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MTD 70 Series - User Manual

MTD 70 Series
142 pages
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Professional Shop Manual
61, 65 and 70 Series Vertical Shaft Engines
MTD Products Inc. - Product Training and Education Department
NOTE: These materials are for use by trained technicians who are experienced in the service and repair of outdoor power
equipment of the kind described in this publication, and are not intended for use by untrained or inexperienced individuals.
These materials are intended to provide supplemental information to assist the trained technician. Untrained or inexperi-
enced individuals should seek the assistance of an experienced and trained professional. Read, understand, and follow all
instructions and use common sense when working on power equipment. This includes the contents of the product’s Oper-
ators Manual, supplied with the equipment. No liability can be accepted for any inaccuracies or omission in this publication,
although care has been taken to make it as complete and accurate as possible at the time of publication. However, due to
the variety of outdoor power equipment and continuing product changes that occur over time, updates will be made to these
instructions from time to time. Therefore, it may be necessary to obtain the latest materials before servicing or repairing a
product. The company reserves the right to make changes at any time to this publication without prior notice and without
incurring an obligation to make such changes to previously published versions. Instructions, photographs and illustrations
used in this publication are for reference use only and may not depict actual model and component parts.
© Copyright 2013 MTD Products Inc. All Rights Reserved

Table of Contents

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MTD 70 Series Specifications

General IconGeneral
BrandMTD
Model70 Series
CategoryEngine
LanguageEnglish

Summary

Chapter 1: Introduction

Safety

Emphasizes reading operator's manual and using safety precautions for equipment.

Maintenance

Lists recommended maintenance intervals for various items like oil, filters, and plugs.

Spark plugs

Discusses spark plug types, gapping, cleaning recommendations, and inspection indicators.

Oil type and capacity

Specifies recommended oil, capacity, and considerations for synthetic vs. petroleum oil.

Changing the oil

Details three methods for changing engine oil: siphon, drain plug, and tipping.

General torque specifications

Provides a chart of torque values for various fastener sizes and grades.

Chapter 2: Basic Troubleshooting

Steps to troubleshooting

Outlines a suggested approach to troubleshooting MTD engines, emphasizing safety.

Define the problem

Lists common engine problems like crankshaft not turning or no start, categorized by symptoms.

Identify factors that could cause the problem

Identifies potential causes for engine issues like crankshaft not turning, no start, and poor running.

Compression test

Describes how to perform a compression test and interpret the readings.

Chapter 3: Air Intake System

Air filter

Describes MTD air filters and how to access them for maintenance.

Carburetor Insulator

Explains how to remove and replace the carburetor insulator, including safety precautions.

Chapter 4: The Fuel System and Governor

Fuel Line

Discusses MTD's GREENBAR fuel line, its construction, and replacement requirements.

The fuel filter

Explains the location and replacement of fuel filters, including in-line types.

Carburetors

Discusses troubleshooting carburetors via elimination and provides steps for inspection.

Disassembly and rebuilding the carburetor

Details steps for disassembling the carburetor, including float bowl and float removal.

Governor

Explains how engine speed is controlled by the governor mechanism.

Chapter 5: Lubrication

Oil type and quantity

Specifies recommended oil, capacity, and considerations for synthetic vs. petroleum oil.

Lubrication system

Explains MTD's splash lube system, oil passages, and the importance of oil level.

PCV

Explains PCV valve location and service procedures, including cover and gasket separation.

Chapter 6: Starter and Charging Systems

Recoil Starter Removal

Provides steps for removing the recoil starter assembly from the engine, including shroud removal.

Starter Rope

Details the process of replacing a broken recoil starter rope, including winding and tensioning.

Electric starter relay

Explains the function of the electric starter relay and how to remove/replace it.

Chapter 7: Ignition System

Troubleshooting the ignition system

Covers troubleshooting steps for the ignition system, including spark tester use.

Troubleshooting the stop switch

Details how to test the stop switch using an ohmmeter or jumper wire.

Ignition module

Describes types of ignition modules and their operation.

Flywheel

Describes flywheel types and the procedure for removing the flywheel.

Chapter 8: Exhaust

To remove;replace the conventional muffler

Provides steps for removing and replacing conventional mufflers.

Catalytic converter muffler

Explains the function and identification of catalytic converter mufflers and the air injector.

Chapter 9: Cylinder Head

To remove the cylinder head

Outlines the initial steps for removing the cylinder head, including engine preparation.

Valves

Explains valve servicing options and the process for removing rocker arms and valves.

Chapter 10: Crankshaft, Piston and Connecting Rod

Crank shaft inspection

Details procedures for inspecting crankshaft journals, crankpin, and checking for run out.

Piston Inspection

Describes how to measure piston ring end gap and install rings onto the piston.

Reassembly

Outlines cleaning, oil seal installation, and crankshaft insertion for engine reassembly.

Engine torque values chart

Lists torque specifications for various engine fasteners across different models.

Chapter 11: Failure Analysis

Abrasive Ingestion

Explains how abrasive particles enter the engine and cause wear.

Insufficient lubrication

Explains the functions of engine oil and common causes of lubrication failure.

Overheated

Describes how engine overheating causes warped parts, head gasket leaks, and potential damage.

Mechanical Breakage; Wear

Discusses causes of part breakage like abuse, wear, and manufacturing defects, including bent crankshafts.

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