If a testing time longer than three (3) minutes is required,
rotate the drum periodically in order to lubricate the
eccentric weight shaft bearings.
The hydraulic oil temperature should be at least
38° C (100° F).
(1) Test port.
Make sure that the parking brake is applied. Ensure
that the propel control lever is in the STOP position.
Connect a 60000 kPa (8700 psi) pressure gauge to
relief valve test port (1).
(2) Vibratory amplitude control. (3) Vibratory ON/OFF control.
Move amplitude selector (2) to the HIGH AMPLITUDE
Install the Multitach in order to measure engine rpm.
Install 4C-6500 Digital Thermometer into the hydraulic
oil tank. Start the machine and run the machine at high
idle (2350 ± 50 RPM) until the hydraulic oil temperature
reaches 38C (100F).
Look at the gauge and depress vibratory control switch
(3) to the ON position in order to start the vibratory
The force that is needed to overcome the inertia
of the weights causes the pressure in the
vibration system to momentarily reach the high
amplitude relief valve setting. Look at the gauge
and turn on the vibration system. The highest
reading on the gauge is the high amplitude relief
The high amplitude relief valve setting should be 35000
± 3000 kPa (5076 ±435 psi).
(4) High amplitude relief valve.
If the high amplitude relief valve setting is not correct,
high amplitude relief valve (4) must be adjusted.
Relief Valve Cartridge
(5) Spindle. (6) Collar. (7) Lock screw.