Kärcher HD 1090, Service Handbook

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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