500E2 OPERATOR MANUAL OPERATING CONTROLS AND PROCEDURES
National Crane Published 07-26-2019 Control # 111-06 3-15
truck cab. This will prevent inadvertent operation of the crane
if the hand control is operated. Protect and monitor the hand
control unit to prevent damage and unplanned operation.
Operation
1. Position crane at job site, set park brake, and shift
transmission to neutral.
2. Start truck from inside truck cab.
3. Engage P.T.O.
4. Set outriggers.
5. Stop truck engine.
6. Connect hand control cord to receptacle on crane. (If
equipped with hard wire remotes).
7. Turn Hydraulic Capacity Alert/RCL and Remotes/SLP
power switches ON - in truck cab.
8. Starting truck for remote operation:
• If truck is equipped with the remote start relay (see
warning before installing start relay), then activate
ignition/start switch on hand control to start truck.
• If truck is not equipped with remote start relay; then
activate ignition/start switch on hand control to the ON
position and start truck with the ignition switch in the
truck cab.
9. Set engine throttle control if not equipped with automatic
throttle advance.
10. Actuate desired crane function switch.
11. Slowly squeeze speed trigger to increase crane
operating speed.
12. Slowly release speed trigger to decrease crane
operating speed.
13. Release crane function switch.
14. Stow crane and shut off hand control ignition/start
switch.
15. Turn Hydraulic Capacity Alert/RCL and Remotes/SLP
power switches OFF - in truck cab.
16. Disconnect hand control and store in truck, (If equipped
with hard wire remotes).
17. Start truck from inside of cab.
18. Stow outriggers.
19. Disengage P.T.O.
Hydraulic System Description
Solenoid Valve Assembly
Flow Control Valve in Inlet Section
1. Electrically controlled priority flow control valve which
can be remotely actuated to control the amount of oil
flow from the inlet to the bypass or the regulated ports.
a. Oil supply of 5 - 18 GPM is pumped to inlet port.
b. With electrical voltage up to 2 volts on the valve coil,
0 GPM of inlet oil is directed to the solenoid valve
sections and the remaining oil goes through the
bypass port and into the manual control valve, then
back to tank.
c. As voltage increases linearly from 2 to 9 volts. there
is a resulting linear increase of oil flow to the
solenoid sections to 18 GPM maximum. Any
remaining oil is directed back to tank through the
bypass port.
Solenoid Valve Sections
2. An electrically actuated directional control valve which
receives oil from the regulated port of the flow control
valve and directs it to the various crane functions.
a. When 12 VDC power is applied to any of the electro-
magnetic coils on the valve, the resulting force
pushes a spring centered spool from its neutral
position to allow oil flow out the work port opposite
the energized coil.
b. Oil flow through the solenoid valve is then increased
and decreased at the flow control valve to get
desired crane operating speeds.
3. Pressure relief valve (part of solenoid valve) in inlet
section.
a. Protects remote control hydraulic circuit from over
pressurization. Must be set to match crane manual
system pressure.
Shuttle Valve
Biased shuttle valves are located in the turn and hoist
functions on units equipped with remote hoist operation.
They block the open oil path through the main control valve
during remote operation.
RADIO REMOTE CONTROLS
The following sections describe the radio remote controls.
For detailed maintenance, installation, and troubleshooting
information about the radio remote controls, see the Service
Manual.
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