TM 5-3895-383-24
High Amplitude (Maximum Frequency)
1.
Turn variable vibration control knob (3) to the full
clockwise position.
2.
Depress vibratory on/off control switch (1) in order to
start the vibratory system. Read the vibrations per
minute (VPM) from optional VPM gauge or read the
VPM from the 133-0963 Vibration Tachometer or the
133-9905 Frequency Meter. The maximum frequency
for high amplitude should be 1965 ± 50 VPM.
3.
If the maximum frequency for high amplitude is not at
1965 50 VPM, "P4" high amplitude-minimum frequency
potentiometer (10) must be adjusted.
Illustration 64
Vibratory Pump
(13) Servo valve neutral adjustment screw.
4.
The maximum frequency should be controlled by the
electrical signal from the variable frequency controller.
If the correct maximum frequency cannot be obtained by
adjusting "P4" high amplitude-maximum frequency
potentiometer (12), turn servo valve neutral adjustment
screw (13) counterclockwise. This will ensure that the
movement of the servo piston is not limited.
5.
Remove the plastic cover from servo valve neutral
adjustment
screw
(13).
Loosen
the
jam
nut
arrangement
and
turn
the
servo
valve
neutral
adjustment screw counterclockwise for approximately
two turns.
6.
Repeat Steps 2 through 3. When the correct frequency
for high amplitude has been obtained, servo valve
neutral adjustment screw (13) should be turned
clockwise until the frequency is slightly decreased.
Then, servo valve neutral adjustment screw (13) should
be rotated counterclockwise for one half turn.
7.
Hold the screw and tighten the jam nut arrangement.
Install the plastic cover.
Low Amplitude (Minimum Frequency)
1.
Place vibratory amplitude control (2) in the LOW
AMPLITUDE position.
2.
Turn the variable vibration control knob (3) to the full
counterclockwise position.
3.
Depress vibratory on/off control switch (1) in order to
start the vibratory system. Read the vibrations per
minute (VPM) from optional VPM gauge or read the
VPM from the 133-0963 Vibration Tachometer or the
133-9905 Frequency Meter. The minimum frequency
for low amplitude should be 1400 ± 50 VPM.
4.
If the minimum frequency for low amplitude is not at
1400 ± 50 VPM, "P5" low amplitude-minimum frequency
potentiometer (9) must be adjusted. After adjusting "P5"
low amplitude-minimum frequency potentiometer (9),
verify that the minimum frequency for low amplitude is
correct.
Low Amplitude (Maximum Frequency)
1.
Turn variable vibration control knob (3) to the full
clockwise position.
2.
Depress vibratory on/off control switch (1) in order to
start the vibratory system. Read the vibrations per
minute (VPM) from optional VPM gauge or read the
VPM from the 133-0963 Vibration Tachometer or the
133-9905 Frequency Meter. Depress the vibratory
on/off control switch in order to shut off the vibratory
system. The maximum frequency for low amplitude
should be 1965 ± 50 VPM.
3.
If the maximum frequency for low amplitude is not at
1965 ±50 VPM, "P3" low amplitude-maximum frequency
potentiometer (11) must be adjusted.
Illustration 65
Vibratory Pump
(14) Servo valve neutral adjustment screw.
11-57
