Murray 866084-00 Lawn Mower Manual

The Murray 866084-00 is a walk-behind, self-propelled lawn mower featuring a Briggs & Stratton engine, 21-inch steel cutting deck, 3-in-1 mulching/bagging/side-discharge capability, single-lever height adjustment, rear-wheel drive, and a 2-gallon grass bag. Below are key sections for safety, features, assembly, operation, maintenance, troubleshooting, and specifications.

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

Features at a Glance

Key components: Briggs & Stratton engine, 21-inch steel deck, rear-wheel drive system, single-lever height adjustment, 3-in-1 function selector, 2-gallon grass bag, and foldable handle.

Feature	Description
Engine	Briggs & Stratton 140cc OHV engine
Cutting Width	21 inches
Cutting Deck	Steel construction with reinforced edges
Drive System	Rear-wheel self-propelled with variable speed control
Height Adjustment	Single-lever, 6 positions (1.5" to 3.75")
Grass Collection	2-gallon fabric bag with easy-empty feature
3-in-1 Function	Mulch, Bag, or Side Discharge capability
Handle	Foldable for compact storage
Wheels	8-inch rear, 7-inch front
Starter	Recoil pull-start system

Assembly Instructions

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

Attach handle: Secure upper and lower handle sections with provided bolts and wing nuts.
Install grass bag: Attach bag support brackets to deck, then hook bag onto brackets.
Connect drive cable: Route cable from handle to transmission and secure with clip.
Install side discharge chute: Attach to deck opening if using side discharge mode.
Add engine oil: Fill with SAE 30 detergent oil (check dipstick for proper level).
Add gasoline: Use fresh unleaded gasoline (87 octane minimum).

WARNING! Keep hands and feet clear of cutting blade during assembly. Ensure all bolts are tightened securely.

Safety Information

Read all instructions before operation. Always wear appropriate safety gear.

Clear mowing area: Remove stones, toys, and other objects that could be thrown.
Check fuel: Fill outdoors, away from ignition sources. Wipe spills immediately.
Inspect mower: Check for loose parts, damaged blade, or leaks before starting.
Start safely: Stand behind mower, engage drive lever, then pull starter cord.
Operate carefully: Do not mow on steep slopes. Push, don't pull, when turning.
Stop engine: Release drive lever and wait for blade to stop before crossing paths or adjusting.

DANGER! Never insert hands or feet under deck while engine is running. Keep children and pets away from mowing area.

Specifications

Model: Murray 866084-00
Engine: Briggs & Stratton 140cc OHV, 4-cycle
Cutting Width: 21 inches
Cutting Height: 6 positions, 1.5" to 3.75"
Drive: Rear-wheel self-propelled, variable speed
Deck Material: 20-gauge steel
Grass Bag Capacity: 2 gallons
Wheels: 8-inch rear, 7-inch front
Weight: 65 lbs (assembled)
Fuel Capacity: 0.5 gallons
Oil Capacity: 20 oz (SAE 30)

Controls and Operation

Handle Controls: Drive engagement lever, speed control, height adjustment lever.

Starting Procedure:

Check oil and fuel levels.
Move to clear, flat area.
Set height adjustment lever to desired position.
Set 3-in-1 selector to desired function (mulch, bag, or side discharge).
Pull choke (if engine is cold).
Stand behind mower, squeeze drive lever to handle, and pull starter cord firmly.
Release choke once engine starts smoothly.

Stopping: Release drive lever, move throttle to STOP position, wait for blade to stop completely.

Cutting Height Adjustment

Single-lever adjustment controls all four wheels simultaneously.

Stop engine and wait for blade to stop.
Pull height adjustment lever outward and move to desired position (1-6).
Release lever to lock into position.
Test on small area before full mowing.

Tip: For first mow of season, set to highest position. Gradually lower for subsequent mows.

3-in-1 Function Setup

Configure mower for mulching, bagging, or side discharge.

Mulching: Install mulch plug (included). Grass is cut finely and returned to lawn as fertilizer.
Bagging: Attach grass bag to rear brackets. Empty bag when 2/3 full for best performance.
Side Discharge: Install side discharge chute. Use for cutting tall or wet grass.

WARNING! Always stop engine before changing function. Ensure all attachments are securely installed.

Maintenance Schedule

Maintenance Task	Frequency	Procedure
Check engine oil level	Before each use	Use dipstick; add SAE 30 if low
Clean underside of deck	After each use	Turn mower on side (spark plug up); scrape with brush
Check blade sharpness	Every 25 hours	Inspect for nicks; sharpen or replace as needed
Replace air filter	Every season	Remove cover; replace foam filter
Change engine oil	Every season or 50 hours	Drain old oil; refill with 20 oz SAE 30
Replace spark plug	Every 100 hours	Use Champion RC12YC gap .030"

Storage Guidelines

Prepare mower for off-season storage to prevent damage.

Clean thoroughly: Remove all grass clippings from deck, wheels, and engine.
Fuel treatment: Add fuel stabilizer to tank, run engine 5 minutes, then turn fuel valve OFF and run until engine stops.
Oil change: Drain and replace oil if not done recently.
Remove spark plug: Add 1 tablespoon of oil to cylinder, pull starter cord slowly, then reinstall plug.
Store properly: Keep in dry, covered area. Fold handle for compact storage.

CAUTION! Never store mower with fuel in tank for more than 30 days without stabilizer.

Warranty Information

Murray 866084-00 comes with a 2-year limited warranty covering defects in materials and workmanship. Warranty does not cover normal wear, improper maintenance, or commercial use. Proof of purchase required. For warranty service, contact Murray customer service at 1-800-269-6215 or visit www.murray.com. Keep this manual and purchase receipt for warranty claims.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Engine won't start	No fuel, stale fuel, clogged air filter	Add fresh gasoline; clean/replace air filter; check spark plug.
Engine runs poorly	Dirty air filter, old gasoline	Replace air filter; drain and refill with fresh fuel.
Uneven cutting	Dull blade, uneven tire pressure	Sharpen or replace blade; check tire pressure (20 PSI).
Mower doesn't self-propel	Drive cable loose or broken	Adjust drive cable tension; replace if broken.
Excessive vibration	Loose blade, bent blade shaft	Tighten blade bolt; inspect for damage.
Grass bag not filling	Clogged deck, wet grass	Clean underside of deck; mow when grass is dry.

Service: For technical support, call 1-800-269-6215 or visit www.murray.com