- 24 - B.6.20.44-B
F22.060.02, issued on 01.98
If during daily inspection, a rise in pressure pulsation or irregular travel of the piston rod is observed,
wear at the decant valve (valve in the piston) is usually the reason. If the operating pressure falls
with the fluid pressure system closed (gun shut and sealed), the probable cause is a leaky suction
valve.
- In both cases, the respective valve should be changed.
If during the daily inspection with the reciprocating pump not working, the noise of air streaming out
of the sound absorber is heard, this can be a sign of progressive wear in the control system.
- If the noise increases over an observation interval of a few days, the flat slide and slide plate
should be replaced.
REPAIR
Repairs must be carried out by qualified personnel (experts) (VBG 87).
Before dismantling, completely interrupt the air pressure supply to the reciprocating pump
and remove the pressure from the pump.
After disassembly, thoroughly clean all parts to be reused.
Do not damage sealing surfaces; therefore do not throw parts around or knock them. Do not
use any cutting tools.
Renew all removed seals.
Lubricate all threads and fittings before assembly (grease lightly).
When traces of wear can be seen on running or sealing surfaces the components affected
must be exchanged.
The holes "X" in the hydraulic sections and in the screen PN500 are used for applying a sickle
spanner (see page 15), - do not use a pipe wrench.
Use only genuine repair parts. Our obligation to replace pumps / aggregates no longer
applies if non-genuine repair parts are used
(Product Liability Law of 15 December, 1989).
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