Filter Cleaning Motor - No Function - Kärcher KMR 1250 B Service Manual

Troubleshooting Information
Filter cleaning Motor – No Function
1
Contact points filter housing
X4
-F1
A1
(10 A)
X1
X2
X10
Checking M3 motor input voltage
Fuse F1 (filter cleaning motor) on A1 circuit board
42
2
X5
-F2
-K1
(7,5A)
X3 X6
V
X11
M
-M3
A1
F1
(10A)
Check terminals (X 10 / X 11) in filter hous-
ing
Power for the filter cleaning motor is supplied via
two spring-loaded contact terminals (1).
With the debris container lowered, spring-load-
ed contact points (1) mounted on the divider baffle
must reliably make connection with rigid mating
contacts (2) on debris container, being depressed
by approx. 3 to 4 mm (0.12-0.16 in) in the proc-
ess.
Clean contacts, adjust contact position by install-
ing flat washers, or replace contacts as required.
1 Contacts on divider baffle, spring-loaded
2 Contact points on debris container, rigid
Check input voltage at M3 filter cleaning
motor
Each time ignition switch is set to "0" position,
filter cleaning motor automatically runs for ap-
prox. 15 seconds. Pressing filter cleaning button
while engine is running ( ignition switch in "I"
position) starts 15-second filter cleaning cycle.
To prevent dislodged dust from being drawn into
suction turbine, air flap must be closed before-
hand.
– Raise debris container.
– Press filter cleaning button.
– Check voltage on contact terminals X10/X11.
– If there is no voltage present, start by check-
ing fuse F1 (10 A) on A1 circuit board, then
check terminals X2/X3.
– If a voltage is present without shaker motor
running, check motor for ohmic resistance.
KMR 1250 B, LPG, D