Two-stage swing-away lattice extension 3.6 Description of rigging work

Locking 9 m (30 ft) section and 12.5 m (41 ft) section

• First insert the securing pin (3) into the bottom bearing point on the right side.

• Then insert the two securing pins (1) and ( 2) into the bearing points on the left side (if necessary derrick the lattice extension to align the bearing points).

• Secure all the pins with retaining pins.

H

Removing locking pins between 9 m (30 ft) section and 12.5 m (41 ft) section on the left side

• Remove the retaining pins and then knock the two pins out of the bearing points (1) and (2) on the left side (if necessary derrick the lattice extension to relieve the load on the pins).

• Then remove the retaining pins and knock the securing pin out of the lower bearing point (2) on the right side.

• Insert all three pins in the keeper plate (1) and secure them with retaining pins.

H

3.6.7 Lowering/raising retaining mandrel on main boom

If the lattice extension is folded on the side of the main boom, the retaining mandrel is inserted on the 12.5 m (41 ft) section in a holder on the main boom.

This connection is both a swinging point for swinging the lattice extension on the run-up rail and a safety device.

Requirements

Before you lower the retaining mandrel,

–the swinging connection must be made between the 12.5 m (41 ft) section and the main boom head; à p.3-48.

–the lattice extension must be secured against swinging around with a cord on the main boom; à Securing lattice extension with cord , p.3-59.

–the locking pin for the 12.5 m (41 ft) section must be inserted in the released position; à Locking pin for 12.5 m (41 ft) section , p.3-58.

Before you raise the retaining mandrel

–the lattice extension must be fully lowered;

–the lattice extension must be fully folded on the main boom.

Two-stage swing-away lattice extension 3.6 Description of rigging work

Locking pin for 12.5 m (41 ft) section

The 12.5 m (41 ft) section is secured with a locking pin on the basic section so that during work with the main boom or when driving the retaining mandrel can not slip upwards out of the holder.

The locking pin (2) is at the front of the basic section where the 12.5 m (41 ft) section is. There are two locking pin positions:

Secured position

• Insert the locking pin (2) in one of the bores (4) so that it is above the stop connection piece (3). Secure the pin with a retaining pin. In this position the 12.5 m (41 ft) section is secured so that it can not slip out upwards.

Released position

• Insert the locking pin (2) in the bore (1) and secure it with a retaining pin. Now the 12.5 m (41 ft) section can be raised for rigging.

Securing lattice extension with cord

If the truck crane is aligned unfavourably the lattice extension may swing round by itself after lowering out of the holder on the main boom.

Secure the lattice extension as follows:

• Attach a cord (2) at the front of the lattice extension.

• Guide the cord underneath the lattice extension, via the holding rod (1) on the main boom and back again.

• Have a helper hold the cord tight whilst you are lowering the lattice extension out of the holder on the main boom.

Lowering/raising the retaining mandrel

HIf you are alone, secure the other end of the cord on the crane (e.g. on the steps of the access ladder leading to the carrier). Leave enough play in the cord that it is tight only when you swing the lattice extension from the runup rail later.

The lattice extension can be derricked from two control units on the lattice extension during rigging; à p.3-75.

GAccidents may occur due to swinging lattice extension!

Always secure the lattice extension against unintentional swinging with a cord before you lower the retaining mandrel out of the holder. This prevents the lattice extension swinging by itself away from the main boom and hitting you from the truck crane if there is an unfavourable alignment of the truck crane.