2 Reference information
2.1.6 Performing a leak-down test
3HAC 16245-1 A 25
2.1.6 Performing a leak-down test
General After refitting any motor and any gearbox, the integrity of all seals enclosing the gearbox oil
must be tested. This is done in a leak-down test.
Required equip-
ment
Procedure
Equipment, etc. Spare part no. Art. no. Note
Leakdown tester 3HAC 0207-1
Leak detection spray
Step Action Note/Illustration
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 may be required, which are included
in the leakdown tester kit.
Art. no. specified above!
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
must be detected.
If the compressed air is signifi-
cantly colder or warmer than the
gearbox to be tested, a slight pres-
sure increase or decrease respec-
tively 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.
Art. no. specified above!
8. When the leak has been localized: take the nec-
essary measures to correct the leak.
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