Vevor Long Ram Jack 3T/4T/8T/12T User Manual

Important Information

This manual provides operating and maintenance instructions for the Vevor Long Ram Jack, available in 3T, 4T, 8T, and 12T models. This device is a lift drive designed specifically for use with cranes to lift heavier loads. It is not intended for any other purpose.

Safety Warnings

• Do not overload: Overloading can cause damage to or failure of the unit.
• Support the load: Never work on, under, or around a load until it is properly supported by appropriately rated jack stands.
• Use caution when lowering: Do not drop the load suddenly. Opening and closing the release valve too quickly can create dangerous dynamic shock loads.
• Maintenance: Read and understand all instructions before use. Keep labels and manuals available.
• Environment: Do not use in environments with acid or alkaline corrosive air.

Operation Instructions

To Raise:

1. Estimate the weight of the load and ensure it does not exceed the jack's rated capacity.
2. Place the jack on hard ground. If necessary, use a hard plank under the jack to prevent instability.
3. Insert the notched end of the handle into the release valve and turn clockwise until the valve is closed. Do not overtighten.
4. Insert the handle into the socket and move it up and down to raise the ram.

To Lower:

1. Remove the handle from the socket.
2. Using the slotted opening at the end of the handle, turn the release valve slightly counter-clockwise to loosen it.
3. The piston rod will move down slowly. Do not turn the valve quickly, as this can cause dangerous, rapid lowering.

Maintenance

Adding Oil:

• With the saddle fully lowered and the pump piston fully depressed, set the jack in an upright, level position.
• Remove the oil filler plug.
• Fill until the oil is level with the filler plug hole, then reinstall the plug.

Changing Oil:

• For best performance, replace the fluid at least once per year.
• With the saddle fully lowered and the pump piston fully depressed, remove the oil filler plug.
• Lay the jack on its side and drain the fluid into a suitable container. Dispose of hydraulic fluid in accordance with local regulations.
• Fill with high-quality jack oil and reinstall the plug.

Lubrication:

• Apply a light coating of lubricating oil to pivot points, axles, and hinges to prevent rust.
• Periodically check the pump piston and ram for rust or corrosion. Clean as needed with an oily cloth. Do not use sandpaper or abrasive materials.

Troubleshooting

If the jack fails to load, check that the release valve is tightly closed, ensure there is no overload condition, and check the air supply. If the jack bleeds off after lifting, ensure the release valve is closed and check for hydraulic unit malfunction. If the jack will not lower, check for an overfilled reservoir or binding linkages. For poor lift performance, check the fluid level and ensure there is no air trapped in the system.

Technical Specifications

The jack is available in 3T, 4T, 8T, and 12T capacities. All models feature a 500mm lifting travel. Minimum heights vary by model (660mm for 3T, 8T, 12T; 610mm for 4T).

Installation

The jack is designed to be installed on a crane. Place the hydraulic pump in the jack of the crane and insert the corresponding pin to secure it.