23 pq controllers, Pq controllers -48 – JLG 120HX ANSI Service Manual User Manual

Page 68

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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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