Murray MYT4213500 Lawn Mower Manual

The Murray MYT4213500 is a 21-inch 3-in-1 push lawn mower featuring a 150cc Briggs & Stratton engine, rear bagging, side discharge, and mulching capabilities. It includes a single-lever height adjustment (6 positions: 1.25"-3.75"), durable steel deck, easy-start system, and large 10-inch rear wheels for maneuverability. 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 Height Adjustment 7. Bagging, Discharging & Mulching 8. Safety Features 9. Maintenance & Storage 10. Warranty Information 11. Troubleshooting

Features at a Glance

Key components: 21-inch steel cutting deck, Briggs & Stratton 150cc engine, Rear grass catcher, Single-lever height adjustment, 10-inch rear wheels, 3-in-1 functionality.

Feature	Description
Cutting Width	21 inches
Engine	Briggs & Stratton 150cc, 4-cycle
Cutting Options	Rear bagging, Side discharge, Mulching
Height Adjustment	Single lever, 6 positions (1.25" to 3.75")
Wheels	10-inch rear, 8-inch front
Deck Material	Durable steel
Starter	Recoil easy-start system
Fuel Tank	0.5 gallon capacity
Handle	Foldable for storage
Safety Key	Engine stop feature

Assembly Instructions

Unpack and inspect all parts. Assemble on a flat, clear surface.

Attach handle: Align lower handle with deck brackets, secure with provided bolts and wrench.
Install wheels: Slide axle through deck brackets, attach wheels with washers and retaining clips.
Attach grass catcher: Hook bag frame onto rear deck brackets; ensure bag is properly seated.
Install side discharge chute (if using): Attach to side port with provided wing nut.
Add engine oil: Fill with SAE 30 oil to level indicated on dipstick (approx. 20 oz).
Add fuel: Use fresh unleaded gasoline (87 octane minimum).

WARNING! Wear gloves during assembly. Ensure all bolts are tightened securely before operation.

First-Time Setup

Before first use, complete final checks and adjustments.

Check oil level: Ensure oil is at full mark on dipstick.
Check tire pressure: Inflate to 15 PSI (recommended).
Adjust handle height: Loosen knobs, set to comfortable position, retighten.
Test safety features: Verify engine stop lever and safety key function.
Select cutting mode: Install bagger, side chute, or mulching plug as desired.
Set cutting height: Use single lever to select appropriate height for your lawn.

CAUTION! Never operate without proper oil level. Keep hands and feet clear of moving parts.

Specifications

Model: MYT4213500
Cutting Width: 21 inches
Engine: Briggs & Stratton 150cc, 4-cycle
Cutting Height Range: 1.25" - 3.75" (6 positions)
Deck Material: Powder-coated steel
Wheels: 10-inch rear, 8-inch front
Fuel Capacity: 0.5 gallon
Oil Type: SAE 30 (20 oz capacity)
Weight: 65 lbs (approx.)
Warranty: 2-year limited

Controls and Operation

Main controls: Engine stop lever, Recoil starter, Height adjustment lever, Handle.

Starting Procedure:

Insert safety key.
Push primer bulb 3 times (cold engine).
Set throttle to FAST position.
Pull recoil starter firmly.
To stop: Release engine stop lever.

Operating Tips: Mow when grass is dry. Overlap passes by 2-3 inches. Change mowing pattern weekly. Never remove safety devices.

Cutting Height Adjustment

Single-lever system adjusts all four wheels simultaneously.

Stop engine and wait for blade to completely stop.
Pull height adjustment lever toward wheel.
Move lever to desired position (1-6, with 1 being lowest).
Release lever to lock in position.
Recommended heights: 2.5"-3" for normal turf, 3.75" during hot/dry conditions.

Tip: Always adjust height on level surface. Never adjust while engine is running.

Bagging, Discharging & Mulching

3-in-1 system allows multiple cutting options.

Bagging: Install grass catcher on rear brackets. Empty bag when ¾ full.
Side Discharge: Attach discharge chute to side port. Direct clippings away from people and property.
Mulching: Install mulching plug (blocks discharge port). Mow frequently, cutting no more than ⅓ of grass height.

WARNING! Always stop engine before changing cutting mode. Ensure attachments are securely fastened.

Safety Features

Engine stop lever: Releases to stop engine immediately. Safety key: Must be inserted to start. Blade control: Meets ANSI safety standards. Protective deck: Shields blade during operation.

Maintenance & Storage

Regular maintenance ensures optimal performance and longevity.

After Each Use: Clean underside of deck. Check for loose parts.

Monthly: Check blade sharpness and balance. Sharpen or replace as needed.

Seasonal: Change oil (first 5 hours, then every 50 hours). Replace air filter. Check spark plug.

Storage: Drain fuel or add stabilizer. Clean thoroughly. Store in dry, covered area.

CAUTION! Disconnect spark plug wire before performing any maintenance. Never store with fuel in tank for extended periods.

Warranty Information

Murray MYT4213500 includes a 2-year limited warranty covering defects in materials and workmanship. Warranty does not cover normal wear, misuse, or lack of maintenance. For warranty service, contact Murray Customer Support at 1-800-800-7310 or visit www.murray.com. Keep your receipt as proof of purchase.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Engine won't start	No fuel, old gas, safety key missing	Add fresh fuel, insert safety key, check spark plug.
Engine runs poorly	Dirty air filter, old fuel	Clean/replace air filter, drain and refill with fresh gas.
Uneven cutting	Dull blade, uneven tire pressure	Sharpen or replace blade, inflate tires evenly.
Excessive vibration	Loose blade, damaged blade	Tighten blade bolt (58-70 ft-lbs), replace if bent.
Bag not filling	Wet grass, deck clogged	Mow when grass is dry, clean underside of deck.
Wheels not turning	Debris in axle, damaged bearings	Clean axle area, contact service center.

Service: For repairs not covered in manual, contact authorized service center: 1-800-800-7310

Parts: Genuine Murray parts available at www.murrayparts.com