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MTD 678 lawn tractor Parts
Here are the diagrams and repair parts for MTD 678 lawn tractor, as well as links to manuals and error code tables, if available.
Owner’s manualBy Schematic
By Part
SELECT DIAGRAM
Browse Parts for 678 Riding Mowers & Tractors
Light Switch
Part #725-0634Replaced by #925-0634
Manufacturer substitutionThis part replaces 725-0634. Substitute parts can look different from the original.In Stock$49.95
Qty
Steering diagram
Rod-tie-non
Part #747-0861Replaced by #747-0861-0637
Manufacturer substitutionThis part replaces 747-0861. Substitute parts can look different from the original.In Stock$43.0312% OFF Phone Price : $49.03
QtyDeck "g" diagram
Belt Guard
Part #783-0149Replaced by #783-0149B-0637
Manufacturer substitutionThis part replaces 783-0149. Substitute parts can look different from the original.In Stock$59.709% OFF Phone Price : $65.70QtyTransmission diagram
Retainer Ring
Part #716-0171Replaced by #916-0171
Manufacturer substitutionThis part replaces 716-0171. Substitute parts can look different from the original.This item is not returnableIn Stock$32.72QtyDeck "h" diagram
Pulley
Part #756-0627Replaced by #756-0627D
Manufacturer substitutionThis part replaces 756-0627. Substitute parts can look different from the original.In Stock$38.7513% OFF Phone Price : $44.75QtySeat and main frame diagram
Fuel Tank
Part #751-0553Replaced by #751-0555D
Manufacturer substitutionThis part replaces 751-0553. Substitute parts can look different from the original.In Stock$159.30QtyDrive diagram
Splined Transaxle
Part #656-0005
The manufacturer no longer makes this part, and there's no substitute part
Speed control diagram
Spacer
Part #750-0662
The manufacturer no longer makes this part, and there's no substitute part
Steering diagram
Bell Washer
Part #736-0356
The manufacturer no longer makes this part, and there's no substitute part
Steering diagram
Spoked Hub Cap (gray-opt.)
Part #734-16134
The manufacturer no longer makes this part, and there's no substitute part
Most common symptoms to help you fix your riding mowers & tractors
Choose a symptom to see related riding mower and lawn tractor repairs.
Main causes: damaged tie rods, bent or worn wheel spindle, worn front axle, damaged sector gear assembly…
Main causes: dead battery, stale fuel, bad starter solenoid, ignition system problem, bad ignition interlock switch, clo…
Main causes: worn or broken blade belt, broken belt idler pulley, blade clutch cable failure, bad PTO switch, damaged ma…
Main causes: engine overfilled with oil, leaky head gasket or sump gasket, damaged carburetor seals, cracked fuel pump, …
Main causes: punctured tire or inner tube, leaky valve stem, damaged wheel rim…
Main causes: unlevel mower deck, dull or damaged cutting blades, worn mandrel pulleys, bent mower deck, engine needs tun…
Main causes: worn or broken ground drive belt, bad seat switch, transaxle freewheel control engaged, transaxle failure, …
Main causes: faulty battery, bad alternator…
Main causes: shift lever needs adjustment, neutral control needs adjustment…
Most common repair guides to help fix your riding mowers & tractors
These step-by-step repair guides will help you safely fix what’s broken on your riding mower or lawn tractor.
How to replace the starter solenoid on a riding lawn mower
Replace the starter solenoid if it doesn't click when you turn the ignition key.…
Repair time and Difficulty
30 minutes or less
How to replace a riding lawn mower ignition coil
If you're not getting spark from a good spark plug, the problem could be the ignition coil. Follow these step-by-step in…
Repair time and Difficulty
30 minutes or less
How to replace a riding lawn mower fuel filter
Help your mower run better by replacing the fuel filter during your riding mower's annual tune-up.…
Repair time and Difficulty
15 minutes or less
Effective articles & videos to help repair your riding mowers & tractors
Use the advice and tips in these articles and videos to get the most out of your riding mower or lawn tractor.
Get answers to frequently asked questions about Sears and Sears PartsDirect.…
Learn some of the most common symbols found in a wiring diagram and what they mean.…
Learn how to connect cables safely to jump-start your mower’s battery.…
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