Most Common Issues (All Gas Models – Push, Self-Propelled & Riding)
- Engine won't start: Check fuel (fresh, no ethanol over 10%); prime bulb 3–5 times; ensure choke on (cold start); clean/replace spark plug; check oil level (low oil sensor shuts off engine); verify safety switches (brake/clutch engaged, seat occupied on riders).
- Engine runs rough / stalls: Replace air filter; clean fuel cap vent; use fresh gas; adjust carburetor if needed; check spark plug gap (usually 0.030"); inspect fuel lines for cracks.
- Blades won't engage / deck won't cut: Check PTO lever/switch fully engaged; inspect deck belt for wear/slipping/broken; clean grass buildup; ensure blade spindles turn freely; tighten blade bolts to spec.
- Weak / uneven cut: Sharpen or replace blades; balance blades; level deck (adjust wheels or hangers); set all tires to equal pressure; avoid mowing wet grass.
- Self-propelled drive slipping / weak (walk-behind): Adjust drive cable; replace worn drive belt; clean transmission pulley; check gear selector linkage; lubricate wheels & axles.
- Riding mower won't move forward/reverse: Release parking brake fully; check transmission bypass lever in normal position; inspect drive belt routing & tension; ensure hydrostatic fluid level (if applicable); test safety interlock switches.
Riding & Lawn Tractor Models (Murray Select, Classic Riders)
- Battery dead / slow cranking: Clean terminals; charge or replace battery (common after storage); check alternator/stator charging; use trickle charger in off-season.
- Steering loose or hard: Lubricate front axle & steering gear; check tie rods & drag link; tighten steering sector gear.
- Excessive vibration: Blade unbalanced/bent/damaged – replace; check spindle bearings; inspect engine crankshaft key; tighten all mounting bolts.
General Maintenance & Safety
- Engine smokes / burns oil: Check oil level (overfill causes smoke); use correct SAE weight; replace worn piston rings/valve seals if excessive.
- Fuel leaks / carburetor drips: Replace old fuel lines; install fresh fuel filter; clean or rebuild carburetor; never store with fuel over winter without stabilizer.
Safety note: Always disconnect spark plug wire before any maintenance, blade work, or cleaning. Wear gloves, eye protection, and sturdy shoes. Never operate without all guards in place. Disengage blades and stop engine before clearing clogs or making adjustments. Keep children and pets away.