THE TRADEOFFS, EXPLAINED

WoodMaxx MX-9900 vs WM-8H: 9-inch hydrostatic or 8-inch hydraulic feed

On a Category 2-only tractor such as the LS MT463 (54.1 PTO hp), WoodMaxx’s chippers are among the few that list the hitch. MX-9900 and WM-8H both reach full capacity at 50+ hp and have no published ceiling. The choice is a 9-inch hydrostatic feed against an 8-inch hydraulic feed, at different prices.

By Acreage Equipment · Reviewed November 9, 2026 · Specification research, not a field test

Compare these two with my tractor Compare the complete purchase cost →

WoodMaxx

MX-9900

25 PTO hp minimum; maximum not stated · 9″ Maximum chip diameter, inches

$6,990 checked November 7, 2026

Check current price at WoodMaxx

Specs & tractor check →

WoodMaxx

WM-8H

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

$4,095 checked November 7, 2026

Check current price at WoodMaxx

Specs & tractor check →

START WITH THE DECISION

Consider MX-9900 for 9-inch woodShortlist MX-9900 when the tractor has 25 PTO hp or more and large logs are regular work.

Consider WM-8H for the lower priceShortlist WM-8H when 8 inches is enough, or the tractor is between 19 and 25 PTO hp.

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. Open your saved comparison →

The differences that matter.

25 against 19 PTO hp minimum

WoodMaxx lists MX-9900 from 25 PTO hp and WM-8H from 19. Both tie full capacity to 50+ hp and publish no maximum.

Over 50 PTO hp, both are at full rating; between 19 and 25, only WM-8H runs.

9 inches against 8

MX-9900 is listed at 9 inches (5-inch hardwood or 7-inch softwood at 25 PTO hp). WM-8H is listed at 8 inches (4-inch hardwood or 6-inch softwood at 19).

MX-9900 takes the largest wood of any chipper on this site.

Hydrostatic feed against hydraulic feed

MX-9900 uses a self-contained hydrostatic feed filled with about two quarts of 10W-40 motor oil. WM-8H uses a self-contained pump and dual feed motors with a 6.5- or 7-gallon hydraulic fill.

The service fluids and quantities differ.

About 816 lb dry against 990 lb shipping

MX-9900’s manual gives about 816 lb dry; its page 1,048 lb shipping. WoodMaxx publishes only a 990-lb shipping weight for WM-8H.

Ask for operating weights; both are well under a compact-utility lift.

$6,990 against $4,095

Observed November 7, 2026.

MX-9900 costs about 1.7 times as much.

A CONDITIONAL SHORTLIST

Which direction makes sense?

Consider MX-9900 for 9-inch wood

Shortlist MX-9900 when the tractor has 25 PTO hp or more and large logs are regular work.

Check current price at WoodMaxx Prepare questions for the seller

Consider WM-8H for the lower price

Shortlist WM-8H when 8 inches is enough, or the tractor is between 19 and 25 PTO hp.

Check current price at WoodMaxx Prepare questions for the seller

Keep these source limits with the decision.

MX-9900’s manual gives about 816 lb dry; its page gives 1,048 lb shipping.

WM-8H’s page gives 19 PTO hp in its description and 15 hp in a lower spec bullet.

This comparison reuses the manufacturer evidence retained in the product records reviewed November 7, 2026; product pages were not re-fetched on November 9. MX-9900 uses the current page and Rev C manual; WM-8H uses the current page and linked manual.

FOLLOW THE NUMBERS

Sources & documentation

Research record reviewed November 9, 2026. Confirm the current manual and the exact revision supplied with your machine.

WoodMaxx MX-9900 official product pageHorsepower and full-capacity statements
MX-9900 manual Rev C, September 18, 2026: specifications and setupRev C printed p42: approximately 816 lb dry weight; self-contained hydrostatic feed; 10W-40 motor oil, about two quarts
WoodMaxx current manufacturer manual index
Official WM-8H product page: power, feed, hitch and price19 PTO hp minimum; 4-in. hardwood / 6-in. softwood at 19 PTO hp; full 8-inch at 50 PTO hp; self-contained hydraulic feed; Category 1/2; 990 lb shipping; price
WM-8H linked manual — assembly p20 and maintenance p29 give different fill quantitiesAssembly p20 6.5 gal and maintenance p29 7 gal hydraulic fill