JLG sky trak mmv Service Manual page 531

Before troubleshooting any
electrical circuit, ALWAYS
begin by checking the
following:
1. All connections relating
to circuit are clean and
tight
Model MMV Rev. 12/04
With steer select switch
in crab steer mode,
only 2 wheel steering
is active.
Check 5.0 amp steer
select fuse.
If OK
Check for battery voltage at
circuit 18B (GRY/GRN)
at steer select valve mounted
on the hydraulic tank. Check
ground connections.
If OK
Replace steer select valve.
Electrical System
Check circuit 18 and 18B
from steer select solenoid to
Not
OK
steer select switch. Check for
open or short to ground.
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