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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
Deck "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 : $44.75
Qty
Grille/ hood and fender diagram
Choke Control
Part #746-0616AReplaced by #946-0616A
Manufacturer substitutionThis part replaces 746-0616A. Substitute parts can look different from the original.In Stock$56.61QtyTwin Muffler
Part #751-0616Replaced by #951-0616B
Manufacturer substitutionThis part replaces 751-0616. Substitute parts can look different from the original.In Stock$170.787% OFF Phone Price : $182.78QtyDrive diagram
Air Valve
Part #734-0255Replaced by #934-0255
Manufacturer substitutionThis part replaces 734-0255. Substitute parts can look different from the original.This item is not returnableIn Stock$7.5412% OFF Phone Price : $8.54QtySwitch
Part #725-1396Replaced by #01003581P
Manufacturer substitutionThis part replaces 725-1396. Substitute parts can look different from the original.In Stock$120.50QtyGrille/ hood and fender diagram
Hood
Part #683-0167Replaced by #983-0478B
Manufacturer substitutionThis part replaces 683-0167. Substitute parts can look different from the original.In Stock$345.93QtySteering diagram
Nut
Part #712-0431Replaced by #912-0431
Manufacturer substitutionThis part replaces 712-0431. Substitute parts can look different from the original.This item is not returnableIn Stock$8.9410% OFF Phone Price : $9.94QtyDeck "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$29.61QtySeat 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 : $13.55Qty7 speed selector diagram
Shield Bolt
Part #738-0155Replaced by #938-0155
Manufacturer substitutionThis part replaces 738-0155. Substitute parts can look different from the original.In Stock$34.32Qty
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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