Jlg 40H Service Manual User Manual download pdf (Page 45)

SECTION 2 - PROCEDURES

3120240 – JLG Lift – 2-25

before leveling out at the set RPMS when going from idle

to high engine.

Mid engine:

This adjustment is made by turning the 1/8" brass screw

clockwise (CW)to increase speed, and counterclockwise

(CCW) to decrease speed. The adjustment range of the

Mid engine pot is about 25 turns, each turn will change

engine speed by about 100 to 200 RPMS. THE pot is pro-

tected by an slip clutch at each end and will not be

harmed by moderate over adjustment. However, the gov-

ernor will not function when the pot is past full travel. If you

suspect that you have over adjusted the Mid engine pot,

or have lost track of where you are, turn the pot 25 turns

out (CCW), then turn in (CW), 15 turns. This will get you

back into the range you should be in. Make all adjust-

ments before setting the mid engine.

Start lockout:

This adjustment is made by turning the 1/8" brass screw

clockwise (CW) to increase speed and counterclockwise

(CCW) to decrease speed. The adjustment range of the

Start lockout pot is about 25 turns, each turn will change

engine speed by about 100 to 200 RPMS. This pot is pro-

tected by a slip clutch at each end and will not be harmed

by moderate over-adjustment. However, the governor will

not function when the pot is past full travel. If you suspect

that you may have over-adjusted the Start lockout pot, or

have lost track of where you are, turn the pot to 25 to 30

turns in (CW), Then turn out (CCW) 8 1/2 turns. This will

get you back into the range you should be in. Start lock-

out should normally not have to be adjusted. Normally

startout should occur at around 500 RPM. If while crank-

ing the engine seems to stop momentarily then reengages

the starter, turn the adjustment in (CW) 1/4 to 1/2 turn at a

time until the engine will crank with out locking out start. If

the starter engages while the engine is running, check the

idle RPMS before adjusting the governor. On the 800

series, this should be 1000 RPMS. Do not set the RPMS

above 1100 RPMS as this will cause engine shut down

problems that will be similar to dieseling

Over speed:

This adjustment is made by turning the 1/8" brass screw

clockwise (CW) to increase speed, and counterclockwise

(CCW) to decrease speed. The adjustment range of the

Over speed pot is about 25 turns, each turn will change

engine speed about 100 to 200 RPMS. This pot is pro-

tected by a slip clutch at each end and will not be harmed

by moderate over-adjustment. However the governor will

not function when the pot is past full travel. If you suspect

that you have over-adjusted the Over speed pot, or have

lost track of where you are, turn the pot 25 turns in (CW),

then turn out (CCW) 5 1/2 turns. This will get you back into

the range you should be in. Over speed should normally

not have to be adjusted. When adjusting Over speed

make sure other adjustments have been made correct.

Factory:

This adjustment is made by turning the plastic screw

clockwise (CW) to increase governor sensitivity, counter-

clockwise (CCW) to decrease sensitivity. The adjustment

range of the Factory range of the pot is about 3/4 of a turn,

AND OVERTURNING WILL BREAK THE INTERNAL

STOPS, making further adjustments impossible. The Fac-

tory setting normally will not have to be adjusted.

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Jlg 40H Service Manual User Manual Page 45

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