JLG M4069 ANSI Service Manual - Manual (Page 29)

SECTION 3 - CHASSIS & SCISSOR ARMS
3121122 – JLG Lift – 3-1
SECTION 3. CHASSIS & SCISSOR ARMS
3.1 CALIBRATIONS
Elevation Sensor Calibration
(Prior to Software V13.6)
NOTE: Make sure your analyzer is in ACCES LEVEL 1.
When using the analyzer the terms referring to
ROTARY & PROXIMITY sensors are ELEV SEN-
SOR & ELEV PROX.
Use ELEV SENSOR sub level menu for rotary switch
adjustments.
Use SET ELEV SENSOR top level menu for proxim-
ity switch adjustment and final calibrations.
NOTE: If the Always set the rotary switch first before the
proximity switch because they back each other up in
the case of a component failure.
1. When mounting, make sure the rotary switch is
aligned with the bladed pin mounted on the scissor
arm. There must be a preload when installing the
rotary switch on the bladed pin bracket, similar to a
throttle actuator.
2. There are (3) 3/8 mounting screws that hold the
switch onto the scissor arm mounting lug, make
sure they are snug, not loose, so you are able to
rotate the rotary switch.
3. Make sure the deck is fully lowered. Plug in the ana-
lyzer and scroll through DIAGNOSTICS/ELEV SEN-
SOR to ANGLE SNSR. This should read 0.40v -
0.45v.
NOTE: Anytime the ground control board or if the rotary sen-
sor is replaced the rotary sensor must be reset
(zeroed out).
4. If the reading is not within the spec, adjust the rotary
switch by rotating the bracket and viewing the ana-
lyzer.
5. Loosen the hardware that holds the proximity switch
and allow the switch to drop to the bottom of the
slide bracket. Using the analyzer, press escape
twice and scroll through ACCESS LEVEL 2. enter
the password to get into ACCESS LEVEL 1. Scroll to
SET ELEV SENSOR and after pressing ENTER you
should hear the motion alarm sounding off. This
puts the machine in adjustment mode.
NOTE: If your machine does not have a motion alarm, the
following procedures will still apply.
6. Lift the platform up until it stops lifting, this will be the
lift cut-out height.
7. Using the analyzer, press ESCAPE, scroll to DIAG-
NOSTICS, press ENTER, scroll to ELEV SENSOR
and press ENTER. You should now see ANGLE
SNSR. The setting here should be 0.60v - 0.70v. This
is the rotary switch output voltage that is being sent
to J2-15 of GEC at the lift cutout mark. A fully ele-
vated platform will read 2.95 volts.
8. Press ESCAPE on the analyzer, scroll to SYSTEM
then to ELEV PROX OPEN. Now manually adjust the
proximity switch until you see the analyzer read
ELEV PROX CLOSED. At this point make sure you
have the maximum 5/16 in of clearance between the
eye of the proximity switch and the scissor arm. If
you don’t, shim it. If everything is okay at this point
tighten it down, this setting is required in case the
rotary switch fails. The proximity switch is a back up
to assure proper lift cut-out.
NOTE: If the gap ever increases beyond 5/16 in., the switch
may cause intermittent operation.
9. Completely lower the platform. Using the analyzer
press escape and scroll through DIAGNOSTICS and
then go to ELEV SENSOR, press ENTER. Check to
see that the following items are reading correctly.
ANGLE SNSR 0.40 - 0.45
ZEROED 0.00V
SENSOR OK
STOWED? YES
ELEVATED? NO
DRIVE? YES
CALIB 0.40 - 0.45
10. If CALIB; reads whatever you set your rotary switch
to (0.40 - 0.45) then press ENTER.
11. Press ESCAPE until you arrive at DIAGNOSTICS,
then scroll over to top level menu SET ELV SEN-
SOR, press ENTER, an alarm will sound off if your
machine is equipped with one. The analyzer will now
ask to SET ELEV SENSOR. At this point press
ENTER key. If everything tested properly the ana-
lyzer will read COMPLETE.
12. Now lift the machine up until it stops lifting, measure
the cutback height;
M3369/3369LE - 8 ft - 9.5 ft (2.4 - 2.9 m)
M4069/4069LE - 9.5 ft - 11.7 ft (2.9 - 3.6 m)