SEAL-U-CUP 0931479 - Caterpillar

Table 1
TOOLS NEEDED    
Part Number     Tool     Quantity    
6V-7070     Multimeter     1    
243-3134 (1)     Tester Group     1    
( 1 ) Or equivalent.
Illustration 1 g00613957
(1) Positive Rectifier Block (2) Negative Rectifier Block (3) Rectifier Terminal "AC1" (4) Rectifier Terminal "AC2" (5) Rectifier Terminal "AC3"Note: Verify part number 9Y-0916 rectifier block date code as 0503 or greater. Refer to illustration 2. Rectifiers with a date code of 0503 and greater contain an internal varistor (CR7). Follow testing procedures with internal varistor (CR7).
Illustration 2 g01229622
(6) Date code
Personal injury or death can result from improper troubleshooting and repair procedures.The following troubleshooting and repair procedures should only be performed by qualified personnel familiar with this equipment.
Personal injury or death can result from high voltage.When power generation equipment must be in operation to make tests and/or adjustments, high voltage and current are present.Improper test equipment can fail and present a high voltage shock hazard to its user.Make sure the testing equipment is designed for and correctly operated for high voltage and current tests being made.When servicing or repairing electric power generation equipment:
Make sure the unit is off-line (disconnected from utility and/or other generators power service), and either locked out or tagged DO NOT OPERATE.
Make sure the generator engine is stopped.
Make sure all batteries are disconnected.
Make sure all capacitors are discharged.
Shut off engine and remove key before performing maintenance or repair work. Failure to do so may result in personal injury due to inadvertant machine operation.Do not start the engine or move any of the controls if there is a "Do Not Operate" or similar warning tag attached to the start switch or controls.
Do not connect generator to a utility electrical distribution system unless it is isolated from the system. Electrical feedback into the distribution system can occur and could cause personal injury or death.Open and secure main distribution system switch, or if the connection is permanent, install a double throw transfer switch to prevent electrical feedback. Some generators are specifically approved by a utility to run in parallel with the distribution system and isolation may not be required. Always check with your utility as to the applicable circumstances.
Procedure - Rectifier
The following procedure tests all six diodes within the block. If any meter reading does not fall within the given ranges, replace the rectifier block .
Set the digital multimeter on the diode range. Remove all leads from the rectifier block.
Place the black test lead on the positive "+" rectifier terminal. Place the red test lead on the