Jlg 40H Service Manual User Manual download pdf (Page 42)

SECTION 2 - PROCEDURES

2-22 – JLG Lift – 3120240

Carburetor and Governor Adjustment.

1. With the aid of an assistant, start the engine at the

platform console and allow it to come up to operat-

ing temperature with air cleaner installed. Adjust car-

buretor idle screw until engine idles at 1000 RPM.

Shut down engine.

NOTE: Steps 2 and 3 are preliminary settings.

2. On controller (in ground control box) turn ‘high

engine’ (P1) adjusting screw 25-30 turns CCW, then

10 turns CW.

3. On controller (in ground control box) turn ‘gain’ (P2)

adjusting screw CCW to the stop, then CW until

screw slot is vertical (approximately 1/4 turn).

4. On controller (in ground control box) turn ‘droop’

(P3) adjusting screw CCW to the stop, then CW until

screw slot is vertical (approximately 1/4 turn). No fur-

ther adjustment should be necessary to ‘droop’

(P3).

5. With the aid of an assistant at platform console start

the engine and allow to come up to operating tem-

perature. Then have assistant depress footswitch

and place engine speed switch to HIGH ENGINE.

6. If engine surging occurs at this point, turn ‘gain’ (P2)

adjusting screw CCW until surging ceases. Turn

‘high engine’ (P1) adjusting screw until engine runs

at 2400 RPM. Turning the screw CW increases RPM.

Turning the screw CCW decreases RPM.

7. While your assistant continues to depress the foot-

switch, have him place engine speed switch to LOW

ENGINE. Turn ‘low (mid) engine’ adjusting screw

until engine runs at 1800 RPM. Turning the screw

CW increases RPM. Turning the screw CCW

decreases RPM. Shut down engine. Seal all trim

pots when finished with finger nail polish.

NOTE: If engine surges under no load, on HIGH ENGINE

and you cannot get enough response from adjusting

‘gain’ (P2), try adjusting surge screw on actuator.

Loosen surge screw locknut. Disconnect throttle link-

age. Turn surge screw CW until linkage arm moves.

Manually stroke the linkage fully and allow to return

slowly until it stops. Try to move linkage towards

return position. If linkage moves, turn surge screw

CCW 1/2 turn. Again stroke linkage and allow to

return slowly until it stops. Try to move linkage

towards return position. If linkage moves, turn surge

screw CCW 1/2 turn. Repeat this procedure until

linkage does not move after stroking. Do not turn any

more. This will set buffer spring tension properly.

Reconnect throttle linkage.

8. With engine speed switch set to LOW ENGINE,

when footswitch is depressed engine should imme-

diately respond, if response time lags, turn ‘gain’

(P2) adjusting screw CW to improve response time.

Turn adjusting screw in small increments only until

response time is correct. Turning adjusting screw

too far CW can cause surging. (See 6 above)

2.16 ELECTRIC GOVERNOR AND

ADJUSTMENTS - FORD ENGINES.

General.

These instructions presume no electrical test equipment

other than a multimeter for making the electrical measure-

ments called for on the following pages. If no suitable

meter is available, an inexpensive but adequate meter,

part number 22-188 is available from any local Radio

Shack store.

Many "governor problems" are due to installation prob-

lems, particularly in first time applications. Careful atten-

tion to the directions provided will result in a successful

installation made in the least amount of time.

Quick-start Installations.

If you are experienced in installing and adjusting Electric

Governor, follow these steps. Otherwise refer to the more

detailed instructions starting with "Mounting-Actuator".

1. Mount Actuator rigidly to engine location which will

permit a short, straight linkage to the carburetor or

fuel valve. Avoid very hot areas.

2. Mount controller in a dry, fairly cool location. Acces-

sibility for adjusting is required

3. Wire per appropriate included schematic, using #16

wire.

4. Set up fuel linkage. This is critical, so review the sec-

tion titled "LINKAGE".

5. Hold linkage for safety, and start the engine.

6. Adjust engine speed to desired valve using High

Engine pot. (See diagram on page 43 E-331 Elec-

tronics - Adjustment Locations.)

Mounting-Actuator.

The Actuator may be mounted in any attitude - there is no

preferred orientation

With no power applied, the actuator is spring loaded to

the minimum fuel position. The Actuator output shaft

rotates toward the maximum fuel position against this

spring through electrical power from the controller. This

rotation is CW (clockwise) on one side of the Actuator, and

CCW (counterclockwise) on the other. If necessary,

reverse the Actuator on its mounting plate so that the

desired direction of rotation is on the desired side to

match the fuel system direction of travel.

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