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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
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By Part
SELECT DIAGRAM
Browse Parts for 678 Riding Mowers & Tractors
Hex Washer
Part #710-0604Replaced by #710-0604A
Manufacturer substitutionThis part replaces 710-0604. Substitute parts can look different from the original.This item is not returnableIn Stock$6.6313% OFF Phone Price : $7.63
Qty
Drive diagram
Idler Bracket
Part #17643Replaced by #17643-0637
Manufacturer substitutionThis part replaces 17643. Substitute parts can look different from the original.In Stock$19.40QtyPlug:mulch 3
Part #731-1643AReplaced by #OEM-190-116
Manufacturer substitutionThis part replaces 731-1643A. Substitute parts can look different from the original.In Stock$108.3610% OFF Phone Price : $120.36QtyDeck "f" diagram
Spindle Assembly
Part #618-0138Replaced by #918-0138C
Manufacturer substitutionThis part replaces 618-0138. Substitute parts can look different from the original.In Stock$193.52QtyTransmission diagram
Puck Plate
Part #717-0682Replaced by #917-0682
Manufacturer substitutionThis part replaces 717-0682. Substitute parts can look different from the original.In Stock$18.17QtyTecumseh diagram
Exhaust Pipe
Part #751-0620Replaced by #751-0620A
Manufacturer substitutionThis part replaces 751-0620. Substitute parts can look different from the original.In Stock$92.946% OFF Phone Price : $98.94QtySteering diagram
Spacer
Part #750-0535Replaced by #950-0535
Manufacturer substitutionThis part replaces 750-0535. Substitute parts can look different from the original.This item is not returnableIn Stock$8.20QtyLift diagram
Bell Washer
Part #736-0425Replaced by #936-0425
Manufacturer substitutionThis part replaces 736-0425. Substitute parts can look different from the original.In Stock$30.59QtyDeck "h" diagram
Gauge Pin Belt
Part #711-0993Replaced by #911-0993
Manufacturer substitutionThis part replaces 711-0993. Substitute parts can look different from the original.In Stock$29.61QtyDrive diagram
Speed Belt
Part #754-0280Get free shipping with Automatic ReorderReplaced by #954-0280A
Manufacturer substitutionThis part replaces 754-0280. Substitute parts can look different from the original.In Stock$57.409% OFF Phone Price : $63.40Qty
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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