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THE ACREAGE EQUIPMENT FIELD GUIDE

Chipper replacement knife sets: count, contents and compatibility

A replacement knife set can mean moving knives only, moving knives plus a stationary cutting part, or several replacement sets packaged together. Before comparing quotes, identify the machine’s cutting parts, count the physical pieces and check the exact part number against its serial number. Reversible edges are another count; they are not extra spare knives.

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

PTO wood chippers at work
In this guide

THE DECISION IN NUMBERS

Worked spare-package comparison: translate pieces into contents

Counts and restrictions come from the named official listings. The Farmry two-group calculation compares its 8+2 package with the machine’s 4+1 count; it does not approve another model. No price, stock, service-life or installation claim is made.

Scroll the table sideways on smaller screens.

Exact listed packageDocumented contentsWorked interpretationQuestion before ordering
MX-9900, 70000204 flywheel knives; S/N 10390 and upOne four-knife flywheel setAre required fasteners supplied?
MX-9900, 70000215-piece flywheel and bed knife set; same serial restriction4 flywheel knives plus 1 bed knifeWhich hardware is included?
MX-9900, 7000022Complete replacement kit; same serial restrictionContents not itemized in retrieved descriptionProvide every part number and quantity
WC68, 00025604 blades, 16 bolts, 6 nuts listedNut count differs from 16 manual bolt/nut pairsConfirm the actual complete hardware package
WCAP5, 201803A8 moving + 2 fixed blades8÷4 = 2 moving sets; 2÷1 = 2 stationary partsConfirm exact WCAP5 compatibility and extra-spare quantity
Sources for this decision table (7)

Count physical knives and usable edges separately

WoodMaxx describes four installed, dual-edge flywheel knives on the MX-9900. Four knives with two edges each gives eight described cutting edges across the set, not eight physical knives or eight full replacement sets. That arithmetic does not predict service hours. Woodland’s WC68 manual separately identifies flywheel blades and a bed plate; WoodMaxx calls its stationary cutting part a bed knife. Preserve each maker’s part name when requesting a quote.

Match the package to the parts you intend to keep on hand

WoodMaxx product 7000020 is a four-piece MX-9900 flywheel-knife set. Product 7000021 is a five-piece set covering flywheel and bed knife. They therefore answer different spare-parts requests. Its product 7000022 is titled a complete replacement kit, but the retrieved description does not itemize the additional contents. Request a written parts list before assuming that complete includes every fastener, wear part or tool you need.

The serial cutoff can matter more than the model name

All three retrieved MX-9900 kit listings specify serial number 10390 and above. An order identified only as MX-9900 leaves that restriction unchecked. Send the machine’s serial number and the applicable manual revision with the parts inquiry, especially for a used machine or one with a replaced cutting assembly. The catalog restriction is a compatibility condition, not evidence that all earlier machines use the same alternative kit.

Read hardware quantities instead of relying on kit wording

The WC46 kit, SKU 0002556, lists four blades, sixteen bolts and sixteen locking nuts. The separate WC68 set, SKU 0002560, lists four blades and sixteen bolts but only six locking nuts. WC68’s Rev C manual describes four bolt-and-nut pairs per blade across four blades. This discrepancy needs a seller itemization; it is not a reason to assume the WC46 kit fits the WC68 or to silently change the WC68 listing.

Separate installed equipment, optional spares and multiple sets

Farmry lists four moving blades and one stationary blade on the WCAP5. Its replacement package, SKU 201803A, contains eight moving and two fixed blades: two matching count groups, subject to exact compatibility. The main machine page presents that package as a separately selectable accessory. Ask the quote to identify installed parts and additional boxed spares separately. Request availability and the delivered spare-parts total for the chosen package; piece counts alone do not establish future replacement frequency.

Take these questions with you.

  1. Which exact spare-part SKU is approved for my model, serial number and delivered cutting assembly?
  2. Does this quote include flywheel knives, the stationary bed knife or bed plate, and an itemized quantity of required hardware?
  3. How many parts are installed and how many additional full sets are boxed as spares, and what is the current delivered quote for those spares?

Keep these questions with your exact tractor and attachment details.

Use these questions in my seller brief

FOLLOW THE NUMBERS

Sources & documentation

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

  1. WoodMaxx MX-9900 page — fold-up bin, service hinge, installed knives and shipping dimensions
  2. WoodMaxx MX-9900 four-piece flywheel knife set — product code 7000020
  3. WoodMaxx MX-9900 five-piece flywheel and bed knife set — product code 7000021
  4. WoodMaxx MX-9900 complete replacement kit — product code 7000022
  5. Woodland Mills WC46 blade kit — SKU 0002556 and itemized hardware
  6. Woodland Mills WC68 blade set — SKU 0002560 and unresolved nut count
  7. Woodland Mills WC68 manual Rev C, May 28, 2024 — stored and operating drawings; blade parts
  8. Farmry WCAP5 page — installed cutting-part counts and optional accessory selector
  9. Farmry WCAP5 replacement blades — SKU 201803A, eight moving and two fixed
  10. Farmry WCAP5 operator manual, Rev 1.5 — Printed pp19–20 specifications; pp30–34 driveline checks
  11. Woodland Mills official U.S. product page — Capacity and hydraulic infeed sections; current price
  12. Woodland Mills WC46 operator manual, Rev C, 28-May-2024 — Printed p9 product/shipping weights; p12 Cat 1 and PTO range; operation/setup sections
  13. Woodland Mills official U.S. product page — Capacity and hydraulic infeed sections; current price
  14. MX-9900 manual Rev C, September 18, 2026: specifications and setup
  15. WoodMaxx current manufacturer manual index

EQUIPMENT IN THIS GUIDE

Check prices and fit for the attachments discussed.

MAKE THE NEXT CHECK

Continue with the related decision.

FIELD GUIDE

Compare the complete cost of a tractor attachment

The advertised attachment price is one line of the purchase. A useful quote also identifies the exact revision, included driveline and accessories, freight and unloading, tax, and any required setup. Start with a suitable candidate, then ask each seller to price the same complete package. A low total cannot resolve a known tractor mismatch.

Read the guide →FIELD GUIDE

Chipper hopper size, throat size and branch diameter

A large hopper opening is not a promise to chip a log of that width. The outer mouth guides material toward a smaller cutting throat; the maker’s maximum branch diameter is a separate limit with its own power conditions. Compare all three measurements before paying for a larger chipper, especially if your brush is forked or your tractor is near the minimum PTO rating.

Read the guide →FIELD GUIDE

Dry vs. fresh wood: which chipper capacity applies?

A chipper’s largest advertised diameter may apply only to a particular material and power condition. Before comparing machines, record whether your wood is fresh or dry, its species if known, and the diameter you handle most often. A condition-matched capacity statement is more useful than a large number detached from its qualifications.

Read the guide →

MAKE THE TRADEOFFS CLEAR

Read a focused comparison.

SIDE BY SIDE

Wallenstein BX52S vs WoodMaxx MX-9900: engine-rated 5-inch or PTO-rated 9-inch

BX52S or MX-9900?

Read the guide →SIDE BY SIDE

Farmry WCAP5 PRO vs WoodMaxx MX-9900: 5-inch gravity or 9-inch hydrostatic feed

WCAP5 PRO or MX-9900?

Read the guide →SIDE BY SIDE

Farmer-Helper FH-BX42 vs Woodland Mills WC68: $1,683 gravity or $3,450 hydraulic feed

Compact tractor: FH-BX42 or WC68?

Read the guide →
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