35
SKF TKGT 1
4.2 Grease life / trend analysis
Application & lubrication conditions:
•
Medium sized electrical motor.
•
Four samples taken received at three intervals with 2 month in between.
Grease used:
•
Polyurea / Mineral - NLGI 2.5.
Nature of analysis:
Shelf life/Quality
Routine control
Damage
Grease performance
Trend analysis
Change of grease
Contamination expected
Other reasons: ..........................................................
Testing
1 2 3 4
Sample
First visual
inspection
(3.3)
Consistency test
(3.4)
Oil bleeding test
(3.5)
Contamination
test (3.6)
Fresh unused
1
Fresh, blue colour
NLGI class:
2.5
DAvFresh :
29
mm
SFresh :
581
mm
2
Sample:
2
(2 months)
Light darkening,
oily
NLGI class:
2.5
NLGI difference:
0
DAvUsed :
28
mm
SUsed :
537
mm
2
%Diff :
-8
Few particles.
Mainly
carbonized
particles
Small sized
Sample:
3
(4 months)
Stronger
darkening, oily
NLGI class:
3
NLGI difference:
+0.5
DAvUsed :
27.5
mm
SUsed :
515
mm
2
%Diff :
-11.5
Few particles.
Mainly
carbonized
particles
Small sized
Sample:
4
(6 months)
Severe darkening,
little oily (sticky,
dry)
NLGI class:
3.5
NLGI difference:
+1
DAvUsed :
22
mm
SUsed :
301
mm
2
%Diff :
-48
Many big
carbonized
particles.
Interpretation
Sample 2:
Sample 3:
Sample 4:
- Sample in good condition
- Sample in good condition
- Advanced grease degradation
Reconsider relubrication interval
X
Summary of Contents for TKGT 1
Page 1: ...SKF GreaseTest Kit TKGT 1 Instructions for use...
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