2-0-101
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Mechanical Engineering
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Nov 24, 2024
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SERVICE BULLETIN
NOTICE:
The Type of Change and Recommended Compliance specified reflects Solar’s best judgment regarding the
Service Bulletin. All questions should be directed to your Solar Field Service Representative. Solar, Saturn,
Centaur, Taurus, Mercury, Mars, Titan, SoLoNOx, and Turbotronic are trademarks of Solar Turbines Incorporated.
Cat and Caterpillar are trademarks of Caterpillar Inc. Specifications subject to change without notice.
NUMBER:
2.0/101
ISSUED:
September 1981
REVISED:
PRODUCT:
Centaur
MODEL(S):
All
Specifics:
Units with hydraulic start system
SUBJECT: REINFORCED ELBOWS FOR HYDRAULIC START SYSTEM
Type of Change:
Product Reliability
Recommended
Compliance:
Earliest Convenience
Purpose:
To announce the availability of reinforced elbows for the Centaur hydraulic start system and provide
installation instructions.
GENERAL INFORMATION:
Hairline cracks have developed in the flanges of elbows in the hydraulic start system, usually after
removal/reinstallation of hydraulic motor and pump. This was attributed to slight misalignment af-
ter reinstallation. Solar is now offering reinforced elbows for replacement as shown in the following
"parts required" table.
PARTS REQUIRED:
Solar also recommends purchase of the applicable O-ring. These parts can be obtained by contact-
ing the nearest Solar District Office.
SERVICE BULLETIN
Page 1 of 6
NUMBER: 2.0/101
Old Part No.
New Part No.
O-Ring Part No.
Fig. 1, 2, and 3
Index No.
121676-100
121676-101
903509C1
1
121676-200
121676-201
903737C1
2
121676-300
121676-301
903509C1
3
ACTION REQUIRED:
If cracks or leakage occur in the hydraulic start system elbow flanges, replace the elbow with a new
part as identified above.
PROCEDURES:
Refer to Figure 1, Figure 2, and Figure 3 to determine the applicable system and proceed as follows:
1.
Shut down unit and open circuit breakers.
2.
Turn master select switch to "off" and tag with "Do Not Operate" tag.
3.
Disconnect existing piping supports and hardware. Retain for reinstallation.
4.
Remove bolts on all split flanges.
5.
Disconnect piping at the lowest point and drain oil.
6.
Remove pipes and fittings. Discard elbows (Items 1, 2, and 3). Cap remaining fittings
and pipes, store in a clean area for reinstallation.
7.
Assemble the entire line run with the replacement elbows and new O-rings. All fittings
to be finger tight.
NOTE
Do not reinstall supports at this step.
8.
At the hydraulic pump, tighten the first fitting to the required torque (400-325 lb/in).
9.
At the hydraulic motor end, tighten the first fitting to the required torque (400-325 lb/in).
10.
Tighten the second fitting at the pump end to 850-800 lb/in.
11.
Tighten the second fitting at the motor end to 850-800 lb/in.
12.
Alternately tighten all remaining fittings in this manner to 850-800 lb/in. until reaching
the last block in the center.
Page 2 of 6
SERVICE BULLETIN
NUMBER: 2.0/101
13.
Remove the finger tight bolts from one side of the center block and check the relative
motion of the pipe to the block. Eccentricity should be no more than 1/2 in. radially in
any direction.
14.
If eccentricity is less than 1/2 in., tighten the last block to 850-800 lb/in.
15.
Reinstall supports and hardware removed in step 3.
16.
Restore system to normal, start engine and check for leaks.
SERVICE BULLETIN
Page 3 of 6
NUMBER: 2.0/101
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Figure 1
Electrohydraulic Start System for Centaur Generator Sets.
Page 4 of 6
SERVICE BULLETIN
NUMBER: 2.0/101
Figure 2
Turbohydraulic Start System for Centaur Generator Sets.
SERVICE BULLETIN
Page 5 of 6
NUMBER: 2.0/101
Figure 3
Electrohydraulic Start System for Centaur Mechanical Drive Set.
Page 6 of 6
SERVICE BULLETIN
NUMBER: 2.0/101
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