VanBelkumHelp VB4-MST Security Trailer

Raise the mast

The mast is the one part of the trailer that can hurt someone. Every step here exists because of that.

Line drawing of the trailer leveled on its outriggers with the panels out and the mast partly raised
Leveled, outriggers out, panels out. Only now does the mast go up.

Before you raise

  1. Confirm the trailer is level and all four outriggers are extended. See Set up on site.
  2. Check that the camera head and any speaker or strobes at the top are mounted and aimed the way you want them. Adjusting them is much easier at ground level.
  3. Inspect the mast ropes for wear or damage, and make sure each rope sits centered in its pulley.
  4. Inspect the mast electrical cord for cuts or worn insulation.

Do not raise the mast if the cord’s insulation is cut or worn through. Bare wire touching the mast or frame can energize the trailer and electrocute you. Repair or replace the cord first.

Raise it

Two line drawings: the winch drum with the rope wound neatly, and the mast locking pin
A: rope wound neatly and tight on the drum. B: the locking pin at full height.
  1. Look at the winch. The steel rope must be wound neatly and under tension (A). Slack rope wears, frays, and can break.
  2. Hold the mast UP button on the controller in the cabinet. The mast rises in sections; watch that the electrical cord pays out from the top sections without snagging.
  3. At full height a limit switch cuts the winch power automatically. Insert the safety locking pin (B) through the mast.
  4. If your trailer has a hand-crank winch instead, crank clockwise to raise, and fit the same locking pin at the top.
Line drawing of the trailer with the mast fully extended
Fully extended and pinned.

If the rope goes slack or a mast section sticks at any point, stop immediately and call VanBelkum Support. Do not try to free it under load.

Never touch the neutral gear bolt with the mast up

Line drawing of the electric winch with its neutral gear bolt marked with a red X

The electric winch has a neutral gear bolt that frees the drum. With the mast extended, operating that bolt drops the mast. It can destroy the equipment and kill someone underneath. Leave it alone unless the mast is fully lowered.

Once it is up

  • Keep the safety pin in and the outriggers extended the entire time the mast is up.
  • Lower the mast before high winds or an electrical storm, and whenever the trailer will sit unattended through severe weather.
  • Never move the trailer, even a few feet, with the mast raised.