RD 12 / RD 12A Vibration System and Steering
wc_tx000668gb.fm 59
Continued from the previous page.
5. Turn on the vibration and measure the relief and operating pressures. The relief
pressure is the pressure registered on the gauge as soon as the vibration is
turned on. The system will then settle into operating pressure. Record these two
pressures.
6. Shut down the machine.
Compare the results from operating pressure, pump relief pressure, and exciter
speed with the chart below.
N = Normal, L = Low, H = High
If the exciter is binding or causing high operating pressures, perform the following:
1. Disconnect and remove the exciter motor
(c) from the housing.
2. Turn the motor shaft and exciter shaft by hand and check that they both turn
freely.
3. If either component does not turn freely, it has failed; replace it.
The vibration system has now been checked for poor vibration.
Operating
Pressure
Pump Relief
Pressure
Exciter
Speed
Probable Cause
NNN System OK
H N N or L Exciter bearings or motor binding
N or L N L Exciter motor worn
L L L Exciter pump damaged or worn, relief
valve defective, or needs adjusting
wc_gr004143
c
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