Lift And Lower Switch Check - Yale 524150797 Maintenance Manual

General Maintenance and Diagnostic Data

Lift and Lower Switch Check

1. Operate lift/lower switch.
Does status code display if truck does not re-
spond to lift and lower command?
YES- Proceed to status code description section
within this manual to address the status code.
NO- Inspect lift and lower switches at tiller head.
Lower Function Fault
If the lower function is inoperative and no code has
been displayed, perform the following troubleshooting
procedures:
1. Open tiller head assembly and inspect tiller card.
Are lower switches connected to tiller card con-
nectors JP12 and JP15?
YES- Proceed to Step 2.
NO- Connect switches.
2. Disconnect JP12 and connect meter probes at
switch connector sockets (blue and black leads)
and operate switch.
Is resistance <1 ohm?
YES- Proceed to Step 3.
NO- Replace faulty switch.
3. Measure resistance of tiller card switch JP12, pin
1 and pin 3.
Is resistance 2.7K ohms ± 0.27K ohms
YES- Proceed to Step 4.
NO- Replace faulty switch.
4. Measure resistance of tiller card switch JP15, pin
1 and pin 2.
Is resistance 1.4K ohms ± 0.14K ohms
Check the Service Manual section in Yale Axcess Online for possible updates and check pertinent Bulletins
9030-03-6
YES- Suspect faulty tiller card.
NO- Replace faulty switch.
Lift Function Fault
If the lift function is inoperative and no code has been
displayed, perform the following troubleshooting pro-
cedures:
1. Open tiller head assembly and inspect tiller card.
Are lower switches connected to tiller card con-
nectors JP10 and JP14?
YES- Proceed to Step 2.
NO- Connect switches.
2. Disconnect JP10 and connect meter probes at
switch connector sockets (blue and black leads)
and operate switch.
Is resistance <1 ohm?
YES- Proceed to Step 3.
NO- Replace faulty switch.
3. Measure resistance of tiller card switch JP10, pin
1 and pin 3.
Is resistance 2.7K ohms ± 0.27K ohms
YES- Proceed to Step 4
NO- Replace faulty switch.
4. Measure resistance of tiller card switch JP14, pin
1 and pin 2.
Is resistance 1.4K ohms ± 0.14K ohms
YES- Suspect faulty tiller card.
NO- Replace faulty switch.
ELECTRICAL SYSTEM