Elmo Rietschle L-BV7 - Manual (Page 40)

610.48060.40.000 40 / 64 © Gardner Denver Deutschland GmbH
Servicing
Fault Cause Remedy Carried out by
Unit too small. Use larger unit. Operator
Operating-liquid
flow too low. Increase operating-liquid flow rate to up to 2x the
nominal flow rate.
See Chapter 8.2, "Self-priming operation", Pg. 30
or Chapter 8.3, "Operation with operating-liquid
feed", Pg. 31. Operator
Operating liquid
too warm
(nominal
temperature:
15°C [59 °F]). Cool or increase operating-liquid flow,
See Chapter 8.2, "Self-priming operation", Pg. 30
or 8.3, "Operation with operating-liquid feed",
Pg. 31. Operator
Inspect impeller. To do so, proceed as follows:
 Shut unit down.
 Drain the pump-motor unit as described in
Chapter 10.1, "Draining", Pg. 34.
 Unscrew the housing with a 36 mm [ 3 /
8
"]
wrench (in direction of arrow shown on
housing) (see Fig. 15, Pg. 38).
 Remove the housing.
 Examine the impeller for erosion.
 Have the impeller replaced by Service if
necessary.
 Screw on the housing again (opposite
direction of arrow shown on housing) and
tighten with a tightening torque of 50 Nm [36.9
ft lbs].
 When commissioning the pump-motor unit,
proceed as described in Chapter 8,
"Commissioning", Pg. 28.
Operator Erosion.
Replace affected components. Service
Slight leak in the
system. Seal leak in the system. Operator
Unit
generates
insufficient
vacuum.
Mechanical seal
leaky. Replace mechanical seal. Service
Cavitation of
vacuum
pump/compressor
. Connect cavitation-protection hose of liquid
separator (see Chapter 13.5, "Cavitation
protection", Pg. 49) or clean cavitation-protection
equipment. Operator Abnormal
screeching
noise.
Operating-liquid
flow rate too high. Check operating-liquid flow rate and reduce if
necessary. See Chapter 8.3, "Operation with
operating-liquid feed", Pg. 31. Operator
Unit leaky. Seals defective. Check seals. Service