Illustration 53 Vibratory Pump

TM-5-3895-383-24
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TM 5-3895-383-24 5. Look at the gauge and depress vibratory on/off control (3) to the ON position in order to start the vibratory system. NOTE: The force that is needed to overcome the inertia of the weights causes the pressure in the vibration system to momentarily reach the low amplitude relief valve setting. Look at the gauge and turn on the vibration system. The highest reading on the gauge is the low amplitude relief valve setting. 6. The low amplitude relief valve setting should be 35000 ± 3000 kPa (5076 ±435 psi). Illustration 53 Vibratory Pump (9) Low amplitude relief valve. 7. If the low amplitude relief valve setting is not correct, low amplitude relief valve (9) must be adjusted. Illustration 54 Relief Valve Cartridge (5) Spindle. (6) Collar. (7) Lock screw. 8. Adjust low amplitude relief valve (9) in the following steps: a. Stop the engine. b. Remove the cap of high amplitude relief valve (4). c. Remove the high pressure relief valve cartridge. Install the cap of high pressure relief valve (4). This will prevent oil leakage while adjustments are made to the cartridge and the spring. d. Hold the high pressure relief valve cartridge in a bench vise. Secure the high pressure relief valve cartridge by clamping on collar (6). e. Loosen lock screw (7) with a 3 mm Allen wrench. f. Use a 5 mm wrench and adjust the pressure by turning spindle (5). Turn the spindle clockwise in order to increase the pressure. Turn the spindle counterclockwise in order to decrease the pressure. One full rotation of spindle (5) equals 4400 kPa (638 psi). g. Tighten lock screw (7). h. Remove the high pressure relief valve from the vise. i. Reinstall the high pressure relief valve cartridge. Install the cap of high pressure relief valve (4) and torque to specifications. 9. Repeat Step 5. 10. Stop the engine. NOTE: After five minutes of operation, when the drum is on tires, the vibratory operating pressure should decrease to a maximum of 10340 kPa (1500 psi). If continued high pressure is observed, a problem may exist with the vibratory drive mechanism. 11-50

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