Cordless electric enthusiast, new to forum.

twall

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I believe everything except the engine compartment is the same...
Too bad you are farrrr away ... I would give you them, I'm sure most pf the parts are the same as the gas version...
The Electric 90 uses a 36 volt constant speed motor that belt drives a 3 speed & reverse standard gear box transaxle, rear drive wheels are a 5 bolt hole but bolt to a 3 bolt hub. Clutch and brake peddles look the same, Steering wheel is a 3 spoke wheel.... :smile:KennyV

Too bad indeed...:frown: Looking really closely at them, it is actually closer in design to my R72 - but with bodywork! They are cool indeed.

Says, from what I've found, that they were produced in the early 70's......how long were they made?
 

Paul Schruben

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dead CMM1000 cordless mower

My B&D CMM1000 won't start. The gauge goes full green but the motor does not spin. I think the batteries are good but do not know how to test them. I think they are about half way through their normal life. I doubt if they went dead all of a sudden. It ran fine last week.
If I disconnect and reconnect the battery, it starts once and runs feebly.
I have not had either recall done, do you think that has anything to do with it?
I would hate to have to buy a new mower now, I'm waiting for the Bosch Rotak LI to make it to the States.:smile:
 

KennyV

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Hello Paul & Welcome to the LMF.
Good to see 'Electric' mowers...
That has (2) 12 volt batteries for a total of 24 volts... you nay only have 1 charging, check the voltage with it running... :smile:KennyV
 

Mark Widmer

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The "full green" on the battery gauge -- needle on the F -- indicates both batteries are at 24V. Since the gauge is (supposed to be) connected to the motor, this indicates the motor is getting the full 24 V. However, worn-out batteries may not be able to supply the necessary 12A current, even if they charge up to 24 V.

Out of curiosity, just how many years old are (1) the batteries and (2) the mower?

A bad cable or connection between the main circuit board and motor could also explain the motor not turning even though the battery gauge reading is good. Using a voltmeter directly at the motor, with the mower on, would confirm or rule that out.

Paul, it would be good to confirm that all wires are connected. You might check the 6 wire connections on the main circuit board (the board that has the 3 cables screwed to it.) On the side opposite of where the 3 heavy cables are, there are 6 wires connected with a spade-and-lug type connections, arranged in a row along the bottom edge in the figure below. Feel around behind the circuit board with your fingers, and make sure that all 6 connectors are connected.

MowerCMM1000_5177.jpg


Also, make sure the 3 cables are screwed firmly to the circuit board.
 

Paul Schruben

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dead CMM1000 cordless mower

Mark,

Thanks for the photo and suggestions. I checked the 6 spade-and-lug connectors, they are all tight. And the heavier cables are tight. Nothing looks fried on the circuit boards.
When I turn the mower on, I measure 24v at the brushes. I have BB batteries, two years old, probably 100 hours, but still had plenty of capacity the last time the mower ran 2 weeks ago. The mower just turned 7 years old.
This time when I disconnected and reconnected the battery and tried to start it, the battery gauge still went full green, but no feeble running, not even once.
Does anyone know if Black & Decker will respond to my email or should I call them?
Thanks again for your help.

Paul~
 

Mark Widmer

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Hi Paul,

I would try calling first, I think it's best to talk to a real person if you can.

If the motor gets 24V and doesn't run at all, it's sounding like either a motor problem or the brushes are worn. Maybe check for continuity with an ohmmeter (across the brushes, through the motor) -- with mower OFF. You'll need to disconnect the brake wire first, since that provides a short across the motor and will mask an open circuit in the motor coils or bad brush contact. Just undo the spade-and-lug connection from either end of the brake wire.

Sounds like the battery is fine. They shouldn't fail so quickly, in just a couple of uses. And it sounds like your first battery lasted 5 years so you are not mistreating them.
 

Paul Schruben

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CMM1000 repair

Mark,

Thanks for suggesting worn brushes. The red side was worn to the point where it no longer contacted the commutator. Black and Decker has the brushes on backorder, so I made a copper shim to pad it out until the new brushes arrive.

I'm hoping my CMM1000 lasts until the lithium-battery mowers arrive in the States. The Gardena Powermax 42 A Li and Bosch Rotak 43 LI have 36v 4.5 AHr (162WHr) batteries. The Gardena is available now, the Bosch is currently shipping with a 94 WHr battery. For U.S. tastes, they need about 400 Whr, and 50 cm blades. I was hoping they had brushless induction motors but the Bosch motor says DC.
 

Mark Widmer

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Paul, that's good to know you can still get the brushes. Did you end up calling them, or was the communication online (email, or through website)? When I check the Black and Decker website, they say the brush/wire set is no longer available. I may want to order a set for myself now, in case they really do discontinue them.

I'm surprised the Li-ion models are only 160 W-hrs, that's not going to cut very much grass. I guess that's a design compromise, given the higher price of Li batteries. Perhaps that works over in Europe.
 

Paul Schruben

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CMM1000 repair

Mark,

The email reply from B&D was "take it to the service center." Not helpful. I was also disturbed to see the brushes no longer available in the online parts list. They even zeroed out the part number! But I noticed the CMM1200 motor, brush insert, brush spring, and brush cap, have identical part numbers, so the CMM1200 brushes should fit. I called B&D and asked if it was the same part, they did not know, but I ordered them anyway.

Today I'm noticing that the MM1800 brushes are available now, and cost less than half as much. The motor is different, but the insert, spring, and cap are identical. What is even more strange is that the newest models CM1836 and CM1936 have reverted to the old unavailable brushes. Maybe the parts lists are incorrect. At any rate, if I was ordering today I would probably order 2 of each because shipping costs $10.50.

model type motor brushes insert spring cap
cmm1000 242776-03 not avail 242274-00 242207-00 242253-01
cmm1200 1-2A 242776-03 241648-01 242274-00 242207-00 242253-01
cmm1200 3 90551054 241648-01 242274-00 242207-00 242253-01
mm1800 242480-02 242273-00 242274-00 242207-00 242253-01
cm1836 90548854 241648-01 242274-00 242207-00 240808-01
cm1936 90548259 241648-01 242274-00 242207-00 240808-01

241648-01 $6.04 backordered
Detail

242273-00 #$2.49 available now
Detail

Parts confusion is the pits. Not consumer-friendly. Brushes are a wear part, like brake pads. A business plan that zeros out part numbers as they age makes no sense. If they are trying to encourage us to buy a new mower, we will do so - but probably not a Black and Decker. That Honda-engined Toro is mighty tempting. Hopefully it will be a long time before the brushes disappear, but there is an analogy in the computer world, for instance, no more Apple OSX upgrades for machines over 5 years old.

Paul~
 
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