Nilfisk-Advance SC900-28D Service Manual

Contents

23Service Manual – SC900 20 - Wheel System, TractionMotor BrushesIt is possible to replace the motor brushes without removing the motor from the transaxle, if you wish Thisis a decision you should make before you start, however, because one method requires removing the rightwheel and the other method removes the left wheel Replacing the brushes is a relatively easy task, with theexception being the access to the upper-front brushThis procedure is written from the standpoint of leaving the motor in placeWARNING: To avoid unexpected movement, disconnect the battery connector before servicing themachine.− Never work under the machine without safety stands or blocking to support themachine.− To avoid instability of the lifted machine, block the rear (caster) wheels so that theweight of the machine is not on the caster wheels, which can pivot unexpectedly.1 Drain the recovery tank and disconnect themain battery connector2 Optional, but recommended: Raise the leftside of the machine and remove the leftwheel for easier access to the brush motor3 Unscrew the brush cap (A), and remove thespring-loaded brush• For the upper 2 brush caps, you will needto use a right-angle screw driver If youdon’t have one compact enough for thetask, you can try using a coin in the cap’sslot4 During replacement, fit the brush all theway into the motor and hold the contact (B)with your finger. Then slide the cap (A) infrom the side, replacing your finger with thecap to hold the brush Carefully thread cap to prevent cross threading• Hint: To reduce the likelihood of cross threading, unscrew the cap slightly first before screwing it in.5 Repeat this for all 4 brushesAB A