Manitowoc Published 05-03-17, Control # 228-03 1-31
16000 SERVICE/MAINTENANCE MANUAL INTRODUCTION
position restricts the returning fluid flow. The pressure builds
on the fluid return side of the closed-loop, acting as a
hydraulic brake to control the lowering speed.
When the control handle is moved toward the neutral
position, the Node-3 controller sends an output voltage to the
pump EDC that moves the swashplate toward the center
position. This shifts the motors back to the maximum
displacement for slower output speed to slow the drum
rotation.
When the control handle is moved to the neutral position,
The Node-1 controller stores the load holding pressure in the
pressure memory. After the control handle center switch
opens, the Node-4 controller sends a zero output to disable
the brake release solenoid HS-10. The drum brake valve
shifts to block the pilot pressure to the brake and opens a line
to the tank. When the brake applies, an input signal is sent to
the Node-1 controller. The Node-4 controller sends a zero
volt output to the boom pump EDC to de-stroke the pump.
The Node-4 and 5 controllers send a zero volt output to each
motor PCP.
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