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•Installation •Operation •Maintenance
Effective 2/21/14
DOCUMENT PART NUMBER 88320
POWER JACK
RV and Marine Applications
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CAUTION
PERSONAL INJURY/PROPERTY DAMAGE
• Retract jack fully before towing.
• Do not use blocks to increase height of jack.
• Use 4000 lb. Heavy Duty Power Jack if you use equalizer bars between the trailer and the tow
vehicle.
INSTALLATION
1. Block tires of trailer and securely support trailer tongue.
2. The Atwood RV Power Jack is designed to attach to the top surface of
an A-frame type tongue having mounting holes typical of the Atwood
A-frame couplers FIG 1. Use coupler installation instructions (MPD
87984) if installing coupler. The Marine Power Jack attaches to the side
of a straight tongue trailer.
3.
A lower support plate must be used for side support of the RV jack on
the lower surface of the A-frame FIG 1.
HOLE DIAMETERS:
Light Weight -
2.02˝
(MIN)
2.09˝
(MAX)
Deluxe / Heavy Duty -
2.20˝
2.28˝
Hole in lower support plate must align with hole in coupler.
TO ORDER LOWER SUPPORT PLATE:
Light Weight -
Atwood MPD 80263
Deluxe / Heavy Duty -
Atwood MPD 80570
Using a 1/8˝ fillet weld, No. E6011 AWS welding rod 1/8˝ diameter,
machine amps (AC or DCRP) at 160-180 with 50 volts, weld plate full
length on each side to underside of A-frame. The maximum frame
height is 6 inches.
4. Place RV jack through holes in coupler and lower support plate, FIG 1-A.
Attach with three (3) bolts (3/8˝ dia. x 5/8˝ long, grade 5, FIG 1-B. NOTE:
Torque bolts to 15 foot lbs. minimum /20 foot lbs. max.
Note: There must be metal to metal contact between jack and coupler. The three mounting
bolts with attached star washers must be used. The star washers are designed to remove
paint on the surface of jack flange. The bolts also should remove paint from the mounting
holes in coupler. If a grounding problem occurs (i.e. no power) check these two surfaces to
be sure there is metal to metal contact between jack and coupler. For wiring, see
WIRING
ILLUSTRATIONS
FIG
2 & 3.
5. Attach jack as shown.
6. Route wire lead from motor along trailer tongue to battery. Secure lead
to jack housing and trailer frame using cable ties or equivalent.
7. Remove fuse from fuse holder. Connect the wire lead from the jack
directly to the positive (+) terminal of the battery. Replace the fuse into
the fuse holder. For auxiliary battery, connect lead to auxiliary battery
positive (+) terminal so that jack may be used when connected to 115v.
For additional wire, use #10 stranded copper wire or larger.
8. After reinstalling fuse, check installation by pressing switch marked “EXT”
for jack extension or “RET” to retract the jack.
9. On all power jacks, check utility light by moving switch to “ON” or “OFF”.
10. The Power Jack may come packaged with the Atwood Robofoot.
Instructions for installation, operation and maintenance of the Atwood
Robofoot are included with the Robofoot. The Robofoot should be
installed after the jack is securely attached to the coupler.
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CAUTION
HAND OR FINGER INJURY
• Hold Robofoot below the clevis pin parts when installing. This is a moving part and is a potential
pinch point.
SAFETY ALERT SYMBOLS
Safety Symbols alerting you to potential personal safety hazards.
Obey all safety messages following these symbols.
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WARNING
avoid possible
injury or death
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CAUTION
avoid possible
injury or death
FOR YOUR SAFETY READ ALL INSTRUCTIONS
BEFORE INSTALLATION AND OPERATION
Installer:
Provide these instructions to the consumer.
Consumer:
Keep documents for future reference.
The Atwood Power Jack is a 12-volt DC motor driven screw jack intended for use
on recreational type and marine trailers. Patent # D349800. Jack is used to level
trailer or raise and lower coupler for hookup to tow vehicle.
deluxe
heavy
duty
marine
Max. Lifting Cap.
lbs
3000 4000 1000
OPERATION
1.
To raise or lower jack, press switch marked “EXT” or “RET”. “Extend” and “Retract”
refer to the jack, not the trailer.
2.
Release switch when jack nears full retraction or full extension to prevent
unnecessary wear on motor clutch.
a. When jack reaches its maximum extended or retracted length or maximum
load, a clicking noise will be heard. This is the overriding clutch built into the
motor to prevent overload.
Release switch immediately when clicking is heard. If the jack has been over
extended or retracted, it may bind. If so, operate with the manual override
handle, per STEP 3 below, to release it from the bind.
b. When the heavy duty power jack is being retracted, there may be some
audible noise, coming from the brake area. This is normal and is due to the
high load for which this jack is rated.
3.
In case of electrical failure- raise or lower jack as follows:
MANUAL OPERATION FOR ALL VALUE & PERFORMANCE POWER JACKS
a. Attach the Drill Crank adapter part #85385 to a powered drill. An optional
manual drive handle, part # 87891 (not included) (FIG 1-C) can also be used to
manually raise and lower the jack
b. Insert the included Drill Crank Adapter into the manual override access port
to engage manual override pin.
c. Activate drill or rotate handle (if using the manual drive handle) clockwise to
raise the jack and counter clockwise to lower the jack.
MAINTENANCE
1.
Before each use, inspect jack tubes and replace if bent or damaged.
2.
If wiring is connected to battery terminal, inspect at least twice each year for
corrosion. Clean with a solution of baking soda and water, and then apply a
thin coat of grease. NOTE: The motor ground screw (FIG 1-D) and mounting
bolts (FIG 1-B) must be cleaned too if a ground continuity problem occurs.
3.
Once each year, extend jack as far as possible and clean inner ram tube.
Coat tube with light coat of silicone spray lubricant. The Electric Drive
Motor Landing Leg system is protected by a 30 amp fuse. If replacement is
necessary, replace only with a Buss Type AGC-30 fuse or equivalent, available
in automotive supply stores.
4.
The Robofoot does not need to be lubricated or modified after installation.
