Murray 425615x50A Lawn Mower Manual

The Murray 425615x50A is a 21-inch push lawn mower featuring a Briggs & Stratton 125cc engine, 3-in-1 mulching/bagging/side discharge capability, 6-position single-lever height adjustment, durable steel deck, easy-start system, and rear-wheel drive. This manual covers safety, assembly, operation, maintenance, troubleshooting, and specifications. Always read and follow all safety instructions before use.

1. Features at a Glance 2. Assembly Instructions 3. Safety Precautions 4. Specifications 5. Controls and Operation 6. Cutting Height Adjustment 7. Maintenance Schedule 8. Engine Care 9. Storage Instructions 10. Warranty Information 11. Troubleshooting

Features at a Glance

Key components: Briggs & Stratton 125cc engine, 21-inch steel cutting deck, rear bagger, mulch plug, side discharge chute, single-lever height adjustment, rear-wheel drive system, and easy-start primer bulb.

Feature	Description
Engine	Briggs & Stratton 125cc, 4-cycle
Cutting Width	21 inches
Cutting Options	3-in-1 (Mulch, Bag, Side Discharge)
Height Adjustment	Single-lever, 6 positions (1-3 inches)
Drive System	Rear-wheel drive
Deck Material	Durable steel
Fuel Tank Capacity	0.5 gallons
Starter Type	Recoil with primer bulb
Wheel Size	8-inch rear, 7-inch front
Weight	Approximately 55 lbs

Assembly Instructions

Unpack all parts and inspect for damage. Assembly requires basic tools (included).

Attach handle: Insert lower handle into deck brackets, secure with bolts and wing nuts.
Install upper handle: Connect to lower handle, tighten knobs.
Attach grass bag: Slide bag frame onto rear deck hooks; ensure secure fit.
Install side discharge chute: Attach to deck opening with provided pin.
Insert mulch plug: Place into rear discharge opening for mulching mode.
Check wheels: Ensure all wheels are securely attached and rotate freely.
Add oil and fuel: Refer to engine manual for proper type and quantity.

WARNING! Always wear gloves during assembly. Ensure all fasteners are tight before operation.

Safety Precautions

Read all instructions before operating. Failure to follow safety rules may result in serious injury.

Clear mowing area of stones, toys, and other objects that could be thrown.
Always wear sturdy footwear and eye protection.
Do not mow wet grass or in rainy conditions.
Never allow children or pets near mower during operation.
Disconnect spark plug wire before performing any maintenance.
Do not put hands or feet near rotating blades or under deck.
Use extreme caution when mowing on slopes; mow across slopes, not up and down.
Never leave mower unattended with engine running.

DANGER! Rotating blades can cause severe injury. Keep clear at all times.

Specifications

Model: Murray 425615x50A
Engine: Briggs & Stratton 125cc, 4-cycle
Cutting Width: 21 inches
Cutting Height Range: 1 to 3 inches (6 positions)
Deck Material: 20-gauge steel
Drive Type: Rear-wheel drive
Wheels: 8-inch rear, 7-inch front
Fuel Type: Unleaded gasoline (87 octane minimum)
Oil Type: SAE 30 (above 40°F) or 10W-30 (all temperatures)
Weight: 55 lbs (approx.)
Warranty: 2-year limited

Controls and Operation

Handle Controls: Drive control bar, height adjustment lever, primer bulb, recoil starter.

Starting Procedure:

Check oil level; add if necessary.
Fill fuel tank with fresh unleaded gasoline.
Push primer bulb 3 times (cold engine).
Set throttle to FAST position.
Pull recoil starter firmly until engine starts.

Operation: Squeeze drive control bar to engage self-propulsion. Release to stop drive. To stop engine, release drive control and move throttle to STOP position.

Cutting Height Adjustment

Single-lever adjustment for all four wheels simultaneously.

Stop engine and wait for blades to stop completely.
Pull height adjustment lever toward wheel.
Move lever to desired position (1-6, with 1 being lowest).
Release lever to lock in position.
Test mower on flat surface to ensure even cut.

Tip: For first mow of season, set to highest position. Never remove more than 1/3 of grass blade length at one time.

Maintenance Schedule

Frequency	Task
Before each use	Check oil level, inspect blades, clear deck of debris
Every 8 hours	Check wheel bolts and handle fasteners
Every 25 hours	Change oil (first change after 5 hours)
Every season	Replace air filter, spark plug
As needed	Sharpen or replace blade, clean under deck
End of season	Drain fuel or add stabilizer, clean thoroughly

Engine Care

Briggs & Stratton 125cc engine maintenance guidelines:

Oil Change: Run engine 2-3 minutes to warm oil. Drain completely via drain plug. Refill with 20 oz SAE 30 or 10W-30.
Air Filter: Remove cover, clean foam pre-cleaner in soapy water. Replace paper element if dirty.
Spark Plug: Gap at 0.030 inches. Replace annually.
Fuel System: Use fresh gasoline (less than 30 days old). Add fuel stabilizer for storage.
Carburetor: Adjust only if engine runs poorly; refer to engine manual.

CAUTION! Engine is hot after operation. Allow to cool before maintenance.

Storage Instructions

Proper storage extends mower life and ensures easy starting next season.

Drain fuel tank or add fuel stabilizer and run engine 5 minutes.
Change oil while engine is warm.
Remove spark plug, add 1 tablespoon of oil to cylinder, pull starter slowly to distribute.
Clean entire mower, especially under deck.
Sharpen blade or replace if damaged.
Store in dry, covered area away from moisture.
Cover mower to prevent dust accumulation.

WARNING! Gasoline is flammable. Store in approved container away from heat sources.

Warranty Information

Murray 425615x50A 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 authorized Murray service center or call 1-800-800-7310. Keep this manual and receipt for warranty claims.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Engine won't start	No fuel, old gas, clogged filter	Check fuel level; use fresh gas; clean/replace air filter.
Engine runs poorly	Dirty air filter, old spark plug	Clean air filter; replace spark plug; check fuel.
Uneven cutting	Dull blade, uneven tire pressure	Sharpen or replace blade; check tire pressure.
Mower vibrates excessively	Damaged or unbalanced blade	Stop engine immediately; inspect and replace blade.
Self-propel not working	Drive belt loose or broken	Check drive belt tension; replace if worn.
Grass not discharging	Wet grass, clogged deck	Wait for grass to dry; clean under deck.
Wheels not turning freely	Debris in axles	Clean wheel axles; lubricate if necessary.

Service: For technical support, call 1-800-800-7310 or visit www.murray.com