![background image](http://html2.mh-extra.com/html/karcher/hd-1090/hd-1090_service-handbook_3833971029.webp)
27
Troubleshooting and basic settings
Water escaping between cylinder head and housing
Low-pressure seal disassembled
Install seal with mounting mandrel
Removing high-pressure seal
High-pressure seal defective
– A leak of one drop per minute per piston is
permissible.
– Remove cylinder head head bolts and take off
cylinder head.
– Carefully dismantle the high-pressure seals.
Use an internal extractor if necessary.
Note:
Do not damage the sealing surface in the
cylinder head.
– Check all parts for defects. Replace if neces-
sary.
– Grease any new high-pressure seals ge-
nerously with silicone grease and install with
the mounting mandrel (special tool).
– Pay attention to the mounting position: the
sealing lips and support ring must point to the
cylinder head.
Low-pressure seal defective
– Remove the low-pressure sealing bushing
from the piston.
– Check all parts for defects. Replace parts if
necessary.
– Grease all parts lightly with silicone grease
and assemble.
– Pay attention to the mounting position of the
low-pressure seal. The flat side should point to
the brass washer.
– Assemble the cylinder head, observing tighte-
ning torque (see technical data).
Silicone
grease
Summary of Contents for HD 1090
Page 1: ...HD 1090 Service Handbook 0 I 5 905 212 03 02...
Page 4: ...2 Unit function Equipment 10 15 12 9 10 13 11 14 16 1 8 2 3 4 5 6 7 0 I...
Page 6: ...4 Unit function Functional diagram 5 3 7 8 9 10 11 12 13 14 2 1 15 16 17 4 6...
Page 8: ...6 Unit function Pump 15 17 18 10 12 13 11 14 16 20 9 12 11 1 8 2 3 4 5 6 7 11 19 21...
Page 10: ...8 Unit function Pressure and flow control with the Servopress handgun 1 2 4 3...
Page 14: ...12 Unit function Handgun with pressure and flow control Servopress with low effort version...