ALTERNATOR GP-CHARGING 1077977 - Caterpillar

Correct maintenance and overhaul procedures are important for acceptable service life of the front power take-off (FPTO) for 3408 and 3412 Marine Engines. Owners, operators, and dealers must use the correct maintenance procedures that follow, with special importance put on regular maintenance intervals.
Dealer Maintenance
A) Adjustment of Force Needed to Engage FPTO: The force needed to engage the new FPTO units must be checked with a spring scale before the FPTO units are put into service. After the first 10 hours of operation, the force must be checked again and the clutch adjusted if necessary. During the first 10 hours or "wear-in" interval, it is possible several adjustments will have to be made until the plates are "worn-in". After "wear-in" check the adjustment whenever the boat is available.
A wrong adjustment of the force can cause slippage, which can cause excessive (too much) plate wear, plate cracking and FPTO failure.
Use the procedure that follows to adjust the front power take-off clutches: 1. Disconnect any linkage from the clutch lever (if so equipped).2. Measure distance (x) as shown in Chart A. Distance (x) is the dimension from the center of the shaft to a location on the clutch lever where the spring scale will be fastened to measure the amount of force needed to engage the clutch. Fasten a spring scale at the correct location on the clutch lever. See chart A.
A torque wrench with a 8S2243 Retainer Nut or 5P1668 Nut can also be used to measure the force needed to engage the clutch. Install the torque wrench and nut to the engagement shaft on the end opposite to the lever. The minimum and maximum torques needed to engage the clutch are given in the Chart B.
3. Keep the angle between the clutch lever and the spring scale at 90°. Pull the spring scale in the direction shown in the illustration until the clutch engages. Make a record of the amount of force needed to engage the clutch. Check the chart for the correct amount of force needed to engage the specific clutch.4. If the amount of force needed to engage the clutch is not correct, remove the inspection cover. See Illustration 1. Turn the clutch until the lock pin can be seen through the inspection opening. Release the push-type lock pin and turn the adjustment ring clockwise as seen from the rear of the clutch to increase the force needed or counterclockwise to decrease the force needed to engage the clutch.5. Check the amount of force needed to engage the clutch again. Adjust the adjustment ring until the force is correct. After each adjustment check the lock pin to make sure it is in a notch.
Illustration 1. Location of parts in FPTO.6. The initial adjustment must be checked frequently to prevent slippage during the break-in until the clutch disc has a good seat.7. The new adjustment specifications take the place of the former specifications that are on the clutch identification plates and those given in the Service Manual.