TM 5-3895-379-23
HYDRAULIC VIBRATORY TESTS
0203 00
VIBRATORY FREQUENCY TEST
1.
Place propel control lever in NEUTRAL (TM 5-3895-379-10).
2.
Start and run engine at HIGH idle, 2325 +/- 25 rpm until oil temperature is at least 100F (38C) (TM 5-3895-379-10).
3.
Apply parking brake and place propel control lever in forward position (TM 5-3895-379-10).
4.
Place vibratory mode switch in dual drum position (TM 5-3895-379-10).
5.
Press button on top of propel control lever to start vibratory system (TM 5-3895-379-10).
6.
Record the reading from the Vibrations Per Minute (VPM) tachometer on steering console.
7.
Press button on top of propel control lever to stop vibratory system (TM 5-3895-379-10).
8.
Dual amplitude frequency must be 2520 +/- 50 VPM in high.
9.
If frequency is not in range, vibratory pump must be adjusted. Adjust as follows:
10.
Loosen locknut (1) on the adjustment screw (2).
11.
To increase vibrations per minute, turn adjustment screw (2) counterclockwise. To decrease, turn adjustment screw (2)
clockwise.
12.
Place propel control lever in REVERSE (TM 5-3895-379-10).
13.
Place vibratory mode switch in low amplitude (TM 5-3895-379-10).
14.
Dual amplitude frequency must be 2570 +/- 50 VPM in low.
15.
If frequency is not in range, vibratory pump must be adjusted. Adjust as follows:
16.
Loosen locknut (3) on the adjustment screw (4).
17.
To increase vibrations per minute, turn adjustment screw (4) counterclockwise. To decrease, turn adjustment screw (4)
clockwise.
18.
Turn engine off (TM 5-3895-379-10).
19.
Remove chocks (TM 5-3895-379-10).
INTER-CIRCUIT RELIEF VALVE TEST
WARNING
Use caution when using the propel control lever. Roller may move when switching from NEUTRAL to
REVERSE.
1.
Place propel control lever in NETURAL (TM 5-3895-379-10).
2.
Place vibratory mode switch in auto (TM 5-3895-379-10).
3.
Connect pressure gauge to tap (5).
4.
Start and run engine at HIGH idle (TM 5-3895-379-10).
5.
Place vibratory mode switch in dual drum vibration position (TM 5-3895-379-10).
6.
Place propel control lever in REVERSE (TM 5-3895-379-10). Pressure reading should be 3350 +/- 100 psi (23100 kPa
+/- 689 kPa).
7.
If pressure is not in range, inter-circuit relief valve (6) must be adjusted. To increase pressure, turn adjustment screw (7)
counterclockwise. To decrease, turn adjustment screw (7) clockwise.
8.
Recheck pressure at tap (5).
0203 00-2
