Rollexx Maintenance

Monthly Cleaning

When your diver cleans the bottom of your boat (about once a month) he will also clean the thruster, mounts and blades. He will also need to know how to care for the zinc mounted in the propeller cone, how to check its integrity and also how to change it when the time comes! You will have to “educate” him!

This Zinc/Propeller Locking Nut Assembly is proprietary to the Rollexx boat stablizer, and is available from us for $65.00. You should keep 1 or 2 in stock for your diver to access when needed. This zinc protects the motor shaft and internals and is a very important maintenance item! Bad things can happen when you don’t maintain this zinc!

Maintenance

Periodically Replace the Zinc in the Propeller Cone

When the zinc has burned down about 1¾″ into the cone recess, it is time to replace it!

To change the zinc, use a 7/8″ box end wrench on the nut and a 3/8″ socket with breaker bar in the set screw in the center of the nut. Hold the nut from rotating with the box end wrench and rotate the allen wrench counter-clockwise a half turn or so to loosen the set screw. Then, while holding the propeller from turning, turn the zinc nut counter-clockwise to unscrew the zinc from the shaft.

To install a new zinc, just reverse the above sequence. Put a little grease on the shaft threads. Tighten Zinc/Propeller Locking Nut to 40-50 ft. lbs. torque and set screw also to 40-50 ft. lbs. torque to lock zinc in place.

Zinc half burned down compared to a new one
Zinc ½ burned down compared to a new one, and measurement of 1¾″ to replace.
measure the zinc’s state of erosion inside of the propeller cone once a month
Your diver must measure the zinc’s state of erosion inside of the propeller cone once a month. When he can measure down 1¾″ inside the cone cavity to the zinc, replace it! There is only ½″ left and you don’t want to ignore this zinc, it’s the life of your motor!
measure the zinc’s state of erosion inside of the propeller cone once a month
We even provide a depth gauge so your diver can see clearly when it's time to change the zinc in the propellor cone! Insert the unpainted end into the cavity to measure degredation of the zinc, when the unpainted surface dissapears, it's time to change the zinc!

When the zinc has burned down about 1¾″ into the cone recess, it is time to replace it!

To change the zinc, use a 7/8″ box end wrench on the nut and a 3/8″ socket with breaker bar in the set screw in the center of the nut. Hold the nut from rotating with the box end wrench and rotate the allen wrench counter-clockwise a half turn or so to loosen the set screw. Then, while holding the propeller from turning, turn the zinc nut counter-clockwise to unscrew the zinc from the shaft.

To install a new zinc, just reverse the above sequence. Put a little grease on the shaft threads. Tighten Zinc/Propeller Locking Nut to 40-50 ft. lbs. torque and set screw also to 40-50 ft. lbs. torque to lock zinc in place.

change the zinc

1

Put a dab of waterproof grease into threads on both ends of the zinc. Then install set screw 2 or 3 threads deep in the 7/8″ nut end.
change the zinc

2

Zinc is now ready to install on propeller shaft with nut and set screw out.
change the zinc

3

The propeller is installed on a splined shaft, then the propeller cone, then a flat washer, then the Zinc/Propeller Locking Nut Assembly.
change the zinc

4

Zinc/Propeller Locking Nut Assembly is now installed on the propeller shaft and tightened snug plus ½ turn or so with a 7/8″ box end wrench to 40-50 ft. lbs. torque.

change the zinc

5

Zinc Propeller Locking Nut Assembly is now held in place with the 7/8 box end wrench while the set screw is tightened with a 5/16 allen / 3/8 drive socket with breaker bar to 40-50 ft. lbs. torque. Very important as this holds the propeller on, too!

Rollexx Stern Thruster
800-772-6165
International: 1+ 661-822-9311

G. Northcutt Corp
20843 Santa Lucia St. #C
Tehachapi, CA 93561
rollexx@boat-stabilizer.com
$19750

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