Lull 6K Service Manual - Manual (Page 560)

Transmission
8-12 Service Manual — Models 644B, 6K, 844C, 8K, 1044C, 10K
g. Ignition Relay (37383X):
i. Check resistance between pin 86 and pin 85: 76 W
ii. Check ground connection to pin 85 through the horn button
ground.
h. Ignition switch.
i. Circuit breaker.
j. Battery and cable connections.
DW-3 Speed Range/Direction Signal Test for a 4WG-100 Transmission
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.
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. Probe colored wires from shifter at the front of the sealed connectors.
Test all direction and speed range signal combinations shown in
Fig. 8-5. If no power is present at Red or Violet wires, proceed to
Step 7. If other discrepancies are found, contact the JLG Service
Department
Note:Use a 12V test light or a multimeter.
6. If no discrepancies are found, shifter integrity is OK. See “DW-3
Signals at Transmission Test” on page 8-14 for further test procedures.