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Reverse gear
The HS1/HS1E reverse gear is hydraulic, which means that ahead/astern engagement and disengagement is
hydraulically activated. The reverse gear lubrication system has an oil filter and oil cooler. The HS1E is equipped
with solenoid valves for electronically controlled shifting.
IMPORTANT! Volvo Penta recommends the installation of a seawater filter to guarantee the proper coolant
water flow to the engine and reverse gear. Contaminants in the seawater will otherwise foul the reverse
gear radiator and other cooling system components.
Oil level. Checking and topping up
Unscrew (counter clockwise) and remove the dip-
stick. Wipe off oil. Reinsert the dipstick in the reverse
gear without screwing it in. Remove again and
check that the oil level is between the MAX and MIN
markings on the dipstick. Top up if necessary. For oil
grades and capacity: See the chapter “Technical
Data”.
IMPORTANT! Do not fill the oil above the MAX
level.
Oil change
Oil is sucked up using an oil scavenging pump
through the hole for the dipstick (1). Unscrew filter
(2). Check that the oil cooler mating surface is clean.
Moisten the new filter gasket with a little oil. Screw on
the new filter by hand until it is in contact with the
mating surface. And then a further half turn but no
more!
Collect up the old oil and filter for deposit at a
proper disposal site.
Top up oil to correct level. Start engine and run at
1500 rpm for a few minutes so the reverse gear oil
cooler is filled with oil. Stop engine and check oil
level. Top up if required. For oil grades and capacity:
See the chapter “Technical Data”.
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