Repair manual

Troubleshooting the Vibration System RD 27
wc_tx000953gb.fm 76
5.8 Checking Engine RPM and Drum VPM
Prerequisites  Vibrotach (P/N 53397)
 Vibration must turn on
Procedure Follow the procedure below to check the engine rpm and drum vpm (vibrations per
minute).
1. Start the engine and place the throttle switch in the 66 Hz (FAST) position.
2. Measure the engine rpm using a vibrotach.
3. Measure the vpm (vibrations per minute) by placing the vibrotach on the rim of
the drum while vibration is on.
4. If the vpm is not 3860–4060, adjust the throttle linkage (a) until it is.
Result The procedure to check the engine rpm and drum vpm is now complete.