Kohler Command Pro CV980 - Manual (Page 43)

5.15
Section 5
Fuel System and Governor
5
Governor
Lever
Governor
Cross Shaft
Governed
Idle Spring
Linkage
Governor
Spring
Governor
General
The governor is designed to hold the engine speed
constant under changing load conditions. Most
Ž—’—ŽœȱŠ›ŽȱŽšž’™™Žȱ ’‘ȱŠȱŒŽ—›’žŠ•ȱĚ¢ Ž’‘ȱ
–ŽŒ‘Š—’ŒŠ•ȱ˜ŸŽ›—˜›ǯȱ‘Žȱ˜ŸŽ›—˜›ȱŽŠ›ȦĚ¢ Ž’‘ȱ
mechanism of the mechanical governor is mounted
’—œ’Žȱ‘ŽȱŒ›Š—”ŒŠœŽȱŠ—ȱ’œȱ›’ŸŽ—ȱ˜ěȱ‘ŽȱŽŠ›ȱ˜—ȱ‘Žȱ
ŒŠ–œ‘ŠĞǯȱ‘’œȱ˜ŸŽ›—˜›ȱŽœ’—ȱ ˜›”œȱŠœȱ˜••˜ œDZ
• Centrifugal force acting on the rotating governor
ŽŠ›ȱŠœœŽ–‹•¢ȱŒŠžœŽœȱ‘ŽȱĚ¢ Ž’‘œȱ˜ȱ–˜ŸŽȱ
outward as speed increases. Governor spring
tension moves them inward as speed decreases.
Figure 5-36. Governor Linkage (Air Cleaner
Removed for Clarity).
Ȋȱ œȱ‘ŽȱĚ¢ Ž’‘œȱ–˜ŸŽȱ˜ž Š›ǰȱ‘Ž¢ȱŒŠžœŽȱ‘Žȱ
regulating pin to move outward.
• The regulating pin contacts the tab on the cross
œ‘ŠĞȱŒŠžœ’—ȱ‘Žȱœ‘ŠĞȱ˜ȱ›˜ŠŽǯ
ȱ Ȋȱ —ŽȱŽ—ȱ˜ȱ‘ŽȱŒ›˜œœȱœ‘ŠĞȱ™›˜›žŽœȱ‘›˜ž‘ȱ‘Žȱ
Œ›Š—”ŒŠœŽǯȱ‘Žȱ›˜Š’—ȱŠŒ’˜—ȱ˜ȱ‘ŽȱŒ›˜œœȱœ‘ŠĞȱ’œȱ
›Š—œ–’ĴŽȱ˜ȱ‘Žȱ‘›˜Ĵ•Žȱ•ŽŸŽ›ȱ˜ȱ‘ŽȱŒŠ›‹ž›Ž˜›ȱ
‘›˜ž‘ȱ‘ŽȱŽ¡Ž›—Š•ȱ‘›˜Ĵ•Žȱ•’—”ŠŽǯȱŽŽȱ’ž›Žȱ
śȬřŜǯ
ȱ Ȋȱ ‘Ž—ȱ‘ŽȱŽ—’—Žȱ’œȱŠȱ›ŽœǰȱŠ—ȱ‘Žȱ‘›˜Ĵ•Žȱ’œȱ’—ȱ
the “fastȄȱ™˜œ’’˜—ǰȱ‘ŽȱŽ—œ’˜—ȱ˜ȱ‘Žȱ˜ŸŽ›—˜›ȱ
œ™›’—ȱ‘˜•œȱ‘Žȱ‘›˜Ĵ•Žȱ™•ŠŽȱ˜™Ž—ǯȱ‘Ž—ȱ‘Žȱ
engine is operating, the governor gear assembly
is rotating. The force applied by the regulating
™’—ȱŠŠ’—œȱ‘ŽȱŒ›˜œœȱœ‘ŠĞȱŽ—œȱ˜ȱŒ•˜œŽȱ‘Žȱ
‘›˜Ĵ•Žȱ™•ŠŽǯȱ‘Žȱ˜ŸŽ›—˜›ȱœ™›’—ȱŽ—œ’˜—ȱŠ—ȱ
the force applied by the regulating pin balance
each other during operation, to maintain engine
speed.
• When load is applied and the engine speed and
governor gear speed decreases, the governor
spring tension moves the governor arm to open
‘Žȱ‘›˜Ĵ•Žȱ™•ŠŽȱ ’Ž›ǯȱ‘’œȱŠ••˜ œȱ–˜›ŽȱžŽ•ȱ
into the engine, increasing the engine speed.
œȱ‘Žȱœ™ŽŽȱ›ŽŠŒ‘Žœȱ‘Žȱ˜ŸŽ›—ŽȱœŽĴ’—ǰȱ‘Žȱ
governor spring tension and the force applied by
‘Žȱ›Žž•Š’—ȱ™’—ȱ ’••ȱŠŠ’—ȱ˜ěœŽȱŽŠŒ‘ȱ˜‘Ž›ȱ˜ȱ
hold a steady engine speed.
Adjustments
DZȱ ˜ȱ—˜ȱŠ–™Ž›ȱ ’‘ȱ‘Žȱ˜ŸŽ›—˜›ȱœŽĴ’—ǯȱ
ŸŽ›œ™ŽŽȱ’œȱ‘Š£Š›˜žœȱŠ—ȱŒ˜ž•ȱŒŠžœŽȱ
personal injury.
General
‘Žȱ˜ŸŽ›—Žȱœ™ŽŽȱœŽĴ’—ȱ’œȱŽŽ›–’—Žȱ‹¢ȱ‘Žȱ
™˜œ’’˜—ȱ˜ȱ‘Žȱ‘›˜Ĵ•ŽȱŒ˜—›˜•ǯȱ ȱŒŠ—ȱ‹ŽȱŸŠ›’Š‹•Žȱ˜›ȱ
constant, depending on the engine application.
Initial Adjustment Procedure
Make this adjustment whenever the governor arm is
•˜˜œŽ—Žȱ˜›ȱ›Ž–˜ŸŽȱ›˜–ȱ‘ŽȱŒ›˜œœȱœ‘ŠĞǯȱŽŽȱ’ž›Žȱ
śȬřŜȱŠ—ȱŠ“žœȱŠœȱ˜••˜ œDZ
ȱ ŗǯȱ Š”Žȱœž›Žȱ‘Žȱ‘›˜Ĵ•Žȱ•’—”ŠŽȱ’œȱŒ˜——ŽŒŽȱ˜ȱ
‘Žȱ˜ŸŽ›—˜›ȱŠ›–ȱŠ—ȱ‘Žȱ‘›˜Ĵ•Žȱ•ŽŸŽ›ȱ˜—ȱ‘Žȱ
carburetor.
ȱ Řǯȱ ˜˜œŽ—ȱ‘Žȱ‘Ž¡ȱ—žȱ‘˜•’—ȱ‘Žȱ˜ŸŽ›—˜›ȱ•ŽŸŽ›ȱ˜ȱ
‘ŽȱŒ›˜œœȱœ‘ŠĞǯ
3. Move the governor lever toward the carburetor
ŠœȱŠ›ȱŠœȱ’ȱ ’••ȱ˜ȱǻ ’Žȱ˜™Ž—ȱ‘›˜Ĵ•ŽǼȱŠ—ȱ‘˜•ȱ
in this position.
4. Insert a long thin rod or tool into the hole on the
Œ›˜œœȱœ‘ŠĞȱŠ—ȱ›˜ŠŽȱ‘Žȱœ‘ŠĞȱŒ•˜Œ” ’œŽȱǻŸ’Ž Žȱ
from the end) as far as it will turn, then torque
the hex nut to 7.3 N·m (65 in. lb.).
High Speed (RPM) Adjustment (Refer to Figure
5-37.)
ȱ ŗǯȱ ’‘ȱ‘ŽȱŽ—’—Žȱ›ž——’—ǰȱ–˜ŸŽȱ‘Žȱ‘›˜Ĵ•Žȱ
control to fast. Use a tachometer to check the
RPM speed.
ȱ Řǯȱ ž›—ȱ‘Žȱ’——Ž›Ȧž™™Ž›ȱœŒ›Ž ȱ˜ž Š›ȱ˜ȱŽŒ›ŽŠœŽǰȱ
or inward to increase the RPM speed. Check RPM
with a tachometer.