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INTRODUCTION 2

SYMBOLS USED ON WIRING DIAGRAMS 5

SWITCH FUNCTIONS 6-7

TROUBLESHOOTING CONTROL RELAYS

Model 720, 721, and 725 ........................................................................................... 8

Model 718D and 721D............................................................................................... 8

Control relay - Model 720, 718D, 721, 721D, and 725 .............................................. 9

Circuit board diode problems - Model 720, 718D, 721, 721D, and 725..................... 9

FUSE BLOCK DIAGRAMS 10

TESTING SAFETY SYSTEM FOR PROPER OPERATION

Model 612, 614, 616, 718, 718K and 720K ............................................................. 11

Model 720 (Onan), 718D, 721D, 721 and 725 ........................................................ 12

BATTERY CHARGING SYSTEM

Model 718 (Briggs & Stratton Twin-II engine) .......................................................... 13

Model 612, 614, 616, and 718 (Briggs & Stratton Vanguard engines) and

Model 718K and 720K (Kohler Magnum & Command engines) .............................. 14

Model 720 (Onan engine) ........................................................................................ 15

Model 718D, 721, 721D, and 725 (All Kubota engines) .......................................... 16

ENGINE WILL NOT CRANK

Model 612, 614, and 616 (Briggs & Stratton engines)........................................ 18-19

Model 718 (Briggs & Stratton Vanguard engines) .............................................. 20-21

Model 718K (Kohler Magnum engine) ................................................................ 22-23

Model 718K and 720K (Kohler Command engines) ........................................... 24-25

Model 720 (Onan engine) ................................................................................... 26-27

Model 718D, 721, 721D, and 725 (All Kubota engines) ..................................... 28-29

ENGINE WILL CRANK, BUT NOT START

Model 612, 614, 616, 718, 718K, and 720K (All engines) ....................................... 30

Model 720 (Onan engine) ........................................................................................ 31

Model 721 and 725 (Kubota gasoline engines) ....................................................... 32

Model 718D and 721D (Kubota diesel engines) ...................................................... 33

ENGINE STARTS, BUT DIES

WHEN LEVERS ARE BROUGHT IN OR PTO SWITCH IS ENGAGED

Model 612, 614, 616 and 718 .................................................................................. 34

Model 718K and 720K ............................................................................................. 35

Model 720 (Onan engine) ........................................................................................ 36

Model 718D, 721, 721D, and 725 (All Kubota engines) .......................................... 37

(continued)

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Grasshopper 721D User Manual

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