4.52 FREQUENCY ADJUST R4 MAINTENANCE.
This task covers:
General Mechanics Tool Kit
(item 2, appendix B)
Generator Set 150 kW
Automotive Fuel and Electrical System Repair, Tool Kit
(item 3, appendix B)
(item 12, appendix E)
(item 10, appendix E)
Disconnect the negative battery cable first and then the positive bat-
tery terminal cables. Failure to observe this warning could result in se-
vere personal injury or death.
Tag all cables prior to removal to ensure correct connection of the
cables during installation.
Open flap (2, figure 4-49) on unit hood assembly (1).
Open front panel (4) on control cabinet assembly (3) and secure with prop (5).
Record labeling and position of cables (8) and unsolder cables (8) from terminals (10) of FRE-
QUENCY ADJUST R4 (9) potentiometer.
Unsolder resistor R4A (7) from terminals (10) of FREQUENCY ADJUST R4 (9) potentiometer,
Loosen socket head screw (16) on rotary knob (15) and remove rotary knob (15) and dial (14) and
stop plate (13).
Remove threaded element (12) and remove FREQUENCY ADJUST R4 potentiometer (9) and ser-
rated lock washer (11) from the rear of front panel (4).
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