Marquis 720 FLY, Owner'S Manual

Page: 106 / 126

94 7027 • A2 07/11
m
ainTenanCe
s
eCTion
7
PROPS
Inspect the props often . Keep a swim mask in the yacht to inspect the props while swimming . Out-of-balance or damaged props can
diminish the yacht’s performance by reducing speed, causing steering problems, and creating vibrations . Vibrations can lead to drive
train damage .
Have the propellers balanced by an established propeller repair shop at least once a year . Repair or replace damaged props .
DaNgEr
WEAR GLOVES WHEN HANDLING THE PROPELLER. THE PROPELLER bLADES ARE SHARP.
A Tip From Marquis!
consider purchasing and carrying a spare set of props onboard. Many marine dealers do not carry a full inventory of re-
placement propellers . A spare set allows your vacation or cruise to continue in the event that the primary set of props
are damaged.
STRUTS
Propeller shaft struts require very little maintenance . Within each strut is a cutlass bearing that provides a smooth surface for the shaft
to rotate . The cutlass bearings occasionally need to be replaced . However, bearing replacement is required more often if the yacht is
used in sand or within other abrasive materials . Have a marine technician inspect the strut bearings when the yacht is pulled . Replace
the bearings as recommended .
DC ELECTRICAL SYSTEM
Poor battery maintenance causes the majority of difficulties with the 12-volt DC electrical system . The factory-installed batteries
should function normally for several years if properly maintained . The heavy-duty batteries can be discharged and recharged repeat-
edly without damaging them; however, completely discharging or overcharging a battery can shorten its life span .
To maximize the useful life of the batteries:
• Use the voltmeters to frequently monitor the voltage level of each battery or battery bank while the engines are running and the
yacht is used .
Monitor the charge level with the engines turned off (static condition) .
•
Recharge the batteries, when not fully charged, using the onboard battery charger or the engine alternators . Refer to Section 2: •
Charging the Batterie s for more information . When the battery bank is fully charged, the voltmeter reads between 12 .3 and 12 .6
volts .
• Do not store partially charged batteries . Recharge each battery, if necessary . Check the voltage level every 30 days while the
battery is in storage . Recharge if the voltage reads 12 .3 or below .
WarNiNg
ELECTRICAL SHOCK MAY OCCUR IF THE bATTERIES ARE NOT DISCONNECTED DURING MAINTENANCE OF THE DC
ELECTRICAL SYSTEM.
Inspect the batteries every month .
Clean corrosion that has developed on the battery terminals . •
Spray terminal protector on the terminals and battery cable eye connectors . •
Make sure the battery cables are securely fastened to the terminals . •
Tighten the nuts only slightly beyond finger tight with a wrench . •
Spray the connections for the bridge instruments and switches with an electrical connection protector every six months .