FORM NO. 56043071 CMAX
™
28/34ST / I-MAX
™
28/32C, BA 750/850ST, BA 750C -
27
SCRUB BRUSH SYSTEM
SCRUB BRUSH DECK REMOVAL (DISC)
1
Remove the machine’s molded front panel (held in place by 6 screws). Note: Use a 1/4 inch Allen (hex key) wrench on the front cover screws
and a 5/16 inch wrench on the side screws.
2
With scrub brushes installed and the brush deck in the up (storage) position disconnect the actuator motor wiring harness pig tail connector.
3
Next connect the Nilfisk-Advance actuator power cord adapter (PN 56407502) to the machine’s battery pack and lift actuator motor pig tail
connector.
4
Press the cord adapter rocker switch to momentarily run (jog) the actuator output (up and down) to a position where the bottom deck Actuator
Pin
(H)
is loose (see Figure 2). Remove the Cotter Pin
(I)
from the lower Actuator Pin
(H)
and pull the pin from the mount bracket, to separate
the lower actuator mounting point.
5
Remove the left side chassis panel from the machine (3 screws).
6
Remove the Solution Hose
(A)
from the outlet barb at the solenoid valve.
7
Remove the (4) sets of hardware items
(B)
,
(C)
&
(D)
from the deck Lift Arms
(E)
(two hardware groupings from the left front and two from
right rear) as shown. Note: Don’t lose the Bearing Sleeve
(F)
and Bushing
(G)
insert in the ends of the lift support arms.
8
Pull the scrub deck forward 12 inches (30cm) to access the motor wiring terminal block.
9
Remove the motor wiring at the terminal block and then pull the brush head assembly completely from the machine. Note: See Figure 3
for the correct wiring illustration for rewiring each model.
SCRUB BRUSH LIFT ACTUATOR REMOVAL (DISC)
1
Remove the machine’s molded front panel (held in place by 6 screws). Note: Use a 1/4 inch Allen (hex key) wrench on the front cover screws
and a 5/16 inch wrench on the side screws.
2
With scrub brushes installed and the brush deck in the up (storage) position disconnect the actuator motor wiring harness pig tail connector.
3
Next connect the Nilfisk-Advance actuator power cord adapter (PN 56407502) to the machine’s battery pack and lift actuator motor pig tail
connector.
4
Press the cord adapter rocker switch to momentarily run (jog) the actuator output (up and down) to a position where the bottom deck Actuator
Pin
(H)
is loose (see Figure 2). Remove the Cotter Pin
(I)
from the lower Actuator Pin
(H)
and pull the pin from the mount bracket.
5
Remove the Hex Screw
(J)
and Nut
(K)
that secures the upper Actuator Yoke
(L)
at the frame mount.
6
Tilt the motor assembly to the rear then maneuver the actuator out of the machine from the front of the brush deck.
7
See
*Important Service Note
below.
Note:
If the lift actuator motor will not run it will be necessary to jack up the front of the machine or shim up the brush deck to remove the weight
on the lower deck Actuator Pin
(H)
to remove.
*Important Service Note:
After removing any actuator motor and before installing a new motor or drive nut the IN and OUT limit switches must
be set (or checked) to their correct specifications. Reference the Electrical System in this manual for the
Actuator Drive Nut Adjustment
and follow
these instructions before replacing the actuator motor.
After setting the correct actuator nut adjustments for the scrub brush lift motor, follow removal steps in reverse order to reassemble.
SCRUB BRUSH MOTOR/GEARBOX REMOVAL (DISC)
1
Follow steps 1-9 in the
Scrub Brush Deck Removal (Disc)
section.
2
Turn the brush deck on its side.
3
Remove the scrub brushes from the brush holders then mark the location of the motor to the brush deck for proper re-assembly.
4
See Figure 2. Remove the (3)
(M)
Hex Screws and (3)
(N)
Nuts from each Flexible Coupler
(O)
.
5
Next remove the (3) Hex Lock Screws
(P)
that connect the coupler to the Drive Hubs
(Q)
and remove the brush holder(s)
(R)
.
6
Remove the hardware items
(S & T)
that secure the Hub
(Q)
to the output shaft on each gearbox. Then pull the hub from the shaft and save
the key.
7
Remove the (4)
(U)
Screws and separate the motor/gearbox assembly from the scrub deck that needs replacement.
8
Re-assemble in reverse order and test for proper operation. Note: Apply a small amount of grease or a product called “Never Seize” to the
gearbox output shaft when reinstalling the Drive Hub(s)
(Q)
.
