Edwards A311-01-985, Instruction Manual

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© Edwards Limited 2014. All rights reserved. Page 37
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Maintenance
A311-03-880 Issue A
There is oil in the gas stream from
the pump. Is an oil level too high? Check the oil levels and if necessary
drain oil from the pump: refer to
Section 5.5 .
Have the shaft seals failed? Replace the shaft seals.
Oil leaks from the drive shaft. Have the lip seals failed? Inspect the lip seals and replace if
necessary.
Oil leaks from between the casing
and an end-cover. Has the casing/end-cover seal
failed? Replace the seal.
Oil leaks from a sight-glass. Is the sight-glass loose? Tighten the securing bolts.
Has the seal failed, or is the glass
cracked? Replace the seal and/or sight-glass
as necessary.
The shaft-seals oil reservoir is empty. Has the reservoir been filled with
oil?
Fill the reservoir with oil as
described in
Section 5.3 .
Are there oil leaks at the shaft end? Replace the lip seal.
If there are no oil leaks at the shaft
end, replace the mechanical shaft
seals and lip seal.
There is a low volume flow through
the pump. Is the inlet filter blocked? Clean or replace the filter.
Is the inlet pressure too low? Check the inlet pipeline for a
blockage, closed valve or other
restriction.
Is the pump worn or damaged? Contact your supplier or Edwards for
advice.
Is the pump unsuitable for your
application? If necessary, redesign your system to
comply with the capabilities of the
pump, or fit a different pump which
provides the necessary performance.
Absorbed power is too high. Has debris or foreign material
entered the pump? Strip down, clean and repair the
pump as necessary.
Is the inlet filter blocked? Clean or replace the filter.
Is the pump unsuitable for your
application? If necessary, redesign your system to
comply with the capabilities of the
pump, or fit a different pump which
provides the necessary performance.
Is the motor or drive/transmission
system faulty? Check that your motor or drive and
transmission system is operating
correctly, and that it is correctly
fitted to the pump.
The pump cannot reach its specified
ultimate vacuum pressure. Is there a leak in the inlet pipeline? Check the inlet pipeline for any
valves open to atmosphere, or for
leaking connections.
Is the pump leaking? Check that all of the oil filler plugs
are fitted and are tight, and that the
inlet/outlet flange connections are
secure and do not leak.
Has the incorrect oil been used? Drain the pump and refill with the
correct oil: refer to
Section 5.7 .
Table 15 - Fault finding (continued)
Symptom Check Actions