DTI Winco 12PTOC-3 User manual

60706-133
12PTOC-3
25PTOC-3
Tractor Drive
PTO Generators
OWNERSMANUAL
INSTALLATION AND OPERATION INSTRUCTIONS
SAFETY FIRST
READ THIS MANUAL BEFORE OPERATING YOUR GENERATOR.

Read and understand all instructions in this
manual before starting and operating the
generator set.
USING THIS MANUAL
Congratulations on your choice of a Winco generator set.
You have selected a high-quality, precision-engineered
generator set designed and tested to give you years of
satisfactory standby service.
To get the best performance from your new generator
set, it is important that you carefully read and follow the
operating instructions in this manual.
COPYYOURMODELANDSERIALNUMBERHERE Noother
WINCO generator has the same serial number as yours. It
is important that you record the number and other vital
information here, if you should ever need to contact us on
this unit it will help us to respond to your needs faster.
MODEL____________________________________
SERIAL NUMBER____________________________
PURCHASE DATE____________________________
DEALER___________________________________
TABLE OF CONTENTS
INTRODUCTION i
36MONTHWARRANTY i
GUIDETOPRODUCTSAFETY 1
BASICINFORMATION 2
PREPARINGTHEUNIT 2
Unpacking the unit 2
Assembly 2
INSTALLATION 3
Foundation Mounting 3
Trailer Mounting 3
ELECTRICALCONNECTIONS 4
OPERATION 5
Pre-Start Checks 5
Starting Procedure 6
Stopping 6
MAINTENANCE 7
Lubrication 7
Cleaning and Inspection 7
Storage 8
Generator Testing 8
TroubleShootingTable 10
WINCO PTO GENERATORS
36 MONTH LIMITED WARRANTY
WINCO, Inc., warrants for thirty-six months from date of shipment, that it will repair or replace at its option, for the original
user, the whole or any part of the product found upon examination, by WINCO at its factory at 225 South Cordova Avenue,
Le Center, Minnesota, or by any factory-authorized service station, to be defective in material or workmanship under normal
standby use (average less than 50 hours per month) and service.
For warranty service, return the product within 36 months from the date of purchase, transportation charges prepaid, to
your nearest factory-authorized service station or the WINCO factory.
Thereisnootherexpresswarranty. Totheextentpermittedby law,anyandallwarranties,includingthoseofmerchantability
and fitness for a particular purpose, are limited to 36 months from date of shipment, and liability for incidental or
consequential damages or expenses is excluded. Some states do not allow limitations on the duration of an implied
warranty, and some states do not allow the exclusion or limitation of incidental or consequential damages, so that above
limitation or exclusion may not apply to you. This warranty gives you specific legal rights; you may have other rights which
vary from state to state.
This warranty is limited to bench labor and parts only, no allowance will be made for travel time, or removal and reinstallation
of the PTO unit.
WINCO does not warrant drive lines, trailer tires, receptacles, or certain other component parts of the product installed by
others, since such items are warranted by their manufacturers.
WINCO does not warrant modifications or alterations which were not made or authorized by the WINCO factory and which
affect the stability or reliability of the product.
WINCO does not warrant products which have been exposed to misuse and/or negligence or have been involved in an
accident.
WINCO does not warrant products which have been installed in such a manner as not to protect them from the adverse
environmental conditions (water, mud, insects, etc.) or have not been kept clean.
WINCO reserves the right to change or improve its products without incurring any obligations to make such changes or
improvements on products purchased previously.

Page160706-133 8290-01
SAFETY INFORMATION
This generator set has been designed and manufactured to
allow safe, reliable performance. Poor maintenance,
improper or careless use can result in potential deadly
hazards; from electrical shock, exhaust gas asphyxiation, or
fire. Please read all safety instructions carefully before
installation or use. Keep these instructions handy for future
reference. Take special note and follow all warnings on the
unit labels and in the manuals.
ANSI SAFETY DEFINITIONS
______________________________________________________
DANGER:
DANGER indicates an imminently hazardous situation which,
if not avoided, will result in death or serious injury. This signal
word is to be limited to the most extreme situations.
______________________________________________________
______________________________________________________
WARNING:
WARNING indicates a potentially hazardous situation which, if
not avoided, could result in death or serious injury.
______________________________________________________
______________________________________________________
CAUTION:
CAUTION indicates a potentially hazardous situation
which, if not avoided, may result in minor or moderate injury. It
may also be used to alert against unsafe practices.
______________________________________________________
NOTE:
CAUTION is also used on the unit labels and in this
manual to indicate a situation that could result in serious
damage or destruction of the equipment and possible
personal injury.
______________________________________________________
1. ELECTRIC SHOCK- The output voltage present in this
equipment can cause a fatal electric shock. This
equipment must be operated by a responsible person.
a. Do not allow anyone to operate the generator
without proper instruction.
b. Guard against electric shock.
c. Avoid contact with live terminals or receptacles.
d. Use extreme care if operating this unit in rain or
snow.
e. Use only three-prong grounded plugs and
extension cords.
f. Be sure the unit is properly grounded to an
external ground rod driven into the earth.
g. Do not make or break electrical connection under
load.
2. FIRE HAZARD- Gasoline, diesel and other fuels always
present a hazard of possible explosion and/or fire.
a. Keep a fire extinguisher nearby and know its
proper use. Fire extinguishers rated ABC by
NFPA are appropriate.
3. DEADLY EXHAUST GAS -Exhaustfumes from any engine
contain carbon monoxide, an invisible, odorless and
deadly gas that must be mixed with fresh air.
a. Operate only in well ventilated areas.
b. Never operate indoors.
4. NOISE HAZARD - Excessive noise is not only tiring, but
continual exposure can lead to loss of hearing.
a. Use hearing protection equipment when
working around this equipment for long periods of
time.
b. Keep your neighbors in mind when permanently
installing this equipment.
5. CLEANLINESS- Keep the generator and surrounding area
clean.
a. Remove all grease, ice, snow or materials that
create slippery conditions around the unit.
b. Remove any rags or other material that could
create potential fire hazards.
6. SERVICINGEQUIPMENT-Allservice,includingthe
installation or replacement of service parts, should be
performed only by a qualified technician.
a. Use only factory approved repair parts.
b. Do not work on this equipment when fatigued.
c. Use extreme caution when working on electrical
components. High output voltages from this
equipment can cause serious injury or death.
d. Always avoid hot mufflers, exhaust manifolds, and
engine parts. They all can cause severe burns
instantly.
7. INSTALLATION- Installing a PTO generator is not a “do-it-
yourself” project. Consult a qualified, licensed electrician
or contractor. The installation must comply with all
national, state, and local codes.
a. Never operate the PTO drive generator without having
it properly mounted to a concrete base or approved
trailer.
b. Never connect the PTO generator to an existing
electrical system without installing an isolation
transfer switch.
c. Always insure the drive shaft is straight and level
before operating the generator.
8. OPERATION - PTO drive shafts (Tumbling Bars) have
many inherent dangers, extreme caution must be
exercised when using them.
a. NEVER allow children around a drive shaft when it is
in operation.
b. Keep all safety guards and shields in place and
securely tightened.
c. Never operate a drive shaft that has been damaged
or had the safety shield removed.
d. Never step over a drive shaft while it is running.
e. Never wear a necktie, loose articles of clothing, or
anything else that can be caught in moving parts.
f. Never try to stop a turndrive shaft with your hand or
yourfoot.

Page2 60706-133 8290-01
Description
The WINCO rotating armature power take-off generators are
designed primarily for farm use as a standby electrical power
supply, utilizing the power take-off of a tractor or truck as the
prime mover. This PTO drive generator will provide, 120/240V
single phase, 60Hz electrical service when properly driven.
NOTE: The prime mover which drives the generator must be
capable of delivering approximately 2 HP per 1000 watts
output from the generator. Observe input RPM specifications.
The generator may be foundation mounted for use as standby
power source, or trailer mounted, and used as portable
electrical power sources for areas where commercial power
is not readily available, such as out buildings.
This generator includes a color coded voltmeter to warn
against high or low voltage, three output power receptacles,
an overload protection circuit, and an electronic excitation
circuit. To reduce maintenance problems, the coupling
between the generator input shaft and rotor consists of
precision helical gearing rather than a chain link drive. The
input shaft is a 1 1/8 in. diameter smooth shaft with a keyway
and center drilled for a roll pin. Both must be used at all
times.
The factory thoroughly tests each generator before shipment.
All are continuous duty rated.
IMPORTANT: THE MANUFACTURER STRONGLY RECOM-
MENDS RUNNING THE GENERATOR UNDER LOAD AT
LEAST ONCE A MONTH IN ORDER TO EVAPORATE ANY
ACCUMULATED MOISTURE CONDENSATION.
UNPACKING
CAUTION: Equipment Damage
DO NOT invert generator during unpacking. The Gearcase
contains oil which will leak out if inverted during unpacking.
Unpack the generator as follows:
1. Remove the carton.
2. Examine the unit for damage.
3. Find the small subpack carton packed in the large carton.
Be careful not to throw away the subpack carton with the
large carton.
4. Open the subpack carton and make sure it contains:
a. Generator instruction manual
b. Load disconnect plug (disassembled, in bag)
5. Remove the four bolts which hold down the generator feet
to the pallet.
6. Lift the generator from the pallet by means of the lifting
eye on the top of the generator.
7. Inspect the generator carefully for freight loss or damage.
If loss or damage is noted at time of delivery, require that
the person making the delivery make note of the loss or
damage on the freight bill, or sign the consigner’s memo
of the loss or damage. Contact the carrier for claim
procedures.
When loss or damage is noted after delivery, segregate the
damaged material, and contact the carrier for claim proce-
dures.
“Concealed damage” means damage to the contents of a
package which is not evident when the package is delivered
by the carrier, but which is discovered later. The carrier or
carriers are responsible for merchandise lost or damaged in
transit. The title to the goods rests with the consignee when
the goods are shipped FOB factory, and only the consignee
can legally file claims. Two years are allowed in which to file
suit after a claim is disallowed in writing by the carrier.
Assembly
25PTOC-3
The only assembly work required after unpacking the genera-
tor is to assemble and wire the load disconnect plug, which is
contained in a bag in the subpack carton packed in the
generator crate. The bag contains an instruction sheet, a plug
body, three or four brass pins (large pin for neutral line), and a
small envelope. The small envelope contains an allen
wrench, retainer pins, and set screws.
To wire the load disconnect plug, use the following type of
cable:
Generator Size,
Model AWG Insulation
25PTOC-3 4 600V, Neoprene
To assemble and wire the load disconnect plug,
proceed as follows (see Figure 1):
1. Cut cables to the required length.
2. Strip off insulation 7/8" back from one end of each of the
cut-to-length cables.
3. Start threading a set screw into each pin.
4. Insert the stripped end of one cable fully into one of the
brass pins, and tighten the set screw firmly to secure the
cable end in the pin.
DANGER:EquipmentDamage
If cable-to-pin connections are loose, arcing and heat damage
to equipment can result.
OctopusPlugAssemblyFigure 1

Page360706-133 8290-01
C. The foundation surface should be flat.
D. Space is required around the generator for mounting
switching devices, making connections, and for servicing.
E. The generator mounting backet must rest evenly and firmly
on the foundation. Install shims if necessary to even out
the foundation under the mounting pads then bolt the gen-
erator firmly in place.
TRAILERMOUNTING
Mount the generator on a trailer if you plan to use it as a
portable power source. See Figure 4. When selecting or
building a trailer to mount the generator, consider the follow-
ing points:
A. The trailer construction must be strong enough to support
the generator.
B. The design of the trailer must enable the trailer to remain
stable during operation, and to resist tipping caused by
generator starting and reflected load torque.
WARNING: Personal Injury & Equipment Damage
TRAILER MAY TIP OVER AND CAUSE INJURIES IF
WHEELS ARE NOT SPACED FAR ENOUGH APART.
C. The trailer height and mounting position of the generator
on the trailer should enable aligning the drive shaft (tum-
bling bar) in a straight or nearly straight line between the
power take-off and generator input shafts. Misalignment
must be less than 15 degrees during generator operation,
even though the mechanical design of the tumbling bar
would allow greater misalignment.
D. The generator mounting area of the trailer bed should be
flat.
E. The generator mounting bracket must rest evenly and
firmly on the trailer bed. Install shims if necessary to even
out the bed under the mounting pads, then bolt the genera-
tor firmly in place.
5. Insert the brass pin (with cable) into the plug body, and
line up the retainer pin holes in the brass pin with those
in the plug body.
6. Insert the retainer pin, and tap it firmly into place. The
retainer pin will protrude approximately 3/8" when fully
seated. (See Figure 1.)
7. Repeat steps 4 through 6 for each brass pin. Make sure
to connect the neutral lead (cable), identified and color
coded in conformance with the applicable local electrical
codes, to the large diameter pin (“N”) on the plug.
WARNING:ElectricalShock
DURING THE NEXT STEP, THE LOAD DISCONNECT PLUG
SHOULD NOT BE PLUGGED INTO ITS RECEPTACLE.
ALSO, MAKE SURE THAT THE EQUIPMENT TO WHICH
THE PLUG LEADS (CABLES) ARE BEING CONNECTED IS
NOT ENERGIZED (LIVE).
8. Strip the insulation off the free end of each of the plug
leads (cables), and connect them to the load transfer switch
(or directly to the load).
12PTOC-3
The only assembly work required after unpacking the
generator is to assemble and wire the load disconnect plug,
which is contained in the subpack carton packed in the
generator crate. This load disconnect plug is a Alpha type 4
wire locking plug. The instruction for wiring the plug are in
the box with the plug. The gauge wire required will depend
on the type of wire you buy. You will need wire of sufficient
size to carry 50 amps at 240 volt. Consult with your local
wire supplier for the proper gauge and type.
Installation
FOUNDATIONMOUNTING
Mount the generator on a foundation if it is to be used as a
permanent or standby power source (see Figure 2). See
“TRAILER MOUNTING” if generator will be used as a
portable power source (see Figure 3). When planning a
foundation consider the following points:
A. The foundation location should enable aligning the drive
shaft (tumbling bar) in a straight or nearly straight line be-
tween the power take-off and the generator input shaft.
Misalignment must be less than 15 degrees during gen-
erator operation, even though the mechanical design of
the tumbling bar would allow greater misalignment.
B. The foundation must be solid enough to absorb genera-
tor starting and reflected load torque during operation.
Figure 2 Figure 3
Trailer, for Portable Operation

Page4 60706-133 8290-01
ELECTRICAL CONNECTIONS
CAUTION:
Only qualified electricians should install electrical wiring.
Wiring must conform to all applicable national, state, and local
codes. (Reference: National Fire Protection Association
Manual No. 70, National Electrical Code.)
DANGER:PERSONALINJURY
IF THE GENERATOR IS TO BE USED AS A STANDBY
POWER SOURCE, A SPECIAL DISCONNECT SWITCH
MUST BE INSTALLED TO SEPARATE THE GENERATOR
AND THE COMMERCIAL POWER LINES. THE
DISCONNECT MUST ISOLATE THE GENERATOR FROM
THE COMMERCIAL POWER LINES AND THE LOAD WHEN
THE GENERATOR IS ON STANDBY, AND MUST ISOLATE
THE COMMERCIAL POWER LINES FROM THE LOAD AND
THE GENERATOR WHEN THE GENERATOR IS SUPPLYING
POWER. SEE FIGURE 5.
Typical Connection Methods for Generator Power Service
Figure 5

Page560706-133 8290-01
Operation
OUTPUTPOWERAVAILABLEANDLOADDETERMINATION
Before using the generator, read and understand the following
information.
Generator output current (amperage) is internally limited by
circuit breakers. If too much demand is placed on a generator
output (if you try to drive too many motors with it, for example),
one of the circuit breakers will trip, cutting off the output in
order to protect the generator.
A 15 amp push-to-reset circuit breaker protects the 120V
duplex receptacle output circuit. 15 amps is the total limit for
both outputs of the duplex receptacle.
A 50 amp two pole switch type circuit breaker protects the
240V receptacle output circuit.
A large two pole switch type main circuit breaker protects the
generator windings and output circuits, including the load
disconnect receptacle outputs. The load disconnect recep-
tacle on the 25PTOC is the large round black rubber recep-
tacle on the generator output panel. The mating plug is a
WINCO part number 91357-000. On the 12PTOC it is the 50
amp 4 wire twistlock receptacle on the output panel. The
mating plug is a Hubbell CS6365.
To aid in determining how much load can be applied to the
generator, and how it should be distributed among the
generator output receptacles, the following formulas may be
useful. Get load voltage, current, and wattage from the
nameplates on the equipment in the load.
(Load Current, in amps) x (Load Voltage) = (Load Wattage)
AMPSXVOLTS=WATTS
WATT/1000=kW
(Load Current in amps) = (Load Wattage)/(Load Voltage)
Example:
250W, 120V floodlight load = 250W/120V= 2 amps (approx.)
NOTE:
Electric motors require much more current to start than to run.
Commonly, the current rating given on a motor nameplate is
the full load (running) current required by the motor, not its
starting current, which is a lot higher. Motor starting current
requirements vary greatly, by motor size and type. Repulsion-
induction type motors are the easiest to start, typically using 1
1/2 to 2 1/2 times as much current to start as to run; capacitor
type motors usually require 2 to 4 times as much current to
start as to run; split-phase type motors are the hardest to start,
normally using 5 to 7 times as much current to start as to run.
MOTORLOAD SINGLEPHASE
Motor Amps
Amps
Horsepower 115V 230V
(Running Amps)
1/4 5.8 2.9
1/3 7.2 3.6
1/2 9.8 4.9
3/4 13.8 6.9
1168
1-1/2 20 10
22412
33417
55628
7-1/2 80 40
Compiled from N.E.C. manual.
To use the full capacity of the generator without tripping its
circuit breaker(s), start the motors in the load one at a time,
highest starting current motor first, next highest second, etc.
Use the preceding table as a source of general information
about motor running current requirements. For more specific
information, see motor nameplate or motor manufacturer’s
catalog.
PRE-START CHECKS
WARNING: Personal Injury
When working on or around these generators, do not wear
loose fitting clothing or any articles that may get caught in
moving parts.
1. Visually inspect the generator. Check for:
a Correct mounting
b. Physical damage
c. Debris in cooling vents and screens (could
cause generator to overheat).
IMPORTANT: The manufacturer recommends that, if the gen-
erator has been stored for any length of time, before using it,
the operator remove the control box cover and cooling fan
screen, then inspect the generator for rodent nests or other
objects that could cause generator binding and/or overheat-
ing. See “Cleaning” portion of Maintenance section.
2. Check gear case oil level. (See Figure 6.) Case should be
filled with oil to plug marked “OIL LEVEL.” Fill or remove oil
as required.
NOTE:EITHERTOOLITTLEORTOOMUCHOILCANHARM
THEEQUIPMENT.
See “Lubrication” portion of Maintenance for oil specifications.

Page6 60706-133 8290-01
7. Check all electrical connections in the system to be ener-
gized by the generator. Make sure the connections are cor-
rect and are tight.
8. Make sure all loads are turned off. Do not start the genera-
tor under load.
GENERATORSTARTINGPROCEDURE
1. With the power take-off drive disengaged, start the engine
which will drive the generator. Run the engine long enough
to warm it up before proceeding, so that it will run smoothly
and achieve full power under generator load.
2. With engine idling, engage the power take-off drive.
3. Watch the voltmeter on the generator and slowly increase
engine speed until the output reaches approximately 260
volts, in green portion of voltmeter scale.
4. With engine and generator running smoothly, switch on
the electrical load while watching the voltmeter.
NOTE:EquipmentDamage
If the load includes motors turn them on one at a time, highest
starting current motor first, next highest second, etc.
Readjust engine throttle to keep generator output under load
at 240V (in green portion of voltmeter scale). If engine is
equipped with speed governor, it may automatically readjust
the throttle as the load changes and keep the generator output
at the proper level. However, some governors are not sensitive
enough to maintain proper output under changing load, and in
such cases the throttle will have to be manually readjusted .
GENERATORSHUTDOWNPROCEDURE
1. Switch off electrical load.
2. Reduce speed of engine driving generator to idle.
3. Disengage power take-off drive, and allow generator to
coast to a stop.
WARNING: Personal Injury
Never try to manually stop the generator. Always let it coast
until it stops.
5. Shut off the engine.
4. Disconnect drive shaft (tumbling bar)
power take-off end first, then generator end.
Figure 6
Figure 7
3. Make sure the drive shaft (tumbling bar) is assembled with
its universal joint knuckles “synchronized,” as illustrated in
Figure 7. If knuckles are not synchronized, the bar will chat-
ter when rotating, which will cause the generator output
voltage to flicker.
DANGER:PersonalInjury
POWER TAKE-OFF MUST BE DISENGAGED AT THIS TIME.
4. Couple the tractor to the generator with the drive shaft (tum-
bling bar). Couple the tumbling bar to the generator input
shaft first, then to the power take-off shaft. Check align-
ment, tractor, power take-off shaft (tumbling bar), and gen-
erator input shaft should form a straight (or nearly straight)
line, with less than 15° misalignment between the shafts.
Misalignment will cause generator output voltage to flicker.
CAUTION:
Make sure that all tumbling bar lock pins are engaged and
that all safety shields are in place before operating the PTO
generator.
5. Make sure no binding exists in generator or gear box. If
binding is found, locate the cause and correct it before pro-
ceeding.
6. Make sure that the electrical loads to be driven by the gen-
erator will not draw more current than the ratings of the
generator receptacle or cord set which will supply the cur-
rent.

Page760706-133 8290-01
MAINTENANCE
General Information
The main components of the generator are: armature, field
coils, cooling fan, brushes, brush holder assembly, end
brackets, rectifier and voltage regulator. Before performing
any maintenance on the generator, isolate and/or disable the
drive system so the unit can not be accidentally started while
being repaired.
The troubleshooting chart lists various symptoms of poor
generator operation with possible causes and the appro-
priate corrective action. You will need a volt-ohm meter or
test light to check some of the causes. For some of the
other causes you will need to check generator speed. To
check generator speed you can use a frequency meter, a
tachometer, or a 120V-60Hz electric clock and a correctly
operating wrist watch. (Run the electric clock on generator
power and compare the clock’s second hand movement
with that of the wrist watch. They should run at the same
speed. If clock runs faster, generator speed is too high,
and vice versa.)
CAUTION:EquipmentDamage
Most electrical equipment in North America operates
satisfactorily at frequencies between 58.5 and 62 Hz
(cycles per second.) Operating the generator at frequen-
cies outside that range may cause damage to the genera-
tor and/or to electrical equipment driven by the generator.
Periodical Maintenance
Service/maintenance items include periodic external physi-
cal inspection for missing hardware or damage to mounting
or drive system and checking the oil level in the gear case.
It is recommended that the generator be operated at least
monthly under normal loads to familiarize operators with the
procedures and controls as well as to dry out any accumu-
lated condensation or other moisture in the generator elec-
trical windings. The maintenance and service attention
invested will insure getting the peak performance that was
designed into the unit.
Routine preventive maintenance minimizes costly repairs
and generator down-time. Before each use, inspect the
generator: gear case oil level should be correct, cooling
vents and screens should be clear, and generator mount-
ing hardware should be tight. Clean and inspect the
generator after storing it for long periods, and after using
it in extremely dusty conditions or in severe weather, such
as rain or blowing snow.
Lubrication
The generator bearings are factory lubricated and sealed,
and require no further lubrication.
The generator input shaft should be cleaned and lubricated
with a thin film of grease before installing the drive shaft and
each time it is removed.
The drive shaft (tumbling bar) requires greasing. Keep the
universal joints in the coupling shaft free from grease and dirt
buildup.
NOTE:
Do not over lubricate the universal joints.
Check the generator gear case oil level before each use of
the generator. Maintain the oil level at oil level plug height.
(See page 6 for oil level plug location.) The generator is
shipped with lubricant in the gear case. Specifications for
gear case lubricant are:
API Service: GL-5
Grade: SAE 85W-9O-140
Amount: 2 pints
The following kinds of oil are recommended for use in the
generator gear case: Mobil SAE 85W90-140 API Service GL-
5, Sunoco/DX XL80W90-140 Kendal Three Star 85W-140,
Amoco 85W140 or equivalent.
CAUTION: Equipment Damage
Do not overfill generator gear case. Overfilling causes
overheating and oil seal failure.
Change the oil at least once every six months. Change it
more often if you use the generator in bad weather. Use the
following procedure to change generator gear case oil:
1. Remove gear case breather. Soak breather in cleaning
solvent, then allow it to dry.
2. Remove oil level check plug.
3. Remove the oil drain plug, drain the oil into a clean oil
resistant container, 1 quart or larger. Check the oil for
metal. Fine metal dust in the oil does not indicate
trouble, but metal chips do. Dismantle the gear case and
look for damaged gears if you find metal chips in the oil.
4. Replace the oil drain plug. Refill the gear case through
the breather port with new oil of the recommended type.
Fill the case up to oil level check plug height. (It will take
about 1 pint.)
5. Replace the oil level check plug.
6. Replace the breather
Cleaning and Inspection
Use a vacuum cleaner or dry low pressure compressed air
(regulated at 25-35 PSI) to clean the generator periodically.
WARNING
DO NOT CLEAN THE GENERATOR WHILE IT IS RUNNING.

Page8 60706-133 8290-01
Proceed as follows:
1. Remove control box cover. Vacuum or blow dust or de-
bris from the control box. Inspect all wiring for correct
routing, fraying insulation, and secure connections.
2. Remove end cover. Vacuum or blow dust and debris from
the inside of the generator. Inspect wiring for loose con-
nections, fraying insulation and correct wire routing.
3. Replace end cover and control box cover.
GENERATORSTORAGE
Before storing the generator, apply a heavy coat of grease to
the splined input shaft. Store the generator in a sheltered
area, where it is protected against snow, rain, and excessive
dust.
Generator Maintenance and Testing
A.Brushes
Under ordinary circumstances, brushes will operate for
extremely long periods without requiring replacement. They
should be inspected after the first 500 hours of operation,
and after every 200 hours of operation thereafter. Remove
brushes one at a time and check for length; be sure that each
moves freely in the brush holder. Brushes should be
replaced when worn down to 3/8”. Replace brushes in
complete sets, never singly. When replacing brushes, be
careful to reconnect the lead wires properly.
Poor contact (or “skipping”) between brush and slip ring is
caused by oil and grit, flint, or other hard substance on the
brush,or by the brushnot being properly shapedto fit the slip
rings. Remedy these defects by fitting the brushes to the
slip-ring curvature. Place # 00 sandpaper under the brushes
with the abrasive side to the brushes, and work it back and
forth until the brushes are the same shape as the slip-rings.
B. Slip rings
The four continuous copper rings located on the end of
the armature are the generator output slip rings. For
proper generator output, the surface of the slip rings must
have a smooth, shiny, highly polished finish. Normal
brush seating will transfer a shiny black finish that will
seat the copper surface. This finish should not be
removed unless it becomes dull or begins to build up.
Under sustained use, it is advisable to check and if
necessary, polish the ring surfaces with a crocus cloth to
maintain the smooth finish.
C. ElectricalTesting
Testing generator fields for opens and grounds.
1. Disconnect field leads from rectifier.
2. Set multimeter to read resistance, and connect the meter
leads to the field leads. If field is open, meter will read
infinite resistance (very high ohms). Repair or replace
field if it is open. Typical resistance for these fields vary
from 20.2 TO 22.4 ohms.
3. Leaving one meter lead connected to the field, connect the
other meter lead to the field shell. If meter indicates
continuity, any reading other than infinite resistance, the
field is grounded and should be repaired or replaced. To
determine which of the fields is grounded, cut the connec-
tor between the two coils and retest to determine which
coil has the low resistance path.
Testing the Armature for Opens and Grounds
1. Remove all brushes.
2. Ground fault test - set multimeter to read high resistance
(meg-ohms).Holding one meter lead against a clean spot
on the armature shaft, touch the other lead to each of the
slip rings (one at a time) while observing the meter. If
meter indicates continuity (any reading lower than one
meg-ohm), the armature is grounded. Dirt between the
slip rings and on the insulator surface can cause ground-
ing. If grounding was indicated, carefully clean all dirt off
the slip rings and their insulators and then recheck it. Re-
place the armature if it is grounded and unrepairable.

Page960706-133 8290-01
3. Open Test. Set meter to read low resistance (R x ohms).
Holding one meter lead on surface of slip ring No. 1,
touch other meter lead to surface of slip ring No. 2 while
observing the meter. Meter should indicate continuity (low
resistance - less than one ohm is typical). If the meter in-
dicates open circuit (infinite resistance) part of armature
winding is open. This may be caused by a repairable de-
fect in the connection at the slip ring, however generally
an open armature will have to be replaced. Continue
reading the continuity between slip ring No. 2 to No. 3 and
No.2 and No.4. All the slip rings should have continuity to
slip ring number 2, the neutral ring.
Testing Rectifiers
The field excitation is supplied through a full wave bridge
rectifier. This type of rectifier has four terminals, two AC, a
DC positive and a DC negative.
A rectifier may be tested in the following manner:
1. Tag and disconnect all leads from rectifier.
2. Connect the red ohmmeter lead to the positive DC (+)
terminal.
3. Connect the black lead to each of the AC terminals in turn.
Either a high or low resistance reading will be obtained.
4. Reverse the meter leads, black lead to the DC POS (+)
and red to the AC terminals, each in turn. An opposite
reading should be observed.
5. Connect the red ohmmeter lead to the negative DC (-)
terminal.
6. Connect the black lead to each of the AC terminals in turn.
Either a high or low resistance reading will be obtained.
7. Reverse the meter leads, black lead to the DC NEG (-) and
red to the AC terminals, each in turn. An opposite reading
should be observed.
8. Check each terminal to the case. An open circuit (very
high resistance) reading should be observed. A battery
powered test light may be used. Follow the same proce-
dures described above. A good diode element will allow
current to pass to the light in the test lamp in only one di-
rection.
9. If the rectifier fails any of the above tests, it should be
considered defective and replaced.
CondenserTesting
Condensers are built into the generator circuit to minimize
radio interference during operation. If a condenser shorts
out, it will also short out the generator output. To determine
whether a condenser is shorted, stop the generator and
disconnect the condenser lead wire from the brush holder.
Using a multimeter on the R x 100 scale, check the resis-
tance of the condenser. Normal response is a sharp swing
of the meter towards low resistance and then a steady rise
towards high resistance (open circuit). If the capacitor is
shorted it will show as a constant low resistance.
Otherwise, restart the generator without the capacitor con-
nectedto recheck the generator foroutput. If the generator then
provides power, the condenser was at fault and should be
replaced. (If the generator doesn't provide power, the problem
was not caused by that condenser, reconnect the lead wire).
If these tests have not located the trouble, remove the
armature and have it tested for opens, shorts, and grounds
on a growler.

225SouthCordovaAvenue
LeCenter,Minnesota 56057
507-357-6831
SYMPTOM CAUSE(S) CORRECTIVE ACTION
No output 1. Circuit breaker open. 1. Reset circuit breakers, replace if defective.
voltage. 2. Defective voltmeter. 2. Check output with another meter, replace meter if defective.
3. Short circuit in the load. 3. Disconnect the load. Check voltage at receptacle cord set.
Check motors, appliances and load leads for short circuit.
Repair short.
4. Defective receptacles. 4. Remove panel cover and check for voltage to the
receptacles. Replace defective receptacles.
5. Loose (or broken) wires or 5. Remove panel cover and check all wiring and connections.
connections in control box. Tighten and/or repair where necessary.
6. Defective rectifier. 6. Test rectifier. Replace if defective.
7. Dirty slip rings. 7. Clean and polish. Use 00 sandpaper or crocus cloth,
never use emery paper.
8. Brushes binding in holders. 8. Check brushes for swelling; replace defective brushes;
clean brush holders.
9. Shorted or open armature. 9. Measure armature resistance. Replace armature if open or
shorted.
10. Shorted or open field coils. 10. Measure between leads for open or short. Replace field coils if
defective.
Low voltage. 1. Engine speed too slow. 1. Check engine speed. Increase RPM if necessary.
2. Generator overloaded. 2. Reduce load if it is higher than the rated capacity of the
generator. (See generator nameplate).
3. Inadequate engine horsepower. 3. Generator requires 2.0 HP/1000 watts output. Obtain
larger engine if necessary.
4. Incorrect field excitation. 4. Check for worn brushes and weak or broken brush springs;
(No-load output low.) replace as required. Check input AC voltage to rectifier.
Check rectifier output DC voltage to positive DC brush. If no
DC voltage is present at the brush, replace the rectifier.
Check for dirty slip rings. Clean them if they are dirty.
High voltage. 1. Engine speed too fast. 1. Check engine speed for correct input RPM.
Output voltage 1. Tumbling bar (coupling shaft) 1. Reduce tumbling bar misalignment to less than 15 degrees.
flickering or misalignment.
fluctuation. 2. Engine speed not constant. 2. Engine governor may be worn or improperly adjusted. Set or
repair defective governor.
3. Loose connection in field circuit. 3. Check and tighten connections.
4. Tumbling bar U-joints not 4. Reassemble tumbling bar; see Figure 7.
synchronized.
Excessive 1. Power take-off misalignment 1. Correct misalignment. It should be less than 15 degrees.
vibration. excessive.
2. Loose mounting nuts and bolts 2. Tighten mounting nuts and bolts; repair hold-down stud
or hold-down studs. mountings.
3. Universal joints in coupling 3. Repair or replace defective parts.
shaft worn or dry.
4. Defective bearings. 4. Check for possible causes. Replace defective bearings.
Generator 1. Poor ventilation. 1. Clean ventilation and cooling fan screens.
overheating. 2. Generator overloaded. 2. Reduce load, then check voltage and current.
3. Shorted turns in field or 3. Replace defective components.
armature windings.
Oil leak. 1. Loose plug in gear case. 1. Tighten plug.
2. Defective seal, gasket, or 2. Replace seal(s), gaskets or plugs. Maintain correct oil level.
plug in gear case.
TROUBLE SHOOTING TABLE