Scrub Brush Motor Assembly Removal (Disc); Scrub Brush Gearbox Removal And Output Shaft Replacement (Disc) - Nilfisk-Advance 56390900 Service Manual

Scrub Brush System

SCRUB BRUSH MOTOR ASSEMBLY REMOVAL (DISC)

Service Note: The items listed; shaft dust covers, keys, output shafts, shaft mounting hardware and gear-box mounting brackets, must be
salvaged (saved) and reused when replacing the complete motor and gear-box assembly. As shown in Figure 3.
1 Follow steps 1-7 of the Scrub Brush Deck Removal (Disc & Cylindrical) section.
2 See Figure 3. Remove the scrub brushes from the Brush Holders (F).
3 Remove the (3) Screws (G) from each thermoid disc (flexible coupler) (H) and remove the Brush Holders (F) from both (I) Hubs. Note: Use a
13mm socket wrench to remove Screws (G).
4 Remove all (8) hardware items (J & K) that secure the gear case Mount Brackets (L) to the scrub deck plate. Then remove the complete
Motor Assembly (M) from the scrub deck by pulling it straight up.
5 Remove the (8) hex Screws (P) that secure the Mounting Brackets (L) to the gearboxes and separate.
6 Remove the (8) (Q) Screws (use a 5mm hex wrench) that hold
in place the Dust Covers (R). Next remove the shaft retainer
hardware items (S & T). Then tap out the Output Shaft (U) using
a brass shaft to help prevent any possible damage.
7
Re-assemble in reverse order and test for proper operation.
Note: The proper motor installation position is where the two
motor wires face the front and left side on the scrub deck
platform.
SCRUB BRUSH GEARBOX REMOVAL
AND OUTPUT SHAFT REPLACEMENT
(DISC)
1
Follow steps 1-7 of the Scrub Brush Deck Removal (Disc &
Cylindrical) section and steps 2-6 of the Scrub Brush Motor
Removal (Disc) section.
2 See Figure 3. Remove the hardware items (N & O) that secure
the Hub (I) to the Output Shaft (U) then pull the hub from the
shaft and save the key. Note: Skip this step if shaft does not
need to be replaced.
3
Remove the (4) socket head cap screws (use a 5mm hex
wrench) securing the gearbox that needs replacement.
4 Re-assemble in reverse order and test for proper operation.
Service Tip: Apply a small amount of grease or "Never Seize" to
the gearbox output shafts when reinstalling the drive Hub(s) (I).
Note: The gearbox output shafts rotate the brush holders in the
opposite direction of other Nilfisk-Advance automatic scrubbers (see
below).
Left
FRONT
Right
Q
S
T
U
P
I
N
O
G
FORM NO. 56043136 - Adgressor
FIGURE 3
R
M
L
J
K
H
F
FRONT
/ BR 850S, BR 1050S - 33
™