Hobart 6921 Series Operation And Maintenance Manual page 16

OM-2040 / Operation and Maintenance Manual
90D20 / Generator Sets
SUBJECT
E. Electric Governor System Adjustment . . . . . . . 2-3 . . . . . . . . . . . . . . . . . 10
(1) Actuator linkage adjustment
(2) Magnetic pickup adjustment
(3) Governor Control Unit Adjustment
(4) Magnetic pickup signal
4. Generator and Exciter Test
5. Diode Test
6. Test and Adjustment of Transformer-
Rectifiers
7. Additional Tests for Dual Output Units
CHAPTER 3. TROUBLESHOOTING
SECTION 1. TROUBLE SHOOTING
PROCEDURES
1. General
2. Trouble Shooting Chart (Figure 2)
A. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 . . . . . . . . . . . . . . . . . . 1
B. Use of the Trouble Shooting Chart . . . . . . . . . . 3-1 . . . . . . . . . . . . . . . . . . 1
3. Equipment for Troubleshooting
4. Safety - WARNING:
5. Parts Replacement
6. Test Values
7. Checking Connections and Leads
8. Electric Governor Trouble Shooting
9. Engine Trouble Shooting Procedures
A. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 . . . . . . . . . . . . . . . . . . 3
B. Locating a Misfiring Cylinder . . . . . . . . . . . . . . . 3-1 . . . . . . . . . . . . . . . . . . 3
C. Checking Compression Pressure . . . . . . . . . . . 3-1 . . . . . . . . . . . . . . . . . . 4
D. Interpretation of Compression
Pressure Records . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 . . . . . . . . . . . . . . . . . . 4
E. Causes of Low Cylinder Pressure . . . . . . . . . . . 3-1 . . . . . . . . . . . . . . . . . . 5
F. Fuel Flow Test (see Fig. 7) . . . . . . . . . . . . . . . . . 3-1 . . . . . . . . . . . . . . . . . . 4
10.Illustrations
11. Troubleshooting Transformer-
Table of Contents
Page 6
Rectifiers (T-R's)
CHAPTER/SECTION
2-3
2-3
2-3
2-3
2-3
2-3
2-3
2-3
3-1
3-1
3-1
3-1
3-1
3-1
3-1
3-1
3-1
3-1
3-1
3-1
February 28/94 Revised
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