Manitowoc GROVE RT890E Operator's Manual page 121

RT890E
Establish an electrical connection between the lattice
extension and anti-two block switch
NOTE: The anti-two block switch supplied with the boom
extension is used for operation of the 33 ft (10.1 m)
and 56 ft (17 m) sections. The junction box
connection for the section that is not in use must be
overridden with a bypass plug.
1. Install the anti-two block switch on the appropriate pin
near the nose sheave of the section being used. Secure
the switch to the boom extension with a retaining pin.
2. Remove the bypass plug and connect the wire for the
anti-two block switch to the junction box located near the
nose sheave.
Disconnect the electrical connection between the
lattice extension and the main boom.
1. Disconnect the boom extension cable from the boom
nose junction box.
2. Wind the cable onto the boom extension for storage.
3. Connect the cable to the dummy plug on the boom
extension adapter.
4. Install the 17 pin bypass plug into the open connector on
the boom nose junction box.
Swingaway Mounting Adjustment.
For the referenced details, refer to the figure titled Removing
and Installing the Swingaway Boom Extension.
1. Set the 29 ft (9 m) section with the 23 ft (7m) section
stowed on the side, on cribbing. Use an adequate lifting
device to place the boom extension at the side of the
SET-UP AND INSTALLATION
boom. Make the connection at the front stowage bracket
and support with lifting device (see detail A).
2. Refer to detail A (front stowage bracket) and pivot the
boom extension on the front support bracket. Adjust the
front support bracket adjustment bolts to maintain a
loose condition when the boom extension anchor fittings
engage the boom anchor lugs.
3. Secure the guide rail on the middle boom extension
stowage bracket in the out position.
4. Swing the boom extension until it contacts the guide rail
at the middle boom extension stowage bracket (see
detail B).
NOTE: When pushing the jib extension onto the guide rail,
make sure contact does not occur at the rear boom
extension mounting bracket and prevent proper
alignment.
5. Adjust the middle stowage bracket so the roller supports
on the 29 ft (9 m) section role on the guide rail and aligns
the roller support on the 23 ft (7m) section. This should
align the hole in the mounting lug on the 23 ft (7m)
section with the hole in the mounting piece on the
stowage bracket. When adjusted properly, the pin can
be inserted to make the stowage connection.
6. Refer to detail C (rear stowage bracket) and adjust the
adjustment bolts on the rear support bracket to support
the boom extension and provide installation of attach
pins.
7. Remove the lifting device used for support when the
boom extension is secured.
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