Repair instructions
Pressure and vacuum testing Before filling the drive with gear oil, it must be pressure and vacuum tested to verify proper sealing during assembly.
a) Connect a pressure tester 3810152 to the drain hole and pressurise the drive to 21–35 kPa. Turn the propeller shaft(s) and the drive shaft universal joint to check for tightness. If any pressure loss is indicated, use a soapy water solution, or dip the drive into water to find the leakage point. Do the necessary repairs and then repeat the test. b) If no pressure loss is indicated, increase the pressure to 110–124 kPa. Again use a soapy water solution or dip the drive to find the leakage point if the drive looses pressure. Do the necessary repairs and then repeat the test. The drive must hold its pressure before the vacuum test is done, and must not loose more than 7 kPa in 3 minutes.
Pressure/vacuum test the drive as follows: 1. Remove the drain plug and drain the oil from the drive. If the drive has not been used for some time, a small amount of water can run out (a few drops). If the drive has been used in the previous few days, it can be more difficult to observe a small amount of water. 2. Please refer to chapter Technical Data for the correct tightening torques for the upper gear housing, intermediate housing and lower gear housing. 3. Remove the drain plug and screw the dipstick with O-ring back into the upper housing.
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c) Connect a vacuum tester 3858578 to the drain hole and evacuate the drive to 10–17 kPa (75–125 mm Hg). Turn the propeller shaft(s) and the drive shaft universal joint to check for tightness. If the drive can not hold its vacuum, apply thick oil along the joint surfaces to find the leakage point. The oil is sucked in at the leakage point and when the joint is subsequently taken apart, the oil is visible on the sealing surface (gasket). Do the necessary repairs and then repeat the test. No loss of vacuum must occur during the test. d) If no vacuum loss is indicated, increase the vacuum to 47–54 kPa (355–405 mm Hg). Apply a new film of thick oil to find the leakage point if the drive does not hold vacuum. Do the necessary repairs and then repeat the test. The drive must not loose more than 25 mm Hg (3.4 kPa) during 3 minutes. Repair the leak and retest the unit. NOTE! Do not fill the drive with oil unless it passes both the pressure test and the vacuum test.
