Jlg 40H Service Manual User Manual download pdf (Page 39)

SECTION 2 - PROCEDURES

3120240 – JLG Lift – 2-19

Installation.

1. Using suitable lifting equipment, position assembled

boom on turntable so that boom pivot holes in both

boom and turntable are aligned.

2. Insert boom pivot pin, ensuring that locating slots in

pin are aligned with setscrew locating holes in pin

bushings.

3. If necessary, gently tap pin into position with a soft

headed mallet. Secure pin with setscrews.

4. Connect all wiring to ground control box.

5. Using all applicable safety precautions, operate lift-

ing equipment in order to position boom lift cylinder

so that holes in cylinder rod end and boom structure

are aligned. Insert lift cylinder pin.

6. If necessary, gently tap pin into position with a soft

headed mallet, ensuring that pin plate holes are

aligned with attach holes in boom structure. Install

pin attaching bolts, washers and lockwashers.

7. Shut down machine systems.

8. Connect hydraulic lines running along side of boom.

9. Using all applicable safety precautions, operate

machine systems and raise and extend boom fully,

noting the performance of the extension cycle. If

chattering is apparent, extend chain system requires

adjustment.

10. Retract and lower boom, noting performance of

retraction cycle. If chattering is apparent, retract

chain system requires adjustment.

11. Shut down machine systems.

12. Adjust extend and retract chain systems as required

and secure adjustment recounts.

13. As necessary, lubricate all points requiring lubrica-

tion.

2.12 TILT ALARM SWITCH.

NOTE: There are two methods of adjustment, a manual

adjustment and an adjustment using a voltmeter.

PERFORM TILT ALARM SWITCH LEVELING PROCEDURE A MINI-

MUM OF EVERY SIX MONTHS TO ENSURE PROPER OPERATION

AND ADJUSTMENT OF SWITCH.

Manual Adjustment.

1. Park the machine on a flat, level surface. Ensure

machine is level and tires are filled to rated pressure.

NOTE: Ensure switch mounting bracket is level and securely

attached.

2. Level the base of the indicator by tightening the

three flange nuts through approximately one half of

its spring travel. DO NOT ADJUST THE “X” NUT

DURING THE REMAINDER OF THE PROCEDURE.

3. With the electrical connections complete, slowly

tighten one of the “Y” nuts until the circuit is closed

and the light on the Platform Control Console illumi-

nates.

4. Slowly back off the nut, counting the number of

turns, until the circuit is again closed and the light

again illuminates.

5. Divide the number of turns determined in step d. in

half. Tighten the nut this many turns. The line deter-

mined by this nut and the “X” nut is now parallel to

the ground.

6. Repeat steps 3. through 5. for the remaining “Y” nut.

The switch is now level.

7. Individually push down on one corner at a time;

there should be enough travel to cause the switch to

trip. If the switch does not trip in all three tests, the

flange nuts have been tightened too far. Loosen the

“X” nut and repeat steps 3. through 7.

Voltmeter Adjustment.

1. Park machine on a flat, level surface. Ensure

machine is level and tires are filled to rated pressure.

2. If engine is not running, turn ignition switch to ON.

3. Connect black lead of voltmeter to ground and red

lead to yellow wire protruding from pot on bottom of

sensor.

4. Adjust leveling nuts to obtain the highest possible

voltage reading.

5. Check Voltage at trip point in all four directions. If

voltage reading is not symmetrical, repeat step (4)

above.

2.13 HORIZONTAL HIGH SPEED CUTOUT

SWITCH ADJUSTMENT PROCEDURE.

Adjust switch to trip when boom reaches 0 degrees +0

degrees /-3 degrees.

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Jlg 40H Service Manual User Manual Page 39

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