Toro Multi Pro 5800 Service Manual page 64

One of the spray booms does not
raise or lower.
Neither of the spray booms will raise
or lower.
One of the spray booms will not re-
main in the raised position.
NOTE: Lift cylinders cannot provide
an absolutely perfect seal. A spray
boom may eventually lower during
storage.
Hydraulic System
Affected spray boom pivot is worn, binding or damaged.
Boom lift control manifold solenoid coil (S2 or S3) or circuit wiring
for affected boom has electrical problem (see Chapter 5 -- Electrical
System).
Boom lift control manifold solenoid valve for affected boom (S2 or
S3) is sticking or damaged.
Boom lift control manifold check valve for affected boom (CV1 or
CV2) is sticking or damaged.
Boom lift control manifold orifice for affected boom is plugged or
damaged.
Lift cylinder is worn or damaged.
Oil level in reservoir is low.
Boom lift control manifold solenoid coil S1 or circuit wiring has elec-
trical problem (see Chapter 5 -- Electrical System).
Boom lift control manifold solenoid valve S1 is sticking or damaged.
Check valve in steering control valve is sticking, worn or damaged.
Relief valve in gear pump is faulty.
Rear gear pump section is worn or damaged (steering circuit af-
fected as well).
Boom lift control manifold check valve for affected boom (CV1 or
CV2) is sticking or damaged.
Cartridge valve seals are leaking in boom lift control manifold.
Lift cylinder for affected boom leaks internally.
Hydraulic hoses to lift cylinder for affected boom are incorrectly
installed.
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