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Jacobsen
Lawn Mower
AR-3
Jacobsen AR-3 User Manual
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4-18
4181384 First Edition
ELECTRICAL
4
P
ower Cir
cuit Schematic
See Figures
4-8 t
hrough 4-13.
Figure
4-8
TN1134
Unswitched Power Circui
t
Switched Power Circu
it
Ground Circuit
G
U
3
87
87A
85
86
30
4
32
51
(1)
(7)
Grn
Grn
Grn
Wht
Wht
Wht/Red
Brn/Red
Brn/Red
Brn/Red
Wht Yel
Wht/Yel
Wht/Blu
Blk
Blk
Brn/
Red
Brn/
Red
Brn/
Blu
Brn/Red
Brn/Red
Wht/
Red
Wht/
Grn
Wht/
Grn
Blk/
Brn
Wht/
Yel
Wht/
Yel
Wht/
Yel
Wht/
Yel
Grn
Brn
Brn
Brn
Brn/Wht
Brn/Wht
Brn
Brn
Brn
Brn
Blk
Brn
Brn
Red
Red
Blk
Blk
Brn/Yel
Brn/Yel
Wht/Blu
Wht/Blu
Blk
Blk
Brn/Yel
Blk
Blk
Blk
Brn
Brn
Brn
Brn/Wht
Brn/
Wht
Brn/
Red
Brn/
Red
Blk
Brn/
Yel
Brn/
Yel
Brn/
Yel
(6)
Yel/
Blk
Yel
(3)
(1)
(2)
(3)
(4)
(1)
(2)
(3)
(4)
(5)
(6)
M
M
Off
Heat
Run
Wht
Wh
t
Blk/Brn
Blk/Brn
Start
30
AC
19
50
Brn
Brn
+
-
X3
X1
X4
X4
(6)
(5)
X2
X2
M1
Starter
Motor
M2
Fuel
Pump
K2
Glow
Plug
Relay
K1
Start
Relay
R1
Glow
Plugs
H1
Glow
Plug
Wait
Light
F6
15A
Fuse
F7
7.5A
Fuse
F11
40A
Fuse
X8
Jump
Start
Adapter
S1
Key
Switch
G1
Battery
G2
Alternat
or
X5
Cab
V1
Diode
Module
F12
40A
Fuse
F5
2A
Fuse
A2
Glow
Plug
Timer
Blk
Power
Connector
74
76
Table of Contents
Table of Contents
6
Chapter 1
10
Introduction
10
Prepare for the Job
10
Safety Label Locations
10
Safety Notices
10
Safety Labels EC
13
Inspect Safety Labels
14
Keep Work Area Clean
14
Keep Work Area Well Ventilated
14
Park Mower Safely
14
Use Proper Eye and Face Protection
14
Support Machine Securely
15
Use Compressed Air and Air Tools Safely
15
Use Lifting Equipment Safely
15
Handle Fuel Safely
16
Service Tires Safely
16
Store Volatile and Hazardous Materials Safely
16
Handle Chemical Products Safely
17
Service Cooling System Safely
17
Service Hydraulic System Safety
17
Dispose of Waste Materials Safely
18
Service Electrical Components Safely
18
Chapter 3 Engine
34
General Engine Specifications
35
Specifications
35
Repair Specifications
36
Component Location
37
Kubota D1105-E
37
Kubota D1105-T
39
Repair
41
Fan Belt
41
Air Cleaner Assembly
41
Muffler
42
Exhaust Manifold-Naturally Aspirated Engine
44
Exhaust Manifold and Turbocharger
45
Radiator/Hydraulic Oil Cooler
46
Thermostat
49
Throttle Cable and Control Lever
50
Fuel Pump-Naturally Aspirated Engine
51
Fuel Pump-Turbocharged Engine
52
Engine
52
Engine Service
57
Chapter 4 Electrical
58
Repair Specifications
61
Specifications
61
Test and Adjustment Specifications
61
Fuse Identification
62
Theory and Diagnostic Information
63
Electrical Component Symbols
63
Electrical Schematic Component Identification
66
Electrical Schematic
67
Theory of Operation and Sub Circuit Schematics
74
Power Circuit-Theory of Operation
74
Power Circuit Schematic
75
Charging Circuit-Theory of Operation
81
Charging Circuit Schematic
82
Glow Plug Circuit-Theory of Operation
83
Glow Plug Circuit Schematic
84
Start Circuit-Theory of Operation
86
Start Circuit Schematic
88
Run Circuit-Theory of Operation
90
Run Circuit Schematic-On Seat
91
Run Circuit Schematic-Off Seat
92
Raise/Lower Circuit-Theory of Operation
93
Raise/Lower Circuit Schematic
94
Mow Circuit-Theory of Operation
95
Mow Circuit Schematic
96
Park Brake Circuit-Theory of Operation
97
Park Brake Circuit Schematic-Brake Released
98
Park Brake Circuit Schematic-Brake Locked
99
Backlap Circuit Operation (Model TR-3)-Theory of Operation
100
Backlap Circuit Schematic (Model TR-3)
101
Weight Transfer Circuit-Theory of Operation
102
Weight Transfer Circuit Schematic
103
Instrumentation Circuit-Theory of Operation
104
Instrumentation Circuit Schematic
105
Work Lights Circuit-Theory of Operation
106
Work Lights Circuit Schematic
106
Troubleshooting
107
Power Circuit
107
Charging Circuit
108
Glow Plug Circuit
109
Start Circuit
110
Run Circuit
111
Park Brake Circuit
111
Raise/Lower Circuit
112
Mow Circuit
113
Backlap Circuit-Model TR-3
113
Weight Transfer Circuit
114
Instrumentation Circuit
114
Work Lights Circuit
116
General Information
117
Component Testing
117
Electrical System and Component Testing
117
Fuse Test
118
Relay Tests
119
Key Switch Test
120
Brake Safety Switch Test
121
Joystick Test
121
Traction Pedal Neutral Switch Test
122
Seat Switch Test
122
Rocker Switch Test
123
Park Brake Switch Test
124
Diode Module Test
124
Solenoid Test
125
Fuel Shutoff Solenoid Test
126
Backlap Switch Test
126
Electrical
127
Engine Oil Pressure Switch Test
127
Fuel Level Sender Test
128
Engine Components
128
Repair
129
Battery and Battery Tray
129
Alternator
131
Starter Motor
132
Instrument Panel
133
Fuses
134
Diode Module
135
Start Relay
135
Glow Plug Relay
136
Key Switch
136
Rocker Switches
137
Indicator Lamps
138
Brake Safety Switch
139
Joystick
139
Control Module
140
Multi-Function Gauge
140
Seat Switch
141
Traction Pedal Neutral Switch
141
Solenoid Coils
142
Fuel Shutoff Solenoid
143
Backlap Switch
143
Hydraulic Oil Filter Switch
144
Engine Oil Pressure Switch
144
Engine Temperature Switch
145
Fuel Level Sender
146
Alarm
146
Glow Plug Timer
146
Engine
127
Chapter 5 Hydrostatic Power Train
148
Hydrostatic Power Train
148
Specifications
149
Repair Specifications
149
Test and Adjustment Specifications
149
Component Location
150
Theory of Operation and Sub-Circuit Schematics
151
Traction Circuit Forward Schematic and Theory of Operation
151
Traction Circuit-Forward Schematic
151
Traction Circuit Reverse Schematic and Theory of Operation
153
Traction Circuit-Reverse Schematic
153
Troubleshooting
155
Field Test Procedures
157
Preliminary Checks
157
Charge Pump Test
157
Traction System Test
157
Rear Wheel Motor Test
157
Instrument Test Procedures
158
Instrument Test Overview
158
Charge Pressure Test
158
Traction System Test
159
Traction Pump Tests
161
Wheel Motors Test
163
Transmission Neutral Adjustment
165
Repair
169
Traction Pump
169
Front Wheel Motor
172
Rear Wheel Motor
183
Chapter 6 Hydraulics
192
Hydraulics
192
Component Location-TR-3
198
Hydraulic Schematic-AR-3 Model AR30001
201
Hydraulic Schematic-AR-3 Model AR30002
203
Hydraulic Schematic-TR-3
205
Theory of Operation and Diagnostic Information
207
Steering Circuit and Theory of Operation
207
Steering Circuit Schematic
208
Raise Circuit Schematic and Theory of Operation
209
Raise Circuit Schematic
210
Lower Circuit Schematic and Theory of Operation
211
Lower Circuit Schematic
212
Weight Transfer Circuit Schematic and Theory of Operation
213
Weight Transfer Circuit Schematic
213
Mow Circuit Schematic and Theory of Operation
215
Mow Circuit Schematic
216
Backlap Circuit Schematic and Theory of Operation (TR-3 Only)
217
Backlap Circuit Schematic
218
Field Test Procedures
219
Lift Cylinder Leakage Test
219
Power Steering Circuit Test
219
Cutting Unit Motor Test
220
Instrument Test Procedures
220
Instrument Test Overview
220
Cutting Unit/Charge Pump System Test
221
Cutting Unit/Charge Pump Test
222
Mow/Brake Valve Tests
224
Adjust Mow/Brake Valve Relief Pressure
225
Cutting Unit Motors Test
226
Lift/Steer System Relief Valve Pressure Test
230
Lift System Test
231
Lift/Steer Pump Test
232
Lift Valve Leakage Test
233
Repair
235
Tandem Pump
235
Cutting Unit Motor
237
Lift Valve
237
Flushing Valve
239
Mow/Brake Valve
241
Brake Release Valve
243
Hydraulic Filter
244
Hydraulic Manifold
244
Backlap Valve
245
Lift Cylinder
245
Hydraulic Oil Cooler
248
Hydraulic Oil Tank
248
Chapter 7 Steering
250
Steering
250
Specifications
252
Component Location
253
Tests and Adjustments
254
Steering Leakage Test
254
Steer System Relief Valve Pressure Test
255
Repair
256
Steering Wheel
256
Steering Valve
256
Steering Tower
258
Steering Cylinder
259
Rear Wheel Support
262
Chapter 8 Cutting Units
266
Specifications
267
Component Location
268
Troubleshooting
270
Mechanical Troubleshooting-AR-3
270
Quality of Cut Troubleshooting-AR-3
271
Rotary Cutting Unit
290
Deck Drive Motor
290
Cutter Blade
293
Front Deck Yoke
294
Rear Deck Yoke
294
Deck Caster Wheels
295
Mower Deck
296
Deck Roller
296
Reel Drive Motor
298
Cutting Unit
301
Bedknife Shoe
301
Bedknife
302
Reel Bearing Housing Assemblies
303
Reel Blade
306
Front Roller
307
Rear Roller
309
Yoke Assembly
310
Accessories and Miscellaneous Repair
312
Component Location
314
Repair
315
Canopy
315
Chapter 9
315
Ops
315
Fuel Tank
317
Hood
317
Traction Pedal
321
Traction Pedal Damper
323
Seat and Mounting Plate
327
Rear Wheel
329
Work Light
329
Front Wheels
330
5
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Jacobsen AR-3 Specifications
General
Brand
Jacobsen
Model
AR-3
Category
Lawn Mower
Language
English
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