Blue Diamond Heavy Duty 403740 flail mower

Manufacturer series photograph from the Blue Diamond flail mower page; the file is labeled for the standard-duty line. Confirm the heavy-duty 403740 configuration with the dealer.

Blue Diamond · flail mower

Heavy Duty 403740

An 87-inch heavy-duty flail mower for Category I or II tractors in a 75–100 hp range, with 18 inches of hydraulic side shift as standard.

87"cutting width75–100HP · verify basis

75–100 HP recommended (basis not stated) · spec sheet and manual

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THE SHORT ANSWER

Is Heavy Duty 403740 worth a closer look?

The 403740 is the only flail here rated past 85 hp, so it is the one to look at for tractors over Land Pride’s 80. It weighs 1,763 lb without the shaft and needs a rear remote for its side shift; check lift, ballast and hydraulics before ordering.

The seller confirms the exact setup, current price and delivery. No field test or manufacturer-confirmed pairing is claimed.

THE BUYING PERSPECTIVE

Know before you order.

  • The spec sheet and manual give a 75–100 HP recommended range without identifying PTO versus engine horsepower.
  • The spec sheet lists 18 hammers and the manual 20 for the 403740; the manual prints the working width as “871 in. (2230 mm)”, a misprint of 87.8 in.
  • Blue Diamond sells through dealers and publishes no list price.
  • Check three-point geometry, actual lift capacity at the implement load center, front ballast and axle limits.
  • Check PTO shaft length, overlap, shielding and clearance across permitted hitch travel; quick hitches change geometry.

Published specifications

Power requirement
75–100 HP recommended (basis not stated) · spec sheet and manual
Rear PTO
540 rpm
Three-point hitch
Category 1 / 2
cutting width
87 inches
Unit weight
1763 lb — 1,763 lb (800 kg) in the Aug-2025 spec sheet (without PTO) and the Feb-2026 manual p49. Add the PTO shaft for the operating load.
Hydraulics
Hydraulic side shift up to 18 inches is standard and needs a tractor rear remote (double-acting); confirm hose ends and flow with the dealer.
Accessories & setup
Slip-clutch PTO driveline, adjustable rear roller and rakes, forged hammer blades and hydraulic side shift are listed as standard; confirm the shaft and hoses that ship with the order.

Specifications are manufacturer-published, not measured by Acreage Equipment. A shipping weight is not treated as operating weight.

FOLLOW THE NUMBERS

Sources & documentation

Research record reviewed November 14, 2026. Confirm the current manual and the exact revision supplied with your machine.

  1. Blue Diamond flail mower page — 35–100 HP line, Category 1 & 2, hydraulic side shift and downloads
  2. Blue Diamond flail mower spec sheet, revised 08.21.25 — heavy-duty 403740 row
  3. Blue Diamond Heavy Duty Flail Mower manual (Feb 2026) — p4 model table, p49 specifications

TRACTORS WE HAVE CHECKED

Which tractors can run the Heavy Duty 403740?

10 of 216 researched tractor families pass the published screen on at least one configuration. Open your tractor for the exact result and the details to confirm.

All tractor guides

UNDERSTAND THE SETUP

Make the next check easier.

KEEP EXPLORING

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