a. Fluid velocity in suction lines
requirement of the hydraulic
shall not exceed 4 ft. / sec.
system.
The minimum PTO
horsepower rating shall be
b. Fluid velocity in discharge lines
calculated by the following
shall not exceed 25 ft. / sec
formula:
2. All hoses shall be installed in
PV ×1.50
accordance with the requirements
= Minimum PTO HP Rating
1714 × .85
and recommendations of SAE
J1273
Where P = max working pressure in
PSI and V = max flow in GPM
3. System working pressures shall
not exceed 3500 PSI. A system
6. PTO's shall be of the power shift
pressure test port shall be
design. PTO shift controls shall
provided. The test port shall be
be
electric-over-hydraulic
for
located so that the maximum
automatic transmissions, manual
pressure produced by the system
transmissions shall have electric
can
be
monitored
without
shift controls for hydraulic braked
disconnecting any component of
chassis and air shift controls for
the system.
air braked chassis. There shall be
a PTO engagement indicator
4. Hydraulically
actuated
located in the truck cab, in close
implements, such as snowplows,
proximity to control switch. Over
which are deployed while the
speed engagement protection
vehicle is moving, shall be
shall be furnished. PTO shall
furnished with an automatic reset
disengage when pre-set engine
breakaway mechanism to prevent
RPM is reached.
hydraulic shock if the implement
strikes an obstruction while the
7. The
torque
or
horsepower
vehicle is in operation.
required of the hydraulic drive
PTO shall not exceed the
5. Hydraulic hose fittings shall
maximum torque or horsepower
comply with the requirements of
rating of the PTO opening on the
SAE J516 for permanently
transmission or PTO drive pad on
attached (crimped) fittings with
the engine or engine crankshaft.
JIC 37° flare. Field replaceable
type fittings are not acceptable.
8. All PTO's shall be installed within
Forged steel hydraulic adapters
the backlash recommendations of
shall be used. Cast steel fittings
the PTO manufacturer.
are not acceptable.
B.
Hydraulic system hoses, fittings,
C.
Pressure protection:
pressures, and flow rates.
All hydraulic systems shall be
1. Hydraulic hoses shall be rubber
furnished with either a spring or pilot
covered
double
wire
braid
actuated pressure relief valve. The
reinforced and comply with SAE
relief valve shall be used for
100R2, Type A or AT, or 100R9,
overpressure protection only and
type A or AT, of SAE J517. The
shall not be used for any flow control
working pressure of the hose shall
purpose. In no case shall a relief
exceed the pressure setting of the
valve be set at a pressure higher
relief valve. Hoses shall be sized
than the working pressure of the
such that the maximum velocity of
lowest rated component (hose,
hydraulic fluid in the hose does
coupler, adapter, cylinder, etc.) in
not exceed the following:
the system.
Page 10 of 79
to verify that this 7 4Y
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business