1. HYDRAULIC MOBILE CRANE
&
TOWER CRANE

2. HYDRAULIC MOBILE CRANE
• Basic Equipment
• Some basic equipment on
a hydraulic truck crane:
– Boom - The large arm mainly responsible
for lifting
– Counterweights - Multi-ton weights
placed on the back of the cab to prevent
the crane from tipping during lifts
– Two-gear pump - Hydraulic pump
system that uses two rotating gears to
pressurize oil
– Jib - Lattice structure that extends out of
the boom
– Outriggers - Supports that keep the
crane balanced
– Rotex gear - Large gear under the cab
that allows the boom to be rotated
– Load Moment Indicator - Array of lights
located in the cab just above the
operator's eye level; flashes if crane's
lifting limits are reached

3. HYDRAULIC MOBILE CRANE
• The large metal ball attached to
the hook keeps the cable taut
when there is no load on the
hook.
• The large metal ball attached to
the hook keeps the cable taut
when there is no load on the hook.
• If the operator tries to lift a load
too high, the Load Moment
Indicator will light up.

4. HYDRAULIC MOBILE CRANE
• The outriggers • The outriggers keep
keep the crane the crane balanced
during a lift. The inset
balanced during a shows all outriggers
lift. The inset
extended
shows all
outriggers
extended

5. TOWER CRANE
• Parts :
– Base
– Slewing Unit
• Jib / Working
Arm
• Machinery
Arm and
Counterweig
ht
• Operator
Cab.
– Mast / Tower

6. TOWER CRANE
• The long horizontal jib (or • The shorter horizontal
working arm), which is the
portion of the crane that machinery arm, which
carries the load. A trolley contains the crane's
runs along the jib to move motors and electronics as
the load in and out from the
well as the large concrete
crane's center counter weights

7. TOWER CRANE
• The operator's cab: • The machinery arm contains the motor that
lifts the load, along with the control
electronics that drive it and the cable drum,
as shown above :
• The motors that drive the
slewing unit are located above
the unit's large gear.

8. TOWER CRANE
• Spesification :
– Maximum unsupported height - 265 feet (80
meters)
The crane can have a total height much
greater than 265 feet if it is tied into the
building as the building rises around the
crane.
– Maximum reach - 230 feet (70 meters)
– Maximum lifting power - 19.8 tons (18
metric tons), 300 tonne-meters (metric ton =
tonne)
– Counterweights - 20 tons (16.3 metric tons)

9. TOWER CRANE
• The first element of the tower crane's stability is a large concrete
pad that the construction company pours several weeks before the
crane arrives. This pad typically measures 30 feet by 30 feet by 4
feet (10 x 10 x 1.3 meters) and weighs 400,000 pounds (182,000
kg) -- these are the pad measurements for the crane shown here.
Large anchor bolts embedded deep into this pad support the base
of the crane. So they can’t fall over even without support of wire.

10. TOWER CRANE – ERECTION & CLIMBING
(1) (2)
(3)

11. TOWER CRANE – ERECTION & CLIMBING