WoodMaxx WM-8M vs MX-9900: fixed mechanical feed or a 9-inch hydrostatic-feed chipper
WM-8M and MX-9900 are two of the few chippers on this site that list Category 2 mounting, which matters on a tractor such as the KIOTI NS6010 (Category II in KIOTI’s current documents). Both start well below its 48 PTO hp and both tie full capacity to about 50 hp. MX-9900 adds an inch of capacity and an operator-controlled hydrostatic feed, at nearly twice the observed price.
By Acreage Equipment · Reviewed November 9, 2026 · Specification research, not a field test
Consider WM-8M for a simpler 8-inch chipperShortlist WM-8M when a fixed-rate feed suits the work, material is mostly under 8 inches and cost matters.
Consider MX-9900 for feed control and 9-inch materialShortlist MX-9900 when the operator wants to slow or reverse the feed, material reaches 9 inches and WoodMaxx confirms the basis of its 50+ HP line for your tractor.
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.
01
19 against 25 PTO hp minimum
WoodMaxx lists WM-8M from 19 PTO hp and MX-9900 from 25 PTO hp. Neither states a maximum.
Most compact tractors over 25 PTO hp are inside both.
WM-8M feeds at a fixed 58 ft/min with a stop. MX-9900 has a self-contained hydrostatic feed set by the operator’s control bar, filled with 10W-40 motor oil.
MX-9900 lets the operator slow or reverse the feed; WM-8M has fewer parts and no oil circuit.
Consider MX-9900 for feed control and 9-inch material
Shortlist MX-9900 when the operator wants to slow or reverse the feed, material reaches 9 inches and WoodMaxx confirms the basis of its 50+ HP line for your tractor.
Some WM-8M manual sections use copied WM-8H hydraulic-control wording; WM-8M shipping weights conflict at 950 and 990 lb.
MX-9900’s page and manual say factory oil is included, while a lower page paragraph instructs an initial two-quart fill.
This comparison reuses the manufacturer evidence retained in the product records reviewed November 7, 2026; product pages were not re-fetched on November 9. WM-8M uses the current product page, linked manual and FAQ; MX-9900 uses the current product page and the Rev C manual.
FOLLOW THE NUMBERS
Sources & documentation
Research record reviewed November 9, 2026. Confirm the current manual and the exact revision supplied with your machine.
