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Hello
I have a Bosch 1400 Exxcel Washer (WFO2865GB01). After 6 years of use the motor stopped working so I checked the brushes. They were worn out. One was dull in appearance with the copper wire beginning to show. I changed them. After the change the machine does the wash part of the cycle ok but does not spin. It gives up during the ramp up phase. When trying the spin only program the timer starts at 11 but then jumps from 10mins remaining to 1. I then cleaned up the commutator. This resulted in a slightly longer spin but the timer still jumps. Although this time it is from 8 to 1.
I have checked the resistance of the pin pairs (numbered as per the terminal block)
Pins 1 and 2 = 1.3 ohm
Pins 1 and 3 = 1.2 ohm
Pins 2 and 3 = 2.0 ohm
4 and 5 = 3.8 ohm
6 and 7 = 23.8 ohm
Pin 8 no connectionOn this machine there is a wire going to pin 1. In other posts with resistance values there is no mention of pin 1. What is the purpose of this wire? Should pins 1 and 2, 1 and 3 be a circuit or is this a short?
Does this machine use a motor capacitor? If so, where is it located? I cannot see one on the motor.
Any help is much appreciated.
There are various numbers on the motor (listed all as not sure which is the model number).
5500 006818
1BA6765-OEA
K1-F
129.60104.12j
20228A
151.6000.72
B25503777C
129 60102Is it noisy and screechy when it starts to ramp up ? The brushes may need a bit of time to bed in.
Try and put it on an empty drum spin cycle but at a lower spin speed , say 600 to 800 rpm for 5 -7 mins. If that runs ok , leave for a few miniutes then repeat the process but maybe at 900 -1000 rpm . Work your way up to full speed . Sometimes this will get the brushes bedded in better and allow the machine to work correctly.
Unfortunately , if the old brushes had worn down to such an extent that the copper braid had poked through , they may have scored the armature causing poor contact between the new brush faces and the armature. This in turn creates a lot of electrical noise and the main control module doesn’t like this and will consequently abort the spin cycle
Re: Bosch 1400 Exxcel Washer (WFO2865GB01) spin problem
Its not particularly noisy and definitely no screeching. I was trying it on the lowest spin speed 600. The armature is not scored.
Both brushes are fitted the correct way round. Having examined the new brushes after testing I noticed the angle of the bevel on the new brushes is slightly different to that of the old. Also only 1/2 the brush thickness is shiny so it appears the brush does not have a good contact. I will file it to get the same angle and try again.
Also one of the brush holders had a lug that was sticking out. This was preventing the brush moving freely in the holder. I have bent the lug in and will try with that.
The resistance readings in my first post were taken after stripping the motor and cleaning the case, armature, windings etc. There is no evidence of overheating / burning / insulation melting. However, when removing the outer windings square block from the rear case I failed to make note of its orientation (expecting it to fit into the connectors one way only). It can fit in 2 ways.
Connection orientation 1 – Windings block serial number on the same side as the rear case serial numbers. When viewed from the rear with the wiring plug connector pointing up, the windings block serial is on the left.
Pins 1 and 2 = 1.3 ohm
Pins 1 and 3 = 1.2 ohm
Pins 2 and 3 = 2.0 ohmConnection orientation 2 – Windings block serial number on opposite side to rear case serial numbers. When viewed from the rear with the wiring connector pointing up, the windings block serial is on the right.
Pins 1 and 2 no connection
Pins 1 and 3 no connection
Pins 2 and 3 = 1.2 ohmHence my question in my original post if there should be a circuit between pins 1,2 and 1,3. There is a wire that goes to pin 1 on the motor connection so it would seem strange if this was not connected to anything (as per orientation 2). But I seek confirmation before I put the motor back together and test it.
Re: Bosch 1400 Exxcel Washer (WFO2865GB01) spin problem
Pretty sure orientation 1 is correct based on my own observations replacing brushes on a 1400 spin motor today.
When fitting brushes I try and match the angle to the worn brushes using a suitable file or wet n dry etc.
Also you need to make sure they slide easily up and own in the holders most need soem work with the wet n dry for my own liking.
I have also noticed a difference in quality re the aftermarket replacement
The cheap end for say £3 on Ebay tend to be harder to fit easily and also imho tend to be noisy.
I use the laminated brushes especially for the higher spin motors as in your case.Typically I can get 4-5ohms across the laminated and 2-2.5 on the cheaper solid carbons when
confident of good contact and fitted well.Hope this helps
Re: Bosch 1400 Exxcel Washer (WFO2865GB01) spin problem
I found filing / sanding the brushes rather hit and miss. It is difficult to get the correct shape so that the majority of the brush surface is in contact with the commutator. So I cut a strip of wet n dry, poked it into the motor on top of the commutator with the rough side up. Then inserted a brush and pushed / pulled the wet n dry paper across it. This sanded the brush to near enough the perfect shape. I then repeated the process on the other side with the other brush.
After refitting the motor I did an empty load spin and it now does 2 spin cycles of 2 or 3 minutes each. So far so good. I then tried it with a large load of wet washing and it also completed. Yippeeee perseverance is the key! Orientation 1 was correct as the motor didn’t blow up
Thanks for your help.
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