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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 manual
By Schematic
By Part
SELECT DIAGRAM
Browse Parts for 678 Riding Mowers & Tractors
Deck "h" diagram
Lawn Tractor Hex Bolt
Part #710-3151Replaced by #710-3151A
Manufacturer substitutionThis part replaces 710-3151. Substitute parts can look different from the original.This item is not returnableIn Stock$28.23
Qty
Seat and main frame diagram
Switch
Part #725-1303Replaced by #925-1303
Manufacturer substitutionThis part replaces 725-1303. Substitute parts can look different from the original.In Stock$11.5515% OFF Phone Price : $13.55
QtyTransmission diagram
Flange Bearing
Part #741-0336Replaced by #941-0336
Manufacturer substitutionThis part replaces 741-0336. Substitute parts can look different from the original.This item is not returnableIn Stock$17.1110% OFF Phone Price : $19.11QtyTrsn Sprng
Part #732-0602Replaced by #732-0602A
Manufacturer substitutionThis part replaces 732-0602. Substitute parts can look different from the original.In Stock$19.06QtyHex Nut
Part #712-0267Replaced by #712-3010
Manufacturer substitutionThis part replaces 712-0267. Substitute parts can look different from the original.In Stock$55.5910% OFF Phone Price : $61.59QtyWasher
Part #736-0349Replaced by #936-0349
Manufacturer substitutionThis part replaces 736-0349. Substitute parts can look different from the original.This item is not returnableIn Stock$6.49QtyDrive diagram
Idler Bracket
Part #17694Replaced by #17694-0637
Manufacturer substitutionThis part replaces 17694. Substitute parts can look different from the original.In Stock$48.00QtySteering diagram
Lawn Mower Dust Cover
Part #731-0484AReplaced by #931-0484A
Manufacturer substitutionThis part replaces 731-0484A. Substitute parts can look different from the original.In Stock$9.2510% OFF Phone Price : $10.25QtyTransmission diagram
Complete Spring
Part #732-0863Replaced by #932-05125
Manufacturer substitutionThis part replaces 732-0863. Substitute parts can look different from the original.This item is not returnableIn Stock$7.66QtyDeck "h" diagram
Skirt-deck C
Part #783-0141Replaced by #783-0141-0637
Manufacturer substitutionThis part replaces 783-0141. Substitute parts can look different from the original.In Stock$128.18Qty
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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