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The brake on your mitersaw is an electric brake. When you release the power switch, the switch sends current to a brake coil in the motor's field. This reverses polarity to the motor and stops the armature from spinning. Good contact from the motor brushes is also important for this to work correctly.
probably not--This sounds like uneven pressure from the hydraulic pump or problems with the drive motors. Check that the hydraulic oil filter is in good condition (not blocked) and have the pressure in the hydraulics checked.. Have the hydraulic controls checked for correct operation. (if electric controls check for voltage problems to the solenoids and if manual check for control valve problems)
Disconnect the power
lay machine on it's left side
remove back cover screw and cover
slip belt off pully
unplug motor wires
undo bolts holding motor
pull motor to rear of machine
revome motor to bench
locate brush housings
undo retaining clip and slide out old brush
fit new brush
replete with other brush
reasonable in reverse of removal
You may want to check some things out before actually replacing the starter.
Check the fuse in the fuse box and the relay.
There are two parts to the starter. One is the actual starter motor and the other in the starter solenoid. The solenoid moves the starter motor into place and engages it into the engine.
When you turn the key you should hear the solenoid click as it moves the starter. If you hear the click and the sound of the stater motor spinning it is just the solenoid. It can be replaced without replacing the starter motor.
If you hear the click and no sound of the starter motor trying to turn. It is the starter motor.
It check for power at the motor. Use a test light or voltage meter to see it is getting power when the key is turned.
If you are getting power you have a problem with the starter motor as you suspect already. The above may save you money.
To change the motor it is fairly simple to do. You remove the four bolts holding the motor in place, remove the electrical connections. Slide the motor out. Installation is the reverse of removal.
I am assuming you know where the starter is. On a diesel it is on the back of the engine. On a gas engine it is on the front side.
If you really want to get into it you can replace the brushes on the starter motor. Once out you open the starter and install new brushes it they appear warn and are not making contact.
If you need details I would go to the library and ask for the Bentley service manual. They will have one or can get one from another branch.
On the Boxer motor, the starter is located at the back of the engine, usually a Denso or Fuji Heavy Industries own, and is held on with 2 13mm bolts. There is a 12mm nut on the main cable from the battery.
Remove the battery leads, negative (black) first, then the positive (red) lead and store the ends away from the terminals while you work.
Undo the 2 bolts holding the starter onto the bellhousing, and ease it backwards. Undo the 12mm nut securing the battery cable and put the nut back on the post, its brass and you should retain it as a steel one will strip the copper thread on the post.
Pull the single plug out of the back of the solenoid on the motor - that is the "start" wire from the ignition.
Swivel the end of the motor toward the rhs and it will come out sideways and upwards.
Refitting is the exact reverse of the above. The problem will be the carbon brushes in the starter motor, it can be easily repaired at an auto electrical shop instead of a new one. The solenoid slide bolt can be cleaned and lubed too, but brush replacement is not a home diy job, the solder joints need a LOT of heat to fit new brushes.