Craftsman 917.377151 Bedienungsanleitung

Owner's Manual

JCRAFTSMAWJ

6.0 HORSEPOWER

22" REAR DISCHARGE

POWER PROPELLED

ROTARY LAWN MOWER

Model No.

917.377151

•Safety

•Assembly

•Operation

•Maintenance

•Espa_ol

•Repair Parts

CAUTION:

Read and follow all

Safety Rules and Instructions

before operating this equipment

Sears, Roebuck and Co., Hoffman Estates, IL 60179

Visit our Craftsman website: www.sears.com/craftsman

Warranty ............................................... 2

Safety Rules ......................................... 2

Assembly .............................................. 5

Operation .............................................. 6

Maintenance Schedule ...................... 10

Maintenance ....................................... 10

Product Specifications ........................ 11

Service and Adjustments .................... 14

Storage ............................................... 16

Troubleshooting ............................... ,. 17

Repair Parts ........................................ 37

Parts Ordering ..................... Back Cover

LIMITED TWO YEAR WARRANTY ON CRAFTSMAN POWER MOWER

For two years from date of purchase, when this Craftsman Lawn Mower is maintained,

lubricated, and tuned up according to the operating and maintenance instructions in

the owner's manual, Sears will repair free of charge any defect in material or workman-

ship.

If this Craftsman Lawn Mower is used for commercial or rental purposes, this warranty

applies for only 90 days from the date of purchase.

This Warranty does not cover:

• Expendable items which become worn during normal use, such as rotary mower

blades, blade adapters, belts, air cleaners and spark plug.

• Repairs necessary because of operator abuse or negligence, including bent

crankshafts and the failure to maintain the equipment according to the instructions

contained in the owner's manual.

Warranty service is available by returning the Craftsman power mower to the nearest

Sears Service Center/Department in the United States. This warranty applies only

while this product is in use in the United States.

This Warranty gives you specific legal rights, and you may also have other rights which

vary from state to state.

SEARS, ROEBUCKAND CO., D/817 WA, HOFFMAN ESTATES, ILLINOIS 60179

IMPORTANT: This cutting machine is capable of amputating hands and feet and

throwing objects. Failure to observe the following safety instructions could result in

serious injury or death.

I.GENERAL OPERATION

•Read, understand, and follow all

instructions on the machine and in the

manual(s) before starting. Be thor-

oughly familiar with the controls and the

proper use of the machine before

starting.

•Do not put hands or feet near or under

rotating parts. Keep clear of the

discharge opening at all times.

• Only allow responsible individuals, who

are familiar with the instructions, to

operate the machine.

• Clear the area of objects such as rocks,

toys, wire, bones, sticks, etc., which

could be picked up and thrown by the

blade.

• Be sure the area is clear of other

people before mowing. Stop machine if

anyone enters the area.

• Do not operate the mower when

barefoot or wearing open sandals.

Always wear substantial foot wear.

• Do not pull mower backwards unless

absolutely necessary. Always look

down and behind before and while

moving backwards.

•Do r_ot operate the mower with(?ut

proper guards, plates, grass catcher or

other safety protective devices in place.

•See manufacturer's instructions for

proper operation and installation of

accessories. Only use accessories

approved by the manufacturer.

•Stop the blade(s) when crossing gravel

drives, walks, or roads.

•Stop the engine (motor) whenever you

leave the equipment, before cleaning

the mower or unclogging the chute.

•Shut the engine (motor) off and wait

until the blade comes to complete stop

before removing grass catcher.

•Mow only in daylight or good artificial

light.

• Do not operate the machine while

under the influence of alcohol or drugs.

• Never operate machine in wet grass.

Always be sure of your footing: keep a

firm hold on the handle and walk; never

run.

• Disengage the self-propelled mecha-

nism or drive clutch on mowers so

equipped before starting the engine

(motor).

• If the equipment should start to vibrate

abnormally, stop the engine (motor)

and check immediately for the cause.

Vibration is generally a warning of

trouble.

• Always wear safety goggles or safety

glasses with side shields when operat-

ing mower.

II. SLOPE OPERATION

Slopes are amajor factor related to slip

and fall accidents which can result in

severe injury. All slopes require extra

caution. If you feel uneasy on a slope, do

not mow it.

DO-

,Mow across the face of slopes: never

up and down. Exercise extreme caution

when changing direction on slopes.

•Remove obstacles such as rocks, tree

limbs, etc.

• Watch for holes, ruts, or bumps. Tall

grass can hide obstacles.

DO NOT-

• Do not trim near drop-offs, ditches or

embankments. The operator could lose

footing or balance.

• Do not trim excessively steep slopes,

• Do not mow on wet grass. Reduced

footing could cause slipping.

III. CHILDREN

Tragic accidents can occur if the operator

is not alert to the presence of children.

Children are often attracted to the

machine and the mowing activity. Never

assume that children will remain where

you last saw them.

•Keep children out of the trimming area

and under the watchful care of another

responsible adult.

•Be alert and turn machine off if children

enter the area.

•Before and while walking backwards,

look behind and down for small

children.

•Never allow children to operate the

machine.

• Use extra care when approaching

blind corners, shrubs, trees, or other

objects that may obscure vision.

IV. SERVICE

• Use extra care in handling gasoline

and other fuels. They are flammable

and vapors are explosive,

-Use only an approved container.

-Never remove gas cap or add fuel

with the engine running, Allow

engine to cool before refueling. Do

not smoke.

-Never refuel the machine indoors.

- Never store the machine or fuel

container inside where there is an

open flame, such as a water heater.

•Never run a machine inside a closed

area.

•Never make adjustments or repairs

with the engine (motor) running.

Disconnect the spark plug wire, and

keep the wire away from the plug to

prevent accidental starting.

• Keep nuts and bolts, especially blade

attachment bolts, tight and keep

equipment in good condition.

• Never tamper with safety devices.

Check their proper operation regularly.

• Keep machine free of grass, leaves, or

other debris build-up. Clean oil or fuel

spillage. Allow machine to cool before

storing.

• Stop and inspect the equipment if you

strike an object. Repair, if necessary,

before restarting.

• Never attempt to make wheel height

adjustments while the engine (motor) is

running,

•Grass catcher components are subject

to wear, damage, and deterioration,

which could expose moving parts or

allow objects to be thrown. Frequently

che_k components and replace with

manufacturer's recommended parts,

when necessary.

• Mower blades are sharp and can cut.

Wrap the blade(s) or wear gloves, and

use extra caution when servicing them.

• Do not change the engine governor

setting or overspeed the engine,

_Look for this symbol to point out

important safety precautions. It means

CAUTIONI!! BECOMEALERTH! YOUR

SAFETY IS INVOLVED.

WARNING: In order to prevent

accidental starting when setting up,

transporting, adjusting or making repairs,

always disconnect spark plug wire and

place wire where it cannot contact spark

plug.

_,WARNING: Engine exhaust, some of its

constituents, and certain vehicle compo-

nents contain or emit chemicals known to

the State of California to cause cancer

and birth defects or other reproductive

harm.

• I,WARNING: Battery posts, terminals and

related accessories contain lead and

lead compounds, chemicals known to the

State of California to cause cancer and

birth defects or other reproductive harm.

Wash hands after handling.

These accessories were available when this lawn mower was produced. They are not

shipped with your mower. They are also available at most Sears retail outlets and

service centers. Most Sears stores can also order repair parts for you, when you

provide the model number of your lawn mower. Some of these accessories may not

apply to your lawn mower.

LAWN MOWER PERFORMANCE

CLIPPING DEFLECTOR

FOR REAR DISCHARGE LAWN MOWERS

GRASS CATCHERS

FOR

REAR DISCHARGE

LAWN MOWERS

MULCHER KITS

GRASS CATCHERS

FOR

SIDE DISCHARGE

LAWN MOWERS

STABILIZER

GAS CANS

LAWN MOWER MAINTENANCE

MUFFLERS AIR FILTERS

BELTS BLADES BLADE ADAPTERS WHEELS

SPARK PLUGS

ENGINE OIL

Read these instructions and this manual

in its entirety before you attempt to

assemble or operate your new lawn

mower.

IMPORTANT: This lawn mower is shipped

WITHOUT OIL OR GASOLINE in the

engine.

Your new lawn mower has been as-

sembled at the factory with the exception

of those parts left unassembled for

shipping purposes. All parts such as nuts,

washers, bolts, etc., necessary to com-

plete the assembly have been placed in

the parts bag. To ensure safe and proper

operation of your lawn mower, all parts

and hardware you assemble must be

tightened securely. Use the correct tools

as necessary to ensure proper tightness.

TO REMOVE LAWN MOWER FROM

CARTON

1. Remove loose parts included with

mower.

2, Cut down two end corners of carton

and lay end panel down flat.

3. Remove all packing materials except

padding between upper and lower

handle and padding holding operator

presence control bar to upper handle.

4. Roll lawn mower out of carton and

check carton thorougly for additional

loose parts.

HOW TO SET UP YOUR LAWN

MOWER

TO UNFOLD HANDLE

IMPORTANT: Unfold handle carefully so

as not to pinch or damage control cables.

1. Raise handles until lower handle

section locks into place in mowing

position.

2. Remove protective padding, raise

upper handle section into place on

lower handle and tighten both handle

knobs.

3. Remove handle padding holding

operator presence control bar to

upper handle.

Your lawn mower handle can be adjusted

for your mowing comfort. Refer to "Adjust

Handle" in the Service and Adjustments

section of this manual.

Operator presence

control bar

Upper handle

Lift up

Mowing

position

Lower handle

TO INSTALL ATTACHMENTS

Your lawn mower was shipped ready to

be used as a mulcher. To convert to

bagging or discharging:

• Open rear door and remove mulcher

plug. Store mulcher plug in asafe

place.

•You can now install catcher or

optional clipping deflector.

•To return to mulching operation, install

mulcher plug into discharge opening

of mower.

_CAOTION: Do not run your lawn mower

without mulcher plug in place or ap-

proved clipping deflector or grass catcher

in place. Never attempt to operate the

lawn mower with the rear door removed

or propped open.

Mulcher plug

KNOW YOUR LAWN MOWER

READ THIS OWNER'S MANUALAND SAFETY RULES BEFORE OPERATING YOUR

LAWN MOWER. Compare the illustrations with your lawn mower to familiarize yourself

with the location of various controls and adjustments. Save this manual for future

reference.

These symbols may appear on your lawn mower or in literature supplied with the

product. Learn and understand there meaning.

CAUTION ENGINE ENGINE FAST SLOW CHOKE FUEL OIL DANGER, KEEP HANDS

OR WARNING ON OFF AND FEET AWAY

Engine zone

control cable

Throttle Control

Operator presence control bar

Drive control lever

Starter handle

Grass catcher_

Mulcher plug

Handle knob

Engine oil

dipstick

Housing

cover

Gasoline cap

Primer

IMPORTANT: This lawn mower is

shipped WITHOUT OIL OR GASOLINE in

the engine.

_Wheel adjuster

(on each wheel)

MEETS CPSC SAFETY REQUIREMENTS

Sears rotary walk-behind power lawn mowers conform to the safety standards of the

American National Standards Institute and the U.S. Consumer Product Safety Commis-

sion. The blade turns when the engine is running.

Operator presence control bar -must

be held down to the handle to start the

engine. Release to stop the engine,

Primer - pumps additional fuel from the

carburetor to the cylinder for use when

starting a cold engine.

Starter handle -used for starting the

engine.

Drive control lever -used to engage

power-propelled forward motion of lawn

mower.

Mulcher plug - must be removed to

convert to bagging or discharging

operation.

Throttle Control - used for starting the

engine and allows you to select either

6fast or slow engine speed.

Theoperation of any lawn

mower can result in

foreign objects thrown into

the eyes, which can result

in severe eye damage.

Always wear safety glasses or eye

shields while operating your lawn mower

or performing any adjustments or repairs.

We recommend a wide vision safety

mask over spectacles or standard safety

glasses.

HOW TO USE YOUR LAWN MOWER

ENGINE SPEED

The engine speed is controlled by a

throttle located on the side of the upper

handle. Fast position is for starting, normal

cutting, trimming and better grass bag-

ging. Slow position is for light cutting,

trimming and fuel economy.

Slow

Fast

ENGINE ZONE CONTROL

ACAUTION: Federal regulations require

an engine control to be installed on this

lawn mower in order to minimize the risk

of blade contact injury. Do not under any

cimumstances attempt to defeat the

function of the operator control. The blade

turns when the engine is running.

•Your lawn mower is equipped with an

operator presence control bar which

requires the operator to be positioned

behind the lawn mower handle to start

and operate the lawn mower.

TO ADJUST CUTTING HEIGHT

Raise wheels for low cut and lower

wheels for high cut, adjust cutting height

to suit your requirements. Medium

position is best for most lawns.

•To change cutting height, squeeze

adjuster lever toward wheel. Move

wheel up or down to suit your require-

ments. Be sure all wheels are in the

same setting.

NOTE: Adjuster is properly positioned when

plate tab inserts intohole in lever.Also, 9-

position adjusters (if so equipped) allow lever

to be positionedbetween the plate tabs.

Plate Tab

Lower Wheels for High Cutr--_._.AlgP

_(_ .,._ _ Lever

Raise Wheels for Low Cut

TO ATTACH GRASS CATCHER

1. Lift the rear door of the lawn mower

and place the grass catcher frame

side hooks onto the door pivot pins.

2. The grass catcher is secured to the

lawn mower housing when the rear

door is lowered onto the grass catcher

frame.

ACAUTION: Do not run your lawn

mower without clipping deflector or

approved grass catcher in place. Never

attempt to operate the lawn mower with

the rear door removed or propped open.

Rear door

Grass

catcher

handle

Pivot

pins frame hook

TO EMPTY GRASS CATCHER

1. Lift up on grass catcher using the

frame handle.

2. Remove grass catcher with clippings

from under lawn mower handle.

3. Empty clippings from bag using both

frame handle and bag handle.

NOTE: Do not drag the bag when

emptying; it will cause unnecessary wear.

Bac

handle

(Grass

catcher

frame

handle

DRIVE CONTROL

• Self-propelling is controlled by holding

the operator presence control bar down

to the handle and pushing the drive

control lever forward until it clicks; then

releasing the lever.

• Forward motion will stop when the

operator presence control bar is

released. To slop forward motion

without stopping engine, release the

operator presence control bar slightly

until the drive control disengages. Hold

operator presence control bar down

against handle to continue mowing

without self-propelling

• To keep drive control engaged when

turning corners, push down on handle

and lift front wheels off ground while

turning lawn mower.

Operator presence control bar Drive

_ control

To engage Drive control

drive control disengaged

BEFORE STARTING ENGINE

ADD OIL

Your lawnmower is shipped without oil in

the engine. Engine holds 20 oz. of oil.

For type and grade of oil to use, see

"ENGINE" in Maintenance section of this

manual.

1. Be sure lawnmower is level and area

around oil fill is clean.

2. Remove engine oil cap and fill to the

full line on the dipstick. Pour oil slowly.

Do not over fill.

NOTE: Allow oil to settle down into engine

for accurate dipstick reading. To read

proper level, tighten engine oil cap, then

remove it to read the dipstick.

3. Reinstall engine oil cap and tighten.

• Check oil level before each use. Add

oil if needed. Fill to full line on dipstick.

• Change the oil after every 25 hours of

operation or each season. You may

need to change the oil more often under

dusty, dirty conditions.

ADD GASOLINE

NOTE: Before filling fuel tank, remove

and discard the debris plug that is inside

the tank.

•Fill fuel tank. Use fresh, clean, regular

unleaded gasoline with a minimum of

87 octane. Do not mix oil with gaso-

line. Purchase fuel in quantities that

can be used within 30 days to assure

fuel freshness.

,_WARNING: Experience indicates that

alcohol blended fuels (called gasohol or

using ethanol or methanol) can attract

moisture which leads to separation and

formation of acids during storage. Acidic

gas can damage the fuel system of an

engine while in storage. To avoid engine

problems, the fuel system should be

emptied before storage of 30 days or

longer. Drain the gas tank, start the

engine and let it run until the fuel lines

and carburetor are empty. Use fresh fuel

next season. See Storage instructions for

additional information. Never use engine

or carburetor cleaner products in the fuel

tank or permanent damage may occur.

_, CAUTION: Fill to bottom of gas tank

filler neck. Do not overfill. Wipe off any

spilled oil or fuel. Do not store, spill or

use gasoline near an open flame.

Gasoline filler cap Engine oil cap

(Discard

debris plug

inside)

TO START ENGINE

NOTE: Due to protective coatings on the

engine, a small amount of smoke may be

present during the initial use of the

product and should be considered

normal.

1. To start a cold engine, push primer

three (3) times before trying to start.

Use a firm push. This step is not

usually necessary when starting an

engine which has already run for a

few minutes.

2. Move throttle control lever to fast

position.

3. Hold operator presence control bar

down to the handle and pull starter

handle quickly. Do not allow starter

rope to snap back.

TO STOP ENGINE

•To stop engine, release operator

presence control bar.

NOTE: In cooler weather it may be

necessary to repeat priming steps. In

warmer weather over priming may cause

flooding and engine will not start. If you

do flood engine, wait a few minutes

before attempting to start and do not

repeat priming steps.

MOWING TIPS

•Under certain conditions, such as very

tall grass, it may be necessary to raise

the height of cut to reduce pushing

effort and to keep from overloading the

engine and leaving clumps of grass

clippings. It may also be necessary to

reduce ground speed and/or run the

lawn mower over the area a second

time.

• For extremely heavy cutting, reduce the

width of cut by overlapping previously

cut path and mow slowly.

•For better grass bagging and most

cutting conditions, the engine speed

should be set in the fast position.

•When using a rear discharge lawn

mower in moist, heavy grass, clumps of

cut grass may not enter the grass

catcher. Reduce ground speed

(pushing speed) and/or run the lawn

mower over the area a second time.

• If a trail of clippings is left on the right

side of a rear discharge mower, mow in

a clockwise direction with asmall

overlap to collect the clippings on the

next pass.

•Pores in cloth grass catchers can

become filled with dirt and dust with

use and catchers will collect less grass.

To prevent this, regularly hose catcher

off with water and let dry before using.

•Keep top of engine around starter clear

and clean of grass clippings and chaff.

This will help engine air flow and

extend engine life.

MULCHING MOWING TIPS

IMPORTANT: For best performance,

keep mower housing free of built-up

grass and trash. See =Cleaning" in

Maintenance section of this manual,

• The special mulching blade will recut

the grass clippings many times and

reduce them in size so that as they fall

onto the lawn they will disperse into the

grass and not be noticed. Also, the

mulched grass will biodegrade quickly

to provide nutrients for the lawn.

Always mulch with your highest engine

(blade) speed as this will provide the

best recutting action of the blades.

• Avoid cutting your lawn when it is wet.

Wet grass tends to form clumps and

interferes with the mulching action.

The best time to mow your lawn is the

early afternoon. At this time the grass

has dried and the newly cut area will

not be exposed to the direct sun.

• For best results, adjust the lawn mower

cutting height so that the lawn mower

cuts off only the top one-third of the

grass blades. If the lawn is overgrown

it will be necessary to raise the height

of cut to reduce pushing effort and to

keep from overloading the engine and

leaving clumps of mulched grass. For

extremely heavy mulching, reduce your

width of cut by overlapping previously

cut path and mow slowly.

• Certain types of grass and grass

conditions may require that an area be

mulched a second time to completely

hide the clippings. When doing a

second cut, mow across or perpendicu-

lar to the first cut path.

• Change your cutting pattern from week

to week. Mow north to south one week

then change to east to west the next

week. This will help prevent matting

and graining of the lawn.

Max 1/3

A,NTENANO SO.EDOL

REGULAR SERVICE

Check for LooseFasteners II/li/

Clean/Inspect Grass Catcher

(If Equipped) I_ _ i_

MClean Lawn Mower

wO Clean Under Drive Cover

(Power-Propelled Mowers) lip

Check drive belt/pulleys

RE (Power-Propelled Mowers) II/

Check/Sharpen/Replace Blade I,#"3

Lubrication Chart I#rIf

Clean Battery/Recharge

(Electric Start Mowers) I/ I/'4

I:: Check Engine Oil Level I/

NChange Engine Oil _1,2

Gclean Air Filter Ill' 2

InspectMuffler

N Clean or Replace Spark Plug

Replace Air Filter Paper Cartridge I/2

1-Change more often when operating under a heavy load or in high ambient temperatures.

2-Service more olten when operating in didy or dusty conditions.

3 - Replace blades more elten when mowing in sandy soil.

4 - Charge 48 hours at end of season.

GENERAL RECOMMENDATIONS

The warranty on this lawn mower does

not cover items that have been subjected

to operator abuse or negligence. To

receive full value from the warranty,

operator must maintain mower as

instructed in this manual.

Some adjustments will need to be made

periodically to properly maintain your unit.

All adjustments in the Service and

Adjustments section of this manual should

be checked at least once each season.

•Once a year, replace the spark plug,

clean or replace air filter element and

check blade for wear. A new spark plug

and clean/new air filter element assures

proper air-fuel mixture and helps your

engine run better and last longer.

• Follow the maintenance schedule in

this manual.

BEFORE EACH USE

1. Check engine oil level.

2. Check for loose fasteners.

LUBRICATION

Keep unit well lubricated (See "LUBRICA-

TION CHART").

IMPORTANT: Do not oil or grease

plastic wheel bearings, viscous lubri-

cants will attract dust and dirt that will

shorten the life of the self-lubricating

bearings, if you feel they must be

lubricated, use only a dry, powdered

graphite type lubricant sparingly.

LUBRICATION CHART

_) Wheel adjuster (_) Engine oil

door hinge

bracket mounting pin

(D Refer to maintenance "Engine"

section.

(_) Spray lubricant

Inhaltsverzeichnis

Andere Craftsman Rasenmäher Handbücher

Craftsman

Craftsman 917.375622 Bedienungsanleitung

Craftsman

Craftsman 917.252451 Bedienungsanleitung

Craftsman

Craftsman 917.372780 Bedienungsanleitung

Craftsman

Craftsman 917.275241 Bedienungsanleitung

Craftsman

Craftsman 917.272057 Bedienungsanleitung

Craftsman

Craftsman 917.385191 Bedienungsanleitung

Craftsman

Craftsman 917.27582 Bedienungsanleitung

Craftsman

Craftsman 917.371351 Bedienungsanleitung

Craftsman

Craftsman 917.273802 Bedienungsanleitung

Craftsman

Craftsman 917.388841 Bedienungsanleitung

Craftsman

Craftsman 917.276140 Bedienungsanleitung

Craftsman

Craftsman 917.370670 Bedienungsanleitung

Craftsman

Craftsman 917.376581 Bedienungsanleitung

Craftsman

Craftsman CMCMW270Z1 Bedienungsanleitung

Craftsman

Craftsman 917.99047 Bedienungsanleitung

Craftsman

Craftsman 917.376570 Bedienungsanleitung

Craftsman

Craftsman 917.251482 Bedienungsanleitung

Craftsman

Craftsman 917.389260 Bedienungsanleitung

Craftsman

Craftsman 247.37033 Bedienungsanleitung

Craftsman

Craftsman 917.388800 Bedienungsanleitung

Craftsman

Craftsman 917.28857 Bedienungsanleitung

Craftsman

Craftsman 917.273751 Bedienungsanleitung

Craftsman

Craftsman 917.250551 Bedienungsanleitung

Craftsman

Craftsman 247.289150 Bedienungsanleitung

Beliebte Rasenmäher Handbücher anderer Marken

RHINO

RHINO 1958 Bedienungsanleitung

Wolf Garten

Wolf Garten Compact plus 40 B Bedienungsanleitung

Cub Cadet

Cub Cadet LTX 1045 Bedienungsanleitung

GGP ITALY SPA

GGP ITALY SPA CR/CS 434 SERIES Bedienungsanleitung

Challenge

Challenge CH18V2 Betriebsanleitung

TALEN TOOLS

TALEN TOOLS AVR HGM30 Bedienungsanleitung

DEWEZE

DEWEZE ATM-725 Bedienungsanleitung

Weed Eater

Weed Eater 180083 Bedienungsanleitung

Husqvarna

Husqvarna Poulan Pro PP185A42 Bedienungsanleitung

Better Outdoor Products

Better Outdoor Products Quick Series Bedienungsanleitung

Cub Cadet

Cub Cadet 23HP Z-Force 60 Betriebsanleitung

MTD

MTD 795, 792, 791, 790 Bedienungsanleitung

Toro

Toro Groundsmaster 3505-D Bedienungsanleitung

Dennis

Dennis FT 610 Bedienungsanleitung

AIRFORCE

AIRFORCE F-15 Gen 3 Bedienungsanleitung

MTD

MTD 126-220-000 Bedienungsanleitung

Toro

Toro 74806 Bedienungsanleitung

Stihl

Stihl RMA 443 PV Bedienungsanleitung