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ELEVENTH

EDITION

UNDERSTANDING

POWER TAKE-OFF SYSTEMS

North American Hydraulic & Power Transmission Products

Muncie Power is one of 115 companies across the world that make up Interpump Group, who is a global leader in water jetting, hydraulics, and power transmission markets. Combined with Interpump Group, we are one of America's largest providers in the hydraulics and power transmission markets.

MUNCIE POWER PRODUCTS AMERICAN MOBILE POWER HYDRA DYNE TECH RR USA WALVOIL WHITE DRIVE

Muncie Power is a leading manufacturer of power take-offs and provider of hydraulic components.

An Exclusive Provider

Rear- and engine-mount PTOs, pumps motors, tipper valves,

and cylinders.

A complete line of hose, fittings, machines, and

accessories.

TABLE OF CONTENTS

POWER TAKE-OFF DEFINED......................... 3

SECTION 1 A BRIEF HISTORY...........................................4

Single gear PTOs Multi-gear PTOs Reversible PTOs 8-bolt PTOs Clutch shift PTOs

SECTION 2 TRANSMISSION APERTURE ..........................6

SAE Standards pertaining to transmission mounted PTOs

Pitch line

SECTION 3 POWER TAKE-OFF INPUT GEAR...................... 7

Spur and helical gear types

SECTION 4 POWER TAKE-OFF SPEED AND ROTATION ...................................................... 8

Determining PTO shaft speed Engine crank rotation

SECTION 5 POWER TAKE-OFF SELECTION........................ 9

What you need to know Muncie Power PTO assembly arrangements

SECTION 6 MUNCIE POWER PTO MODEL NUMBER ....................................................11

TG model number construction chart A20 model number construction chart F20 model number construction chart

SECTION 7 PTO TORQUE AND HORSEPOWER REQUIREMENTS.....................14

SECTION 8 ADAPTER GEAR ASSEMBLIES ........................ 15

SECTION 9 INTERMITTENT AND CONTINUOUS DUTY CYCLES.........................................................16

Common PTO applications

SECTION 10 TYPES OF POWER TAKE-OFFS........................ 17

Mechanical Clutch shift Shiftable input and constant mesh

SECTION 11 POWER TAKE-OFF INSTALLATION................ 18

Backlash Direct-coupled hydraulic pumps Shaft driven equipment

SECTION 12 OVERSPEED PROTECTION DEVICES............ 22

SECTION 13 MUNCIE START?................................................... 23

SECTION 14 WHERE TO FIND IT............................................. 24

Body builders Transmission manufacturers

SECTION 15 CONVERSION CHARTS, ABBREVIATIONS, AND FORMULAS...........................................25

English Units (U.S.) to Syst?me International (Metric)

Abbreviation equivalents Formulas for calculator use

INDEX........................................................................ 27

NOTES...................................................................... 28

POWER TAKE-OFF DEFINED

Power take-offs (PTOs) are mechanical gearboxes that attach to apertures provided on truck transmissions and are used to transfer the power of the vehicle engine to auxiliary components, most commonly a hydraulic pump. The hydraulic flow generated by the pump is then directed to cylinders and or hydraulic motors to perform work. In some PTO applications such as generators, air compressors, pneumatic blowers, vacuum pumps and liquid transfer pumps, the PTO provides power, in the form of a rotating shaft, directly to the driven component.

The PTO we are most familiar with is the side-mounted PTO, although there are also models that attach to the rear of certain transmissions and split shaft PTOs that are mounted by removing a section of the vehicle's main driveline. Rear-mounted PTOs are frequently referred to as countershaft PTOs; however, many sidemounted PTOs are also countershaft PTOs because they are driven by gears on the transmission's counter shaft. You may hear people refer to "side countershaft" and "rear countershaft" PTOs to make a distinction.

The transmissions commonly found in class 4 and larger vehicles will have provisions for the mounting of a PTO. Generally there are two apertures, one on each side of the transmission, but some smaller transmissions may have only one. When discussing aperture location one refers to the passenger side of the truck as the "right" and the driver's side as the "left." Many popular Eaton Fuller transmissions have a PTO aperture on the bottom (offset to the left), and some Allison automatic transmissions have a top aperture.

The PTO may be engaged by means of a cable, lever, air pressure, electric/air, electric, or hydraulic pressure.

Various output shaft configurations are available to allow for a driveshaft connection or the attachment of hydraulic pumps directly to the PTO without an intermediate shaft. The Society of Automotive Engineers (SAE) has established standard mounting face dimensions for hydraulic pumps and PTOs are made to accept these. These are referred to, from smallest to largest, as the SAE A, B, D, E, and F.

TRUCK CLASSIFICATION BY GVWR

(Gross Vehicle Weight Rating) Class 1 Less than 6,000 lb. Class 2 6,001 ? 10,000 lb. Class 3 10,001 ? 14,000 lb. Class 4 14,001 ? 16,000 lb. Class 5 16,001 ? 19,500 lb. Class 6 19,501 ? 26,000 lb. Class 7 26,001 ? 33,000 lb. Class 8 33,000 lb. and up

Transmission with PTO and hydraulic pump installed

Air Shift Cover

Cable Shift Cover

Lectra Shift Cover Understanding Power Take-off Systems | | 3

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