Outrigger Beam - Manitowoc Grove RT770E Service Maintenance Manual

UNDERCARRIAGE

Outrigger Beam

Description
The outrigger beam assembly consists of an outrigger beam,
a jack cylinder, an extension cylinder, an Outrigger
Monitoring System (OMS) (Optional—Standard in North
America) string potentiometer, and the required hoses and
mounting hardware.
Theory Of Operation
When the outrigger extension is activated, it extends or
retracts the outrigger beam within the outrigger box. The
outrigger beam can be extended to the mid-extend position
by allowing the lock pin to ride on the top of the beam while
it's extending. The lock pin will automatically drop into the
hole when the beam reaches the mid-extend position.
The Outrigger Monitoring System (OMS) (if equipped) has a
string potentiometer sensor mounted inside each outrigger
box near the fixed end of the extension cylinder. The sensor
is connected to the outrigger beam by a cable to monitor
position of the extension beam—full, half or retracted.
The jack cylinder is mounted to the end of the beam and
applies force to the outrigger beam vertically. This sequence
of events provides for lifting and stabilizing the crane for
operation.
Maintenance
Removal
NOTE: Outrigger removal and installation is similar for
both the front and rear outriggers (Figure 8-29).
1. On the jack cylinder end of the beam, remove the set
screw from the side adjustable wear pad and back off
the wear pad from the outrigger box.
2. Remove the cover from the opposite end of the outrigger
box. Remove the setscrew from the side adjustable wear
pad and back off the wear pad from the beam.
3. Remove the setscrews from the bottom adjustable wear
pads and back off the wear pads leaving approximately
3.2 mm (0.125 in) protruding.
4. Extend the outrigger slightly to facilitate attaching a
lifting device to the outrigger beam.
Be sure any blocking material used is capable of
supporting the weight of the outrigger beam. Do not allow
it to tilt or slide.
5. Place blocking material under the outrigger beam.
8-30
DANGER
Published 11/26/2014, Control # 447-05
6. Tag and disconnect the hydraulic lines at the cylinder
barrel end of the extension cylinder. Cap all lines and
fittings.
NOTE: Do not allow the end of the outrigger extension
cylinder to fall when the cylinder mounting shaft is
removed. Use blocking to limit the drop or an
adequate soft support to cushion any distance the
rod will drop,
7. Remove the OMS string potentiometer cable (if
equipped) from the attaching point on the outrigger
beam.
NOTE: Avoid free-release of cable to prevent damage to
the OMS string potentiometer caused by over-
range of cable.
8. Remove the cotter pin and clevis pin securing the
cylinder barrel end of the extension cylinder to the
outrigger housing. Carefully extend the outrigger beam
until the extension cylinder is free of the housing and
carefully lay the end of the cylinder on the bottom of the
outrigger beam or leave on blocking.
NOTE: Do not allow the end of the outrigger extension
cylinder to fall when the cylinder mounting shaft is
removed. Use blocking to prevent damage to the
OMS (if equipped) string potentiometer.
OMS string potentiometer may be easily removed
to avoid damage during extension cylinder pin
removal. Refer to Outrigger Monitoring System
(Optional—Standard in North America), page 8-34.
NOTE: Lifting belts or straps should be used for lifting
purposes so as to avoid nicking or scratching the
bottom edges of the outrigger beam (Figure 8-30).
9. After attaching a suitable lifting device of straps or belts
instead of chains to prevent nicking the bottom edges of
the outrigger beam, pull the outrigger beam out of the
outrigger box, re-adjusting the lifting attachment to
prevent the extension cylinder from sliding out of the
outrigger beam when the beam clears the outrigger box.
Be sure any blocking material used is capable of
supporting the weight of the outrigger beam. Do not allow
it to tilt or slide.
NOTE: The outrigger
approximately 525 kg (1157 lb).
10. Position the outrigger beam on the blocking material.
RT770E
DANGER
beam assembly weighs