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Assembly Units
POWER UNIT GROUP
The Power unit group consists of a heavy-duty 20-horse power engine that is coupled to a
triple gear pump. The pump nearest to the engine is an eight GPM(gallon per minute) pump, and
drives all hydraulic cylinder functions (gates, wings, screed extensions, screed lift and tow hitch arms).
The next two pumps drive the left and right augers. These are four GPM pumps each.
If your paver has the electric over hydraulic backup option, this is a four GPM pump driven by
an electric DC motor. This pump will drive all cylinder functions. This pump cannot drive the auger
drive functions. This backup system may be used by actuating the ignition key switch counter-
clockwise, to the electric hydraulic position on the ignition switch.
These pumps are capable of driving all cylinder functions of the machine. The appropriate valve must
be actuated, for the function you are attempting during the stroking motion of the pump.
HOPPER ASSEMBLY
side. The wings are hydraulically operated, which allows the operator to raise and lower them with
ease. The lowering of the wings eliminates any truck/paver interference and also allows easy access
lowering of the wings eliminates any truck/paver interference and also
to the asphalt mix from the side of the paver. This is especially valuable when you need to shovel from
the hopper.
WARNING: Never attempt to remove asphalt mix from an operating
machine. Instruct the truck driver and the paver operator to cease
operation before attempting to remove mix from the hopper.
The hopper gates are hydraulically operated with adequate pressure to close the gates, when
the hopper is full of asphalt. There is a PO check on the gate cylinders that will not allow the gates to
“creep” open when loaded. The gates may be operated independently or as one by adjusting the
valves located on the hopper back, directly above the hydraulic pump cover. The double acting
cylinders on the gates permits trouble free m etering of material on the open and close operations, and
will eliminate excess material clean up at the end of the paved mat.
All JMG Equipment Company tow type asphalt pavers are equipped with manual hand pumps.
The hopper on the PavMaster by Gilcrest tow type pavers is eight feet wide with a wing on each
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