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THE TRADEOFFS, EXPLAINED

WoodMaxx FM-62 vs FM-78 hammers: choose a fixed cutting width

Start with the actual cut: FM-62 covers 55 inches and FM-78 covers 70. Both use fixed offset, so neither needs a remote hydraulic circuit for lateral adjustment. The larger model also raises the hammer range from 24–45 to 30–65 PTO hp and documents a Cat 2 mounting route. Confirm the complete rear load and fixed cutting-edge placement before choosing width.

By Acreage Equipment · Reviewed November 7, 2026 · Specification research, not a field test

Compare these two with my tractor Compare the complete purchase cost →
WoodMaxx FM-62 · Hammer blades flail mower

WoodMaxx

FM-62 · Hammer blades

24–45 PTO hp · Hammer blades only · 55″ Cutting width, inches

$3,630 checked November 7, 2026

Check current price at WoodMaxx
Specs & tractor check →
WoodMaxx FM-78 · Hammer blades flail mower

WoodMaxx

FM-78 · Hammer blades

30–65 PTO hp · Hammer blades only · 70″ Cutting width, inches

$3,900 checked November 7, 2026

Check current price at WoodMaxx
Specs & tractor check →

START WITH THE DECISION

WoodMaxx FM-62 · Hammer blades: when to shortlist itConsider the 55-inch fixed mower for narrower access or a tractor within 24–45 PTO hp, if fixed edge placement and complete operating load suit the job.

WoodMaxx FM-78 · Hammer blades: when to shortlist itConsider the 70-inch cut, 30–65 PTO hp band or Cat 2 mounting route when fixed placement works and the larger complete load and clearance are confirmed.

Read the evidence behind the choice ↓

Exact black/hammer variations observed November 7, 2026; no delivered quote. Open your saved comparison →

The differences that matter.

01

Actual cut

FM-62 hammer: 55 inches. FM-78 hammer: 70 inches.

The FM-78 adds 15 inches of published cut. That does not establish an acreage-per-hour gain or centered coverage of a particular tractor.

02

Hammer PTO band

FM-62: 24–45 PTO hp. FM-78: 30–65 PTO hp.

Check both ends using PTO output. A tractor above 45 PTO hp exceeds FM-62’s published band even if a fixed mower is desired.

03

Standard hitch categories

FM-62: Cat 1 only. FM-78: Cat 1 or Cat 2 with Cat 2 bushings.

The larger model has a documented standard Cat 2 route, but the page conflict and actual quick-hitch geometry still require confirmation.

04

Manual product weights

FM-62: 774 lb product weight. FM-78: 880 lb product weight.

These manual figures differ by 106 lb; shaft/oil inclusion is not stated and pages disagree. Obtain complete loads before a lift comparison.

05

Observed hammer price

FM-62: $3,630 USD. FM-78: $3,900 USD.

The wider fixed model was $270 more at the dated observation. Check the full delivered quote and required bushings.

A CONDITIONAL SHORTLIST

Which direction makes sense?

WoodMaxx FM-62 · Hammer blades: when to shortlist it

Consider the 55-inch fixed mower for narrower access or a tractor within 24–45 PTO hp, if fixed edge placement and complete operating load suit the job.

Check current price at WoodMaxxPrepare questions for the seller

WoodMaxx FM-78 · Hammer blades: when to shortlist it

Consider the 70-inch cut, 30–65 PTO hp band or Cat 2 mounting route when fixed placement works and the larger complete load and clearance are confirmed.

Check current price at WoodMaxxPrepare questions for the seller

Keep these source limits with the decision.

FM-62 generic page power minimum is lower than the hammer-specific manual minimum.

Both manual product weights conflict with page mower-only figures.

FM-78 lower page hitch text conflicts with current manual Cat 1/2.

Specifications use the current 2025-and-newer WoodMaxx manual and the identified manufacturer pages. The fixed-model pages were checked November 7, 2026; H-model and TMG observations retain their recorded evidence dates. Selection advice interprets published specifications; it does not report physical testing or a manufacturer-confirmed pairing.

FOLLOW THE NUMBERS

Sources & documentation

Research record reviewed November 7, 2026. Confirm the current manual and the exact revision supplied with your machine.

  1. FM-62 pageWEIGHT
  2. Current manualPrinted p40 / PDF p41, Technical Specifications; named fixed-model column and Hammer row
  3. WoodMaxx manual index: Models 2025 to current
  4. FM-78 pageHero Hitch Type versus lower HITCH TYPE