SERVICE MANUAL
CALIBRATION
Section 5
Figure 7. Adjusting Hi-Idle Rack Position
1.
Hi-Idle Stop Screw
2.
Lock Nut
a.
Loosen locknut and turn hi-idle stop screw
with wrench counterclockwise to decrease
rack dimension, or clockwise to increase
rack dimension.
b.
Tighten
locknut
and
recheck
rack
dimension.
Governor Performance at No-Load (Hi-Idle) Check
16.
Operate test stand, with control lever assembly
positioned as specified, at specified RPM listed
on CALIBRATION CHART and observe rack
position. Rack position as shown on dial
indicator should be as specified on Calibration
Chart.
If specified rack position is unattainable, recheck
governor
cut-off
(internal
adjustment)
and
governor
cut-off
(external
adjustment)
calibrations.
Governor End Regulation Check
17.
Operate test stand at specified RPM with control
lever assembly in full load position (fully forward)
and observe rack position. Rack position should
be 0.1-1.0 mm (.0039-.039"). If specified rack
position is unattainable, recheck governor cut-off
internal
adjustment
and
governor
external
adjustment calibrations.
Governor Lo-ldle Regulation Check
NOTE: Steps 18 and 19 are not independent checks.
One must not be achieved without the other.
18.
Operate test stand at specified RPM with control
lever assembly positioned as specified.
If rack is not within specified limits, make
governor adjustments as follows:
a.
Remove adjusting nut (count clicks to
flush), spring seat and outer spring. Add or
remove outer spring shims to achieve
specified control rack position.
b.
To increase rack position shims must be
added and to decrease rack position shims
must be removed. Add or remove same
shim pack on both sides.
c.
Install outer spring, spring seat, adjusting
nut, preload governor springs to initial
setting from flush position and recheck.
d.
If specified rack position still cannot be
obtained by steps a, b and c, recheck
"slider to housing" and "S-plate" basic
dimensions (Section 4, Page 5).
Lo-ldle Back-Up Check
19.
Operate test stand at specified RPM with control
lever positioned as specified.
Decrease test stand speed to 100 RPM. Rack
position should be 9.0 mm (.354") or greater as
shown on dial indicator.
If rack is not positioned as specified, repeat
Steps 3 on. Bring low idle stop screw up to
touch control lever (Figure 8).
Step/No Step Check
20.
Check for continuous rack movement while
increasing speed within the range specified on
calibration chart (Step/No Step Check). Rack
should not stay in any one position for more than
25 RPM. If rack is "sticky, " correct.
CGES-375
Printed in United States of America
Page 5
