System Check
After filling, purging, and setting the fluid level the system must be checked for proper connections, possible leaks, and
complete purging of air.
IMPORTANT: In the following procedure, turn the wheel with enough force to exceed the pressure relief valve in the helm. This
action should not harm the helm or the system.
1. Turn the steering wheel (any wheel on a multi‑steering station) very hard to port to pressurize the system.
2. While maintaining pressure, check all port fittings and hose connections. Ensure that there are no leaks. If leaks are
present, correct them before using.
3. Turn steering wheel (any wheel on multi‑steering station) very hard to starboard to pressurize system.
4. While maintaining pressure, check all starboard fittings and hose connections. Ensure that there are no leaks. If leaks are
present, correct them before using.
NOTE: Observing a significant drop in the fluid level at the helm while performing the system check may mean you are
compressing air. Further filling and purging would be required.
5. If no leaks are present, the system is ready for service.
Bravo Sterndrive Gear Lube
Checking
NOTICE
Discharge of oil, coolant, or other engine/drive fluids into the environment is restricted by law. Use caution not to spill oil,
coolant, or other fluids into the environment when using or servicing your boat. Be aware of the local restrictions governing
the disposal or recycling of waste, and contain and dispose of fluids as required.
IMPORTANT: The gear lube level fluctuates during operation. Check before starting, when the engine is cold.
NOTE: The gear lube monitor bottle has a sensor in it that is connected to the engine warning system.
1. Check the gear lube level in the monitor bottle. Keep the gear lube level within the recommended operating range.
a - Gear lube monitor cap
b - Maximum range
c - Minimum range
2. Inspect the gear lube condition. If any water is visible in the bottom of the gear lube monitor, if water appears at the fill and
drain plug hole, or if the gear lube appears discolored, there may be a water leak in the sterndrive.
Filling
New installations may require as much as 470 mL (16 fl oz) of gear lube added to the monitor bottle during the break‑in period
(20 hours of running time). It is important to monitor and maintain the gear lube level during the break‑in period.
IMPORTANT: The gear lube monitor must be checked and filled if necessary at the beginning of each day when the engine is
cold. If the gear lube alarm sounds during the day's activity, add the appropriate amount of gear lube to the monitor bottle.
NOTE: If filling the entire sterndrive, see
Changing
.
1. Remove the gear lube monitor cap.
2. Fill the monitor with the specified fluid until the gear lube level is in the operating range. Do not overfill.
Tube Ref No.
Description Where Used Part No.
87
High Performance Gear
Lubricant
Gear lube monitor 92-858064K01
Maintenance
Page 1C-22 © 2016 Mercury Marine 90-8M0099748 eng DECEMBER 2015
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