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Brush Motor; Carbon Brush; Daily Maintenance; Regular/periodic Maintenance - Kärcher CV71/2 Operating Instructions Manual

Electric motor powered, wide area vacuum.
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MAINTENANCE
Vacuum Motor Carbon Brushes Replacement
Carbon
Brushes
If armature commutator is grooved, extremely pitted or not
concentric, the motor will need to be replaced or sent to a qualified
service center.
Important:
These brushes wear quicker as the length shortens due to
increased heat. Spring inside brush housing will damage motor if
brushes are allowed to wear away completely.
Periodically check the length of the carbon brushes. Replace both
carbon brushes when either is less than 3/8" (9.5mm) long.
The green ground wire must attach the motor to
the power cord for safe operation. See the wiring
diagram.
Note: When replacing electrical component parts
refer to wiring diagram for proper connection.
Note: The vac motor is protected by a circuit breaker
located in the switch panel. The breaker will only trip
under conditions of abuse.

BRUSH MOTOR

1. Access belt and brush as described above.
2. Disconnect spring holding frame to brush motor
housing.
3. Remove (4) bolts holding motor housing to the
chassis and lift out motor asm.
4. Remove brush motor pulley and (2) bolts holding
motor to bracket, lift out brush motor.

CARBON BRUSH

1. Access belt and brush as described above.
2. Remove brush caps. Note: Brushes should be
replaced when worn to 3/8" or less.
4-2
End Cap
3
8 [9.5mm]
86309230 CV71/2 02/19/08
Note: Before reinstalling brush motor bracket
assembly it's recommended that the rear spring be
reconnected to the flapper assembly.
Note: part no. 86001250 – prv no. 140212 if you
have a motor marked "leeson." Part no. 86135360 –
prv no. 14340 if you have a motor marked
"86247470 – prv no. 53617."

DAILY MAINTENANCE

1.
Shake down bag daily.
2.
Check power cord for damaged or frayed
insulation.
3.
Return brush adjustment lever to "STORE"
position when the machine is not in use.
4.
Check for and remove any lint or debris
around brush and brush housing.

REGULAR/PERIODIC MAINTENANCE

1.
Every 4 to 6 months remove wheels, clean axles,
and apply a thin coat of silicone lubricant to axles.
2.
The filter bag can be washed twice before losing
the filtering capability. This should be done using
a mild detergent in cool water and hung up to
drip-dry.
3.
Inspect and clean vac motor filters.
4.
Periodically inspect all hoses, electrical cables, filters,
gaskets and connections on your machine. Frayed or
cracked hoses should be repaired or replaced to
eliminate vacuum loss.
5.
The electrical cable must be well insulated, if the
cable insulation is broken or frayed, repair or
replace it immediately. Don't take chances with
electrical fire or shock.

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