SEAL-O-RING 2332601 - Caterpillar

Introduction
This chapter covers various steps for maintenance of the PSG governor. The portion on troubleshooting provides information if trouble occurs. General troubleshooting advice and instructions for setting the needle valve and droop are provided in advance of the troubleshooting chart.If the minor adjustments do not help, removal of the governor from the engine for either a complete overhaul or return to an authorized repair facility for repair and testing may be required. Adequate instructions are provided for disassembly, reassembly, and testing of your governor. However, the test specifications for the particular governor must be requested from Woodward.General Troubleshooting
Governor faults are usually revealed in engine speed variation, but it does not necessarily follow that such speed variations indicate governor faults. Poor governing may be due to faulty operation of the engine or of auxiliary equipment.Dirty Engine Oil
The PSG governor is normally supplied with engine oil. A failed or dirty filter in the supply line or unusual oil contamination can cause governor problems. If the governor has been contaminated with dirty engine oil, it may be removed from the engine and flushed with a petroleum solvent. The use of non-petroleum-base solvents is not recommended as it may damage oil seals or gaskets. Fuel oil or kerosene are the best solvents for cleaning the inside of a PSG governor.
Always drain the governor of solvents before returning it to the engine to avoid the possible contamination of the engine oil supply.
Oil contamination, oil viscosity, and oil supply are major causes of PSG governor problems. ANY CHANGE IN THE VISCOSITY OF THE OIL SUPPLIED TO THE PSG GOVERNOR WILL REQUIRE A CHANGE IN THE NEEDLE VALVE SETTING OF THE GOVERNOR.Linkage
The second most common cause of governor related problems is caused by the linkage from the governor to the engine. Always carefully inspect this linkage for wear or other changes when governor problems are suspected. If an external return spring is used, investigate this installation for changes or poor installation.Governor Drive
Excessive backlash or a tight meshing of the gears driving the governor may cause speed variations or erratic control by the governor.Check List
Before determining that a governor is the cause of speed variations or aberrations, conduct the following checks of engine/governor operation:1. Check the load to be sure that the speed changes observed are not the result of load changes beyond the capacity of the engine.2. Check engine operation to be sure that all cylinders are firing properly and that the injectors are in good operating condition.3. Check the linkage between the governor and the engine to make certain there is no binding or lost motion.4. Check for fuel pressure changes.5. Check the speed-setting mechanism for proper operation. Pneumatic-supply problems can effect the pneumatic head. Erratic motor operation or slippage in the clutch between the motor and the governor can affect motor speed setting.6. Check the engine drive to the governor.7. Check the oil supply to the governor.Glossary of Terms
HUNTA rhythmic variation of speed which can be eliminated by blocking governor output manually but