The Murray 7800369 is a 21-inch push lawn mower featuring a 190cc Briggs & Stratton engine, 3-in-1 mulching/bagging/side discharge capability, single-lever height adjustment, durable steel deck, easy-start system, and rear-wheel drive. This manual covers safety, assembly, operation, maintenance, troubleshooting, and storage. Always read and follow all safety instructions before use.
Key components: 190cc Briggs & Stratton engine, 21-inch steel cutting deck, rear bagger, mulching plug, side discharge chute, single-lever height adjustment, rear-wheel drive system, and recoil starter.
| Feature | Description |
|---|---|
| Engine | 190cc Briggs & Stratton 4-cycle OHV engine |
| Cutting Width | 21 inches |
| Cutting Deck | Durable steel construction |
| Discharge Options | Mulch, Bag, Side Discharge (3-in-1) |
| Height Adjustment | Single-lever, 6 positions (1.5-3.75 inches) |
| Drive System | Rear-wheel drive |
| Starting System | Recoil starter with easy-start technology |
| Fuel Tank | 1.0-gallon capacity |
| Wheels | 8-inch rear, 7-inch front |
| Weight | Approximately 65 lbs |
Unpack all parts and inspect for damage. Assembly requires basic tools (included).
WARNING! Do not attempt to start engine before adding oil and fuel. Keep hands and feet clear of cutting blade during assembly.
Always follow these safety rules to prevent serious injury or death.
DANGER! Rotating blade can cause severe injury. Keep hands and feet away from deck at all times.
Handle Controls: Drive control lever (squeeze to engage drive), height adjustment lever, engine control (stop) cable.
Starting Procedure:
Stopping: Release drive control, move throttle to STOP, wait for blade to stop completely.
Operating Tips: Mow at steady pace, overlap passes by 2-3 inches, avoid mowing wet grass.
Single-lever adjustment for all four wheels.
Recommended Settings: 2.5-3 inches for most grasses, higher for uneven terrain, lower for formal lawns.
CAUTION! Always adjust height with engine off and blade stopped.
Configure for mulching, bagging, or side discharge.
Tip: Empty bag when half full for best performance. Clean underside of deck after each use.
| Maintenance | Frequency | Procedure |
|---|---|---|
| Check engine oil | Before each use | Use dipstick, add SAE 30 if low |
| Clean underside of deck | After each use | Scrape with putty knife (engine off) |
| Check blade sharpness | Every 25 hours | Sharpen or replace if dull |
| Change engine oil | First 5 hours, then every 50 | Drain, refill with 20 oz SAE 30 |
| Replace air filter | Every 25 hours | Clean foam filter, replace if damaged |
| Replace spark plug | Every 100 hours | Use Champion RC12YC gap .030 |
| Lubricate wheels | Every season | Light oil on axle points |
Proper storage extends mower life.
CAUTION! Never store with fuel in tank without stabilizer. Gasoline deteriorates and can damage engine.
Murray 7800369 includes a 2-year limited warranty covering defects in materials and workmanship. Warranty does not cover normal wear, misuse, improper maintenance, or commercial use. Proof of purchase required. For warranty service, contact Murray Customer Service at 1-800-800-7310 or visit www.murray.com. Keep this manual and receipt for warranty claims.
| Symptom | Possible Cause | Corrective Action |
|---|---|---|
| Engine won't start | No fuel, old gas, clogged filter | Add fresh fuel, check fuel valve, clean/replace filter |
| Engine runs poorly | Dirty air filter, old gas | Clean air filter, drain and replace fuel |
| Uneven cutting | Dull blade, low tire pressure | Sharpen/replace blade, check tire pressure |
| Vibration | Bent blade, loose parts | Inspect and replace blade, tighten all bolts |
| Won't drive | Drive cable loose, belt worn | Adjust drive cable, inspect drive belt |
| Bag not filling | Wet grass, deck clogged | Mow when dry, clean underside of deck |
| Engine smokes | Overfilled oil, air filter dirty | Check oil level, clean air filter |
Service: For technical support, call 1-800-800-7310 or visit www.murray.com