Nilfisk-Advance SW900, Service Manual

Page: 63 / 137

Electrical and Control System 63 Service Manual – SW900
Disassembly
1 Drive the machine on a level floor and ensure
that it cannot move
2 Turn the ignition key to “0”
3 Remove the hopper by using its transport handle
and wheels
4 Disengage the front fastener and open the
battery compartment hood
5 Disconnect the battery connector
6 Remove the batteries and their container (see
the procedure in the relevant paragraph)
7 Remove the screws (A) and the right side panel
(B) from the machine; then remove also the left
side panel
8 On the main motor, release the fastener (C) and
remove the protection band (D) of the carbon
brushes
9 Remove the fastening screws (E) of the electrical
connections of the four carbon brushes (F)
10 Remove the four carbon brushes (F) from
their housings, by disengaging them from the
retaining springs (G)
11 Check the two carbon brushes (F) for wear
Replace the carbon brushes when: the contact
with the motor armature is insufficient, the
carbon brushes are worn, the carbon brush
contact surface is not integral, the thrust spring
is broken, etc. If the length of the carbon brushes
is insufficient, these must be replaced.
In this cases, replace all motor carbon brushes.
Assembly
12 Assemble the components in the reverse order of
disassembly
P200316
Main motor carbon brush replacement (SW900 B)