HP, dual ratio) and EP-LF211 (20HP, 1:2.83) are the standard input gearboxes for mower decks using the EP-MDH spindle series. Browse the full lawn mower gearbox range for all compatible primary drive units.

🔩 PTO Drive Shafts

Connecting the tractor to the primary input gearbox — PTO drive shafts in standard disc mower lengths with safety guards and wide-angle joints for the hitch lift travel common in multi-disc mower operation.

→ cvjointdriveshaft.com

🌾 Full Special Application Range

Browse the complete special application gearbox range for other disc mower and specialised implement drive requirements — including round baler drives, angle drives, and vertical-shaft configurations.

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What Customers Say About the EP-MDH Series

Choi Yeong-jun Agricultural Machinery Workshop · Chuncheon, Gangwon Province, South Korea · 2024

I repair mowers for about 40 forage producers in the Chuncheon area. The EP-MDH-65 has become my go-to replacement spindle for the 1.8–2.5m disc mowers these operations run. Before I found Korea Ever-Power, I was waiting 3–4 weeks for OEM spindle parts from a European supplier — which meant the mower sat idle during critical cutting windows. Korea Ever-Power delivers the EP-MDH-65 in 4–5 days. Fit has been correct on every order — the hex flange bolt pattern and hub OD match the machines I'm working on. The shaft runout on the units I've checked is within 0.04mm, which is acceptable for the disc weights my customers are running.

Suzuki Taro Disc Mower OEM Manufacturer · Saitama Prefecture, Japan · 2024

We build compact disc-type mowers for the Japanese domestic market — 1.2m and 1.5m working width models for orchard and small-farm use. We switched to the EP-MDH-40 as our standard spindle unit 16 months ago. The square flange bolt pattern and hub OD match our deck design exactly. Production quality has been consistent across 12 monthly orders — no dimensional variation that would require rework on our assembly line. The Korea Ever-Power team provided a dimensional drawing on request for our engineering records. OEM lead time has been 5–6 days consistently.

Kim Tae-hoon Municipal Equipment Maintenance · Suncheon, South Jeolla, South Korea · 2024

We maintain 8 disc mowers for the city of Suncheon's roadside mowing programme. The machines take hard abuse on the verge work — stone strikes, rough surfaces, and heavy grass in the rainy season. We now keep two EP-MDH-65 units in stock at all times as field spares. A spindle failure during the mowing season previously put a machine out of service for 2–3 weeks. With Korea Ever-Power supply at 4 days, we can swap the spindle in the workshop and have the machine back on the road the same week. The lower seal on the units we've had in service for 400+ hours is still holding — better than the OEM units they replaced.

Pham Duc Anh Agricultural Machinery Dealer · Hanoi, Vietnam · early 2025

I import mower spare parts for Vietnamese customers who operate European-brand mowers. The EP-MDH-65 fits the spindle positions on the 1.8m Krone and Claas disc mowers my customers use — verified by measuring the existing bolt pattern against the Korea Ever-Power dimensional drawing. I ordered 6 units for a first shipment and all fitted correctly. Delivery to Hanoi was 6 days. For Vietnamese customers who previously had to wait months for OEM parts, this is a significant improvement. Price is approximately 45% below OEM list. I plan to make EP-MDH series a standard stock item in my inventory.

Frequently Asked Questions — EP-MDH Mower Spindle Series

How do I know whether my mower deck needs the EP-MDH-40 or EP-MDH-65?

Measure the existing spindle on your deck: (1) count the flange bolt holes — 4 bolts in a square pattern indicates MDH-40; 6 bolts in a hex pattern indicates MDH-65; (2) measure the hub outer diameter where the flange meets the deck plate — approximately 101mm indicates MDH-40, approximately 99mm (Φ99) at the hub OD for MDH-65; (3) measure the flange outer diameter — approximately 128mm square for MDH-40, approximately 250mm round for MDH-65. Alternatively, send us the existing spindle model number or photographs of the flange and we will confirm the correct replacement before you order.

Can the EP-MDH-40 spindle be used to upgrade a mower deck that currently uses a smaller spindle?

Not as a direct swap — the bolt pattern and hub OD must match the existing deck plate holes. Using a different spindle size requires re-drilling or replacing the deck plate at the affected disc position, which is a structural modification that changes the deck's load capacity and is not recommended without engineering assessment of the specific deck design. Korea Ever-Power provides spindle dimensional drawings for engineering review if a deck modification is being considered.

What lubricant does the EP-MDH spindle use, and how often should it be greased?

NLGI No.2 lithium complex grease — suitable for the high-speed, moderate-temperature conditions of disc mower spindle bearings. Grease every 50 operating hours via the Zerk fitting on the spindle housing. Avoid over-greasing — excessive grease in the bearing cavity can cause the bearing to run hot and overheat the grease, producing a brown discolouration in the oil seal area that is sometimes mistaken for oil seal failure. Two to three pump strokes per 50-hour interval is the correct quantity for most spindle sizes.

The EP-MDH spindle I received has some shaft runout — is this within specification?

Every EP-MDH unit is tested before dispatch with a maximum allowable runout of 0.05mm TIR at the lower blade-carrier shaft. If you measure runout using a dial indicator and find it within this limit, the unit is within specification — some buyers unfamiliar with disc mower tolerances compare to lathe-turned shaft standards which are significantly tighter than necessary for this application. If you measure runout above 0.05mm TIR, contact Korea Ever-Power immediately with the measurement method and reading — units outside this limit are returned and replaced at no cost.

My disc mower has 5 disc positions — how many EP-MDH units do I need to order?

One EP-MDH unit per disc position. A 5-position mower needs 5 spindle units. If you are replacing all spindles on a worn mower deck at end of season, order the complete set — mixed-age spindles on the same deck produce different blade height and vibration characteristics that are difficult to diagnose and correct without standardising all positions simultaneously. Korea Ever-Power can supply multi-unit orders with consistent batch quality, typically from the same production run, at volume pricing for 3 or more units.

Are the EP-MDH spindles compatible with Krone, Claas, or New Holland disc mower decks?

Many European disc mower brands use the same bolt pattern and hub OD standards for their spindle positions — the EP-MDH-65 (hex flange, Φ250mm OD, Φ139.7mm PCD) corresponds to a widely used European spindle standard. Compatibility with specific Krone, Claas, or New Holland models should be confirmed against your machine's specific spindle dimensions before ordering — the bolt pattern, hub OD, and deck-plate cutout diameter all need to match. Send us your machine make, model, and year and we will confirm compatibility. Korea Ever-Power is not affiliated with or an authorised parts supplier for these OEM brands.

What warranty and shipping options apply to the EP-MDH series?

12-month warranty from dispatch against manufacturing defects — covering housing integrity, bearing failure not caused by grease neglect or contamination, shaft runout above the specified limit, and seal defects present at delivery. Not covered: bearing failure from insufficient greasing, impact damage from stone strikes, or shaft damage from blade carrier over-torque. Shipping: DHL or FedEx for 1–10 units (3–5 days to Korea and Japan; 5–7 days to SEA). Sea freight for larger quantities (10–18 days). Full export documentation prepared for every shipment including Certificate of Origin for RCEP preferential tariff applications.