HYDRAULIC VIBRATORY TESTS
Equipment Condition (cont.)
Tools and Special Tools
Parking brake engaged. (TM 5-3895-379-10)
Tool Kit, General Mechanic's: Automotive
Drums chocked. (TM 5-3895-379-10)
Construction Equipment Repairer 91L (2)
Engine off. (TM 5-3895-379-10)
HIGH VIBRATORY FREQUENCY TEST
At operating temperature, hydraulic oil is hot. Escaping hydraulicfluid under pressure can
penetrate the skin, causing injury or death.
· Hydraulic oil must be certified to have anti-rust, very high viscosity index, and anti-
oxidation additive properties for heavy duty use.
· Oil temperature must be at 140°F +/- 5°F (60°C +/- 21°C).
Vibratory frequency test must be conducted on uncompacted dirt or on tires.
Place propel control lever in NEUTRAL (TM 5-3895-379-10).
Start and run engine at HIGH idle, 2,325 +/- 25 rpm until oil temperature is at least 100°F (38°C)
Apply parking brake and place propel control lever in forward position (TM 5-3895-379-10).
Place vibratory mode switch in dual drum position (TM 5-3895-379-10).
Press button on top of propel control lever to start vibratory system (TM 5-3895-379-10).
Record the reading from the Vibrations Per Minute (VPM) tachometer on steering console.
Press button on top of propel control lever to stop vibratory system (TM 5-3895-379-10).
Dual amplitude frequency must be 2,520 +/- 50 VPM in high.
END OF TASK