SECTION 3
Owner’s Manual
Maintenance Requirements
55
G
EARCASE
P
RESSURE AND
V
ACUUM
T
ESTS
Lower Unit or Gearcase testing is sometimes required based on indicators noted during routine
maintenance of the motor or based on unforeseen maintenance actions due to equipment failure. These
tests are a definitive way to determine if your seals are faulty.
Test Procedure
Drain the oil from the gearcase as specified within this section.
Ensure that the Oil Fill Plug is reinstalled.
Install the gearcase pressure tester into the Oil Level Plug fitting.
Pump the pressure tester until the gauge indicates 3-6 PSI. Gearcase should maintain pressure
for 2 minutes.
If pressure loss occurs, determine source by submerging gearcase in water.
Once source is identified, make necessary repairs to correct the problem and retest.
Remove the pressure tester and install the gearcase vacuum tester.
pump vacuum tester until gauge indicates 3 - 5 in of mercury. Gearcase should maintain vacuum
for 2 minutes.
If loss of vacuum occurs, apply oil around suspected seal. If leak stops or oil is drawn in, the seal
is defective and must be replaced.
Make necessary repairs to correct the problem and retest.
Summary of Contents for NSN 3HD 2805-01-652-3076
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