TM 5-3895-379-10
THEORY OF OPERATION - CONTINUED
0003 00
VIBRATORY SYSTEM
1.
The hydraulic vibratory motors, located on the left of the front drum and the right of the rear drum, turn an eccentric
weight located inside each drum. As the eccentric weight spins, kinetic energy creates forces that cause the drum to
vibrate, which intensifies the roller compaction of surface material. The eccentric weight is a chamber filled with steel
shot and has a weight attached to one side. Inside the chamber are baffles. As the weight is turned one direction, the baf-
fle collects the steel shot on the same side as the weight to produce a severe imbalance in the rotation. The imbalance
causes the entire drum to vibrate. This is the high amplitude. As the weight is turned the other direction, the baffle col-
lects the steel shot on the opposite side as the weight to produce a mild imbalance in the rotation causing less vibration.
This is the low amplitude.
2.
Each drum is isolated from the rest of the roller by twenty-four rubber isolation blocks. The isolation blocks allow the
operator to remain in relative comfort as the drums are fully vibrating. The vibratory system gets its power from the
vibratory hydraulic pump, which is attached to the propel hydraulic pump which is attached to the engine.
3.
The vibration control switches control the varied vibratory modes by activating electric solenoids in the hydraulics of
the vibratory system. The operator can select which drum vibrates, how the system is activated, and the severity of the
vibration action.
BAFFLE
STEEL SHOT
ECCENTRIC
WEIGHT
WEIGHT
HYDRAULIC VIBRATORY MOTOR
ISOLATION BLOCKS
401-009
HYDRAULIC VIBRATORY MOTOR
0003 00-4