MTD 75 series - User Manual

Professional Shop Manual
61/65/70/75 Series Horizontal 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

MTD 75 series Specifications

General

Brand	MTD
Model	75 series
Category	Engine
Language	English

Summary

CHAPTER 1: INTRODUCTION

Spark Plug, Air Filter, and Oil Service

Covers service for spark plugs, air filters, and engine oil.

Fuel System and Valve Lash Adjustment

Details fuel filter replacement and valve lash adjustment.

CHAPTER 2: BASIC TROUBLESHOOTING

Problem Identification and Diagnosis

Details defining problems, identifying causes, and analyzing engine operation issues.

Diagnostic Tests and Procedures

Explains prime, leak-down, compression, and PCV tests.

CHAPTER 4: THE FUEL SYSTEM AND GOVERNOR

Carburetor Inspection and Service

Covers carburetor inspection, disassembly, rebuilding, and adjustments.

CHAPTER 5: LUBRICATION

Oil Specifications and Level Check

Recommends oil types, capacity, and details the oil level check procedure.

CHAPTER 6: STARTER AND CHARGING SYSTEMS

Recoil Starter Assembly Service

Covers recoil starter, cup, rope, pulley, and spring service.

CHAPTER 7: IGNITION SYSTEM

Spark Plug Service

Details spark plug examination, cleaning, removal, and installation.

Ignition Module and Flywheel Service

Covers module testing, air gap setting, and flywheel inspection/installation.

CHAPTER 8: EXHAUST

Spark Arrestor and Muffler Service

Covers spark arrestor cleaning/replacement and muffler service.

CHAPTER 9: CYLINDER HEAD

Cylinder Head Removal and Installation

Details steps for removing and installing the cylinder head.

Valve Service and Inspection

Covers valve retainers, springs, seats, stems, and leak testing.

CHAPTER 10: CRANKSHAFT, PISTON AND CONNECTING ROD

Crankshaft Inspection and Measurement

Details inspecting crankshaft journals, pins, and checking for run out.

Piston and Cylinder Inspection

Connecting Rod and Bearing Inspection

Engine Reassembly Procedures

CHAPTER 11: FAILURE ANALYSIS

Abrasive Ingestion Analysis

Insufficient Lubrication Analysis

Overspeed and Overheating Failures

Mechanical Breakage and Detonation;Preignition