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MTD 660 - User Manual

MTD 660
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FORM NO.
769-00533A.fm
(4/2003)
PRINTED IN U.S.A.
Operator’s Manual
Transmatic Lawn Tractor
MODELS 660, 680
662, 682
663, 683
665, 685
668, 688
IMPORTANT: READ SAFETY RULES AND INSTRUCTIONS CAREFULLY
MTD LLC, P.O. BOX 361131 CLEVELAND, OHIO 44136-9722
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 361131 Cleveland, Ohio 44136-9722.

Table of Contents

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Preview: Illustrated Parts Manual
Illustrated Parts Manual24 pages

Questions and Answers

  • L
    Laurie HansenJul 30, 2025
    Why does my MTD 660 engine crank but not start?
    • M
      Michael LambertJul 30, 2025
      If your MTD Lawn Mower engine cranks but doesn't start, several factors could be at play. Make sure the throttle or choke is in the correct starting position by consulting your operator's manual. Check if the gasoline tank is empty and fill it if needed. Inspect the fuel line or in-line fuel filter for any blockages and clean them if necessary. Ensure the spark plug lead is securely connected. If the spark plug is faulty and doesn't fire at the electrode, replace it. If the air cleaner is dirty, refer to the engine manual packed with your unit for cleaning instructions.
  • K
    kimberlyblackAug 5, 2025
    How to fix MTD 660 Lawn Mower that won't discharge grass or leaves uncut strips?
    • A
      Amber MillerAug 5, 2025
      If your MTD Lawn Mower isn't discharging grass properly or leaves uncut strips, it could be due to a few reasons. Ensure the engine speed is set to full throttle. Try using a lower ground speed. If the cutting height is too low, raise the deck. Also, check if the blades are short or dull; sharpen or replace them as needed.
  • M
    manueldeckerAug 11, 2025
    What to do if my MTD 660 engine will not crank?
    • A
      Alyssa ParsonsAug 11, 2025
      If your MTD Lawn Mower engine won't crank, it could be due to several reasons. First, ensure the safety switch button is fully depressed by the actuator. Check that the battery is correctly installed with the negative terminal connected to the black ground wire. The battery might be dead or weak, so ensure it's fully charged before installation. Also, inspect the fuse or circuit breaker and replace it with an automotive type fuse if blown. Finally, check the engine ground wire to ensure it's properly connected from the engine to the frame or mounting bolt.
  • A
    Adam CohenAug 17, 2025
    Why is my MTD Lawn Mower engine smoking?
    • L
      Laurie HarmonAug 17, 2025
      If your MTD Lawn Mower engine is smoking, it may be due to overfilling the engine oil; check the oil level. Another potential cause is the engine losing crankcase vacuum, which means the engine breather may be defective and needs replacement.
  • M
    Matthew EstradaAug 22, 2025
    What causes excessive vibration in my MTD 660 Lawn Mower?
    • J
      Julie SmithAug 23, 2025
      Excessive vibration in your MTD Lawn Mower can be caused by a bent or damaged blade, which would need to be replaced. It can also be caused by a bent blade, so check all pulleys, blade adapters, keys, and bolts for tightness and spindle damage.

Summary

Important Safe Operation Practices

General Operation Safety

Key safety rules and operational guidelines for safe use of the machine.

Slope Operation Safety

Guidelines for safe operation on slopes, including what to do and not do.

Children Safety

Safety precautions regarding children around the machine.

Operator Responsibility

Emphasizes operator's duty to read and follow safety instructions and warnings.

Tractor Set-up

Gas and Oil Fill-up

Guidance on filling the tractor's fuel tank and checking oil levels before operation.

Know Your Lawn Tractor

Deck Engagement; Lift Lever

Operating the Lawn Tractor

Safety Interlock System

Explanation of safety features preventing operation under certain conditions.

Starting the Engine

Step-by-step guide for starting the tractor's engine safely.

Stopping the Engine

Procedures for safely shutting down the tractor's engine.

Engaging the Cutting Blades

How to engage and disengage the cutting deck blades.

Mowing

Making Adjustments

Deck Leveling Adjustment

Steering Adjustments

Maintaining Your Lawn Tractor

Engine Maintenance

Refer to the engine manufacturer's manual for specific engine maintenance instructions.

Changing Engine Oil

Steps for changing the engine oil using a drain sleeve or valve.

Service

Cutting Deck Removal

Cutting Blades

Procedures for sharpening, balancing, and replacing cutting blades.

Belt Replacement

Drive Belts Replacement (Upper & Lower)

Trouble Shooting Guide

MTD 660 Specifications

General IconGeneral
Engine Displacement190cc
Fuel Tank Capacity1.32 qt
Deck MaterialSteel
Starter TypeRecoil
Mulching CapabilityYes
Bagging CapabilityYes
Side Discharge CapabilityYes
Engine Type4-Cycle
Cutting Height1.25 - 3.75 in
Wheel Size8 x 8 in

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