become unstable. Vehicle shall
to prevent load drop due to
be deemed unstable when any
hydraulic system failure.
one of the vehicle wheels lifts off
(b) Flow valve in hydraulic
the ground. The boom, when
lines or cylinder to prevent
fully extended, shall have a
boom damage due to
normal lifting range of 7600 mm
sudden
load-lowering
(25 feet) above ground level and
stops.
shall fold to a travel height,
(c) Cushioning valves in boom
between the stake body and the
rotating hydraulic system
truck cab, not more than 2130
for
rack-and-pinion
mm (84 inches) above the truck
mounted cranes to prevent
chassis frame. Crane controls
damage due to sudden
shall be provided on each side
stops.
of the vehicle.
Crane and
outrigger controls shall be
(d) Pressure relief valve to
accessible from ground level.
prevent loading beyond
Each outrigger control shall be
lifting capacity.
located on the same side of the
(e) Devices to limit vertical
vehicle as the outrigger. Each
creep of the boom to not
outrigger landing pad shall be
more than 25 mm (1 inch)
not less than 900 sq. cm (140
per hour.
square inches).
A hydraulic pump driven from a
(f)
Signs with 25 mm (1 inch)
power takeoff controlled from
lettering visible to the
inside the truck cab shall be
operator at both sets of
provided to furnish power for the
controls
reading:
crane. The pump shall be of the
OUTRIGGERS MUST BE
positive displacement type and
IN PLACE BEFORE LIFT
shall provide a working pressure
IS MADE.
of
not
less
than
12.4
megapascals (MPa) (1,800 psi).
SAR
SUSPENSION-AIR SPRING-
REAR.
Controls shall be of the self-
When code SAR is specified, an
centering, fail-safe type with
air suspension shall be provided
hydraulic
bypass
overload
on the rear axle for class E, F
valves, and a check valve type
and G vehicles. The suspension
locking system in boom and
system shall have not less than
outriggers to prevent the load
55 percent of the sprung weight
dropping due to hydraulic or
carried on the air springs. The
power failure.
Controls shall
air suspension system shall
have fine metering qualities to
incorporate at least one track
provide
variable
raising,
bar to control lateral movement.
lowering and rotating motions of
Each end of the track bar(s) and
the crane boom. The crane
of the torque rod(s), if so
hydraulic system shall comply
equipped, shall be equipped
with
the
requirements
in
with rubber bushings that do not
paragraph 3.1.1.10 and contain
require periodic lubrication. The
the following minimum safety
suspension
system
shall
features:
incorporate leveling valve(s) with
(a) Check valve system in
time delay or other devices to
boom and outrigger system
minimize
constant
air
Page 60 of 79
to verify that this 7 4Y
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