Kärcher HD 1090 How to use

HD 1090
Service Handbook
0
I
5.905-212
03.02

Foreword
Good servicing requires extensive and relevant training as well as comprehensible reference
documents.
We therefore regularly offer all service technicians both basic and ongoing training courses for the
full range of our products.
In addition we produce service handbooks for the major equipment which can be used initially as
instructional material and subsequently as sources of reference.
Furthermore we regularly distribute service information bulletins that provide details about further
developments to the products.
Copying and duplicating texts and illustrations, or passing the contents on to a third party, requires
the express permission of:
ALFRED KÄRCHER GmbH & Co.
CUSTOMER SERVICE TRAINING
PO Box 160
D-71349Winnenden

1
Contents
Unit function ....................................................................................2-15
Equipment.............................................................................................................................. 2
Functional diagram ................................................................................................................ 4
Pump ..................................................................................................................................... 6
Pressure and flow control with the Servopress handgun......................................................8
Detergent injector with non-return valve.............................................................................. 10
Detergent metering valve .................................................................................................... 11
Hand gun with pressure and flow control
Servopress with low-effort version.......................................................................................12
Changeover nozzle.............................................................................................................. 14
Circuit diagram 0.087-804 ...................................................................................................15
Troubleshooting and basic settings............................................. 16-29
Unit does not run ................................................................................................................. 16
Unit does not reach required pressure................................................................................18
Unit switches on and off continuously .................................................................................23
No detergent function .......................................................................................................... 26
Water escaping between cylinder head and housing .........................................................27
Oil escaping between cylinder head and housing .............................................................. 28
Swash plate/shaft sealing ring/motor bearing defective ..................................................... 29
Special tools ....................................................................................... 30
Technical data................................................................................ 31-32

2
Unit function
Equipment
10
15
12
9
10
13
11
14
16
1
8
2
34
5
6
7
0
I

3
1 changeover nozzle
2 spray lance
3 servopress handgun
4 adjusting wheel for pressure and flow control
5 high-pressure hose
6 handle
7 detergent metering valve
8 detergent tank cover
9 detergent tank
10 detergent suction hose with filter
11 hood mounting screw
12 water inlet with strainer
13 high-pressure connection
14 unit switch
15 pressure gauge
16 handle mounting screws
Unit function
Equipment

4
Unit function
Functional diagram
5
3
7
8
9
10
11
12
13
14
2
1
15 16 17
4
6

5
Any unit without a float tank should not be
connected directly to the water inlet. A non-
returnvalve(7)atthewatersupplyisintendedto
prevent detergent from getting into the supply
network.
Fromthewatersupplywith non-returnvalve(7),
thewaterflowsthroughthethreecoolingcoilsin
the motor housing (12) to the pump (13).
The pump (13) transports the water through the
high-pressure hose (1), the hand gun (15) and
the spray lance (16) to the changeover nozzle
(17).
Operatingpressureandflowquantity canbeset
with the hand gun (15).
If the changeover nozzle (17) is set at high-
pressure, the non-return valve (3) seals off the
detergent suction hose (5) to prevent any water
from flowing into the detergent tank (6).
As soon as the metering valve (4) is open and
thechangeovernozzle(17)issetatlow-pressu-
re, detergent is taken in from the detergent tank
(6) by the injector (2).
In the event of suction from an open tank (10),
the water inlet hose (8) must be replaced by a
water suction hose with filter and non-return
valve (7).
The motor (12) is cooled via the cooling coils in
themotor housing (water cooling) andby the air
current of the fan wheel (11) (air-cooling).
Unit function
Functional diagram
1 high-pressure hose
2 injector
3 detergent non-return valve
4 detergent metering valve
5 detergent suction hose with filter
6 detergent tank
7 water inlet with non-return valve
8 water inlet hose
9 suction hose with filter and non-return
valve
10 open tank
11 fan wheel
12 motor with cooling coils
13 pump
14 pressure gauge
15 hand gun with Servopress
16 spray lance
17 changeover nozzle

6
Unit function
Pump
15
17
18
1012
13
11
14
16
20
912 11
1
8
2
34
5
6
7
11
1921

7
1 suction valve
2 pressure valve
3 pressure gauge
4 oil reservoir
5 motor shaft
6 shaft seal
7 motor bearing
8 swash plate
9 piston glide shoe
10 piston spring
11 piston
12 oil seal
13 washer
14 low-pressure seal and support ring
15 bushing
16 washer
17 high-pressure seal
18 support ring
19 piston housing
20 O-ring
21 cylinder head
Unit function
Pump
Function
The pump is a 3-piston swash plate pump with
driverunninginanoil bath.Itisdirectlyattached
to the motor shaft, therewith achieving optimal
efficiency. When the piston returns, the water is
taken in via the open suction valve. The advan-
cing piston closes the suction valve and the
water is transported to the nozzle via the open
pressure valve.The operating pressure genera-
teddepends onthediameterofthenozzlebore.

8
Unit function
Pressure and flow control
with the Servopress handgun
1
2
4
3