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Grasshopper
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721
Grasshopper 721 User Manual
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THE GRASSHOPPER COMP
ANY
Moundridge, Kansas 67107 U.S.A.
PHONE (620) 345-8621
F
AX (620) 345-2301
PRICE $12.00
A
LL
MODELS
WITH
MODULAR
WIRING
S
ERIAL
NUMBERS
310000
THROUGH
469999
Rev. 01-95
Form 172110
Printed in U.S.A.
SER
VICE MANUAL
E
LECTRICAL
TROUBLESHOOTING
V
OLUME
1
2
Table of Contents
Service Manual
1
Introduction
2
Table of Contents
3
Symbols Used on Wiring Diagrams
5
Switch Functions
6
Switch Functions
7
Troubleshooting Control Relays
8
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
11
Model 612, 614, 616, 718, 718K and 720K
11
Model 720 (Onan), 718D, 721D, 721 and 725
12
Battery Charging System
13
Model 718 (Briggs & Stratton Twin-II Engine)
13
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
18
Model 612, 614, and 616 (Briggs & Stratton Engines)
18
Engine will Not Crank
19
Model 718 (Briggs & Stratton Vanguard Engines)
20
Engine will Not Crank
20
Engine will Not Crank
21
Model 718K (Kohler Magnum Engine)
22
Engine will Not Crank
22
Engine will Not Crank
23
Model 718K and 720K (Kohler Command Engines)
24
Engine will Not Crank
25
Model 720 (Onan Engine)
26
Engine will Not Crank
26
Model 718D, 721, 721D, and 725 (All Kubota Engines)
28
Engine will Not Crank
28
Engine will Not Crank
29
Engine will Crank, but Not Start
30
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
34
When Levers Are Brought in or Pto Switch Is Engaged
34
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
Engine Starts, but dies When Key Switch Is Released
38
Model 718D and 721D (Kubota Diesel Engines)
38
Troubleshooting Pto Clutch
40
Model 612, 614, 616, 718, 718K and 720K
40
Model 718D, 720, 721, 721D and 725
41
1994 Model Updates
42
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Grasshopper 721 Specifications
General
Transmission
Hydrostatic
Drive
2WD
Cutting Width
61 in (155 cm)
Deck Material
Steel
Warranty
3 years
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