FM-78 · Hammer blades

THE BUYING PERSPECTIVE

Know before you order.

• Hammer configuration only: current manual specifies 30–65 PTO hp for both blade options, but this record represents the hammer option.
• The model name is not cutting width: 70 inches is the actual published cut. The page lists 80 inches overall width; manual product-dimension labels differ.
• Fixed offset: current manual and page list 33 inches left and 46 inches right from the PTO/center reference. These extents are not verified cutting-edge reach or an adjustable travel range.
• The current manual says no hydraulic side shift for this fixed model. Do not copy rear-remote requirements or offset-travel claims from the H model.
• Manual product weight is 880 lb with inclusions unstated. Page mower-only weight is 710 lb plus a separately stated 39 lb shaft. Confirm the complete hammer assembly before lift or ballast assessment.
• The page says Y-blade and hammer-equipped mowers are not interchangeable. Choose the blade configuration when ordering.
• Use 540 rpm at the tractor PTO; 2,160 rpm is rotor speed.
• Current manual and page hero support Cat 1 or Cat 2 with bushings; lower page text says Cat 1 only. Confirm the delivered hitch revision and required Cat 2 bushing set.
• Page Cat 1 quick-hitch text excludes John Deere iMatch. Standard hitch category alone does not establish quick-hitch fit or driveline clearance.
• No physical performance test or tractor fit approval is claimed.

Published specifications

Power requirement

30–65 PTO hp · Hammer blades only

Rear PTO

540 rpm

Three-point hitch

Category 1 / 2

Cutting width, inches

70 inches

Unit weight

880 lb — Current 2025-and-newer manual printed p40 / PDF p41 lists 880 lb product weight without shaft/oil/packaging inclusion. Page lists 710 lb mower-only plus a 39 lb shaft; shipping is separately labeled 900 lb. Retain these distinct bases and confirm complete operating weight for the delivered hammer assembly.

Hydraulics

Fixed offset; current manual explicitly lists no hydraulic side shift. No tractor remote circuit is required for offset adjustment. The tractor three-point lift remains necessary.

Accessories & setup

Page lists an included 1-3/8-inch, six-spline PTO shaft with slip clutch and includes gearbox oil. Cat 1 quick-hitch and quick-hitch bushings are separate add-ons; exact geometry and shaft sizing still need checking. Current manual requires Cat 2 bushings for Cat 2 mounting; inclusion is not confirmed.

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