Hedge cutter service

 Dewalt DCM563. New 22/11/18

Bit disappointed with this having just serviced it, I see the motor is nearly worn out. It's not brushless like the drills. It's not like I use it every day. I have 300m of hedge I cut twice a year, plus 300m I cut elsewhere. Or around 4 days per year.

The blade is pretty worn too on the back side where it's supposed to be flat.

A new motor assembly - motor not available (brushes not available as the motor is sealed) is £48/60€ They've even gone to the trouble of pressing a plate over the motor mounting screws so you can't even source the motor.

The motor part number is 90626374, and this pops up on a V20 fatmax, for £27/40€

W180430 19.5V S-494 755

Worn brush on the right side just visible. 

The brushes might be swappable.  They are approx 5.5mm x 7mm, with a square locator on the back which is 5.5mm x 4mm.

This seems a good start 

https://www.aliexpress.com/item/4000265047084.html

These are known as RS895/ 875/ 887 motors, although the case size of this motor is the next size down known as a RS755 (in the part no) but the same brushes as a RS750. 755/750 brushes are a lot smaller, reducing the contact with the comm. Important? Don't buy a complete brush assembly because 1. the dewalt one has suppression caps 2. slightly different moulding 3. different arms 4. you can't easily remove brushes from the arms.

See notes + more photos on PC.

New brushes are 4.8mm wide but are too long at 7.2mm from indent. Need to sand them back to about 6mm. Once fitted, the motor takes between 2.2 and 2.8A at 18.5V. I'll need to put some spots of weld to hold the back on. There isn't enough metal to peen.

Soldered some wire to bridge the holes in the brush holders.

A new blade is £87/100€

Why am I quoting in £?  Because despite buying the product in France, no-one stocks them. Poland, Finland, UK. But not France.

A new tool is 118€

Guess this is going binward and I'll be changing brands.

Thanks Dewalt.

1/10/23 Replaced the brushes again. One holder completely missing. Bought complete 895 brush/case assemblies (https://www.aliexpress.com/item/1005005890644120.html), but they are too big (it's a 755 case ie 40mm dia) Brushes are perfect size and can be carefully removed from holder. Cut off a new holder and soldered it onto the old bracket. Ensure it's nicely central on the motor.

Ensure the current is less than 2.5A at 5V before welding. The plate is a bit bent. Will take about 3.3A at 18.5V with the blade attached. Ensure to straighten the blade and WD40.