Toro Greensmaster 3120 Service Manual page 193

Cutting Unit Operating Problems (continued)
Problem
Cutting units run (but should not) when raised.
Cutting units do not run when lowered with the function
control lever in the MOW position.
Cutting units will not raise.
Cutting units will not lower.
Greensmaster 3120
17230SL Rev C
Possible Causes
Joystick relay (K3) is faulty.
Mow relay (K4) is faulty.
Mow switch is out of adjustment or faulty.
A hydraulic problem exists; refer to
System (page 4–1).
Wiring to run/mow/backlap circuits components is loose,
corroded or damaged; refer to Electrical Schematics and
Wire Harness Drawings/Diagrams in
Fuse block or fuse is faulty.
Solenoid coil S1 (machines without backlap) or S1R1 (units
with backlap) is faulty.
Mow switch and/or mow relay (K4) is faulty.
Raise or lower switch and/or joystick relay (K3) is faulty.
A hydraulic problem exists; refer to
System (page 4–1).
Wiring to raise circuit components is loose, corroded or
damaged; refer to Electrical Schematics and Wire Harness
Drawings/Diagrams in
Fuse block or fuse is faulty.
Diode D3 is open.
Raise switch is faulty.
Raise relay (K6) is faulty.
Solenoid coil S3 and/or S2 is faulty.
A hydraulic problem exists; refer to
System (page 4–1).
Wiring to lower circuit components is loose, corroded or
damaged; refer to Electrical Schematics and Wire Harness
Drawings/Diagrams in
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.
Page 5–7
Chapter 4: Hydraulic
Appendix A (page
Chapter 4: Hydraulic
Appendix A (page A–1).
Chapter 4: Hydraulic
Appendix A (page A–1).
Electrical System: Troubleshooting
A–1).