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© 2013 by Snow Joe, LLC
All rights reserved. Original instructions.

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SAVE THESE INSTRUCTIONS

OPERATOR’S MANUAL

A Division of Snow Joe

®

, LLC

Form No. SJ-MJ408CRM-880E

20-Inch Cordless Lawn Mower

Model No. MJ408CRM

20-Inch Cordless Lawn Mower 

IMPORTANT!

Safety Instructions

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WARNING: READ ALL 

INSTRUCTIONS BEFORE USE.

Read all instructions when using cordless lawn mowers. Basic 
safety precautions should always be followed to reduce the 
risk of fire, electric shock, and personal injury.

For All Lawn Mowers

1.  Avoid dangerous environment.

 Do not use the mower 

in damp or wet locations.

2.  Don’t use when it’s raining.
3.  Keep children away.

 All bystanders (visitors) should be 

kept at a safe distance from work area.

4.  Dress properly.

 Do not wear loose clothing or jewelry. 

They can get caught in moving parts. Use of rubber 
gloves and substantial footwear is recommended when 
working outdoors. Wear protective hair covering to 
contain long hair.

5.  Use safety glasses.

 Always use face or dust mask if 

operation is dusty.

6.  Use the right mower.

 Do not use mower for any job 

except that for which it is intended.

7.  Don’t force mower.

 It will do the job better and safer 

at the rate for which it was designed.

8.  Don’t overreach.

 Keep proper footing and balance at 

all times.

9.  Stay alert.

 Watch what you are doing. Use common 

sense. Do not operate mower when you are tired.

10. Store idle mowers indoors. 

When not in use, mowers 

should be kept dry and away from children on a high or 
locked-up place.

11. Maintain mower with care. 

Keep cutting edges sharp 

and clean for best and safest performance as well 
as to reduce the risk of injury. Follow instructions for 
lubricating and changing accessories. Keep handles 
dry, clean, and free from oil and grease.

12. Check damaged parts. 

Before further use of the 

mower, a guard or other part that is damaged should 
be carefully checked to determine that it will operate 
properly and perform its intended function. Check for 
alignment of moving parts, binding of moving parts, 
breakage of parts, mounting, and any other condition 
that may affect its operation. A guard or other part that 
is damaged should be properly repaired or replaced 

by an authorized service center unless indicated 
elsewhere in this manual.

13. Keep guards in place and in working condition.
14. Keep blades sharp.
15. Keep hands and feet away from cutting area.
16. Objects struck by the lawn mower blade can cause 

severe injuries to people. 

The lawn should always be 

carefully examined and cleared of all objects prior to 
each mowing.

17. If lawn mower strikes a foreign object, follow these 

steps: 

 

i) 

Stop lawn mower. Remove the safety key.

 

ii)

  Inspect for damage.

 

iii)

  Repair any damage before restarting and operating 

the lawn mower.

18. Use identical replacement blades only.

Safety Instructions For  
Battery-Operated Lawn Mowers

1. 

Do not charge lawn mower in the rain, or in a wet 
location.

2. 

Do not use battery-operated lawn mower in rain.

3. 

Remove or disconnect safety key before servicing, 
cleaning, or removing material from the lawn mower.

4. 

Use only the following type and size battery: type  

SJ-B17AH; SJ-B18AH; SJ-B20AH

, 24V lead acid 

battery.

5. 

Do not dispose of the battery in a fire. The cell may 
explode. Check with local codes for possible special 
disposal instructions.

6. 

Do not dispose of the battery. Released electrolyte is 
corrosive and may cause damaged to the eyes or skin. 
It may be toxic if swallowed. Check with local codes for 
recycling.

7. 

Exercise care in handling batteries in order not to short 
the battery with conducting materials such as rings, 
bracelets, and keys. The battery or conductor may 
overheat and cause burns.

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CAUTION

The electrolyte is dilute sulfuric acid that is harmful to the skin 
and eyes. It is electrically conductive and corrosive.  
The following procedures should be observed:

 

a) 

Wear full eye protection and protective clothing.

 

b)

  If electrolyte contacts the skin, wash it off 

immediately with water.

Summary of Contents for SUNJOE MJ408CRM

Page 1: ...ermine that it will operate properly and perform its intended function Check for alignment of moving parts binding of moving parts breakage of parts mounting and any other condition that may affect its operation A guard or other part that is damaged should be properly repaired or replaced by an authorized service center unless indicated elsewhere in this manual 13 Keep guards in place and in worki...

Page 2: ... by pulling the charger cord Do not service the mower with the charger connected or with the safety key inserted Do not use a damaged charger Replace the charger cords or the charger immediately Keep the mower and the charger away from water heat sources radiators heaters stoves etc flames and chemicals Do not dispose of this product in fire batteries inside this product may explode or leak IMPORT...

Page 3: ...achine 4 Use extra care when approaching blind corners shrubs trees or other objects that may block your view of a child SERVICE GENERAL SERVICE 1 Keep all nuts and bolts tightly fastened 2 Never tamper with safety devices Regularly check to ensure they are in place and working properly 3 Keep the mower free from grass leaves or other debris buildup 4 If you strike a foreign object stop and inspec...

Page 4: ...fully before operating the mower Compare the illustration below to the mower in order to become familiar yourself with the location of the various controls and adjustments Save this manual for future reference 1 Switch 2 Safety Key 3 Hand Grip 4 Power Button 5 Upper Handle 6 Lower Handle 7 Handle Knob 8 Battery 9 Motor Housing 10 Grass Catcher Bag 11 Grass Catcher Hook 12 Battery Plug 13 Chute Cov...

Page 5: ...ng the Grass Catcher Bag Fig 3 1 UNPLUG THE POWER CORD AND WAIT FOR BLADE TO COME TO A COMPLETE STOP 2 Lift the chute cover 3 While holding up the cover place the grass catcher bag hanger hooks into the opening on the chute cover to allow the hanger hooks to attach to the rod which secures the chute cover NOTE For optimal performance empty grass bag often during use A full grass bag will inhibit p...

Page 6: ...control lever Hold the switch control lever for operation 2 To stop the lawn mower release the switch control lever 3 If your lawn mower is not going to be used for a while pull out the safety key The machine will not operate without the safety key inserted m CAUTION Do not attempt to override the operation of the safety key or lever m WARNING The operation of any mower can result in foreign objec...

Page 7: ...green light will light up when the battery is fully charged 1 Plug the charger connector into the jack on the battery 2 Insert the 120 V plug from the charger into the electrical outlet 3 The red light on the charger should come on which indicates that the charger is working and the battery is being charged The red light will go out and the green light will come on when the battery is completely c...

Page 8: ... THROWN BY THE ROTATING BLADE 1 Release the switch to turn the mower OFF when crossing any graveled area stones can be thrown by the blade 2 Set mower to the highest cutting height when mowing on uneven ground or in tall weeds 3 For effective mulching do not cut wet grass be cause it tends to stick to the underside of the deck preventing proper mulching of grass clippings New or thick grass may re...

Page 9: ... cover do not use water Wipe the mower clean with a dry cloth occasionally If debris build up on the underside of the unit while using stop the motor and disconnect it from the power supply Tilt the mower forward or on its side and scrape it clean with an appropriate tool Storage The following steps should be taken to prepare the lawn mower for storage Make certain the power cord is disconnected C...

Page 10: ...prevent accidental start ups remove the safety key when the mower is not in use Remove the battery when making any adjustments or when any of the four wheels must be lifted off the ground 3 Keep the handles dry clean and free of oil and grease 4 In order to reduce the risk of fire keep the motor free of grass leaves and debris build up 5 Frequently check the blade and motor mounting bolts for prop...

Page 11: ...NOTES 11 ...

Page 12: ...s warranty Parts used that are not genuine Snow Joe parts are not covered by this warranty Damages resulting from misuse alteration improper assembly improper adjustment neglect or accident which requires repair is not covered under this warranty Belts augers and tines are not covered under warranty belts augers and tines wear out and can be purchased at www snowjoe com or by calling 1 866 766 956...

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