Murray MT100 Lawn Mower Manual

The Murray MT100 is a 100cc 4-stroke push lawn mower featuring a Briggs & Stratton engine, 21-inch steel cutting deck, 3-in-1 mulching/bagging/side-discharge capability, single-lever height adjustment, easy-start system, durable rear-wheel drive, and a 2.1-bushel grass collection bag. 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. Maintenance Schedule 8. Storage & Winterization 9. Safety Information 10. Warranty & Support 11. Troubleshooting

Features at a Glance

Key components: 100cc 4-stroke engine, 21-inch steel deck, rear grass bag, height adjustment lever, drive control bar, recoil starter.

Feature	Description
Engine	100cc Briggs & Stratton 4-stroke, overhead valve
Cutting Width	21 inches
Cutting Deck	3-in-1 (mulch, bag, side discharge)
Height Adjustment	Single lever, 6 positions (1-3 inches)
Drive System	Rear-wheel drive with control bar
Grass Bag Capacity	2.1 bushels
Starter	Recoil with easy-start technology
Wheels	8-inch rear, 7-inch front
Fuel Tank	0.5 gallon capacity
Weight	Approx. 60 lbs

Assembly Instructions

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

Attach handle: Insert lower handle into deck brackets, secure with provided bolts and wing nuts.
Install grass bag: Hook bag onto rear deck brackets; ensure secure fit.
Attach side discharge chute (if needed): Snap into place on right side of deck.
Install mulching plug (if needed): Insert into rear discharge opening.
Check wheels: Ensure all wheels are securely attached and rotate freely.
Add engine oil: Use SAE 30 (approx. 20 oz) as specified in engine manual.
Add fuel: Use fresh unleaded gasoline (87 octane minimum).

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

First-Time Setup

Complete assembly, then prepare for first use.

Check oil level: Use dipstick; add if necessary.
Fuel: Fill tank with fresh unleaded gasoline.
Height adjustment: Set cutting height to highest position for first mow.
Inspect area: Clear lawn of debris, stones, and toys.
Start engine: Pull recoil starter firmly; allow engine to warm up.
Test drive: Engage drive control bar; ensure smooth operation.

CAUTION! Never add fuel while engine is hot or running. Operate outdoors only.

Specifications

Model: Murray MT100
Engine Type: 4-stroke, single cylinder, OHV
Displacement: 100cc
Cutting Width: 21 inches
Cutting Heights: 6 positions, 1 to 3 inches
Deck Material: Powder-coated steel
Drive: Rear-wheel, self-propelled
Fuel Capacity: 0.5 gallon
Oil Capacity: 20 oz (SAE 30)
Warranty: 2-year limited

Controls and Operation

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

Starting Procedure:

Check oil and fuel levels.
Move height lever to desired setting.
Push primer bulb 3 times (cold engine).
Set throttle to FAST position.
Pull recoil starter firmly.

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

Cutting Modes: Bagging (attach bag), Mulching (install plug), Side Discharge (attach chute).

Cutting & Height Adjustment

Single lever adjusts all four wheels simultaneously.

Stop engine and wait for blade to stop.
Move lever to desired position (1-6, lowest to highest).
For best results, never cut more than 1/3 of grass height at once.
Overlap passes by 2 inches for even cutting.
Empty grass bag when ¾ full for optimal performance.

Tip: Cut when grass is dry for cleaner results and to prevent clogging.

Maintenance Schedule

Regular maintenance ensures long life and performance.

Interval	Task
Before each use	Check oil level, inspect blade, clear deck of debris
Every 25 hours	Change engine oil (or annually)
Every season	Replace air filter, spark plug
As needed	Sharpen or replace blade, check tire pressure
Storage	Drain fuel or add stabilizer

Blade Care: Disconnect spark plug before inspecting or removing blade. Balance after sharpening.

Storage & Winterization

Prepare mower for off-season storage.

Clean underside of deck thoroughly.
Drain fuel tank or add fuel stabilizer and run engine 5 minutes.
Change engine oil.
Remove spark plug, add 1 teaspoon oil, pull starter slowly to coat cylinder.
Store in dry, covered area.

CAUTION! Never store with fuel in tank indoors. Keep away from open flames.

Safety Information

Read and follow all safety instructions.

Wear sturdy shoes, eye protection, and long pants.
Keep children and pets away from mowing area.
Never mow wet grass.
Disconnect spark plug before performing any maintenance.
Do not remove safety devices or guards.
Use only as intended; do not modify mower.
Be aware of thrown objects; use discharge chute or bag.

DANGER! Rotating blade can cause severe injury. Always ensure blade has stopped before crossing gravel drives or sidewalks.

Warranty & Support

Murray MT100 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 authorized service center with proof of purchase. For support, visit www.murray.com or call 1-800-800-7310.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Engine won't start	No fuel, old gas, clogged filter	Add fresh fuel; check fuel line; clean/replace air filter.
Poor cutting performance	Dull blade, low engine speed	Sharpen/replace blade; set throttle to FAST.
Uneven cut	Uneven tire pressure, worn blade	Check tire pressure; level deck; balance blade.
Excessive vibration	Bent blade, loose parts	Stop engine; inspect blade and fasteners; replace if bent.
Self-propel not working	Drive cable loose, worn belt	Adjust drive cable tension; inspect drive belt.
Grass bag not filling	Clogged deck, wet grass	Clean underside of deck; mow when grass is dry.

Service: For repairs, use authorized Murray service centers. Always use genuine parts.

Support: 1-800-800-7310; www.murray.com