Elmo Rietschle L-BV7 User Manual

Page 40

610.48060.40.000

40 / 64

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 [

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