2019 33 D4OPTRS
PICK-UP HEAD
FUNCTION
The pick-up head is the most important assembly on the sweeper. With proper cleaning,
care and adjustment, the unit will perform as it was designed to perform.
Pressurized air from the blower enters the pick-up head through the pressure inlet assembly
where turning vanes distribute it equally across the full width of the pick-up head pressure
chamber. The air then exits the pressure chamber at a very high velocity through a slot
called the Blast Orifi ce. The approximate 45 degree forward pitch of the blast orifi ce results
in debris being dislodged from the sweeping surface and entrained in the swirling left to right
movement of the high speed airstream. After reaching the extreme right side of the pick-up
head, the debris- laden air encounters a suction inlet nozzle where it is drawn up the suction
tube and into the hopper. The turbulent high velocity air is contained beneath the pick-up
head by seal curtains in front and back and skid plates on either side.
NOTE: Any modifi cation or restriction of the blast orifi ce, pressure inlet nozzle,
tube or suction inlet will greatly effect overall performance of the machine.
The raising and lowering of the pick-up head is accomplished hydraulically with the control
valve being actuated by a toggle switch located on the operator’s console inside the truck
cab. When lowered, the pick-up head lift chains have slack so that its weight is suspended
on the four fl otation springs. With the sweeper engine at operating RPM, the springs should
be adjusted so that the pick-up head can be lifted off the ground slightly with one hand and
slid from side to side with ease.
A break-away transition is provided on the suction side of the machine to allow the operator to
check for build up of dirt and debris in the suction hose. A check of the suction and pressure
hose at various times may reveal wear. As areas of wear become evident, rotate the hose
until wear is even on all inside surfaces.
WARNING: Before servicing, stop auxiliary engine and remove ignition
key or disconnect negative battery cable.
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