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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
Knob
Part #720-0232Replaced by #720-0232
Manufacturer substitutionThis part replaces 720-0232. Substitute parts can look different from the original.This item is not returnableIn Stock$2.16
Qty
Steering diagram
Bar Pivot Assembly
Part #683-0128Replaced by #683-0128B-0637
Manufacturer substitutionThis part replaces 683-0128. Substitute parts can look different from the original.In Stock$110.4710% OFF Phone Price : $122.47
QtySteering diagram
Hex Bearing
Part #741-0656Replaced by #941-0656A
Manufacturer substitutionThis part replaces 741-0656. Substitute parts can look different from the original.This item is not returnableIn Stock$5.0617% OFF Phone Price : $6.06QtyLift diagram
Flange Bearing
Part #741-0313Replaced by #741-0487C
Manufacturer substitutionThis part replaces 741-0313. Substitute parts can look different from the original.This item is not returnableIn Stock$10.7116% OFF Phone Price : $12.71QtyHose-fuel 12
Part #751-0535-12Replaced by #751-10349-13
Manufacturer substitutionThis part replaces 751-0535-12. Substitute parts can look different from the original.In Stock$25.53QtyIntek diagram
Lawn Tractor Engine Exhaust Manifold Gasket
Part #721-0460Replaced by #721P0460
Manufacturer substitutionThis part replaces 721-0460. Substitute parts can look different from the original.This item is not returnableIn Stock$9.2010% OFF Phone Price : $10.20QtyDeck "f" diagram
Bld Dr/b
Part #754-0329AGet free shipping with Automatic ReorderReplaced by #954-0329A
Manufacturer substitutionThis part replaces 754-0329A. Substitute parts can look different from the original.In Stock$58.019% OFF Phone Price : $64.01QtyGrille/ hood and fender diagram
Lawn & Garden Equipment Cable Tie
Part #725-0157Replaced by #726-0178
Manufacturer substitutionThis part replaces 725-0157. Substitute parts can look different from the original.This item is not returnableIn Stock$25.35QtySteering diagram
Mtd Lawn Tractor Nut
In Stock$6.6313% OFF Phone Price : $7.63QtyAircap Lawn & Garden Equipment Spacer
Part #748-0234This item is not returnableIn Stock$8.09Qty
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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