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721
Grasshopper 721 User Manual
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29
Ye
s
No
No
Ye
s
Ye
s
No
Key switch is
now OFF
.
Yo
u
are now testing
a ground circuit.
All tests will be
to the battery
positive (hot)
side.
Remove relay
'B'. (Note: Relay
'B' is the relay
with 3 blue wires
and 1 yellow wire
in plug.)
Does the yellow
wire on plug of
relay 'B' show
ground when
tested?
Do both yellow
wires on left
steering switch
test grounded?
Before replacing
steering switch,
check
adjustment. If it
does not click
when steering
levers are
moved in and
out adjust
switch.
Replace left
steering switch.
continued
A
Replace
relay 'B'.
Do both yellow
wires on right
steering switch
test grounded?
Before replacing
steering switch,
check
adjustment. If it
does not click
when steering
levers are
moved in and
out adjust
switch.
Replace right
steering switch.
Replace PTO
switch.
MODEL 718D, 721, 721D, and
725
(All Kubota engines)
ENGINE WILL NOT CRANK
Figure 22
Figure 23
87
86
85
30
PTO
7.
5
7.
5
REG.
30
15
MA
IN
30
IG
N
.
STA
RT
A
D
E
G
F
J
B
C
I
H
28
30
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
Brand
Grasshopper
Model
721
Category
Lawn Mower
Language
English
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