C7-34 Fan Clutch C07001
TEST PROCEDURE
1. The fan clutch should be fully locked up with 275 kPa (40 psi) oil pressure supplied at the control pressure
port.
2. Operate the fan clutch with 82° C (180° F) oil supplied to the “oil in” port for 2 hours. Manually engage and
disengage the clutch during the test to operate seals in both modes. Restrict the fan mounting hub rotation
while the clutch is disengaged, but ensure that the fan mounting hub is allowed to rotate freely while the clutch
is engaged.
The fan clutch rotation causes the pitot tubes to pump lubricating oil from inside the fan clutch,
maintaining low internal oil pressure. If lubricating oil is supplied to the fan clutch before it is rotating in
the proper direction, internal pressures will become excessive, causing the oil seals to leak.
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