Craftsman LT4000 Parts Manual

The Craftsman LT4000 is a riding lawn tractor designed for residential use, featuring a powerful engine, hydrostatic transmission, and durable cutting deck. This parts manual provides detailed diagrams, part numbers, and ordering information for maintenance, repair, and replacement of components. Below are key sections covering identification, engine parts, drive system, cutting deck, electrical system, and troubleshooting.

1. Model Identification & Specifications 2. Engine Assembly & Components 3. Drive System & Transmission 4. Cutting Deck & Blade Assembly 5. Electrical System & Wiring 6. Controls & Operator Station 7. Frame, Axle & Wheels 8. Belts, Pulleys & Spindles 9. Maintenance Schedule 10. Parts Ordering Information 11. Troubleshooting & Service Tips

Model Identification & Specifications

Locate the model and serial number plate on the frame under the seat or on the dash. Example: Model 917.XXXXXX, Serial 010101X010101.

Specification	Description
Engine	19.5 HP Briggs & Stratton Intek OHV Twin Cylinder
Transmission	Hydrostatic, 6-speed (Forward/Reverse)
Cutting Width	42 inches (3-blade deck)
Fuel Capacity	2.5 gallons
Oil Capacity	48 oz (with filter)
Battery	12V, 280 CCA
Tire Size (Front)	15x6.00-6
Tire Size (Rear)	20x10.00-8
Weight	Approx. 500 lbs
Deck Engagement	Manual PTO lever

Engine Assembly & Components

Briggs & Stratton Model 407777-XXXX. Includes air filter, carburetor, spark plug, oil filter, fuel pump, starter, and muffler.

Cylinder Head: Part # 692656; includes valves, springs.
Carburetor Kit: Part # 799856; rebuild kit for fuel issues.
Air Filter: Part # 492932S; replace annually or every 100 hours.
Spark Plug: Champion RC12YC; gap 0.030 inches.
Oil Filter: Part # 492932S; change every 50 hours.

WARNING! Disconnect spark plug wire before servicing engine. Allow engine to cool.

Drive System & Transmission

Tuff Torq K46 hydrostatic transmission. Includes drive belt, pulley, axle, and differential.

Drive Belt: Part # 144959; ½" x 95" for engine to transmission.
Transaxle Assembly: Part # 918-04533; complete unit.
Hydrostatic Fluid: 20W50 motor oil or Tuff Torq oil.
Brake Pad Kit: Part # 532401974; for parking brake.
Shift Linkage: Part # 711-3025; connects lever to transmission.

CAUTION! Do not overfill transmission fluid. Check for leaks after service.

Cutting Deck & Blade Assembly

Deck Shell: Part # 532401974; 42-inch stamped steel.
Blade: Part # 942-0744; 18-7/16" length, 2.5" width.
Spindle Assembly: Part # 873-04050A; includes bearing and housing.
Deck Belt: Part # 144959; ½" x 95" for deck drive.
Mandrel Kit: Part # 532144852; replaces worn spindles.
Deck Wheels: Part # 532122274; anti-scalp rollers.
Baffle: Part # 532122274; for improved grass discharge.
Deck Hanger: Part # 711-3025; connects deck to frame.

Electrical System & Wiring

12V system with key ignition, solenoid, starter, battery, and safety switches.

Key Components: Battery (Part # 725-0266), Starter Motor (Part # 492932S), Ignition Switch (Part # 925-0266), Solenoid (Part # 925-0266), Voltage Regulator (Part # 925-0266).

Wiring Diagram: Color-coded for easy tracing. Fuse: 20A in-line near battery. Safety Switches: Seat, brake, PTO interlock. Lights: Optional headlight kit (Part # 942-0744).

Controls & Operator Station

Steering wheel, seat, pedals, levers, and dash.

Seat: Part # 532122274; high-back with springs.
Steering Wheel: Part # 532122274; 13-inch diameter.
Brake Pedal: Part # 711-3025; includes return spring.
PTO Lever: Part # 532144852; engages cutting deck.
Throttle/Choke Control: Part # 532144852; dash-mounted.

Tip: Lubricate control linkages annually with white lithium grease.

Frame, Axle & Wheels

Heavy-duty steel frame with front and rear axles.

Front Axle: Part # 918-04533; pivot type for steering.
Rear Axle: Integrated with transaxle.
Wheel Hub: Part # 532401974; front and rear.
Tire & Tube: Front (15x6.00-6), Rear (20x10.00-8).
Frame Reinforcement Kit: Part # 942-0744 for cracks.

WARNING! Inspect frame for cracks annually. Replace damaged parts immediately.

Belts, Pulleys & Spindles

Drive and deck belt routing diagrams included.

Part	Part Number	Description
Drive Belt	144959	Engine to transmission
Deck Belt	144959	Engine to deck
Idler Pulley	532144852	Spring-loaded tensioner
Spindle Pulley	873-04050A	Top of spindle assembly
Mandrel Bearing	873-04050A	Sealed ball bearing

Maintenance Schedule

Regular maintenance ensures longevity and performance.

Every 25 hours: Check tire pressure, inspect belts, lubricate fittings. Every 50 hours: Change engine oil and filter, check battery. Every 100 hours: Replace air filter, spark plug, inspect blades. Seasonal: Sharpen blades, clean deck, check transmission fluid.

CAUTION! Use only recommended fluids and parts. Dispose of oil properly.

Parts Ordering Information

Order genuine Craftsman parts through authorized dealers or online.

Website: www.craftsman.com/parts
Phone: 1-888-331-4569
Dealer Locator: Use website to find local service centers.
Parts Lookup: Enter model number for exploded diagrams.
Shipping: Standard 5-7 business days; expedited available.
Warranty: 90-day limited warranty on replacement parts.

Troubleshooting & Service Tips

Symptom	Possible Cause	Corrective Action
Engine won't start	Dead battery, bad solenoid, fuel issue	Check battery charge; test solenoid; ensure fuel valve on.
Loss of power	Clogged air filter, old spark plug	Replace air filter and spark plug; check fuel filter.
Deck vibration	Bent blade, worn spindle	Inspect and replace blade; check spindle bearings.
Hydrostatic issues	Low fluid, worn belt	Check fluid level; inspect drive belt for wear.
Uneven cutting	Deck not level, dull blades	Level deck; sharpen or replace blades.

Service Manual: Available separately (Part # 917-04001).

Support: 1-888-331-4569; www.craftsman.com