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The upper wear protection sits inside the upper pump housing. It is not held by
fasteners.
4.6.9 Check the seal tightness
After mounting a new seal, check that it is tight. Leakage can be detected by applying a
vacuum in the seal housing, and monitoring any change of pressure over time.
1. Apply a negative differential pressure of about 0.5–0.7 bar (0.5–0.3 bar absolute
pressure) in the empty seal housing.
2. After applying the correct pressure, close the evacuation line using a valve.
3. Monitor the change of pressure using a pressure gauge.
4. Compare the result with the maximum allowed pressure change.
P
max
= 0.017 P
d
X
X
V
t
WS004937A
ΔP
max
= maximum allowed pressure change in the test object
P
d
= differential pressure (bar)
t = test time (minutes)
V = the volume of the oil chamber, usually 1.2 × oil volume (liter)
WARNING: Compressed Gas Hazard
Compressed air/gas may cause parts to be propelled with force. Never apply compressed
air/gas to any cavity.
4.6.10 Install the impeller: Drainage version
1. Prepare the shaft:
a) Polish off any flaws with a fine emery cloth.
The end of the shaft must be clean and free from burrs.
b) Coat the inner conic, the outer cylindrical surfaces, and the thread of the conical
sleeve with a thin layer of grease.
The proper lubrication is grease for bearings, for example Exxon Mobil Unirex N3,
Mobil Mobilith SHC 220 or equivalent.
NOTICE:
Surplus grease can cause the impeller to become loose. Remove surplus grease
from conical and/or cylindrical surfaces of shafts and/or sleeves.
WS006895A
2. Align the edge of the adjustment screw with the edge of the conical sleeve so that they
are flush.
4 Maintenance
2640.181/.281 Service and Repair Instructions
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Summary of Contents for FLYGT 2640.181
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