48
- FORM NO. 56043071 CMAX
™
28/34ST / I-MAX
™
28/32C, BA 750/850ST, BA 750C
WHEEL DRIVE SYSTEM
DRIVE WHEEL REMOVAL (DISC)
WARNING!
Disconnect the battery pack connector before servicing machine.
WARNING!
Never work under machine without safety stands or blocking to support the machine.
1
Drain both the solution and recovery tanks. Next place the scrub deck in the up (stored) position, remove the splash guards and scrub
brushes.
2
Place wood blocking in front and rear of both caster wheels to prevent the machine from rolling.
3
Remove the left and right side chassis panels and then remove the drive chain (follow instructions in the
Chain Removal and Chain
Adjustment
section).
4
See Figure 4. Remove the two hardware items
(H
&
I)
from both front axle clamps
(J)
then loosen the two rear screws and nuts and swing
the clamps to the rear.
5
Next shim the bottoms of the brush deck drive discs (left & right) with wood blocking. Use blocking with approximate dimensions 3-1/2" wide,
3" thick and 20" long (9cm x 7.6cm x 51cm). Note: Two standard 2x4s stacked on top of each other (together) will match the proper thickness
(height) needed.
6
Next read the instructions for using the Service Test Mode steps 1-5 located in the electrical system manual section. Then enter the main
controller diagnostic Service Test Mode.
7
See the Know Your Machine section control panel drawing. When in the service test mode press the Scrub On/Pressure Increase Button
(G)
. This switch circuit is used to control the output to the scrub deck lift actuator. Pressing and releasing this switch will cycle the actuator
output, Up/Down and ON/OFF.
8
Activate the Switch
(G)
turning on the actuator where it runs to its down position and stops, then turn the key switch off and disconnect the
batteries. This operating of the lift motor will raise the frame off the floor creating the needed clearance to remove the drive wheel. Roll the
wheel forward then maneuver the wheel assembly out from the right side of the machine.
CAUTION!
When in the Service Test Mode don’t press (activate) the Scrub Off/Pressure Decrease Switch
(H)
when the wood blocking is
positioned under the scrub brushes as it will turn on the brush motors.
9
Make needed service repairs and re-install the drive wheel following the above steps in reverse order. Note: You must re-enter the Service
Test Mode to raise the scrub deck up away from the floor.
10
Test-drive the machine for proper operation.
Important Service Notes: Listed below are alternate lifting methods that can be used to raise and lower the chassis to remove the drive wheel.
•
Jack (raise) front of machine to where the drive wheel axle is able to clear the top wheel mount clamp bracket. Service Tip: Place a small
hydraulic bottle jack or mechanical scissors jack underneath the front of the scrub deck in the middle being careful not to damage solution
fittings.
•
Shown in the Electrical System is the actuator power cord adapter PN 56407502 and instructions for use. This tool can be attached to the
lift actuator for special output control to raise and lower the chassis with the placement of the above described wood blocking.
CHAIN MAINTENANCE
•
Every two months check the chain tension, 1/2 inch (13mm) deflection at mid point.
•
Once a month check chain for binding and dryness, apply oil to lube the chain links.
•
Yearly remove chain, clean and re-oil.
CHAIN REMOVAL AND CHAIN ADJUSTMENT
Chain Removal
WARNING!
Disconnect the battery pack connector before servicing.
1
See Figure 4. Loosen the (3) Motor Mount Bolts
(A)
. Note: If equipped with the optional parking brake, insert a 7/16" standard socket and
extension bar through the brake rotor access hole. Rotate the brake rotor to access and align the socket wrench with each individual mounting
bolt.
2
Loosen the Lock Nut
(B)
and back out the adjustment Bolt
(C)
several turns to help release the chain tension.
3
Remove the retainer clip from the chain’s master link, then separate and remove the chain from the sprockets.
4
Install a new chain and reconnect the master link and adjust chain tension (follow
Chain Adjustment
instructions). Service Tip: Push or pry
the motor forward to shorten the distance between the sprockets to make it easier to reconnect the master link.
