30
- FORM NO. 56043071 CMAX
™
28/34ST / I-MAX
™
28/32C, BA 750/850ST, BA 750C
SCRUB BRUSH SYSTEM
SCRUB BRUSH DECK ASSEMBLY REMOVAL (CYLINDRICAL)
1
Have the recovery tank drained. Then with the scrub brushes installed lower the brush deck, turn off key switch and disconnect the battery
pack connector.
2
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.
3
Remove from the deck the debris tray. Next remove the solution delivery hose and clamp from the solution Tee fitting (See Figure 4). Then
pull the hose back out through the deck’s lower actuator housing mount bracket.
4
Remove the Retaining Ring
(V)
and Pin
(W)
that secures the lower actuator (plastic) housing to its deck mount.
5
Note the correct wire connections to the scrub brush motors (for reinstallation) then remove the motor wiring at both Pos. and Neg. terminal
standoffs.
6
Using both a 17mm & 19mm wrenches remove the four sets of hardware items
(X, Y, Z & AA)
from the front deck lifting arms
(AB
&
AC)
.
7
Service Tip:
Do not disturb (change) the setting to the dismounted lift actuator plastic housing, for ease in re-assembly. Use a piece of tape
to secure it to the motor.
8
Carefully pull the deck forward to clear the lift actuator motor assembly and then slide it out from underneath the machine.
SCRUB BRUSH MOTOR(S) REMOVAL (CYLINDRICAL)
1
Have the recovery tank drained. Then with the scrub brushes installed lower the brush deck, turn off key switch and disconnect the battery
pack connector.
2
Remove the brush head cover (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.
3
See Figure 4. First remove the rear scrub deck Side Skirts
(AD)
held by (3) screws. Next remove the belt guards held in place by (4) screws.
4
Next loosen the scrub brush belt tension Hex screw in the center of the Belt Idler
(AE)
(using a 5/8" wrench).
5
See Figure 6 for motor wiring. Remove the wiring at both the Pos. & Neg. brush motor terminal studs and note the correct wiring connections
(for reinstallation). Then remove the (3) Screws
(AF)
and lift the motor out from the front or rear of the scrub deck.
6
Reassemble in reverse order and adjust the belt tension to 13/16-7/8 inches (20-22mm) as shown in Figure 5.
SCRUB BRUSH BELT REPLACEMENT (CYLINDRICAL)
1
See Figure 4. First remove the rear scrub deck Side Skirts
(AD)
held by (3) screws. Next remove the belt guards held in place by (4) screws.
2
Important Service Tip:
The left and right side drive belts are not the same lengths they must be ordered individually (P.N. 56407465, left
side & P.N. 56407466, right side).
3
Loosen the scrub brush belt tension hardware on the Belt Idler Pulley
(AE)
(using a 5/8" wrench). Pull the idler wheel away from the backside
of the belt and roll the belt off both the motor and brush pulleys. Then inspect for wear and replace as needed.
4
Re-install the drive belt and tension the belt as shown in Figure 5. Then install the belt guard, Side Skirts
(AD)
, reconnect the battery pack
and test the scrub system for proper operation.
SCRUB BRUSH SYSTEM MAINTENANCE (CYLINDRICAL)
The scrubbing system must be serviced at regular intervals to maintain good scrubbing performance. Follow the maintenance steps listed below.
1
Rinse clean, built up debris from the debris hopper drain holes (daily).
2
Clean drain holes in the solution delivery trough on top of the scrub deck (weekly).
3
Clean built up dirt from the inside of the scrub brush housing (weekly).
4
Remove any string wrapped around the scrub brush, drive hub and idler hub (weekly).
5
Remove both the scrub brushes and rotate, turn end for end (weekly). See
Scrub Brush Removal and Installation (Cyl)
section.
6
Inspect the scrub brush bristles for wear, the brushes should be replaced when the bristle length is 1 inch (26mm) or less (monthly).
SCRUB BRUSH REMOVAL AND INSTALLATION (CYLINDRICAL)
1
Make sure the key switch is off and disconnect the battery pack before servicing.
2
Loosen the black knobs (one on each side) that secure the removable bearing idler support Plate
(AG)
to the brush housing, then pull the
plates down and out to remove. Grip the scrub brush and slide it from the housing end.
3
To install the brush slide it into the housing, lift slightly, push and turn until it seats into the drive end assembly.
4
Re-install the idler end plate assemblies.
SCRUB BRUSH LIFT ACTUATOR REMOVAL (CYLINDRICAL)
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.
