4.2 General procedures
4.2.1 Performing a leak-down test
When to perform a leak-down test
After refitting any motor and gearbox, the integrity of all seals enclosing the gearbox
oil must be tested. This is done in a leak-down test.
Required equipment
Note
Article number
Equipment, etc.
3HAC0207-1
Leak-down tester
-
Leak detection spray
Performing a leak-down test
Note
Action
Finish the refitting procedure of the motor or gear in
question.
1
Art. no. is specified in
.
Remove the topmost oil plug on the gear in question
and replace it with the
leak-down tester
.
Regulators, which are included in the leak-down test,
may be required.
2
Correct value:
Use caution, apply compressed air and raise the
pressure with the knob until the correct value is
shown on the manometer.
CAUTION
The pressure must under no circumstance be higher
than 0.25 bar (20 - 25 kPa). Also during the time when
the pressure is raised!
3
0.2 - 0.25 bar (20 - 25 kPa)
Disconnect the compressed air supply.
4
If the compressed air is signific-
antly colder or warmer than the
gearbox to be tested, a slight
pressure increase or decrease
may occur. This is quite normal.
Wait for approximately 8-10 minutes and make sure
that no pressure loss occurs.
5
If any pressure drop occurred, then localize the leak
as described in step 7.
6
If no pressure drop occurred, then remove the leak-
down tester and refit the oil plug. The test is complete.
Spray any suspected leak areas with the
leak detec-
tion spray
. Bubbles indicate a leak.
7
When the leak has been localized, take the necessary
measures to correct the leak.
8
190
3HAC033453-001 Revision: H
© Copyright 2009-2013 ABB. All rights reserved.
4 Repair
4.2.1 Performing a leak-down test
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