the system.
located in the truck cab, in close
proximity to control switch. Over
4. Hydraulically
actuated
speed engagement protection
implements, such as snowplows,
shall be furnished. PTO shall
which are deployed while the
disengage when pre-set engine
vehicle is moving, shall be
RPM is reached.
furnished with an automatic reset
breakaway mechanism to prevent
7. The
torque
or
horsepower
hydraulic shock if the implement
required of the hydraulic drive
strikes an obstruction while the
PTO shall not exceed the
vehicle is in operation.
maximum torque or horsepower
rating of the PTO opening on the
5. Hydraulic hose fittings shall
transmission or PTO drive pad on
comply with the requirements of
the engine or engine crankshaft.
SAE J516 for permanently
attached (crimped) fittings with
8. All PTO's shall be installed within
JIC 37° flare. Field replaceable
the backlash recommendations of
type fittings are not acceptable.
the PTO manufacturer.
Forged steel hydraulic adapters
B.
Hydraulic system hoses, fittings,
shall be used. Cast steel fittings
pressures, and flow rates.
are not acceptable.
1. Hydraulic hoses shall be rubber
C.
Pressure protection:
covered
double
wire
braid
All hydraulic systems shall be
reinforced and comply with SAE
furnished with either a spring or pilot
100R2, Type A or AT, or 100R9,
actuated pressure relief valve. The
type A or AT, of SAE J517. The
relief valve shall be used for
working pressure of the hose shall
exceed the pressure setting of the
overpressure protection only and
relief valve. Hoses shall be sized
shall not be used for any flow control
such that the maximum velocity of
purpose. In no case shall a relief
hydraulic fluid in the hose does
valve be set at a pressure higher
not exceed the following:
than the working pressure of the
lowest rated component (hose,
a. Fluid velocity in suction lines
coupler, adapter, cylinder, etc.) in
shall not exceed 4 ft. / sec.
the system.
b. Fluid velocity in discharge lines
D.
Flow control valves.
shall not exceed 25 ft. / sec
Flow control valves shall be of a
2. All hoses shall be installed in
type (such as open-center valves)
accordance with the requirements
that assures that hydraulic fluid is
and recommendations of SAE
never deadheaded and forced to
J1273
flow over the relief valve. Flow
3. System working pressures shall
control valves shall be expandable
not exceed 3500 PSI. A system
to control multiple devices, either in
pressure test port shall be
parallel or in series.
Series
provided. The test port shall be
designed systems shall not exceed
located so that the maximum
the maximum working pressure of
pressure produced by the system
any component in the series. Flow
can
be
monitored
without
control valve body shall not be
disconnecting any component of
mounted inside the cab.
Flow
Federal Standard 807M
Page 10 of 65
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