WoodMaxx FM-78 vs FM-78H hammers: fixed offset or hydraulic adjustment?
The fixed FM-78 already provides the 70-inch cut and 30–65 PTO hp range of the FM-78H. Paying for the H changes lateral control: it can shift through the tractor’s rear remotes, while the fixed mower stays in its documented offset position. The dated H price was $720 higher, and its manual product weight was 88 lb higher. Choose the adjustment for a specific access need, then verify the hydraulic circuit and complete operating load.
By Acreage Equipment · Reviewed November 7, 2026 · Specification research, not a field test
WoodMaxx FM-78 · Hammer blades: when to shortlist itConsider FM-78 when its fixed placement covers the intended work, the tractor falls within 30–65 PTO hp, and complete-load and driveline checks pass.
WoodMaxx FM-78H · Hammer blades: when to shortlist itConsider FM-78H when powered lateral movement is worth the added purchase cost and its required rear-remote circuit is available and verified; confirm the complete operating load.
New fixed-model direct HTML observation and retained phase-5 H-model observation are both dated November 7, 2026. H pricing was not newly refreshed in this batch; confirm current configured and delivered quotes. Open your saved comparison →
The differences that matter.
01
Offset control and tractor connection
FM-78: fixed offset; no remote circuit needed for offset adjustment. FM-78H: hydraulic side shift; tractor rear remotes required.
Fixed placement avoids the remote connection requirement. The H is useful when lateral adjustment solves a real access task, after confirming circuit, couplers, flow and pressure.
Both retain the larger PTO band and Cat 2 mounting option
Both hammer models use a 30–65 PTO-hp range. Their current manual documents Category 1 or Category 2 mounting with the required Cat 2 bushings, while lower product-page copy says Cat 1 only.
A tractor above 50 PTO hp raises a different shortlist question than it does with the TMG mower’s 50 PTO-hp ceiling. The fixed and H WoodMaxx versions share the higher published band; neither resolves the mounting-text conflict or confirms a named quick hitch.
Check where the 70-inch swath sits before paying for movement
The fixed FM-78 table lists lateral extents of 33 inches left and 46 right from the PTO center. These figures have not been verified as cutting-edge locations. The FM-78H’s separately advertised 18-inch offset also does not establish cylinder travel.
Ask for a dimensioned working envelope showing cutting edges, approved travel and shaft/hose clearance. If the fixed placement covers the job, the H adds movement rather than additional cutting width.
The current-manual product figures differ by 88 lb. Both conflict with page figures and leave shaft/oil inclusion unresolved; do not treat the difference as verified installed load.
WoodMaxx FM-78H · Hammer blades: when to shortlist it
Consider FM-78H when powered lateral movement is worth the added purchase cost and its required rear-remote circuit is available and verified; confirm the complete operating load.
Page/manual weight bases and figures differ for both models.
Manual/hero Cat 1/2 support conflicts with lower Cat 1-only page text.
The H’s 18-inch offset statement is not verified cylinder travel.
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.
