Allis-Chalmers 400 Series - Page 31

Adjustments
FIGURE 19
NOTE: Because of inexcessibility of end of crank¬
shaft in this installation the use of an electronic
tachometer attached between spark plug and spark
plug lead wire is recommended (See Figure 19).
Attach spark plug lead wire to tachometer input
wire, attach tachometer output wire to spark plug,
and ground wire to tractor frame. Follow
instnjctions with tachometer for use on 4 cycle
engines.
Sensitivity Adjustment: If speed drops consider¬
ably when a normal load is applied, governor
should be set for greater sensitivity. If set too
positive, speed surging will occur with changing
load. Governor sensitivity is adjusted by re¬
positioning governor spring in holes provided in
governor arm bracket and high speed bracket
Increase tension on spring {and sensitivity) by
moving spring hooks into holes spaced further
apart - conversely, decrease sensitivity by reducing
tension on spring.