Lull 6K Service Manual - Manual (Page 556)

Transmission
8-8 Service Manual — Models 644B, 6K, 844C, 8K, 1044C, 10K
2. Make sure the parking brake is disengaged and the service brake is
not applied.
3. Transmission declutch switch must be in “OFF” position.
4. With the engine off, turn ignition switch to the “ON” position. Do not
start the engine.
5. Wait five seconds before selecting a direction and speed range. This
allows the EST-19 to perform self diagnostic checks.
6. Probe colored wires from shifter at the front of the sealed connectors.
Test all direction and speed range signal combinations shown in
Fig. 8-2. If other discrepancies are found, contact the JLG Service
Department.
Note:Use a 12V test light or a multimeter.
Fig. 8-2: DW-2 Signal/Wire Combinations
DW-2 Signals from EST-19 to Transmission Solenoid Assembly Test
1. Park the machine on level ground, lower the boom, and block the
wheels.
2. Make sure the parking brake is disengaged and the service brake is
not applied.
E1012