Jlg 40H Service Manual User Manual download pdf (Page 49)

SECTION 2 - PROCEDURES

3120240 – JLG Lift – 2-29

to provide sufficient fuel but Governor arm

moves far enough when disconnected look for:

1. Linkage binding or misadjusted.

2. Low voltage at Governor during operation.

NOTE: *Measure the voltage as discussed previously and

observe voltage during operation. If Governor fails to

move full on and voltage dips over 1 volt, check for

undersize wire (should be #16 minimum).

3. Excessive force at Governor during engine running,

particularly on carbureted engines.

NOTE: *Carburetor butterfly valves are loaded by engine

vacuum during running, which can add considerable

force not present when engine isn’t running.

NOTE: *Springs in the system; carburetor return springs,

acceleration pump springs, etc., are not usually

needed and can cause governing problems.

b. Governor is unstable at light-load or no-load.

See “Linkage” for carburetor engines.

c. Governor experiences sudden, momentary

spikes toward max. at random intervals, then

recovers.

1. Look for loose wiring or momentary shorts in wiring.

Noise or occasionally missing speed signal.

d. Speed seems to slowly wander (5-15 second

periods) around at speed, particularly at higher

loads. See item 2a. 3 concerning excessive on

Governor.

(3.) Governor not tuned or adjusted for engine/applica-

tion.

The basic adjustment to set sensitivity/stability is the Gain

pot. A good starting point for many engines is full CCW,

then CW 1/3 turn. (See “Governor adjustment” section).

To increase stability, turn CCW. If satisfactory governing

cannot be achieved with this one adjustment, the factory

adjustment may be needed. Normal starting point for this

adjustment is fully CCW, then CW 1/4 turn. (Before chang-

ing this pot, mark the original position).

NOTE: If problems occurs with the Governor overshooting

when a large load is released from the engine, such

as driving up a hill and stopping. There is usually

one of two things:

a. Gain adjustment is to far CCW.

Mechanical preload between the carburetor and actuator

is to large, this should be no greater than 1/2 to 1 ball dia.

(Ref. to page 43 par. 1).

Automatic Choke Adjustment Procedure

(For all JLG 1.IL and 2.3L Ford carbureted engines)

1. At 70°F the choke plate should be open 1/3” (not

touching the choke bore).

2. If the ambient temperature is not 7o°F, an additional

adjustment is required:

a. Loosen the three cover plate screws.

b. Adjust the cover to open the choke plate 1/32”.

c. Readjust for ambient temperature by rotating the

cover one (1) mark per 5°F from 70°. Rotate

CCW (lean) if warmer than 70°, CW (rich)if colder

than 70°.

(If actual temperature is 80°, set at 1/32” and

rotate two (2) marks CCW (lean) direction.)

Tighten the three cover plate screws and check for free

rotation (no sticking or binding) of the choke shaft.

2.17 THROTTLE CHECKS AND

ADJUSTMENTS - DEUTZ F2L511

ENGINE. (SEE FIGURE 2-8.)

NOTE: Never run fuel tank dry. Diesel engines cannot be

restarted after running out of fuel until fuel system

has been air-vented or ‘bled’ of air. See Deutz

Instruction Manual for procedure.

Disconnect actuator cable from throttle lever. With

the aid of an assistant, start the engine and allow

it to come up to operating temperature. Adjust

throttle lever stop until engine runs at 1800 RPM.

Shut down engine. Reattach actuator cable to

throttle lever making sure that low engine setting

remains the same. If necessary, adjust slide pin to

contact low engine limit switch at 1800 RPM. Shut

down engine.

With the aid of an assistant, start engine from bas-

ket and allow to come up to operating tempera-

ture. Disconnect proportional dump valve wire.

Activate footswitch. Turn on HIGH ENGINE

switch. Hold drive controller in full drive position.

Adjust slide pin to contact high engine limit switch

at 3000 RPM. Shut off all switches and controllers.

Reconnect proportional dump valve wire.

NOTE: Actuator cable travel must stop slightly before lever

makes contact with throttle lever stop. Failure to do

so will burn out actuator.

NOTE: Early machines are at idle until a function is acti-

vated. Later machines are at idle only at platform

without footswitch activated. Therefore when setting

low engine speed on later machines it will not be

necessary to disconnect bang-bang dump valve wire

or operate a bang-bang function. Just activate foot-

switch to get low engine.

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Jlg 40H Service Manual User Manual Page 49

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