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ransmission
he roller has an open loop h ydraulic transmission based around a variable displacement
pump mounted to the engine.
his pump supplies a variable flow of oil to fixed displacement drive motors that turn the
roller drums, hence the roller has infinitely variable travel speed up to a maximum in either
direction.
Vibration
he roller has a hydrostatic vibration system to enable greater compaction force to be exerted
onto the ground than just the operating weight of the machine.
he system uses a fixed displacement gear pump mounted onto the engine that supplies a set
flow-rate of oil to drive two fixed displacement gear motors. hese motors are used to turn an
eccentric weight at high speed inside each roller drum, thus creating vibration.
A solenoid valve is used to energize the vibration system. his valve directs the oil flow from
the gear pump through the front vibration motor, the rear vibration motor and back to tank.
Water Sprinkler System
he WP6100 is equipped with gravity water sprinkler systems. A pressurized sprinkler system
is an optional addition. Both systems spray the roller drums with water to prevent the
compacted surface from being picked up on the drums.
Hydraulics
he hydraulic system provides power to operate the roller transmission, steering and
vibration systems.
Drive
he roller drive system comprises a variable displacement transmission pump close coupled
to the engine. his pump has a variable output that is controlled by the Operator via a push-
pull cable and lever.
he pump supplies its flow of hydraulic oil to the two fixed displacement drive motors, one
mounted to each of the two drums. By moving the directional lever, the operator actuates
the transmission pump and controls the hydraulic oil flow rate and direction.
he roller is thereby driven via the drums in the selected direction at the required speed.
Steer and Vibration System
wo fixed displacement gear pumps, directly driven off the engine, provide a set flow rate of
hydraulic oil to power the steering and vibration systems.
Steering
he roller is power steered by means of a single double- acting hydraulic ram interconnected
between the front and rear halves of the center pivot articulated chassis.
When the steering wheel is turned in either direction, the Orbitrol hydrostatic steering unit
meters oil to the hydraulic steering ram causing the ram to extend or retract, thus steering
the roller to the right or left.
he Orbitrol steering unit contains a relief valve to ensure its gear pump does not over-
pressurize the steer system.
Introduction
WolfPac
6100
TM
9
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