JLG TOUCAN 861 Service Manual page 33

III-3
Diag III
Mast and jib low ering impossible
from the platform controls
(if one descent only is affected
refer to Diag VII or Diag IX)
Check the condition of the
slack chain default led on UCB
Measure the voltage at contact n°1 on
CR10 (chain slack connector towards UCB).
Measure the voltage at contact n°2 on
CR10 (chain slack connector towards UCB).
Measure the voltage at terminal block
UCB -wire rep.19-
Measure the voltage at contact n°1 on
CR4 (connect. Slack chain LCB).
Measure the voltage at contact n°2 on
CR4 (chain slack connector towards UCB).
Check / repair the connection
wire # 21 in the loom or between
CR4 and this connection.
Measure voltage at contact n°1 of
CR3 (connector of mast 1 loom).
Measure voltage at the terminals of one
of the coils for lowering autorisation.
See JLG Product Support.
Models
Toucan 861
Updated 04-06
BREAKDOWN
Lit
24V
24V
24V
24V
24V
Off
24V
24V
Preliminary verifications :
All other functions are operational.
The machine is on flat and horizontal ground.
No chain is broken.
No chain is slack.
Check / repair the connection of
wire rep. 30 in the UCB.
< 24V Check / repair the link cable
UCB / CR10.
Check / repair the connector - see § 3.3.2 -
Check / repair the link cable
< 24V CR10 / sensors and inter-sensors.
Check / repair the sensor connections.
Check / replace the sensor contacts.
Check / repair the connector - see § 3.3.2 -
Check / repair the assembly of sensors
and actuators.
< 24V Check / repair the link cable
UCB / CR10.
Check / repair the connections on block
< 24V Check / repair the link cable
UCB / LCB.
Check / repair the connector - see § 3.3.2 -
< 24V Check / repair the link cable
CR10 / sensors and inter-sensors.
Check / repair the sensor connections.
Check / replace the sensor contacts.
Check / repair the connector - see § 3.3.2 -
Check / repair the assembly of sensors
and actuators.
Check / repair the looms
PC0217 & PC0191.
< 24V Check / repair the connectors
CR1 and CR3 - see § 3.3.2 -
Check / repair the link cable
< 24V coils / LCB.
Check / repair the connectors
CR1 and CR3 - see § 3.3.2 -
III-3
33