INTRODUCTION 16000 SERVICE/MAINTENANCE MANUAL
1-70
Published 05-03-17, Control # 228-03
Wheel Assemblies
See Figure 1-55 and Figure 1-56.
The wheel assembly swing motors allow the positioning of
the MAX-ER wheels. Before operating any steering switch,
make sure the jacking cylinders are in the correct position for
rotating the wheels. The left side wheel assembly items are
explained in this section, the right side wheel assembly items
operate the same.
The wheel assembly valves have a counterbalance valve at
each motor port. These valves provide smooth operation.
Counterbalance valves also provide relief protection. The
wheel assembly three position spool valves are motor
spooled where both motor ports and the tank port of the
valve spool section are connected in the center position.
The crane accessory system pressure sender monitors the
system pressure to the wheel assembly motors.
Left and right wheel assembly encoders detect the wheel
position and direction of the movement. Node-1 receives this
information as two out-of-phase square wave input voltages
that are converted to counts. The information screen in
operator cab indicates the wheel positions in degrees.
Power is available to the hand-held wireless remote control
when, the engine is running, the MAX-ER function mode is
selected, and the power button is pressed. Wheels cannot
be moved until the electrical cables and hydraulic lines are
connected between the rear of the crane and the telescopic
beam of the MAX-ER.
When operating, the right travel handle can operate the
wheel assembly position when travel is parked and a MAX-
ER chart is selected. Moving the handle forward moves the
wheel assemblies to the straight position. Moving the handle
back moves the wheel assemblies to the swing position. The
right travel wheel assembly operation is similar to the hand-
held wireless remote control operation described next.
Wheel Steering Clockwise
When the left wheel steering switch is moved and held in the
clockwise position, an input signal from the wireless
transmitter is sent to a receiver on the crane. The receiver
sends the input signal to the Node-1 controller. The Node-7
controller sends a 24 volt output to enable the left wheel
assembly solenoid (HS-82) and shifts the valve to rotate the
left side wheels in a clockwise direction.
Node-7 also sends a 24 volt output to enable the left wheel
assembly brake solenoid HS-86 to release the internal
brakes on both left wheel swing shafts. The Node-3
controller also sends a variable 0 to 24 voltage to enable the
proportional relief solenoid HS-68 to provide approximately
310 bar (4,496 psi) pressure to the wheel assembly
Hydraulic pressure from the accessory pump flows through
the pressure control pilot valve, the six bank manifold valve,
and enters the free-flow check valve section of the
counterbalance valve. Fluid pressure turns the motor output
shaft so the wheels rotate in a clockwise direction.
Return hydraulic fluid from the output side of the hydraulic
swing motor flows through the flow control relief valve, the
six bank manifold valve before returning to the crane
hydraulic tank through the return line.
When the wheel position is reached, release the wheel
steering switch. When the switch is released the Node-7
controller sends an input signal to the Node-1 controller. The
Node-1 controller sends a zero volt output to disable the left
wheel brake solenoid HS-87 and apply the internal brakes on
both left wheel swing shafts.
After the brakes are applied, the Node-1 controller also
sends a zero volt output to disable the left wheel assembly
solenoid HS-83, to shift the valve to the center position.
The Node-3 controller sends a zero volt output to the
accessory system proportional relief solenoid HS-68 to
provide approximately 207 bar (3,002 psi) system pressure.
Wheel Steering Counter-Clockwise
When the left wheel steering switch is moved and held in the
counter-clockwise position, an input signal from the wireless
transmitter is sent to a receiver on the crane. The receiver
sends the input signal to the Node-1 controller. The Node-7
controller sends a 24 volt output to enable the left wheel
assembly solenoid HS-83 and shifts the valve to rotate left
side wheels in the counter-clockwise direction.
The Node-3 controller also sends a variable 0 to 24 voltage
to enable the proportional relief solenoid HS-68 to provide
approximately 310 bar (4,496 psi) pressure to the wheel
assembly.
Hydraulic pressure from the accessory pump flows through
the pressure control pilot valve, the six bank manifold valve,
and enters the free-flow check valve section of the
counterbalance valve. Fluid pressure turns the motor output
shaft so the wheels rotate in a clockwise direction.
When the wheel position is reached, release the wheel
steering switch. When the switch is released the Node-7
controller sends an input signal to the Node-1 controller. The
Node-1 controller sends a zero volt output to disable the left
wheel brake solenoid HS-87 and apply the internal brakes on
both left wheel swing shafts.
After the brakes are applied, the Node-1 controller sends a
zero volt output to disable the left wheel assembly solenoid
HS-83, to shift the valve to the center position.
The Node-3 controller sends a variable voltage output to the
accessory system proportional relief solenoid HS-68 to
provide approximately 207 bar (3,002 psi) system pressure.
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