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LOWER UNIT
CHECKING THE LOWER UNIT (FOR AIR
LEAKS)
Check:
Lower unit holding pressure
Pressure drops
and components.
Lower unit holding pressure:
100 kPa (1.0 kgf/cm
10 seconds
Checking steps:
CAUTION:
Do not overpressurize the lower unit.
Excessive pressure may damage the oil
seals.
(1)Remove the gear oil level check screw.
(2)Install the leakage tester 1 or mity vac
into the check hole.
Leakage tester:
NA/90890-06762
Mity vac:
YB-35956-A/90890-06756
(3)Apply the specified pressure.
(4)The lower unit should hold the
specified pressure for 10 seconds.
(5)Remove the pressure tester 1, then
install the gear oil level check screw.
Gear oil level check screw:
7 N
m (0.7 kgf
3-21
Check the seals
2
, 14.2 psi) for
m, 5.1 ft
lb)
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