Black & Decker 19" Electric Lawnhog Mulching Mower with Rear Bag - Answered Questions & Fixed issues
How to replace battery in MODEL # CM1836 lawn mower
Searched and searched for this, finally found someone's description on an amazon review of the replacement battery. Reprinted below. Worked for me!1. First use compressed air to blow out the six screw holes that secure the cover to the chassis. If, like me, you don't have a compressor, just tip the mower over so gravity will allow the dead grass and chaff that fills up the screw wells over time to fall out as you dislodge the stuff with a screw driver or a stick.2. After the debris is removed, use a T20 Torx driver to loosen the screws. There is a slot in the cover screws that allow the use of a blade screwdriver, but you'll need the T20 driver to remove the battery anyway. The screws need not be removed from the screw wells in the cover, but they have to disengage from the chassis.3. The cover should easily lift away from the chassis once the screws are loose. Expect to find a lot of grass clippings and cobwebs on the motor housing and the rest of the chassis that could benefit from some cleaning while you've got the cover off.4. As mentioned before, a T20 driver will be required to remove the two screws securing the battery bracket. No slots in these screws. Make note of the positive and negative terminals of the old battery so you can make the same connections to the new one.5. My replacement battery was smaller (not as tall) as the original. I made a shim out of some old cardboard to allow the bracket to be sufficiently tight. Without the shim, the bracket screws were too long. A piece of 1x wood might work as well, but I liked the give in the cardboard to get a snug fit with the bracket.6. Replace the cover, tighten the screws, and you should be good to go.
How do I remove the
i uses impact gun with 3/4 " socket.run it in reverse or you have to remove the stationary parts of the motor.mark them so u will know how to put them back together & somebody has to hold the armature will u r turning the nut on the blade.
CM1936
I have the same issue on one used twice, did you figure yours out?
Shaft turns while trying to remove blade on B&D MM875 elec. mower
Here's the scoop on the MM875: it has a plastic piece called a "blade insulator" (part # 241381-01) that "locks" the shaft to the blade, so that you can remove the nut by stopping or blocking the blade. If it has been damaged or stripped out, then stopping the blade won't do anything. However, the metal spacer directly under the nut IS still locked to the shaft (because of its shape), so you can use a pipe wrench or something to hold that in place and unscrew the nut. You might even be able to get someone in a home improvement store to do this for you. But you will still need to replace the insulator, which is only a few dollars.
If the rectifier is defective would it chip tht circuit bbaker to the power source
Yes almost certainly if it (the rectifier) has gone short circuit, but you should be able to test the rectifier with a test meter; disconnect mains and rectifier, forward and reverse resistance should be low and very high for each diode leg in each direction of test leads (4 diodes if it has 4 wires)
test each leg both ways, or get testmeter with diode test
Need to replace flap on cmm1200
1. Push the mower down to its lowest mowing position.2. Turn it up on its right side, so the left side is in the air.3. The existing flap is held in place with a glob of glue at the left (now top) end. Remove the glue by whatever means you like. I "chiseled" at it with taps from a flap-blade screwdriver and hammer.4. Now you can slide the remnants of the old flap out and slide the new one in. You'll have to bend it slightly even with the mower in its lowest position to get it past the wheel, but it shouldn't be close to breaking.5. Replace the glob of glue with whatever you have handy that plays well with plastic and rubber. By coincidence I already had DAP Alex Ultra 230 Black loaded in my caulk gun - worked fine.
Black and Decker Electric Lawn Mower MM850 wiring diagram
I have repaired mines. It was found in the trash dump, just before street curb side trash collection. It is a very sophisticated lawn mower. It taken me a month to restore it. The problem is the housing is poor design and does not hold the pin switch securely. This is not a simple on/off switch. It is switch module with two momentary switches built in to it to work simultaneously. The hot is a normally open momentary switch and the neutral is a normally closed momentary switch. Two things must occurred simultaneously for the lawn mower to work. The AC hot has to close and the neutral to open. This is a split phase AC motor. The switch has four connectors to it. The first two has black wires to it, for the hot, that is normally open. The second two has a white wire and red wire to it for the motor's start up winding. The orange connects with the plug's white, neutral. A new substitute switch will be two individual momentary switch, one for the two black wires will be normally open and the two for the red and white wires from the motor start coil will be normally close. It will take two fingers to operate the lawn mower. I recommend you to buy a new and each switch from Black and Decker.
The problem with the system is not the switch, but the poorly designed switch box housing. Often, there is nothing wrong with the switch. I tested mines and it works fine. The problem is the switch box housing does not keep the switch in the correct position for the higher tension spring lever to press against it to operate. I use small washers to stack between the rear of the switch inside and reassembled the switch box upside down by turning the handle upside down, so the washers and switch do not fall out. Once I am finished assembling the switch box and position it on the handle, then I position the handle back to the normal top side and attach the handle back to the lawn mower. I am finished.
http://en.wikipedia.org/wiki/AC_motor#Split-phase_induction_motor
"Split Phase Motors
Split phase ac motors are widely used for low power applications as for example in oil burners, furnace blowers, garage door openers and major appliances. Such motors employ separate run and start windings connected in parallel across the acpower source. When the motor is initially energized both windings are energized, and when the rotor speed reaches about eighty-five percent of the normal running speed the start winding is disconnected from the circuit. Various devices are utilized forthis latter purpose and include centrifugal switches and current and voltage relays.
A problem which is characteristic of these motors is that they have a relatively short operating life. The principal reason for this is the failure of the switching devices used to cut out the start windings when the rotors approach the normalrunning speeds.Failure of these switching devices in turn cause the start windings to burn out.
One of the reasons for the failure of these switching devices is the high currents which they are carrying at the time the contacts open. Attempts to increase contact life by use of improved designs and materials have not been altogethersuccessful. Another disadvantage associated with these switching devices is that they are necessarily quite large and occupy a substantial space in the motor housing." -from another web site.
CM1000 quality cordless mower?
I have owned a cm1000 for about 10 years and have been very pleased with it. I received a replacement charging circuit board as a recall item but other than that no problems. I can usually mow my front and back yards about twice on a charge. I think I will replace the batteries this year for the first time because they are not performing well.
Wont start has never worked
it does click thats a good sign it sounds to me its a power problem battery not holding charge ? can it be wired if so plug it in and start it if it doesnt start its a motor problem if it does start its a a battery problem
How to tighten blade
if the blade is unbalanced it will not stay tight and should be replaced then with a block of wood to hold the blade from turning tighten the replacement blade
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