Problem
Possible causes
Remedy
Vacuum pump does not reach
the specified final pressure
● Condensate in the vac-
uum pump
● Operate the vacuum pump at at-
mospheric pressure for a longer
period.
● Gas ballast valve open
Close the gas ballast valve.
● Soiled valves or dia-
phragms
● If necessary, clean or replace the
valves and diaphragms.
● Leak in system
● Locate and eliminate the leak.
Pumping speed of vacuum
pump too low
● Intake line not well-di-
mensioned
● Make sure that connections are
short and cross sections ade-
quately dimensioned.
● Exhaust pressure too
high
● Check exhaust line outlet open-
ing and exhaust side accesso-
ries.
Unusual noises during opera-
tion
● Defective valves or dia-
phragms
● If necessary, clean or replace the
valves and diaphragms.
● Suction chamber dirty
● Clean suction chamber.
● Silencer loose or miss-
ing
● If necessary, check or replace
the silencer.
● Valves dirty or defec-
tive
● If necessary, clean or replace the
valves and diaphragms.
● Motor fan defective
● Contact
● Connection rod or mo-
tor bearing defective
● Contact
Tbl. 8:
Troubleshooting on diaphragm pumps
Malfunctions
47/58
