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PGEV and PGE Locomotive Governors. Manual - part 13

Manual 36703

PGEV and PGE Locomotive Governors

Woodward

Trouble Cause

Correction

Jiggle at governor rod
end or at terminal
shaft.

Rough engine drive.

Inspect drive mechanism:
a.

Check alignment of gears.

Inspect for rough gear teeth,
eccentric gears, or excessive
backlash in gear train.

Check gear keys and nuts or set
screws holding drive gears to
shafts.

Tighten chain between crankshaft
and camshaft (if used).

Check engine vibration dampener
(if used).

If governor has serrated drive
shaft, check for wear of shaft and
serrated coupling.

Failure of flexible drive in fly-weight
head.

Remove, disassemble, and clean fly-
weight head parts.

Check spring and install new spring
coupling assembly if necessary. Center
the coupling for equal travel in opposite
directions.

Governor not bolted down evenly on
engine mounting pad.

Loosen screws, disconnect the fuel
linkage, and turn the governor 45 cw
and ccw on its mounting pad a few
times. Tighten screws.

Engine is slow to
recover from a speed
deviation resulting
from a change in load
or slow to respond to
a change in speed
setting.

Incorrect buffer springs in governor.

Install correct buffer springs (consult
Woodward Governor Company).

Governor oil pressure is low.

See item 2 of this table.

Fuel supply restricted.

Clean fuel filters and fuel supply lines.

Engine may be overloaded.

Reduce the load.

Supercharger does not come to new
speed quickly to supply sufficient air to
burn the added fuel.

No simple field correction. Consult
engine manufacturer and Woodward
Governor Company or overhaul
supercharger.

Engine does not pick
up rated full load.

Fuel racks do not open far enough.

Check fuel-pump stops and adjust
as necessary.

Check linkage between governor
and fuel pumps and adjust if
necessary.

Oil pressure maybe too low. See
item 2 of this table.

Supercharger does not supply sufficient
air.

Overhaul supercharger.

6. Engine

overspeeds

on starting.

Governor too slow.

Adjust needle valve for highest opening.
Install lighter buffer springs, if possible.

Speed setting too high.

Decrease starting-speed setting.

Governor admits too much fuel for
starting.

Limit travel of booster servomotor.

Readjust speed setting or manifold
pressure torque limiter (consult
engine manufacturer).

Compensation bypass retarded.

Install short buffer piston.

7. Engine

stalls

deceleration to
minimum speed.

Governor too slow.

Adjust needle valve for maximum
opening. Install lighter buffer spring. Try
shorter buffer spring.

Minimum speed too low.

Raise minimum speed.

Compensation not being cut off at idle.

Consult Woodward Governor Company
to check how governor is built.

PGEV and PGE Locomotive Governors

Manual 36703

Woodward

Trouble Cause

Correction

Hard starting and/or
excessive smoke for a
short duration during
starting after a
relatively long
shutdown period.

The fuel limiter's anti-siphoning check
valve leaking--sensor piston goes to
maximum-fuel position at start-up and
then returns to minimum-fuel position as
housing refills with oil.

Replace check valve.

9. Excessive

smoke

during acceleration.

Fuel-limiter orifice pack clogged--sensor
piston goes to and remains at maximum
fuel position.

Drain governor oil, flush with fuel oil or
kerosene. Refill with clean oil. Operate
for a short time. Then drain and refill. If
necessary, remove fuel limiter orifice
pack, disassemble, and clean.

Fuel limiter not adjusted correctly.

Adjust as instructed is Chapter 6.

Restoring spring fatigued or broken.

Replace restoring spring.

10. Engine bogs during

acceleration.

Load control override linkage improperly
adjusted.

Adjust as instructed in Chapter 6.

11. Erratic

operation.

Contaminated or foamy oil. Sludge
formation.

Drain governor oil; flush with fuel oil or
kerosene. Refill with clean oil; operate
for a short time, drain, and refill. If
necessary, remove fuel limiter,
disassemble, and clean.

Low governor oil level--air entrapment.

Add oil to correct level as indicated on
sight gauge glass. Check for leakage,
particularly at the governor drive shaft
oil seal. Check manifold air pressure
line for presence of oil which would
indicate leakage at the fuel-limiter
bellows.

Leakage in manifold air pressure lines
or fittings.

Repair leaks.

Fuel-limiter bellows leaking.

Replace bellows.

12. Deadband at low or

high end of fuel-
limiting schedule.

Fuel-limiter-sensor piston travel not
properly calibrated within manifold air-
pressure range.

Adjust as instructed in Chapter 6.

Fuel limiter troubles such as erratic operation or slow response to changes in
manifold air pressure are usually the result of oil contamination. Correct this type
of trouble by flushing the governor with fuel oil or kerosene.

To prevent damage to oil seals or gaskets, DO NOT use non-
petroleum-base solvents.

Manual 36703

PGEV and PGE Locomotive Governors

Woodward

Chapter 5.

Maintenance

Introduction

This chapter describes maintenance which includes instructions for disassembly,
cleaning, inspection, repair, and assembly.

Special Tools

Refer to manual 36405 for a listing of special tools required for maintenance or
overhaul.

General Instructions

Use care in handling the governor to avoid damage to the drive shaft,
oil seal, bearing and other internal parts or surfaces. Place the
governor on supporting blocks and do not strike the drive shaft.

1.  Drain oil, if any, from governor.

2.  Clean exterior surfaces using a cloth moistened with cleaning solvent.

3.  Do not remove or disturb the position of screws, brackets, etc., which

function as adjustments; nor disassemble the various linkages further than
required to effect removal unless replacement of component parts is
necessary.

4. Do not remove press-fit parts such as bearings, locating (dowel) pins, oil

pump check valves, pivot pins, etc., unless replacement is necessary or
removal is required to effect disassembly or removal of other parts.

5. Discard, do not reuse gaskets, preformed packings (O-rings), oil seals,

copper sealing washers, retaining rings, cotter pins, roll or spirol pins, etc.,
removed in the process of disassembly.

Disassembly

Place the governor on some type of stand to protect the drive shaft and hold the
governor in position to be worked on.

1.  Remove cover (2 screws).

2.  If overriding solenoid (ORS) bracket is present, remove it. (Figure 5-1).

3.  Remove solenoid pack (Figure 5-2).

a. Disconnect wires from terminal block.

b. Remove three screws that secure the solenoid pack to the column.

c. Lift off solenoid pack.

PGEV and PGE Locomotive Governors

Manual 36703

Woodward

Figure 5-1. PGEV with Fuel Limiter

Figure 5-2. Solenoid Pack

4. Remove fuel limiter (Figure 5-3).

a. Remove shutdown nut, limiter nuts, and bushing.

b. Remove loading spring.

Remove

screws.

d. Disconnect load-control floating lever from tailrod.

e. Disconnect load-control floating lever from load-control link.

Disconnect air connection coupling.

g. Lift off the fuel-limiter assembly (Figure 5-4).

h. Lift out the overriding solenoid spring (ORS) and piston (Figure 5-5).

Lift out the load-control bushing, spring, and gasket (Figure 5-6).

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