BOLT 8U5746 - Caterpillar

Introduction
Refer to Figure 1-5 or 1-6 for complete physical dimensions of the governor. Use care in handling the governor; be careful to avoid striking the drive shaft. Do not drop or rest the governor on its drive shaft. Such treatment could damage the governor.Installation
Take care to ensure that the governor is mounted squarely and that the drive connection to the engine drive is properly aligned. Do not use force when making this connection. A gasket must be used between the governor base and mounting pad. Misalignment of the governor with respect to its mounting pad, or engine drive connection, or too tight a fit between governor drive and drive coupling can result in excessive wear or seizure and may also cause undesirable "jiggle" at the output shaft.The linkage from the governor to the engine fuel system must be properly aligned to eliminate binding and/or excessive backlash. The relationship of "piston gap" (see Figure 3-1) or terminal shaft angular position to rack position must be adjusted in accordance with the engine manufacturer's specifications. Due to the location of the compensation cutoff port in the power cylinder wall, the governor/fuel rack linkage must be adjusted so the power piston "gap" does not exceed 1-1/32 inches at no load idle.Make the hydraulic and electrical connections required for the particular model governor being installed. Fill governor with oil to a level between lines on oil gauge sight glass. Fill the governor with oil to the line on the oil gauge (on models with only one line on the gauge). Oil must be clean and of a grade suitable for the particular operating conditions (see Specifications). Recheck oil level after engine is started and add oil as necessary. Do not overfill. Maintain the correct oil level at all times.
On governors equipped with an integral vane servo and resistor pack, the cavity around the resistor pack (rheostat) must be completely filled with oil before putting a load on the unit. Without oil for cooling, sufficient heat can be generated to overheat the resistor wiring and insulation. This Caution does not apply to governors with integral vane servos and ceramic resistors.
To fill the cavity when the governor is on a test stand, energize or de-energize the overriding solenoid. This lowers or raises the overriding valve plunger, raising or lowering the load control pilot valve plunger and releasing oil to the rheostat cavity. When filling the rheostat cavities on the engine, move the throttle from the IDLE position to number two position. The load control pilot valve plunger changes position, allowing oil to enter the rheostat cavity. Changing load with the throttle should be done a few times to be sure the cavity is full. The cavity is full when the oil completely fills the area behind the indicator glass.Check governor oil level and add oil if necessary.
The prime mover should be equipped with a separate overspeed (overtemperature, or overpressure, where applicable) shutdown device(s), to protect against runaway or damage to the prime mover with possible