SECTION 2 - PROCEDURES
2-48
– JLG Lift –
3120686
2.23 PQ CONTROLLERS
NOTE:
The following procedures are to be used as a begin-
ning basis for controller adjustment. After completing
the procedure, final adjustments are to be made
based on the machines function speed.
TRIM Adjustment (Prior to S/N 38697)
1.
Perform the following checks with ignition power to
the platform, with the engine NOT running.
1.
Install ammeter capable of measuring from zero to 2
amps in series with either valve coil B or D.
2.
Position IGNITION/EMERGENCY STOP switch to
ON, but do not start engine.
3.
Using a screwdriver, adjust the ramp trimpot coun-
terclockwise 25 turns or until the trimpot clicks.
4.
Depress footswitch.
5.
Operate controller until trailing edge of slide lock is
even with housing lock notch. Hold control handle in
that position.
6.
Check the mA reading in the opposite direction.
7.
Operate the controller until the trailing edge of the
slide lock is even with the housing lock notch. Hold
the control handle in that position. Check the mA
reading.
8.
Verify step 7 and step 8 mA readings are within 0.50
mA of each other. If the readings are within toler-
ance, proceed to step 12.
9.
If the readings in step 9 were not within tolerance,
Loosen the setscrew located in the gear on the
potentiometer shaft of the controller. Using a screw-
driver, adjust the potentiometer very slightly in either
direction. Tighten the setscrew on the gear and
recheck for the proper mA readings. Repeat this
step until the proper adjustment is obtained.
Table 2-4. Function Speeds
Function
Function Speed
In Seconds
(Prior to S/N
38697)
In Seconds
(S/N 38697
to Present)
Telescope
Extend
132-170
80-100
Retract
140-175
75-100
Lift
Up
125-160
85-100
Down
108-132
75-100
Extend-A-Reach
Up
15-25
15-25
Down
15-25
15-25
Swing Speed
Full 360
160-200
160-200
Platform Rotation
Left
20-30
20-30
Right
20-30
20-30
Ground to 120’
257-330
165-200
From 120’ to Ground
248-307
150-200
Ground to 120’ to Ground
505-637
315-400
Drive Speed
46-56 @ 200ft.
46-56 @ 200ft.
Table 2-5. Platform Controller Settings (Prior to S/N
38697)
Function
Settings in mA
Lo
Mid
Hi
Lift
410
650
1300
Swing
410
650
1300
Table 2-6. Platform Controller Settings (S/N 38697 to
Present)
Function
Settings in mA
Ramp
Turns
Lo
Mid
Hi
Lift
200
400
1100
6
Swing
200
400
1100
6
Drive
40
70
180
10
Flow Control
170
N/A
1000
N/A
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