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6921-8
Hobart 6921-8 Manuals
Manuals and User Guides for Hobart 6921-8. We have
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Hobart 6921-8 manual available for free PDF download: Operation And Maintenance Manual
Hobart 6921-8 Operation And Maintenance Manual (262 pages)
Brand:
Hobart
| Category:
Portable Generator
| Size: 7.49 MB
Table of Contents
Table of Contents
11
General
19
Section 1. Description
19
Canopy
24
Electric Governor
24
Optional Equipment
24
Protective Monitor
24
Pull-Out Trays
24
Quick Start Kit
24
Special Features
24
Test Circuitry
24
Transformer-Rectifiers (Optional)
24
Voltage Regulator
24
Basic Engine
25
Engine Manufacturer's Equipment
25
Engine, Generator and Controls Assembly
25
Hobart Engine Equipment
25
(A) Magnetic Pickup
26
(A) Resistors
29
(B) Generator Output Monitors (Meters) 1-1
29
Control Box Assembly
29
(A) Sensing Modules
30
(E) Tray
30
(F) Manual Voltage Control
30
(G) Excitation-Deenergization Relay
30
Protective Relay Tray (Figure 9)
30
(B) Memory and Time Delay Module
32
(C) Indicating Lights
32
(D) Plug Interlock Relay
32
(E) Test Bank Switch
32
(F) Resistor
32
(G) Fuse-Interlock Relay
32
(H) Connector
32
(J) Auxiliary Underfrequency Relay
32
(D) Hourmeter
36
(F) Cold Weather Starting Aid
36
Control (Optional)
36
Engine Control Panel (Fig. 10) 1-1
36
Voltage Regulator 1-1
37
(A) Ammeter Current Transformers
38
(B) Line-Drop Current Transformers
38
Components (See Fig. 12)
38
Controls
38
Current Transformers
38
Power Module Panel Assembly
38
Protection
38
(C) Overload Current Transformers
39
Overload Module
40
Rectifier
40
Description (See Fig. 14)
41
Test Box
41
Theory of Operation
41
Dual Output Machine
42
General
45
Inspection/Check
45
Preparation for Use
45
Section 2. Preparation for Use, Storage, or Shipping
45
Installing Output Cables
46
General
47
Preparation for Storage
47
Temporary Storage
47
Long Time Storage (over 30 Days)
48
Preparation for Shipment
48
General
49
Normal Engine Starting Procedures
49
Operating the Generator Set
49
Pre-Start Inspection
49
Section 3. Operation
49
Cold Weather Engine Starting Procedures
52
Preparation for Power Delivery (Normal Automatic Voltage Control)
52
Power Delivery (Automatic Voltage Control)
53
Direct Current Power Delivery
54
Discontinue Power Delivery
54
Power Delivery (Manual Voltage Control)
54
Preparation for Power Delivery
54
Stopping the Engine
54
Transformer-Rectifier Operation
54
Simultaneous 112-V DC and 115-V AC
55
Simultaneous 28.5-V DC and
55
Simultaneous Operation of 28.5-V T-R's
55
Test Box Operation
55
2 Output Operation
56
Power Delivery
56
Chapter 2. Servicing
59
Section 1. Maintenance
59
General
59
Inspection
59
Lubrication
59
AC Generator
59
Generator Controls
59
Trailer
59
Engine
63
Engine Accessories
65
Air Cleaner Service
66
Cartridge Removal
66
Cartridge Installation
67
Engine Fuel
67
Quality
67
Generator Maintenance
67
Cleaning
67
Adjustment
67
Drive Belts
67
Fan Belts
67
Check Belt Tension
67
Adjusting Alternator Belt Tension
68
Belt Replacement
68
Service Helps
68
Wiring
68
Control Box Trays
68
Generator Exciter
69
Engine Control Panel
69
Transformer-Rectifier Maintenance
70
Section 2. Inspection / Check
71
General
71
Engine
71
Fuel (See Fig. 1 for Time Schedules)
71
Lubrication
71
V-Belts
71
Exhaust System
71
Electrical System (12-V DC)
71
Lights
71
Fuses
71
Wiring and Connections
74
Electrical System (115-V AC)
74
Monitoring Instruments
74
Indicating Lights
74
Protective Modules
74
Wiring Connections
74
Inspection of Transformer-Rectifiers
74
Section 3. Adjustment/Test
75
General
75
Generator Set Test
75
Pre-Operation Test Procedures
75
(A) Flashing Exciter Field Using Test Box
75
(B) Flashing Exciter Field Without Test Box
78
Operational Test Procedures
79
Generator Set Adjustment
83
Generator Adjustment
83
Generator Control Adjustments
83
Adjust Manual Voltage Control, Variable Resistor
83
Basic Engine Adjustments
83
Alternator and Fan Belt Adjustment
84
Electric Governor System Adjustment
84
Generator and Exciter Test
89
Diode Test
89
Test and Adjustment of Transformer-Rectifiers
90
Additional Tests for Dual Output Units
90
Chapter 3. Troubleshooting
93
Section 1. Troubleshooting Procedures
93
General
93
Description
93
Use of the Troubleshooting Chart
93
Equipment for Troubleshooting
94
Parts Replacement
94
Test Values
94
Checking Connections and Leads
95
Electric Governor Trouble Shooting
95
Engine Trouble Shooting Procedures
95
General
95
Locating a Misfiring Cylinder
95
Checking Compression Pressure
96
Causes of Low Cylinder Pressure
96
Fuel Flow Test (See Fig. 7)
97
Illustrations
97
Troubleshooting Transformer-Rectifiers (T-Rs)
97
Section 1. Introduction
119
Parts List Form
119
HOBART PART NUMBER" Column
119
NOMENCLATURE" Column
120
EFF" (Effective) Column
120
UNITS PER ASSEMBLY" Column
120
Section 2. Manufacturer'scodes
121
Explanation of Manufacturer's (Vendor) Code List
121
Section 3. Parts List
125
Explanation of Parts List Arrangement
125
Symbols and Abbreviations
125
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