KIT (seal) 3G5859 - Caterpillar

Introduction
This chapter describes receiving, storage, and installation requirements for the PSG governor.Use care while handling and installing the PSG governor. Be particularly careful to avoid striking the drive shaft, terminal shaft, or a speed setting device. Abuse can damage seals, internal parts, and factory adjustments. Do not set the governor on its drive shaft.Receiving
After factory testing and calibration, the PSG governor is drained of oil, which leaves a light film of oil on internal parts to prevent rust. The governor is then painted and external parts are coated with a spray lubricant/rust inhibitor.No internal cleaning or flushing is necessary before installation and operation. The little oil left in the governor is clean, multiviscosity engine oil which will not contaminate an engine oil system.Storage
The PSG governor may be stored for short periods of time (less than a year) as received from the factory. For long-term storage (more than a year), storage in an environment with large temperature changes, humid or corrosive atmosphere, or if the governor is installed on the engine for storage, fill the governor with oil and follow preservation packaging instructions in Woodward Manual 25075, Commercial Preservation Packaging for Storage of Mechanical-Hydraulic Controls.External Return Spring
The PSG uses internal oil pressure to move the output in the more-fuel direction only. A spring is used to move the output in the fuel-off direction. If an internal return spring is not supplied, an external spring must be installed. The return spring must provide a torque of 2.8 to 5.6 N m (25 to 50 lb-in) on the terminal shaft in the fuel off direction for a governor with 175 or 275 psi operating pressure respectively.Oil Supply
Almost all PSG governors use engine oil in the governor. Some governors use oil from a separate sump.Supply Pressure
A minimum of 172 kPa (25 psi) and a maximum of 517 kPa (75 psi) oil must be supplied from the engine lubricating system. If a separate sump is used the supply must have less than 300 mm (12 inches) of suction lift from the sump. Torque and work capacity will vary according to the amount of supply pressure or suction lift. Consult Woodward Governor Company if supply pressures must exceed 517 kPa (75 psi).
Figure 2-1. Separate Sump Installation
Table 2-1. Oil ChartPeak demand from the governor will be 7.6 liters/minute (2 gallons/minute) during transients. The Governor will flow 1.3 liters/minute (0.35 gallons/minute) during steady state.Governor oil is both a lubricating oil and a hydraulic oil. It must have a viscosity index that allows it to perform over the operating temperature range and it must have the proper blending of additives that cause it to remain stable and predictable over this range.Use the information given in Table 2-1 as a guide in the selection of a suitable lubricating-hydraulic oil. For applications where the governor shares the oil supply with the engine, use the oil recommended by the engine manufacturer for engine lubricating oil. Should this oil not be included in the table, contact Woodward Governor Company.Drive Shaft Rotation
Rotation