4 Repair
4.2.1. Performing a leak-down test
3HAC022033-001 Revision: K246
© Copyright 2004-2011 ABB. All rights reserved.
4.2 General procedures
4.2.1. Performing a leak-down test
General
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
Procedure
Equipment, etc. Art. no. Note
Leakdown tester 3HAC0207-1
Leak detection spray -
Action Note
1. Finish the refitting procedure of the motor or gear in
question.
2. Remove the topmost oil plug on the gear in question
and replace it with the leakdown tester.
Adapters, which are included in the leakdown tester
kit, may be required.
Art. no. is specified in Required
equipment on page 246.
3. Apply compressed air and raise the pressure with the
knob until the correct value is shown on the
manometer.
Recommended value:
0.2 - 0.25 bar (20 - 25 kPa)
4. Disconnect the compressed air supply.
5. Wait for approx. 8-10 minutes. No pressure loss may
be detected.
If the compressed air is signifi-
cantly colder or warmer than the
gearbox to be tested, a slight
pressure increase or decrease
may occur. This is quite normal.
6. Was any pressure drop evident?
Localize the leak as detailed below.
Remove the leakdown tester and refit the oil plug.
The test is complete.
7. Spray suspected leak areas with leak detection spray.
Bubbles indicate a leak.
8. When the leak has been localized, take the necessary
measures to correct the leak.
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