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PGEV and PGE Locomotive Governors. Manual - part 5

Manual 36703

PGEV and PGE Locomotive Governors

Woodward

Figure 1-7b. Outline Drawing of PGEV Governor with Integral Vane Servo, Water

Box, and Linear Output

(Do not Use for Construction)

Figure 1-8. Typical Wiring Diagram

PGEV and PGE Locomotive Governors

Manual 36703

Woodward

Figure 1-9. Typical Wiring Diagram for 12 Pole Connector

Figure 1-10. Typical Wiring Diagram for 16 Pole Connector

Manual 36703

PGEV and PGE Locomotive Governors

Woodward

Chapter 2.

Installation and Adjustment

Introduction

Refer to Figure 1-5, 1-6, or 1-7 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 (26.2 mm) 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.

PGEV and PGE Locomotive Governors

Manual 36703

Woodward

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 engine, turbine, or other type of prime mover should be
equipped with an overspeed shutdown device to protect against
runaway or damage to the prime mover with possible personal injury,
loss of life, or property damage.

The overspeed shutdown device must be totally independent of the
prime mover control system. An overtemperature or overpressure
shutdown device may also be needed for safety, as appropriate.

Adjustments

Normally, the only requirements for putting a new or overhauled governor into
service are bleeding entrapped air and adjusting the compensation needle valve
to obtain maximum stability. All other operating adjustments are made during
testing at the factory in accordance with the engine manufacturer's specifications
and should not ordinarily require further adjustment. If found necessary to
change or readjust speed settings or other operating adjustments, refer to the
engine manufacturer's instructions. Do not attempt internal adjustment of the
governor unless thoroughly familiar with the proper procedures.

Compensation Needle Valve Adjustment

The compensation needle valve is an adjustable part of the compensation
system. Its setting, which directly affects governor stability, depends upon the
individual characteristics of the prime mover:

1. With the prime mover operating at IDLE, open the compensation needle

valve several turns to cause the engine to hunt. In some cases, opening of
the needle valve alone may not cause the engine to hunt, but manually
disturbing the governor speed setting will induce the governor to move
through its full output stroke. Allow several minutes of hunting to remove
trapped air in the hydraulic circuits.

2. Close the compensation needle valve gradually until hunting is just

eliminated. Keep the needle valve open as far as possible to prevent
sluggishness in the governor response. The needle valve setting varies from
1/16 to 2 turns open. Never close it tight, the governor cannot operate
satisfactorily when this condition exists.

3. Check the governor stability by manually disturbing the governor speed setting.

The compensation adjustment is satisfactory when the governor returns to
speed with only a slight over - or undershoot. Once the needle valve
adjustment is correct, it is not necessary to change the setting except for large,
permanent changes in temperature which affect governor oil viscosity.

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