Toro Multi Pro 1750 Service Manual page 66

Problem
Neither of the spray booms will raise or lower.
One of the spray booms will not remain in the raised
position.
NOTE: Lift cylinders cannot provide an absolutely
perfect seal. A spray boom may eventually lower
during storage.
Hydraulic System
Possible Cause
Oil level in transaxle is incorrect.
Boom lift control manifold solenoid coil S1 or circuit
wiring has electrical problem (see Chapter 5 −
Electrical System in this manual).
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 hydraulic pump is faulty.
Hydraulic pump is worn or damaged (steering circuit
affected as well).
Boom lift control manifold check valve for affected
boom (PC1 or PC2) 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 control cylinder for affected
boom are incorrectly installed.
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