Hobart 6921A-12 Manuals

Manuals and User Guides for Hobart 6921A-12. We have 1 Hobart 6921A-12 manual available for free PDF download: Operation And Maintenance Manual

Hobart 6921A-12 Operation And Maintenance Manual

Hobart 6921A-12 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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