This document describes the VEVOR Electric Trailer Jack, model EJ3550B, a robust tool designed to assist with the vertical movement and leveling of trailers. The jack is part of VEVOR's "Tough Tools, Half Price" line, emphasizing affordability without compromising utility. It is intended for use on flat, level, hard surfaces capable of supporting the load and is specifically designed for vertical movement of the trailer, not for lifting the trailer for service or tire changes.

Function Description

The VEVOR Electric Trailer Jack is primarily used for raising and lowering trailers, facilitating coupling and uncoupling from a tow vehicle, and leveling the trailer when parked. It operates on a DC 12V power supply, typically from the trailer's battery or the tow vehicle's electrical system. The jack features an electric motor that drives a screw mechanism to extend or retract the inner tube, providing smooth and controlled vertical movement. It includes a footplate at the bottom for stable ground contact and a drop leg feature for additional height adjustment, which should only be adjusted when there is no load on the jack.

The jack is equipped with a top cover that houses the lift switch and a light switch, which controls an LED lamp for illumination during operation, especially in low-light conditions. A fuse is integrated into the system for electrical protection. For manual operation in case of power failure or other issues, the top cover can be removed to access a mechanism for manual cranking using a hand rocker. The jack is designed for A-frame mounting, making it suitable for a wide range of trailers with this type of coupler.

Usage Features

Operating the VEVOR Electric Trailer Jack involves a straightforward process, but adherence to safety instructions is paramount. Before installation, it is recommended to hook up the trailer to a tow vehicle to ensure stability. The jack mounts through a hole on top of the A-frame coupler, with its mounting plate aligning with three slotted holes on the coupler. It is then secured with three bolts and nuts (sold separately), which should be regularly checked for tightness. After mounting, the handle assembly (hand rocker) can be attached with a bolt fastener.

Electrical connection is critical for operation. The red wire from the jack must be connected to the positive terminal of a DC12V battery, and the black wire to the negative terminal. It's essential to ensure the battery has at least 10 VDC; if low, the trailer cable should be plugged into the tow vehicle, and the tow vehicle started to provide power. Proper grounding is also vital, requiring a clean area between the jack mounting plate and coupler, with any paint removed to ensure direct metal-to-metal contact.

Once connected, the jack's functions can be tested using the lift switch for up and down movement and the light switch for the LED lamp. The footplate should be installed after lifting the jack to an appropriate height and then lowered onto a hard floor or pad. Users are warned against exerting excessive side forces on the jack, exceeding its load capacity, or moving the trailer before the jack is fully retracted. Children and bystanders should be kept away from the work area during operation. The jack should not be used in environments with flammable liquids, gases, or dust, as it can create sparks. When using the drop foot or drop leg, the supplied pin must be fully inserted through both sides of the inner tube and the drop tube before use. Rapid and continuous lifting is discouraged to prevent gear heating and extend service life.

Maintenance Features

Maintaining the VEVOR Electric Trailer Jack ensures its longevity and optimal performance. Regular cleaning with mild soap and water, along with light oil lubrication of pivot points, is recommended to preserve its appearance and functionality. Periodically checking for loose screws is also important. Before each use, the jack tubes should be inspected for any bends or damage and replaced if necessary.

For wiring connected to the battery terminal, inspection for corrosion should be performed at least twice a year. Any corrosion should be cleaned with a solution of baking soda and water, followed by the application of a thin coat of grease. The motor's ground screw and mounting bolts must be cleaned if a grounding continuity problem arises.

The maintenance schedule is divided into intervals:

Daily before operating: Inspect jack tubes for damage, ensure all connections are tight and free of corrosion, and verify proper grounding (metal-to-metal contact with the coupler). If necessary, wash with mild soap and water, rinse thoroughly, and clean the motor ground screw and mounting bolts if a grounding continuity problem occurs. The powered A-frame jack motor is sealed and maintenance-free.
After the first 20 operating hours: Fully extend the jack and clean the inner jack tube.
After the first 50 operating hours or every week: Fully extend the jack and clean the inner jack tube.
Every year: Fully extend the jack and clean the inner jack tube once per year. After cleaning, coat the tube with a light grease or silicone spray lubricant.

Troubleshooting common issues includes checking battery and electrical connections for low voltage (minimum 10 VDC), ensuring proper grounding by cleaning contact areas, and securing loose wire connections. If the motor fails to operate, a faulty ON/OFF switch or motor may need replacement. If the light doesn't work, loose wires on the ON/OFF switch or a bad light bulb could be the cause, requiring secure connections or bulb replacement. Following these maintenance guidelines will help ensure the jack remains in good working order.

VEVOR EJ3550B - Foot Plate Usage and Manual Override

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