2-30
!
1. Refer to Hydraulic Schematic and System Description to gain a thorough understanding of the capacity alert
system before proceeding with any maintenance.
2. System adjustment must be checked every three months for accuracy. Refer to the preceding section on Sys-
tem Adjustment.
3. Always be sure the boom is adequately supported and no hydraulic pressure remains in the lines before the pilot
pressure line fittings are loosened.
12v Across Compensating
Pressure Switch
Has Overload Condition
been Eliminated
Eliminate Overload
Do Crane Functions Boom Down,
Telescope Out, Winch up work
Problem Solved
Boom Lift Cylinder
Fully Extended
Actuate Momentary Key Switch
and Boom Down 5
o
with No Load
Crane Functions Boom Down,
Telescope Out, Winch up work
Fuse OK
Replace Fuse
12v to Compensating
Pressure Switch
Replace Wiring
Problem Solved
Problem Solved
12v to Solenoid
Resistance Across
Solenoid Coil
Replace
Solenoid Valve
Trouble Shoot
Wiring
Sticking Spool
Clean or Replace
Check Valves Sticking
Clean or Replace
Some Functions
Still Don't Work
No Yes
No Yes
No Yes
Yes No
No Yes
Yes No
Yes No
Yes No
Overload Trips and
will not Reset
Functions Operate
12 Ohm
No Yes
Lower Loadline Weight
Loadline Downhaul Weight Lifting
Anti-Two-Block Weight
Reference Only
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