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© 2010 by Snow Joe, LLC
All rights reserved. Original instructions.

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OPERATOR’S MANUAL

SAVE THESE INSTRUCTIONS

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 in rain.
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 be 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 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 stored indoors in dry, and high or locked-up 
place out of reach of children.

11. Maintain mower with care. 

Keep cutting edge 

sharp and clean for best and safest performance and 
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 rain, or in 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 
MJ420CBAT, 12V, 7Ah 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.

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.

 

c) 

If electrolyte contacts the eyes, flush thoroughly 
and immediately with water. Seek medical 
attention.

A Division of Snow Joe, LLC

Form No. SJ-MJ420C-880E

Model No. MJ420C

Cordless Reel Mower 

Cordless Reel Mower 

Summary of Contents for MJ420C

Page 1: ...arts 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 injur...

Page 2: ...e protection when operating machine 18 See manufacturer s instructions for proper operation and installation of accessories Only use accessories approved by the manufacturer SLOPE OPERATION Slopes are a major factor related to slip and fall accidents which can result in severe injury Operation on all slopes requires extra caution If you feel uneasy on a slope do not mow it 1 Mow across the face of...

Page 3: ... full battery 25 to 90 minutes No load speed 1200 rpm 10 Cutting width 16 inches 40 cm Cutting height 0 75 1 02 1 46 1 69 inches Battery operating voltage 24V DC Charging period for fully discharged battery 16 hours Motor output power 54 W Battery charger output 28 6V 800mA Sound Power Level LWA 94 dB A Sound Pressure Level LPA 70 dB A Vibration 1 0 m s2 Weight 18 3 Kg including battery Dependant ...

Page 4: ...ach one Fig 4 3 Use 4 nuts and 4 long bolts to hold the upper and middle sections in place on the Lower Frame Insert the bolts from the outside and fit the nuts on the inside of the frame Fig 5 4 Once the frame is assembled connect the plug on the handle cable to the socket on the main unit Tighten the screw ring to secure the cable Fig 5 5 Secure the cable to the handle using the 3 cable clips le...

Page 5: ...es 16 hours to charge fully from flat 2 To refit the battery remove the charger lead and lower it into the cavity on the top of the product in the correct orientation If the battery does not fit correctly remove it and check there are no obstructions in the cavity Rotate the top handle to the front of the mower to lock into position Fig 9 To keep the battery in prime condition it is best to charge...

Page 6: ...Battery Level Warning This mower uses sealed Pb lead acid batteries which like all batteries can be damaged if they are over discharged The electronic circuit will warn of low battery level and RED LED will be on this indicates that the battery should be recharged at this point GREEN LED ON Normal operation RED LED ON Battery flat please charge to prevent over discharge damage Blade Adjustment SHA...

Page 7: ...d the mower to release the hooks 2 Lift up and clear of the mower Always empty clippings before storage 3 Replacing the grass collector is the reverse of the removal process Starting Stopping The handle is designed with a safety button to prevent accidental starting 1 Press and hold the safety button A located on the left of the upper handle then squeeze the operation lever B towards the upper han...

Page 8: ... damage from overload allow a few minutes for the mower to cool clear any debris and resume Press the reset button and hold the operation lever up to restart the mower Where should I keep my battery The battery should ideally be stored between 10ºC and 24ºC 50ºF and 75ºF so the best place would be inside your house or garage IMPORTANT Charge battery after each use My lawn is very hard to cut what ...

Page 9: ...r of the machine thoroughly using a soft brush or cloth Do not use water solvents or polish Store the lawn mower in a dry place and oil the blades Do not place other objects on top of the machine For storage in confined spaces the handles can be removed from the mower Disconnect the power cord and flex the lower handles to remove from the frame locating lugs Never Store the Mower With a Flat Batte...

Page 10: ...re not covered by this 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 and augers are not covered under warranty belts and augers wear out and can be purchased at the Snow Joe Center Snow Joe LLC m...

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