Yard Machines 660-679 Series User Manual

12.5HP /38"
SHIFT-ON-THE-GO
IMPORTANT: READ SAFETY RULES AND INSTRUCTIONS CAREFULLY
MTD PRODUCTS INC. P.O. BOX 368022 CLEVELAND, OHIO 44136-9722
Model Series
660 thru 679
TRANSMATIC
LAWN TRACTORS
PRINTED IN U.S.A. FORM NO. 770-8637A
O
PERATOR’S
M
ANUAL
Warning:
This unit is equipped with an internal combustion engine and should not be used on or near any unimproved forest-
covered, brush-covered or grass-covered land unless the engine’s exhaust system is equipped with a spark arrester meeting
applicable local or state laws (if any). If a spark arrester is used, it should be maintained in effective working order by the operator.
In the State of California the above is required by law (Section 4442 of the California Public Resources Code). Other states may have
similar laws. Federal laws apply on federal lands. A spark arrester for the muffler is available through your nearest engine authorized
service dealer or contact the service department, P.O. Box 368022 Cleveland, Ohio 44136-9722.

Yard Machines 660-679 Series Specifications

General

Engine	Briggs & Stratton
Engine Displacement	190cc
Drive System	Self-Propelled
Mulching Capability	Yes
Side Discharge	Yes
Rear Bag	Yes
Cutting Height	1.25 - 3.75 inches
Cutting Height Positions	6
Oil Capacity	20 oz
Bagger Capability	Yes
Wheel Size	8 inches (front)

Summary

Section 1: Important Safe Operation Practices

General Operation Safety

Covers essential safety rules and instructions for operating the lawn mower.

Slope Operation Guidelines

Safe Slope Operation

Guidelines for safe operation on slopes, including do's and don'ts.

Children and Service Safety

Child Safety Precautions

Warnings and instructions to prevent accidents involving children.

Fuel Handling and Service Safety

Slope Gauge Tool

Using the Slope Gauge

Section 4: Unpacking and Assembly

Battery Handling Precautions

Essential safety warnings and procedures for handling the battery and acid.

Battery Activation and Steering Installation

Battery Identification and Charging

Section 6: Controls

Engine Starting and Speed Controls

Operation of ignition, throttle, choke, and speed controls for engine management.

Transmission and Braking Controls

Using the shift lever, clutch-brake pedal, and parking brake.

Cutting and Parking Controls

Parking Brake, Interlocks, and Indicators

Setting the parking brake, understanding safety interlocks, and indicator lights.

Cutting Height Adjustment

Section 7: Operation

Gas and Oil Fill-Up Procedures

Starting and Stopping the Engine

Safely Starting the Engine

Step-by-step guide to safely start the tractor's engine using interlocks.

Stopping the Engine Correctly

Operating the Lawn Tractor

Driving and Braking Instructions

Instructions for moving the tractor forward, backward, and stopping.

Mowing Operations and Adjustments

Operating Cutting Blades and Grass Collection

Section 8: Adjustments

Deck and Speed Control Adjustments

Deck Engagement Adjustment

Speed Control Adjustment

Wheel, Brake, and Carburetor Adjustments

Wheel Toe-In and Brake Adjustment

Section 9: Lubrication

Section 10: Maintenance

Cutting Blades and Battery Maintenance

Cutting Blades Maintenance

Battery Care and Charging

Belt Removal and Replacement

Deck Belt Replacement

Rear Drive Belt Replacement

Front Drive Belt and Storage

Front Drive Belt Replacement

Off-Season Storage Preparation

Instructions for preparing the tractor for long-term storage.

Section 12: Trouble Shooting Guide

Engine Starting Problems

Troubleshooting common issues preventing the engine from starting.

Engine Operation Issues

Diagnosing and resolving problems like engine smoking or vibration.

Mowing Performance Issues

Addressing problems with grass discharge, cutting quality, and uncut strips.

Manufacturer's Limited Warranty

Warranty Coverage and Terms

Details of the two-year limited warranty and coverage exclusions.

Obtaining Warranty Service

How to get warranty service and contact MTD Products Inc.

Warranty Limitations and State Law