7 troubleshooting, 7 troubleshooting -9, Manually propelled vertical lifts) -9 – JLG LSS Verticals Operator Manual User Manual

Page 17: Drivable vertical lifts) -9

SECTION 2 - SERVICE PROCEDURES - LOAD SENSING SYSTEM

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– JLG Lift –

2-9

2.7 TROUBLESHOOTING

The following tables are furnished to provide possible res-
olutions for common Load Sensing System difficulties.
The wiring connectors and pins referenced in these trou-
bleshooting tables can be located on the electrical wiring
diagrams on the pages following these tables.

Table 2-4. Troubleshooting - Machine Indicates (Possible False) Platform Overload Condition -

(Manually Propelled Vertical Lifts)

Check For These Obvious Conditions First:

• Is the LSS platform mounting system secure and undamaged and all mounting arm joints working smoothly.
• Damaged or loose connectors or wires to LSS components.

STEP

ACTION

SPEC

YES

Is platform load at or below the maximum rated platform capacity?

See Capacity

Decal on Machine

Go to Step 2

Reduce Platform

Load

Perform adjustment procedures (Section 2.2, LSS - Setup And

Adjustment). Reload platform to rated capacity, is system still indi-

cating an overload condition?

–

Go to Step 3

Done

Set up and power machine on. Check voltage at Timing Module - J1

connector - Pin 3. Is voltage up to spec?

12V

Replace Timing

Module

Go to Step 4

Check continuity between Timing Module J1 - Pin 3 and Pin 22 on

the Limit Switch. Is there continuity?

Go to Step 5

Repair or Replace

Wiring

At the Limit Switch check voltage on Pin 21. Is voltage up to spec?

12V

Replace Limit

Switch

Go to Step 6

At the Limit Switch, check Pin 21 connector for loose or damaged

condition. Is connector loose or damaged?

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