Murray EMT155420H Lawn Mower Manual

The Murray EMT155420H is a 15.5 HP, 42-inch cutting width, rear-engine riding lawn tractor with a 5-speed manual transmission, electric start, and mulching capability. It features a Briggs & Stratton engine, 3-in-1 discharge system (mulch/bag/side discharge), adjustable cutting height (1.5-4 inches), ergonomic high-back seat, headlights, cup holder, and hour meter. Below are key sections for safety, features, assembly, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Assembly Instructions 3. First-Time Setup 4. Specifications 5. Controls and Operation 6. Cutting & Discharge Systems 7. Maintenance Schedule 8. Storage Guidelines 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: 15.5 HP Briggs & Stratton engine, 42-inch steel cutting deck, 5-speed manual transmission, electric start with key, 3-in-1 discharge system, adjustable seat, headlights, cup holder, hour meter.

Feature	Description
Engine	15.5 HP Briggs & Stratton, single-cylinder, overhead valve
Cutting Width	42 inches
Transmission	5-speed manual, rear-engine design
Starting System	Electric key start with backup recoil
Cutting Height	Adjustable from 1.5 to 4 inches (6 positions)
Discharge System	3-in-1 (mulch, bag, side discharge)
Seat	Ergonomic high-back, adjustable
Fuel Tank	2.5 gallons
Headlights	Integrated for low-light operation
Hour Meter	Tracks engine hours for maintenance

Assembly Instructions

Unpack and inspect all parts. Assembly requires basic tools.

Install steering wheel: Align and secure with provided hardware.
Attach seat: Mount to frame using bolts and washers.
Install cutting deck: Lower deck onto mounting points and secure pins.
Connect battery: For electric start models, connect positive/negative terminals.
Add fluids: Fill engine with SAE 30 oil (check dipstick) and fuel tank with unleaded gasoline.

WARNING! Always disconnect spark plug wire during assembly to prevent accidental starting. Use two people for heavy parts.

First-Time Setup

Before first use, complete pre-operation checks.

Check oil level: Ensure oil is at full mark on dipstick.
Fuel: Fill with fresh unleaded gasoline (87 octane or higher).
Tire pressure: Inflate all tires to 12-15 PSI.
Blade engagement: Test blade engagement lever in a safe area.
Adjust seat: Position for comfortable reach to all controls.

CAUTION! Never add fuel while engine is hot or running. Allow engine to cool completely.

Specifications

Engine: 15.5 HP Briggs & Stratton, 4-cycle, OHV.
Cutting Deck: 42-inch stamped steel, 3-blade system.
Transmission: 5-speed manual (1-5, R).
Cutting Height: 1.5" to 4" (6 positions).
Fuel Capacity: 2.5 gallons.
Oil Capacity: 1.5 quarts (SAE 30).
Dimensions: 68" L x 42" W x 42" H.
Weight: 450 lbs (approx.).
Warranty: 2-year limited residential warranty.

Controls and Operation

Operator's station includes ignition key, throttle/choke, blade engagement, parking brake, gear shift, and cutting height lever.

Starting Procedure: 1. Sit on seat. 2. Set parking brake. 3. Disengage blades. 4. Move throttle to "CHOKE" (cold) or "FAST" (warm). 5. Turn key to "START". 6. Release key to "RUN".

Driving: Release parking brake. Press clutch/brake pedal, select gear (1-5 for forward, R for reverse). Gradually release pedal to move.

Cutting: Engage blades only when moving forward. Adjust speed based on grass conditions.

Cutting & Discharge Systems

3-in-1 system allows mulching, bagging, or side discharge.

Mulching: Install mulch plug and mulch blades. Cuts clippings finely back into lawn.
Bagging: Attach grass bagger to rear chute. For heavy clippings.
Side Discharge: Remove mulch plug; install discharge chute. For wet or tall grass.

Tip: Always stop engine and disconnect spark plug before changing discharge configuration.

Maintenance Schedule

Regular maintenance ensures longevity and performance.

Interval	Task
Before each use	Check oil level, tire pressure, fuel, and for debris
Every 8 hours	Check blade condition and sharpness
Every 25 hours	Change engine oil (first change at 5 hours)
Every 50 hours	Replace air filter; check spark plug
Every 100 hours	Replace spark plug; check drive belt tension
Season end	Drain fuel or add stabilizer; clean deck; store properly

WARNING! Always disconnect spark plug before performing any maintenance.

Storage Guidelines

Proper storage prevents fuel system issues and corrosion.

Drain fuel or add fuel stabilizer and run engine for 5 minutes.
Change oil and replace air filter if due.
Clean underside of deck thoroughly to remove grass and moisture.
Remove battery (if equipped) and store in a cool, dry place.
Store in a dry, covered area, preferably on a level surface.

CAUTION! Gasoline is flammable. Store mower away from open flames or heat sources.

Regulatory Information

This equipment complies with ANSI/OPEI B71.1-2012 safety standards for ride-on lawn mowers. Engine meets EPA Phase 3 emissions standards. Copyright © Murray LLC. For support, visit www.murray.com or contact customer service at 1-800-269-6215. Always read and understand the operator's manual before use.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Engine won't start	No fuel, bad spark plug, clogged air filter	Check fuel level; inspect/replace spark plug; clean/replace air filter.
Engine runs poorly	Old fuel, dirty carburetor	Drain old fuel; add fresh gasoline; clean carburetor jets.
Uneven cutting	Dull blades, uneven tire pressure	Sharpen or balance blades; inflate all tires to equal PSI.
Blades won't engage	Faulty PTO switch, loose belt	Check PTO switch connection; inspect and tighten drive belt.
Excessive vibration	Loose blade, damaged spindle	Tighten blade bolt; inspect spindle for damage and replace if needed.

Reset: For safety interlock issues, ensure you are seated, parking brake is set, and blades are disengaged.

Service: 1-800-269-6215; www.murray.com