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

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

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.

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.

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.

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.

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.

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.

⚠️ 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.

Precision bearing seat machining — mower spindle production line

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.

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.