THE TRADEOFFS, EXPLAINED

Wallenstein BX72S vs WoodMaxx WM-8M: Category 2 chippers for a 50-hp tractor

BX72S and WM-8M are two of the few chippers here that list Category 2 mounting. Wallenstein rates BX72S at 50–85 engine hp, so a 52-hp tractor such as the LS MT352 clears it by 2.0. WoodMaxx rates WM-8M from 19 PTO hp. BX72S is a 7-inch gravity-feed machine sold through dealers; WM-8M is an 8-inch fixed-speed roller-feed machine with a listed price.

By Acreage Equipment · Reviewed November 8, 2026 · Specification research, not a field test

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Wallenstein

BX72S

50–85 engine hp · official U.S. page · 7″ max. chip diameter

Check seller price Request a current quote

Explore buying options at Wallenstein

Specs & tractor check →

WoodMaxx

WM-8M

19 PTO hp minimum; maximum not stated · 8″ max. chip diameter

$3,690 checked November 7, 2026

Check current price at WoodMaxx

Specs & tractor check →

START WITH THE DECISION

Consider BX72S for dealer support above 50 engine hpShortlist BX72S when the tractor’s confirmed engine rating is at least 50 hp under Wallenstein’s standard, the dealer confirms Category 2 mounting parts, and material is mostly under 7 inches.

Consider WM-8M for consistent Category 1 or 2 mounting and a listed priceShortlist WM-8M when a powered fixed-speed feed suits the material, the tractor is at least 19 PTO hp, and a listed price and documented Category 2 mounting matter.

Read the evidence behind the choice ↓

Observed U.S. seller prices, checked November 7, 2026, from the retained product records. Prices were not refreshed for this comparison. Tax, shipping, options and the final seller quote may change the delivered total; these are dated observations, not a live price or stock feed. Wallenstein does not publish a price; request a dealer quote. Open your saved comparison →

The differences that matter.

50 engine hp against 19 PTO hp

Wallenstein’s page labels BX72S’s 50–85 band Engine HP Range. WoodMaxx lists WM-8M from 19 PTO hp with no maximum and ties its 8-inch statement to softwood at 50+ PTO hp.

A tractor below 50 engine hp, such as a 42-hp LS MT342, is outside BX72S’s range but inside WM-8M’s. At 52 engine hp both are inside; ask Wallenstein whether a gross figure with no named standard satisfies its 50.

Category 2 evidence on each

BX72S’s current page lists Cat I and II mounting; Wallenstein’s Jan-2025 BX-S manual lists Cat I only. WM-8M’s page and manual list Category 1 or 2 direct mounting, with quick-hitch use limited to Category 1.

WM-8M’s Category 2 support is consistent across its documents; BX72S’s is on the page only. Ask the Wallenstein dealer which mounting parts ship for a Category 2 tractor.

7-inch gravity feed versus 8-inch roller feed

BX72S is a gravity-feed, direct-drive chipper with a 7-inch diameter rating, 7 × 12-inch opening and 82-inch discharge height. WM-8M has an 8 × 8-inch opening and a mechanically driven roller at a fixed 58 ft/min with stop.

WM-8M pulls material in at a set speed; BX72S relies on the rotor and gravity. Neither offers variable feed. Choose by typical branch size and how the material handles.

728 lb against 775 lb

Wallenstein lists BX72S at 728 lb on its page and in the manual without defining shaft inclusion. WM-8M’s page lists 775 lb on the three-point hitch, also without stated inclusions.

The reference weights are close. Neither is a complete operating weight; ask both sellers, and ask for the tractor’s 24-inch rating if only a link-end figure is published.

PTO speed options

Wallenstein supports 540 or 1,000 rpm with the correct driveline and lists a separate 1,000-rpm shaft. WM-8M is 540-rpm.

On a 540-rpm tractor, confirm BX72S ships with the 540 configuration and shaft.

A CONDITIONAL SHORTLIST

Which direction makes sense?

Consider BX72S for dealer support above 50 engine hp

Shortlist BX72S when the tractor’s confirmed engine rating is at least 50 hp under Wallenstein’s standard, the dealer confirms Category 2 mounting parts, and material is mostly under 7 inches.

Explore buying options at Wallenstein Prepare questions for the seller

Consider WM-8M for consistent Category 1 or 2 mounting and a listed price

Shortlist WM-8M when a powered fixed-speed feed suits the material, the tractor is at least 19 PTO hp, and a listed price and documented Category 2 mounting matter. Confirm the shaft and hitch parts in the quote.

Check current price at WoodMaxx Prepare questions for the seller

Keep these source limits with the decision.

BX72S’s page lists Cat I and II mounting while the shared BX-S manual lists Cat I only; its folded width is given as 42 inches and 132 cm.

WM-8M’s page and manual contain copied WM-8H hydraulic-feed language; shipping weight appears as 950 and 990 lb.

This comparison reuses the manufacturer evidence retained in the product records reviewed November 7, 2026; product pages were not re-fetched on November 8. BX72S uses the current U.S. page and the Jan-2025 BX-S manual; WM-8M uses the current page, WoodMaxx’s FAQ and the manual marked 3/20.

FOLLOW THE NUMBERS

Sources & documentation

Research record reviewed November 8, 2026. Confirm the current manual and the exact revision supplied with your machine.

Wallenstein BX72S official U.S. pageEngine HP Range; Mounting System (Cat I and II); Total Weight; Discharge Chute Height; Accessories
BX72S official support page — current operator/setup documents
Wallenstein BX-S operator manual Z97085_En, Rev Jan-2025Printed/PDF pp18 and 40: mounting (Cat I), capacity and opening, rated PTO speeds, weight
PTO shaft instructions Z97844_En, Rev Aug-2024 — tractor/quick-hitch sizing
WoodMaxx WM-8M official product pageIntroduction (19 PTO hp minimum, 50+ PTO hp full capacity); Infeed Opening; Total weight on 3 point hitch; Quick Hitch Compatible; price
WoodMaxx WM-8M assembly and operator manual, marked 3/20Printed pp18,20–23 / PDF pp19,21–24: hitch and shaft sizing; printed p53 mechanical drive parts
WoodMaxx manufacturer FAQQuestion 1: WM-8M mechanical drive, 58 ft/min feed and stop, 8-inch softwood at 50+ PTO hp