Toro Greensmaster 3150 Service Manual page 146

Cutting Unit Operating Problems (Continued)
Problem
Cutting units will not lower.
Electrical System
Possible Causes
Wiring to lower circuit components is loose, corroded
or damaged (see Electrical Schematic and Circuit
Diagrams in Chapter 9 -- Foldout Drawings).
Fuse block or fuse is faulty.
Diode D2 is open.
Raise switch is faulty.
Lower switch is faulty.
Joystick relay (K3) is faulty.
Lower relay (K5) is faulty.
6 second delay timer is faulty.
Solenoid coil S2 or S4 is faulty.
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