UNDERCARRIAGE TMS700E SERVICE MANUAL
8-66 Published 01-29-2015, Control # 512-01
OUTRIGGER BEAM
Description
The outrigger beam assembly (see Figure 8-65) consists of
an outrigger beam, a 11.43 cm (4.5 in) jack cylinder, a 6.35
cm (2.5 in) outrigger 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 cylinder is activated, it extends or
retracts the outrigger beam within the outrigger box. The jack
cylinder is mounted to the end of the beam. The jack cylinder
applies force to the outrigger beam vertically. This provides
for lifting and stabilizing the crane for operation.
The Outrigger Monitoring System (OMS) string
potentiometer (if equipped) is mounted inside the outrigger
box and is connected to the outrigger beam by a cable. The
string potentiometer identifies whether an extension beam is
at the fully retracted, mid-extend, or fully extended position.
The OMS communicates the horizontal position of each
outrigger beam to the Rated Capacity Limiter (RCL), aiding
the operator in accurately programming the crane’s
configuration.
Maintenance
Removal
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 end cover and the top box 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.
5. Place blocking material under the outrigger beam (see
Figure 8-66).
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
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: 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 8-70.
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.
NOTE: The outrigger beam assembly weighs
approximately 384 kg (847 lb).
10. Position the outrigger beam on the blocking material.
Inspection
Inspect the outrigger beams for bends, evidence of cracks,
or other damage. Check the outrigger beam internally for
hydraulic fluid, which may indicate a leaking cylinder, loose
connection, or damaged hydraulic line.
DANGER
Be sure any blocking material used is capable of
supporting the weight of the outrigger beam. Do not allow
it to tilt or slide.
DANGER
Be sure any blocking material used is capable of
supporting the weight of the outrigger beam. Do not allow
it to tilt or slide.
Reference Only
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