Greenworks 80V Pro mowers compete directly with gas mowers in power and runtime. Their brushless motors and high-capacity batteries handle demanding lawns. When issues arise, this guide helps diagnose and resolve common problems.

Model Overview
Battery and Power Issues
Motor Problems
Self-Propelled System
Cutting Performance
Maintenance Schedule

Model Overview

Greenworks 80V mower line:

Model	Cut Width	Drive	Battery
GLM801602	21”	Push	4.0Ah
GLM801604	21”	Push	5.0Ah
GLM80320	21”	Self-propelled	4.0Ah
GMS250	25”	Self-propelled	4.0Ah + 2.0Ah

[NEED REAL IMAGE: Greenworks 80V Pro mower model label location]

The 80V platform delivers gas-equivalent power. Batteries interchange across the Greenworks 80V line of tools.

Battery and Power Issues

Mower Won’t Turn On

Check:

Battery fully seated (push until click)
Battery charge level (check LED on battery)
Safety bail engaged before start button
Key inserted (some models)

If battery shows full but no start:

Remove battery, wait 60 seconds, reinstall
Clean contacts with dry cloth
Try another 80V battery if available
Inspect battery compartment for debris

Runtime Shorter Than Expected

Expected runtime (typical conditions):

4.0Ah: 45-60 minutes
5.0Ah: 55-70 minutes

Reduced runtime causes:

Grass height - Tall grass uses more power
Self-propel usage - Drive motor draws significant current
Battery age - Capacity decreases over years
Blade condition - Dull blade increases load

Battery Won’t Hold Charge

Signs of failing battery:

Runtime under 50% of original
Won’t fully charge
Drops from full to empty quickly

Battery lifespan: Typically 3-5 years with proper care. Replacement cost: $199-299.

Charger Issues

Charger troubleshooting:

Verify outlet has power
Check LED status on charger
Clean contacts on battery and charger
Battery too hot/cold - wait for room temp

LED meanings:

Red solid = charging
Green solid = complete
Flashing = fault or temperature issue

Motor Problems

Motor Won’t Engage

Start button pressed, nothing happens:

Safety bail must be engaged
Battery must be charged
Key installed (if required)

Click but no spin:

Check for blade obstruction
Motor controller may have tripped
Wait 30 seconds and try again

Reduced Power

Motor seems weak:

Fully charge battery
Check blade sharpness
Clean deck underside
Lower grass height if cutting too much

Motor Overheats

Thermal protection shuts down motor:

Grass too tall - make multiple passes
Blade dull - sharpen or replace
Mowing too slowly - maintain pace
Hot day - mow in morning or evening

Cool-down time: 10-15 minutes

Unusual Motor Sounds

Normal: Brushless whine under load Concerning: Grinding, rattling, intermittent operation

For concerning sounds:

Inspect blade and deck for debris
Check blade bolt torque
Examine blade for damage
Motor bearing issue possible

Self-Propelled System

Drive Won’t Engage

Self-propelled models (GLM80320, GMS250):

Drive bail must be squeezed
Speed control not at zero
Wheels must be in drive position

If still not working:

Inspect drive belt
Check cable adjustment
Drive motor may have fault

Speed Issues

Inconsistent or wrong speed:

Check speed control position
Clean drive mechanism
Inspect belt for wear
Verify wheel engagement

Drive Noise

Clicking: Often normal during engagement Grinding: Belt wear or debris in drive Squealing: Belt slipping

Cutting Performance

Uneven Cut

Diagnosis:

Verify all wheels at same height
Inspect blade for damage/bending
Check deck level
Consistent speed while mowing

Poor Mulching

Improve mulching:

Sharp blade is essential
Mow dry grass only
Don’t remove more than 1/3 of height
Slow down in thick areas
Clean deck frequently

Deck Clogging

Causes:

Wet grass
Dull blade (tears vs cuts)
Too much grass at once
Deck not cleaned regularly

Solutions:

Wait for dry conditions
Sharpen blade
Raise height, make two passes
Clean deck after every 2-3 uses

Bagging Problems

Bag won’t fill well:

Remove mulch plug
Verify bag installed correctly
Clean discharge chute
Check bag for tears

Maintenance Schedule

After Each Use

Remove debris from deck exterior
Wipe battery contacts
Store battery at room temperature

Weekly

Clean deck underside (tip with battery out)
Inspect blade
Check wheel condition

Monthly

Sharpen blade or assess condition
Check all fasteners
Clean battery compartment
Lubricate any specified points

Annually

Replace blade if worn
Deep clean entire mower
Inspect all components
Test battery capacity

Battery Storage

Store at 30-50% charge for winter
Keep indoors above freezing
Charge every 90 days during storage
Avoid extreme temperatures

Troubleshooting Quick Reference

Mower Stops Randomly

Check battery charge
Wait for thermal cool-down
Inspect for blade obstruction
Verify battery connection

Won’t Self-Propel But Blade Works

Check drive bail engagement
Inspect drive belt
Verify wheel position
Drive motor may be faulty

Cuts Poorly Even With Sharp Blade

Check blade bolt torque
Verify correct blade installed
Inspect deck for damage
Deck may not be level

Common Parts

Part	Description	Cost
Blade (21”)	Standard	$25-35
4.0Ah Battery	80V	$199-249
5.0Ah Battery	80V	$249-299
Rapid Charger	80V	$99-149

Warranty Information

Greenworks Pro warranty:

4 years on tool
2 years on battery

Frequently Asked Questions

How does Greenworks 80V compare to EGO?

Similar power and quality. Greenworks often costs less. EGO has wider retail availability. Both are excellent choices.

Can I use 80V batteries in 60V tools?

No. Greenworks voltage platforms are not interchangeable. 80V, 60V, 40V and 24V are separate systems.

Is 80V overkill for a small lawn?

The 80V system provides longer runtime and more power. Even for small lawns, the extra capability means less strain on the system and longer component life.

How long until battery needs replacement?

Expect 500+ charge cycles. With typical use, 4-6 years before noticeable capacity loss.

Greenworks 80V mowers deliver serious power without gas hassles. Maintain the blade, care for the battery and these mowers provide years of reliable service.

Greenworks 80V Mower Problems | Troubleshooting Guide

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