Stromberg Carlson Products JET-4500 User manual

StrombergCarlson.com • 231.947.8600
1. Park the trailer on a level surface and block the wheels.
2. Support the trailer tongue by the frame with the jack stands.
3. Remove the paint tab
masking one of the three
mounting holes on the
jack. Also, sand paint
from the area around the
mounting holes on the
jack mounting plate (both
top and bottom) and the
corresponding location on the trailer coupler. Lubricate these
bare metal connection points with dielectric grease to ensure
the best ground possible for the jack and to prevent rust.
4. Insert the electric jack into the jack hole, aligning the bolt
holes so the motor housing is facing forward (Figure 1).
Secure the jack using the mounting bolts and star washers
provided. If mounting holes on the coupler are too large for
the bolts to thread into, use grade 5, 3/8”-16 UNC bolts and
washers. Bolts should be tightened to 15 to 20 ft-lb.
WARNING: Keep hands, feet, and body out from beneath
the jack and trailer to avoid risk of harm or fatal injury!
Before installation, compare the lift capacity of the
Stromberg tongue jack with your trailer to ensure safe
operation of the jack.
INS-JET4500-C 04.27.2021
Electric Tongue Jack JET-4500
Tools Required
9/16” Wrench
Torque Wrench
Wire Cutters/Strippers
Crimpers OR Soldering Iron
Carton Contents
(1) Removable Foot Pad
(1) 3/8” Safety Lock Pin
(1) Manual Crank Handle
(1) 30 A Spare Fuse
(3) 3/8” Star Washers
(3) Bolts
(1) Wire Butt Connector
(1) Terminal ring
FIGURE 2
5. If a lower support plate is not already present, install one
in the bottom of the trailer frame. Do not operate the jack
without a lower support plate – shown in Figure 2.
6. Connect the fuse holder to the power wire using the
butt connector and terminal ring; crimp or solder the
connections. Place the fuse holder as close as possible to
the positive battery terminal – preferably inside the battery
box. Since the jack is internally grounded, a ground wire is
not necessary. Attach the power wire to the positive battery
terminal.
7. Alternately, wire the jack
directly to the reset breaker
(if available). The reset
breaker may be located at
the corner of the first cross
member of the A-frame.
FIGURE 1
Specifications
n4500 lb Electric A-Frame Jack
nMaximum Lift Capacity:
4500 lb (continuous use)
nRetracted Height: 31-3/8”
nVertical Travel: 18”
nPower Requirements: 12V DC
nOuter Tube Diameter: 2-1/4”
nPower Cord Length:
6 ft of 10 Gauge Wire
nFoot Pad Diameter: 5-1/2”
nLED Work Lights For Easy
Nighttime Hookups
nShipping Weight: 28 lb

Electric Tongue Jack JET-4500
Operation Instructions
1. Park your trailer on a level surface and block all dolly and
trailer wheels. TIP: For night time hookups, flip the light
switch ON to illuminate your work area.
2. Before operating the jack, attach the foot with the 3/8”
safety lock pin provided.
WARNING: DO NOT stack blocks under the jack’s foot to
increase the height. Stacked blocks may become unstable
and fall.
3. Extend the jack by pushing the operating switch UP. NOTE:
Under heavy use, the circuit breaker may open, causing the
motor to switch off. In this case, release the operating switch
and wait 15 seconds for the breaker to reset. Retract the jack
by pushing the operating switch down. NOTE: The jack will
slow down and stop as it approaches the fully retracted
position. Release the switch at first sign of slowing.
4. Before driving, remove the foot or position it in the highest
position and completely retract the jack.
Manual Operation Instructions
1. Disconnect the jack from the power source. (Failure to do so
could result in serious injury.)
2. Remove the rubber access covers on the top of the jack and
on the side of the motor cover. (Figure 3)
3. Insert the manual crank handle into the access hole on the
top of the jack, engaging the drive screw.
4. Holding the crank in place, install the brake release handle
onto the brake lever and pull forward to release the brake.
WARNING: Always hold the crank handle firmly in place before
releasing the brake on a loaded jack. Failure to do so will allow
the jack to retract freely and the handle could spin dangerously
when the brake is released.
5. Rotate the manual crank handle counter-clockwise to extend
the jack, and clockwise to retract it.
6. When the jack has reached the desired height, re-engage
the brake then remove the crank and brake release handles.
Replace rubber access covers.
TROUBLESHOOTING
Motor isn’t operating
CAUSE SOLUTION
Open Circuit Breaker Wait 15 seconds for the breaker to close.
Poor Ground Clean area between the jack mounting
plate and coupler, and ensure paint
has been removed by the star washers.
Direct metal-to-metal contact must exist
between mounting components to ensure
good electrical contact.
No or Low Voltage Check battery and electrical connections.
Power supplied must be at least 10V DC.
If the battery is low, plug the trailer cable
into the tow vehicle, and start the tow
vehicle to provide power to the jack.
Blown Fuse Replace fuse with a new 30A fuse.
Crank handle won’t turn during manual operation
CAUSE SOLUTION
Engaged Brake Disengage the brake by installing the
brake release handle on the brake lever
and pulling forward.
Replacement Parts
Operating switch,
Extend/Retract
Operating switch,
Light –on/off
Led light
Circuit board
Motor and brake
Rubber cap
Brake handle
3/8” safety lock pin
Removable foot pad
Mounting Bolts (3 pcs)
Star washer (3 pcs)
Limited Gear Box
Wire butt connector
30A spare fuse
Terminal ring
30A spare fuse
Manual crank handle
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Maintenance
To keep your jack in good, functional condition, fully extend the
jack and clean the inner jack tube once a year. After cleaning,
coat the tube with a light grease or silicone spray lubricant.
FIGURE 3
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