Murray 425604 99A Series Lawn Mower Manual

The Murray 425604 99A Series 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, adjustable cutting height (1.5-3.75 inches), single-lever height adjustment, rear-wheel drive, and easy-start system. This manual covers safety, assembly, operation, maintenance, troubleshooting, and specifications to ensure proper and safe use.

1. Features at a Glance 2. Assembly Instructions 3. First-Time Setup & Operation 4. Specifications 5. Controls and Adjustments 6. Cutting & Discharge Options 8. Maintenance Schedule 9. Storage & Winterization 10. Safety Information 11. Warranty & Support 12. Troubleshooting

Features at a Glance

Key components: Briggs & Stratton engine, 21-inch steel deck, rear bagger, mulch plug, side discharge chute, height adjustment lever, drive control bar, recoil starter.

Feature	Description
Engine	Briggs & Stratton 125cc, 4-cycle, OHV engine
Cutting Width	21 inches
Cutting Height	Adjustable from 1.5 to 3.75 inches (6 positions)
Drive System	Self-propelled, rear-wheel drive
Cutting Options	3-in-1: Mulch, Bag, Side Discharge
Deck Material	Powder-coated steel
Starter	Recoil (pull-start)
Wheels	8-inch rear, 7-inch front
Fuel Tank	0.5 gallon capacity
Weight	Approximately 65 lbs

Assembly Instructions

Unpack all parts from box. Verify contents against parts list.

Attach handle: Insert lower handle into deck brackets, secure with provided bolts and wing nuts.
Install upper handle: Connect to lower handle, tighten knobs.
Attach grass bag: Hook bag frame onto rear deck brackets; ensure bag is securely fastened.
Install side discharge chute (if not pre-installed): Snap into opening on right side of deck.
Insert mulch plug (for mulching): Place into rear discharge opening.
Check tire pressure: Inflate to 15 PSI if necessary.
Add engine oil: Use SAE 30 detergent oil (approx. 20 oz). Do not overfill.

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

First-Time Setup & Operation

Before first start, complete assembly and add fuel (unleaded gasoline, 87 octane minimum).

Check oil level: Dipstick should show full.
Add fuel: Fill tank with fresh gasoline. Do not overfill.
Set cutting height: Adjust lever to desired position (middle setting recommended for first use).
Start engine: Set throttle to FAST, pull recoil starter firmly.
Engage drive: Squeeze drive control bar to self-propel; release to stop movement.
Begin mowing: Overlap passes by 2-3 inches for even cut.

CAUTION! Operate only in clear daylight. Keep hands and feet away from rotating blade.

Specifications

Model: Murray 425604 99A Series
Engine: Briggs & Stratton 125cc, 4-cycle
Cutting Width: 21 inches
Cutting Height Range: 1.5" - 3.75" (6 positions)
Deck Material: Steel, powder-coated
Drive: Self-propelled, rear-wheel
Wheels: 8" rear, 7" front
Fuel Capacity: 0.5 gallon
Oil Capacity: 20 oz (SAE 30)
Weight: 65 lbs (approx.)
Warranty: 2-year limited

Controls and Adjustments

Handle Controls: Drive control bar (squeeze to engage), throttle lever (FAST/SLOW/STOP), height adjustment lever.

Height Adjustment: Single lever adjusts all four wheels simultaneously. Move lever to one of six positions.

Drive Speed: Controlled by pressure on drive bar. More pressure = faster.

Engine Controls: Throttle (FAST for cutting, SLOW for idle, STOP to shut off), recoil starter handle, primer bulb (if equipped).

Cutting & Discharge Options

3-in-1 system: Choose mulch, bag, or side discharge.

Mulching: Install mulch plug in rear opening. Cuts clippings finely and returns to lawn.
Bagging: Attach grass bag to rear. Collects clippings for disposal.
Side Discharge: Install side chute. Ejects clippings to right side (for tall/wet grass).

Tip: For best mulching, mow when grass is dry and not too tall. Empty bag frequently.

Maintenance Schedule

Regular maintenance ensures long life and safe operation.

Interval	Task
Before each use	Check oil level, inspect blade for damage, clear deck of debris
Every 25 hours	Change engine oil, check air filter, inspect spark plug
Every season	Sharpen or replace blade, lubricate wheel axles, check drive belt
As needed	Clean underside of deck, replace air filter, check tire pressure

WARNING! Disconnect spark plug wire before performing any maintenance.

Storage & Winterization

At end of season, prepare mower for storage.

Drain fuel: Run engine until tank is empty, or add fuel stabilizer.
Change oil: Replace with fresh SAE 30 oil.
Remove spark plug: Add 1 teaspoon of oil into cylinder, pull starter slowly to coat, reinstall plug.
Clean deck: Scrape off grass and dirt; wash and dry thoroughly.
Store indoors: In dry, covered location. Cover mower if stored outdoors.

CAUTION! Never store with gasoline in tank indoors. Fire hazard.

Safety Information

Read all instructions before operation. Keep manual for reference.

Wear sturdy shoes, eye protection, long pants.
Clear mowing area of stones, sticks, debris.
Do not mow wet grass.
Never allow children to operate.
Disconnect spark plug before servicing.
Do not operate on slopes greater than 15 degrees.
Keep hands and feet away from rotating blade.
Stop engine and wait for blade to stop before crossing gravel drives or roads.

Warranty & Support

Murray 425604 99A Series includes a 2-year limited warranty covering defects in materials/workmanship. Warranty does not cover normal wear, misuse, or lack of maintenance. For warranty service, contact an authorized Murray service center. Keep receipt as proof of purchase.

Customer Support: 1-800-MURRAY-1 (1-800-687-7291) or www.murray.com

Troubleshooting

Symptom	Possible Cause	Corrective Action
Engine won't start	No fuel, old gasoline, clogged air filter, spark plug fault	Add fresh fuel, clean/replace air filter, check spark plug gap/replace.
Engine runs poorly	Dirty air filter, old fuel, water in fuel	Replace air filter, drain fuel tank and refill with fresh gasoline.
Uneven cutting	Dull blade, uneven tire pressure, deck clogged	Sharpen/replace blade, inflate tires evenly, clean deck underside.
Self-propel not working	Drive belt worn/disengaged, control cable loose	Inspect drive belt, adjust/replace cable per manual.
Excessive vibration	Loose blade, bent blade, debris stuck	Tighten blade bolt (59-65 ft-lbs), replace bent blade, clean deck.

For Service: Contact authorized Murray service center. Do not attempt repairs beyond your skill level.