When the vibratory system is off and when the machine
is at high idle, read the amount of oil flow that passes
through the flow meter. The flow should be less than
3.8 L/min (1 US gpm).
Depress the vibratory on/off control to the ON position in
order to start the vibratory system. The flow should be
at a minimum of 5.0 L/min (1.3 US gpm) to a maximum
8.8 L/min (2.3 US gpm).
Depress the vibratory on/off control to the OFF position
in order to stop the vibration system. Stop the engine.
Move the vibratory a mplitude control to the HIGH
Repeat Steps 7 through 9.
If the flow is not within 5.0 L/min (1.3 US gpm) to a
maximum 8.8 L/min (2.3 US gpm), the size of the orifice
in the flushing valve may need to be changed. The
diameter of the orifice should be 1.9 mm (0.075 inch). If
the flow from the vibratory motor cannot be adjusted
correctly, the vibratory motor should be repaired or
Remove all test tooling and reconnect line (2) to motor
Vibratory Frequency - Test and Adjust
SMCS Code: 6606-025; 6606-081
Drum Vibration Tachometer
Personal injury or death can result from sudden machine
Sudden movement of the machine can cause injury to
persons on or near the machine.
To prevent injury or death, make sure that the area around
the machine is clear of personnel and obstructions before
operating the machine.
To avoid damage to the vibratory system during testing,
always perform the testing with the vibratory drum on top
of tires or on loose dirt.
Tires will simulate a non-compacted soil condition. Never
operate the vibratory system when the machine is on
If a testing time longer than three (3) minutes is required,
rotate the drum periodically in order to lubricate the
eccentric weight shaft bearings.
The hydraulic oil temperature should be at least
38° C (100° F).
(1) Vibratory on/off control switch. (2) Vibrato amplitude
control. (3) Variable vibration control knob.
Make sure that the parking brake is applied. Ensure
that the propel control lever is in the STOP position.
Move vibratory amplitude control (2) to the HIGH
Start the engine and run the engine at high idle. Engine
speed should be 2350 ± 50 rpm.