FORM NO. 56043071 CMAX
™
28/34ST / I-MAX
™
28/32C, BA 750/850ST, BA 750C - 47
WHEEL DRIVE SYSTEM
DRIVE MOTOR REMOVAL (ALL MODELS)
WARNING!
Disconnect the battery pack before servicing machine.
1 Remove the left side chassis panel to access the drive motor.
2 Disconnect the drive motor wiring connector.
3 See Figure 4. Loosen the (3) Motor Mount Bolts (A) then loosen the Lock Nut (B) and back out Adjustment Bolt (C) several turns to loosen
the drive chain tension.
4 Remove the retainer clip from the chain’s master link then separate and remove the chain from the sprockets.
5 Loosen both the Set Screws (D) from the drive motor Sprocket (E) then pull the sprocket off the motor shaft. Note use a 1/8" Hex socket
to loosen the set screws.
6 Support the Drive Motor, remove the (3) Motor Mount Bolts (A) then remove the motor and the chain tensioner Bracket (G) from the machine.
7 Follow steps 1-6 in reverse order to reassemble, then refer to the chain adjustment section to retention the chain. Note: Make sure drive
motor Sprocket (E) and the drive wheel sprocket are in alignment.
DRIVE WHEEL REMOVAL (CYLINDRICAL)
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 remove the scrub deck debris hopper and have the scrub deck in the up (stored) position
with the scrub brushes installed.
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 bottom of the brush deck housing in the middle (front to back) with wood blocking. Use blocking with approximate dimensions
3-1/2" wide, 2-1/4" thick and 15" long (9cm x 5.7cm x 38cm). Note: A standard 2x4 and 1x4 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.
• 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 (connector) for special output control to raise and lower the chassis with the placement of the above described wood blocking.
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