AC Hydraulic WJN Series Workshop Cranes

Safety Instructions

WARNING: Read, understand, and follow all instructions before operating this crane.

• Do not exceed the rated capacity.
• Only use slings and chains with a capacity greater than the load.
• Ensure the load cannot slide or swing during transport.
• It is forbidden to stay under a suspended load.
• Legs and extension jib must always be secured with studs and safety pins.
• Use only on a hard, level surface.
• Lower the load to the lowest position before transporting.
• No alterations shall be made to this crane.
• Failure to follow these warnings may result in personal injury and/or property damage.

Assembly

1. Lower legs (15/22 + 14/21) and lock them with spikes (23/25) and safety pins. On WJN5/10-EUR models, the legs must also be fitted with screws (8), tightened to a torque of 12 Nm.
2. Grease the pump piston thrust pad (43), oil the handle axle (41) and the main jib axle (18).

Operation

Lifting: Activate the pump handle using full strokes.

Lowering: Slowly turn the release handle counter-clockwise. The spring in the release handle causes it to close automatically.

The legs can be turned upright for storage by removing the spikes (23/25). Use the spikes and safety pins to secure the legs again when stored.

The extension jib can be adjusted to different positions by removing the spike (22/24). Remember to secure the jib again with the spike and safety pin.

Maintenance

Maintenance and repair must always be carried out by qualified personnel.

• Daily: Inspect the crane for damage.
• Monthly: Grease the pump piston thrust pad (43), and oil the handle axle (41) and main jib axle (18). Also inspect the crane for unusual wear and tear.

Oil Refill: Refill through the filling hole in the cylinder using an oil can. The correct oil level is up to the lower edge of the filling hole (26) with the jib fully down. Too much oil causes poor pumping.

Quantity of Oil: 0.7 L. Any good hydraulic oil with a viscosity of ISO VG 15 can be used. NEVER USE BRAKE FLUID!

Safety Inspection

In accordance with national legislation – minimum once a year – the crane must be inspected by a professional: damages, wear and tear, safety catch on the hook, adjustment of the safety valve, hydraulic unit for leakages. Furthermore, all safety labels must be legible.

Troubleshooting

1. The crane does not lift to maximum position but the pump retains pressure: refill with oil.
2. Poor pumping (half strokes): vacuum in the reservoir. Loosen the filling plug (26) and verify oil level.
3. The load is dropping: verify the release handle is closed and the release spring (dead man's control) is properly adjusted. Pre-tension of the spring (37) is max. half a turn. If this is not the cause, then the pump needs repair (worn seals or valves).

Spare Parts

Replace worn or broken parts with original spare parts only. All major parts may not be available after discontinuation of a model.

Destruction

Oil must be drained off and legally disposed of.

Parts List

Refer to the diagrams for part identification.

Hydraulic Diagram

A hydraulic diagram is provided for reference.

Declaration of Conformity

The product conforms to relevant EU and UK directives and regulations.