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Bob's Machine Shop - Frequently Asked Questions
Frequently Asked Questions
Hydraulic Jack Plates
Q: Can I use a jack plate to lower my motor? A: No. No jack plate can lower your motor. If a jack plate
was to lower your motor your steering might not have the ability to
fully turn port to starboard and you tilt & trim angles will
not have a full range of motion without interference. Your cowling
and control cables will hit your transom. If you need to lower your
motor, please look into a shaft extension kit from us.
Q: What kind of fluid is in my jack plate’s hydraulic pump?
A: Your jack plate’s hydraulic pump takes 20 weight (20w-20)
non-detergent motor oil or a light weight hydraulic oil.
Q: What kind of grease do I use to properly maintain my jack
A: Use waterproof marine grade grease, do not
Q: What horse power motors can you hydraulic jack plates handle?
A: Our 6 inch lightweight, 4 inch Ultra HD, 8 inch, and our 10 inch
Max jack can handle up to 300 horsepower. Our 4 inch Ultra light can
handle motors up to 115 horsepower.
Q: How do I determine the correct set back for my boat? A:
For motors 40 horsepower to 115 we recommend the 4 inch ultra light.
Our 6 inch jack plate is a good choice for most flats and bay boats.
Our 4 inch heavy duty is good for boats with heavy 4 strokes, the
Verado or for applications where the motor should be close to the
transom. 8 and 10 inch jack plates are a good choice for bass boats
or for boats that require more bow lift. It is always a good idea
to ask your boat’s manufacturer which set back they recommend for
your model boat.
Q: Does the jack plate come with everything I need to install it
on my boat?
A: The jack plate comes with the hydraulic pump
assembly, wiring harness, 7 feet of hydraulic hose, the control
switch, and 2 quarts of hydraulic oil. You might want to consider
the optional bolt kit to bolt your motor to the jack plate and the
jack plate to the transom.
Q: Do I need the lift gauge?
A: No, the lift gauge is an
option. The gauge will let you know what the vertical height is. It
is accurate up to a 1/4 of an inch.
Q: Why do you recommend a water pressure gauge with a jack
A: We recommend a water pressure gauge on every boat with
or with out a jack plate. A water pressure gauge monitors your water
pressure to assure that you are getting adequate water pressure to
Q: What are the benefits of installing a jack plate?
Installing a jack plate will help to improve your speed and
performance, reduce your fuel consumption and allow you access to
Q: What is the difference between your jack plate and other jack
plates on the market? A: Our jack plate is the lightest, the
fastest, and the strongest on the market. Our jack plate is the only
one with a life time warranty.
Q: How much weight does the jack plate add to my transom?
Ultra light weighs 29 pounds, HD4 weighs 36 pounds, light weight 6
inch weighs 37 pounds, 10 inch max jack weighs 42 pounds.
Q: How fast can your jack plate lift my motor?
A: Our jack
plate will lift your engine a minimum of 7 ½ inches in around 8
seconds while under full power.
Manual Jack Plates
Q: How much does your manual jack plate weight?
A: The 4 in 1
convertible manual jack weights 19 pounds
Q: Does installing a nose cone or low water pick up void my
A: We recommend that you contact your boat
dealer to find out. Warranties differ dealer to dealer.
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Bob's Machine Shop, RSM International, Inc
Order line only: 1-800-966-3493 Tech line: (813) 247-7040
Fax: (813) 247-7041
Office hours 8:00 AM to 5:00PM EST Monday through Friday
** Bob's Machine Shop, Division of RSM International, Inc.**