13
Pump head repair
Practical tip
Use new seal.
Removing the piston
guide
Process
Figure
A Remove the parts
and securely deposit
them in the proper
sequence and in the
correct orientation.
A Low-pressure seal
B Washer
C Compression spring
D Bushing
E Piston
guide
F Piston
rod
Fig. 5
Parts of the piston guide
A B
C
D
E
F
Legend
A High-pressure seal
from with metal wire
mesh to the feed
block
B Sapphire ring
C Adaptor ring for sap-
phire ring with guide
to the outside
D Piston
Fig. 6
Principle of the internal structure of the piston guide
A
B
C
D
Replacing seals on the
inner side of the feed
block
Process
Figure
A Special tool for
dismantling the seals
B Feed block
1. Screw the special
tool into the seal and
pull from the feed
block.
Fig. 7
Special tool with feed block
A
B
