Governor
System
.The purpose of the engine governor is to maintain a
constant engine speed during changes in
power
demands. A governor responds to changes in power
demands by varying the throttle position. A constant-
speed governor is standard on industrial engines.
GOVERNORS
I
he constant-speed governor (Figure 41) maintains
engine speed up to 2400-rpm. The speed-sensing
device is a ball and cup mechanism on the camshaft
gear. A yoke, resting on the cup, is connected to the
governor arm which, in turn, is connected to the
Ihrottle lever. Any change in engine speed is
transmitted from the cup to the yoke, and on to the
throttle.
-
'Tension on the governor spring determines thespeed
at which the engine is governed.
A
stud screwed into
the spring is used to varythenumberof effective coils
for getting the desired sensitivity-the speed drop
from
no
load
to full load.
8435
Maintenance:
The linkage must be able to move
freely through its entire travel. Periodically lubricate
the ball joints with graphite. Also, inspect the linkage
for binding, excessive slack, and wear.
Testing and Repair:
Removing the gear cover for
access to the governor cup and other internal gover-
nor parts is covered
in
the
ENGlNE
DISASSEMBLY
section. External service and repair is limited to
testing spring tension and checking ball joints.
To
test spring rates, use aspring-type scale. Compare
the measured rates with those in Table 2.
TABLE
2.
GOVERNOR SPRING
DATA
Engine Governor Spring Spring
Model
1
Type
1
Number
1
L:zh
I
Rare
4
RDJF
Constant
150-1084
3.0
in.
69
Ibs/in
(76.2
mm)
(12.09
N/mm)
DECREASE
SENS ITlVlTY
FIGURE
41.
GOVERNOR ASSEMBLY AND ADJUSTMENTS
39
Redistribution or publication of this document,
by any means, is strictly prohibited.
To Next Page
Loading...
Need help?
General
