TM 5-3895-383-248.Adjust high amplitude relief valve (4) in the followingsteps: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). Thiswill ensure that the oil does not leak whileadjustments are made to the cartridge and the spring.d.Hold the high pressure relief valve cartridge in abench vise. Secure the high pressure relief valvecartridge 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 byturning spindle (5). Turn the spindle clockwise inorder to increase the pressure. Turn the spindlecounterclockwise in order to decrease the pressure.One full rotation of spindle (5) equals 4400 kPa (638psi).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) andtorque to specifications.9.Repeat Step 5.10.Stop the engine.NOTE: After five minutes of operation, when the drum ison tires, the vibratory operating pressure shoulddecrease to a maximum of 10340 kPa (1500 psi).If continued high pressure is observed, a problemmay exist with the vibratory drive mechanism.Low AmplitudeIllustration 51Vibratory Pump(8) Test port.1.Make sure that the parking brake is applied. Ensurethat the propel control lever is in the STOP position.2.Connect a 60000 kPa (8700 psi) pressure gauge torelief valve test port (8).Illustration 52Control Console(2) Vibratory amplitude control. (3) Vibratory ON/OFF control.3.Move vibratory amplitude control (2) to the LOWAMPLITUDE position.4.Install the Multitach in order to measure the engine rpm.Install 4C-6500 Digital Thermometer into the hydraulicoil tank. Start the machine and run the machine at highidle (2350 ± 50 RPM) until the hydraulic oil temperaturereaches 38C (100F).11-49
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