Coupling; Elastomer Elements; Checking The Elastomer Elements For Wear; Roller Bearings - Biber OSKA9563 Instructions De Service

• wear
• corrugations
• material deposits
• oil carbon
• copper plating
Leakage oil quantities up to approx. 0.2 cm
ing hour are within the tolerance range. Leakage oil
which may escape can be drained via an oil drain pipe
at the flange of the shaft seal.
Increased oil leakage is possible during the running-in
period of the shaft seal (approx. 250 hours).
Recommended replacing interval: 20,000 .. 40,000 h.
Fig. 3: Checking the elastomer elements of the coupling

8.7 Roller bearings

BITZER screw compressors are equipped with durable
roller bearings. Therefore, a replacement is generally
not required.
8.7.1

Checking the roller bearings

The roller bearings are checked by means of the noise
analysis.
Recommended test interval: 10,000 h.
Information
When replacing the roller bearings, visually
check the rotors, the housing and the discharge
flange.
In case of deep corrugations or abnormal wear,
a general overhaul of the compressor by
BITZER or Green Point or its replacement is re-
commended.
14

8.6 Coupling

8.6.1
Check the elastomer elements of the coupling after the
running-in period and then once a year, see figure 3,
page 14.
3
per operat-
8.6.2
• Turn both coupling halves without torque against
each other to the stop.
• Mark both halves.
• Turn coupling halves also without torque to the other
direction to the stop.
• Measure radial distance between the two marks.
• Replace all elastomer elements if the distance is
more than 4 mm.
m a x . 4 m m
8.7.2
Recommended replacing interval: 40,000 .. 50,000 h.
In this case, the entire service life of the roller bearings
is not used.
The bearings may need to be replaced due to occa-
sional deviations from the standard operation, such as
lack of oil, wet operation or thermal overload.

9 Decommissioning

9.1 Standstill

Leave the oil heater switched on until disassembly.
This prevents increased refrigerant concentration in the
oil.

Elastomer elements

Checking the elastomer elements for wear

Replacement of the roller bearings

SB-520-1