The maximum frequency should be controlled by the
electrical signal from the variable frequency controller.
If the correct maximum frequency cannot be obtained by
potentiometer (11), turn servo valve neutral adjustment
screw (14) counterclockwise. This will ensure that the
movement of the servo piston is not limited.
Remove the plastic cover from servo valve neutral
adjustment screw counterclockwise for approximately
Repeat Steps 2 through 3. When the correct maximum
frequency for low amplitude has been obtained, servo
valve neutral adjustment screw (14) should be turned
clockwise until the frequency is slightly decreased.
Then, servo valve neutral adjustment screw (14) should
be rotated counterclockwise for one half turn.
Hold the screw and tighten the jam nut arrangement.
Install the plastic cover.
When the frequency is correct, stop the engine and
remove all tooling.
Variable Frequency Electrical Control - Test and Adjust
SMCS Code: 6606-025-EL; 6606-081-EL
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
If a testing time longer than three (3) minutes is required,
rotate the drum periodically in order to lubricate the
eccentric weight shaft bearings.
6V-7070 Digital Multimeter (or equivalent)
Fabricated Wiring Harness
Voltage Regulator Test
Before you perform this test, the condition of fuse
(5), which is located on the variable frequency
controller (1) should be verified.
(1) Variable frequency controller. (5) Fuse.