THE ACREAGE EQUIPMENT FIELD GUIDE

Meeting an attachment’s minimum PTO horsepower exactly: what zero margin means

A tractor whose PTO rating equals or barely exceeds an attachment’s minimum is inside the published range, and nothing more. Several makers attach separate capacity statements well above their minimums. When the margin is zero or one horsepower, also check the source of each number and what the maker expects at that power.

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

In this guide

THE DECISION IN NUMBERS

Worked margins from published figures

Tractor ratings are Mahindra’s published PTO figures; attachment minimums and capacity statements are the retained manufacturer figures. Margin is simple subtraction from documents, not a measured performance reserve.

Scroll the table sideways on smaller screens.

Tractor and attachment	Tractor PTO / minimum	Margin	Separate capacity statement
1626 HST + WoodMaxx WM-8M	19 / 19	0.0 hp	Full 8-inch softwood at 50+ PTO hp
1626 Shuttle + Woodland Mills WC68	21.5 / 20	+1.5 hp	Full 6-inch at full feed needs over 40 PTO hp
1635 HST + WoodMaxx MX-9900	26.0 / 25	+1.0 hp	Separate 50+ HP full-capacity statement
1635 HST + Farmer-Helper FH-BX62S	26.0 / 25	+1.0 hp	45, 50+ or 75 HP in different documents
1626 HST + Woodland Mills WC68	19 / 20	−1.0 hp: below minimum	Not applicable

Sources for this decision table (6)

Mahindra USA 1600 Series brochure, Rev 09022025 ↗PDF p5 Tractor Specifications: engine hp, PTO type, PTO hp by transmission, 3-point lift at 24 in., weight
WoodMaxx WM-8M official product page ↗Configuration, 19 PTO hp minimum, 775-lb hitch weight, feed rate, price
WoodMaxx FAQ: mechanical versus hydraulic feed ↗Question 1
Woodland Mills WC68 official product page ↗Capacity and hydraulic infeed sections; price
WoodMaxx MX-9900 official product page ↗25 PTO hp minimum and separate 50+ HP full-capacity statement
Current index-linked Farmer-Helper FH-BX42 & 62 manual ↗Printed p2 / PDF p3: 25 minimum and 45 Max PTO HP; 6.5 × 12-inch feed capacity; weights

Inside the range is a screen, not a capacity

WoodMaxx lists 19 PTO hp as WM-8M’s minimum. Mahindra lists the 1626 HST at exactly 19. That passes the published screen with no margin. WoodMaxx’s own wording at 19 hp is 4-inch hardwood or 6-inch softwood, and its FAQ ties full 8-inch softwood to 50+ PTO hp. Read the minimum as the lowest supported tractor, and the capacity statement as a separate expectation.

Margins of one or two horsepower

The 1635 HST’s 26.0 PTO hp clears the 25-hp minimums of MX-9900, FH-BX62S and FH-EFGC155 by 1.0 hp; the Shuttle’s 27.6 clears them by 2.6. The 1626 Shuttle’s 21.5 clears WC68’s 20 by 1.5. These are real passes, but small differences between documents, such as the 1626’s 24.8 table figure versus a 25.9 website card, are comparable in size to the margin. Confirm the rating for the actual tractor before relying on it.

Capacity conditions sit far above the minimum

Woodland Mills asks for over 20 PTO hp to run WC46’s full 4-inch logs at full feed, and over 40 for WC68’s full 6-inch logs, inside ranges that start at 15 and 20. WoodMaxx gives MX-9900 a 25-hp minimum and a separate 50+ HP full-capacity statement. A tractor near the minimum is supported by the published range, but the maker expects slower feeding or smaller material.

Do not round toward the minimum

A 19-hp tractor is 1.0 hp below a 20-hp minimum, and a 21.5-hp tractor is 0.5 hp below a 22-hp minimum. There is no documented allowance for rounding, and engine horsepower cannot be substituted where a maker asks for PTO horsepower. If a maker’s minimum is close to your rating, ask that maker in writing whether your exact tractor is supported.

Take these questions with you.

What is the exact PTO rating for my tractor’s transmission and serial, and from which document?
At that rating, what material size and feed rate does the attachment maker expect?
Does the maker publish a separate full-capacity power condition, and how far below it am I?
If my rating is within a horsepower of the minimum, will the maker confirm support in writing?

Keep these questions with your exact tractor and attachment details.

Use these questions in my seller brief

FOLLOW THE NUMBERS