(d) Pressure relief valve to
Each outrigger control shall be
prevent loading beyond
located on the same side of the
lifting capacity.
vehicle as the outrigger. Each
outrigger landing pad shall be
(e) Devices to limit vertical
not less than 900 sq. cm (140
creep of the boom to not
square inches).
more than 25 mm (1 inch)
A hydraulic pump driven from a
per hour.
power takeoff controlled from
(f)
Signs with 25 mm (1 inch)
inside the truck cab shall be
lettering visible to the
provided to furnish power for the
operator at both sets of
crane. The pump shall be of the
controls
reading:
positive displacement type and
OUTRIGGERS MUST BE
shall provide a working pressure
IN PLACE BEFORE LIFT
of
not
less
than
12.4
IS MADE.
megapascals (MPa) (1,800 psi).
Controls shall be of the self-
SAR
SUSPENSION-AIR SPRING-
centering, fail-safe type with
REAR.
hydraulic
bypass
overload
When code SAR is specified, an
valves, and a check valve type
air suspension shall be provided
locking system in boom and
on the rear axles.
The
outriggers to prevent the load
suspension system shall have
dropping due to hydraulic or
not less than 55 percent of the
power failure.
Controls shall
sprung weight carried on the air
have fine metering qualities to
springs.
The air suspension
provide
variable
raising,
system shall incorporate at least
lowering and rotating motions of
two track bars to control lateral
the crane boom. The crane
movement. Each end of the
hydraulic system shall comply
track bars and of the torque
with
the
requirements
in
rods, if so equipped, shall be
paragraph 3.1.1.11 and contain
equipped with rubber bushings
the following minimum safety
that do not require periodic
features:
lubrication.
The suspension
(a) Check valve system in
system shall incorporate leveling
boom and outrigger system
valve(s) with time delay or other
to prevent load drop due to
devices to minimize constant air
hydraulic system failure.
consumption.
On Type II
(b) Flow valve in hydraulic
tractors, the system shall be
lines or cylinder to prevent
equipped with an air pressure
boom damage due to
dump valve. Controls shall be
sudden
load-lowering
located in the cab, accessible to
stops.
the seated driver.
Hydraulic
double-acting shock absorber(s)
(c) Cushioning valves in boom
shall be provided near each of
rotating hydraulic system
the air springs.
The air
for
rack-and-pinion
suspension system shall include
mounted cranes to prevent
mechanisms to prevent damage
damage due to sudden
from excessive extension when
stops.
lifting and towing the vehicle.
Federal Standard 807M
Page 49 of 65
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