Furukawa Unic URW376C4U -T Series Manual

SERIES
OMURW376C4U-T201505A
PRINTED IN JAPAN
OPERATION
&
MAINTENANCE
MANUAL
MINI-CRAWLER CRANE
HEAD OFFICE : Nihonbashi nishikawa Bldg, 5-3, Nihonbashi
1-chome, Chuo-ku, Tokyo 103-0027, Japan
MODEL

0-1
INTRODUCTION
Request to those who operate the crane
MODEL
SPEC.
CODE NO.
SERIAL NO.
CAPACITY
TOKYO JAPAN
MADE IN JAPAN
LBS
Crane model URW376C4U
Specification
Crane capacity
Serial number
Code number
The operator’s manual describes correct operation methods, simple inspection, and ser-
vice for the UNIC crane.
Be sure to read this manual carefully to carry out correct and safe operation of the crane.
Operate the crane after you have understood the contents of this manual.
Although we take all possible measures to ensure quality of the crane, you are requested
to contact our business offices, UNIC sales agents, or authorized service stations when-
ever you have anything you do not understand.
◆ For making inquiries
◆Name plate of the machine is located at the side of column.
◆When making inquiries, ordering spare parts, and requesting repairs, be sure to inform us
of the crane model, specification, serial number, and code number which are indicated on
the name plate.

0-2
TABLE OF CONTENTS
8. HOW TO REFER TO WORKING
RANGE CHART AND RATED LOAD
CHART
󱯎Working range chart ……………………… 8- 1
󱯐Rated load chart …………………………… 8- 2
9. DESCRIPTION OF EACH
CONTROL DEVICE
󱯎Overwinding alarm ………………………… 9- 1
󱯐Automatic stop for overwinding …………… 9- 2
󱯒Boom angle chart ………………………… 9- 4
󱯔Warning horn ……………………………… 9- 8
󱯖Retaining mechanism for slinging wire rope 9- 8
󱯘Automatic stop for leaving minimum wire rope
(With wire rope retaining roller) …………… 9- 8
󱯚Load meter ………………………………… 9- 9
󱯜Specifications on turn over prevention device … 9-11
10. HOW TO OPERATE CARRIER
󱯎Designation of each control lever
and its location…… 10- 1
󱯐Preparation before operation ……………… 10- 2
󱯒Precautions before operation
(air-bleeding procedures) …… 10- 5
󱯔How to operate …………………………… 10- 6
󱯖How to Crawl ……………………………… 10- 9
󱯘How to fasten carrier when in transportation 10-14
11. HOW TO OPERATE CRANE
󱯎Designation of each control lever
and its location……… 11- 1
󱯐Preparation before operation ……………… 11- 2
󱯒Procedures to set up outriggers …………… 11- 3
󱯔How to operate boom for derricking
(raising and lowering) …… 11- 7
󱯖How to hoist and lower the hook …………… 11- 8
󱯘How to telescope boom …………………… 11-10
󱯚How to slew boom ………………………… 11-12
SETUP OF THIS MANUAL
󱯎URW376C4U-T series …………………… 0- 4
1. FOR SAFETY OPERATION
󱯎Request to customers ……………………… 1- 1
2. SAFETY PRECAUTIONS ON
CARRIER OPERATION
󱯎Before operation …………………………… 2- 1
󱯐During operation …………………………… 2- 2
󱯒When loading and unloading ……………… 2- 4
󱯔After operation …………………………… 2- 4
3. SAFETY PRECAUTIONS ON
CRANE OPERATION
󱯎Before operation …………………………… 3- 1
󱯐During operation …………………………… 3- 2
󱯒After operation …………………………… 3- 4
4. DESCRIPTION OF CARRIER
EQUIPMENT ……………………… 4- 1
5. DESCRIPTION OF CRANE
EQUIPMENT ……………………… 5- 1
6. NAME PLATES
󱯎Description of name plates (Stickers) ……… 6- 1
󱯐Stickers in detail …………………………… 6- 2
7. DEFINITION OF TERMS
󱯎Outrigger extension………………………… 7- 1
󱯐How boom-sections are extended ………… 7- 3
󱯒Net rated load ……………………………… 7- 4
󱯔Rated load ………………………………… 7- 4
󱯖Lifting capacity …………………………… 7- 4
󱯘Working radius …………………………… 7- 4
󱯚Boom length ……………………………… 7- 4
󱯜Boom angle………………………………… 7- 4
󱯞Lift above ground ………………………… 7- 4

0-3
TABLE OF CONTENTS
󱯜How to store crane ………………………… 11-14
󱯞Procedures for storing hook………………… 11-15
󱯠How to store outriggers …………………… 11-17
12. MAINTENANCE AND
INSPECTION OF CARRIER
󱯎Inspection before operation ………………… 12- 2
󱯐Inspection and Maintenance which is to be carried
out every 250 hours or 3 months …………… 12-13
󱯒Inspection and Maintenance which is to be carried
out every 500 hours or 6 months …………… 12-21
󱯔Inspection and Maintenance which is to
be carried out every 1000 hours or 12 months 12-23
󱯖Non-regular maintenance ………………… 12-29
󱯘Storage …………………………………… 12-34
󱯚Fitting safety covers ……………………… 12-35
󱯜Maintenance and inspection of engine……… 12-35
13. MAINTENANCE AND
INSPECTION OF CRANE
󱯎Inspection before operation ………………… 13- 2
󱯐Cleaning …………………………………… 13- 3
󱯒Inspection of bolts mounting
slewing bearings …… 13- 3
󱯔Replacement of wire rope (for winding-up)… 13- 4
󱯖Replacement of expendable parts ………… 13- 8
14. WATER SUPPLY AND
LUBRICATION TO CARRIER
󱯎Precaution when
carrying out filling water and lubrication …… 14- 1
󱯐List of recommended lubricant …………… 14- 2
󱯒Filling water and lubrication chart ………… 14- 4
15. LUBRICATION TO CRANE
󱯎Precaution when
carrying out lubrication …………………… 15- 1
󱯐List of recommended lubricant …………… 15- 2
󱯒Lubrication chart …………………………… 15- 3
󱯔Lubrication ………………………………… 15- 4
16. MAJOR SPECIFICATIONS
󱯎URW376C4U-T(6-section boom) ………… 16- 1

0-4
SETUP OF THIS MANUAL
SETUP OF THIS MANUAL
Performance of the crane covered in this manual have some difference in accordance
with the boom sections. If there is any difference in performance, the specifications are
explained separately according to each boom section.
URW376C4U-T series of crane model is to be designated according to the number of
sections of telescoping boom.
1. Designation of model
󱯎URW376C4U-T series
(Model) (Number of boom section)
URW376C4U-T 6

1-1
1. FOR SAFETY OPERATION
󱯎Request to customers
★Read preventive measures
against danger and cautions
stated in this manual for proper
understanding.
★Most accidents related to the
crane occur due to operation,
maintenance, and inspection
which have failed in observing
basic safety regulations.
… Failure to observe this may invite an accident resulting in injury or death.
CAUTION … Failure to observe this may cause damage to the crane.
◆Store this operator’s manual where it is easily accessible to read it over and over again.
◆Failure to observe the right operation and maintenance/inspection illustrated in
this manual may cause trouble in the crane and may invite an accident, and this
will not only shorten its service life but will impair safety in the crane operation.
Please remember, in such cases, that no warranty will be given even if the crane is within
valid warranty period.
◆In order to prevent injury or death to crane operators and to those who stand close to crane
operating area due to operational mistake, caution plates are stuck on the crane.
You are requested to read them carefully.
◆Do not alter the crane.
★If you want to make an alteration, contact with UNIC sales agent or an authorized service
shop.
★UNIC does not bear any responsibility for troubles and /or accidents due to unauthorized
alteration.
Observeallthesafetyregulations!
◆Never failed to observe and CAUTION described in the manual as
they are of great importance in safety and the crane operation.

MEMO

2-1
2. SAFETY PRECAUTIONS ON CARRIER OPERATION
󱯎Before operation
★Observe the cautions for securing safety.
Failure to observe the cautions may cause trouble or serious accident.
2 Be sure to make inspection before operation and periodical voluntary
inspection.
If found something wrong, repair it immedi-
ately.
3 The crane is prohibited to crawl on a public road by the road traffic law.
1 Dress neatly and wear protectors such as helmet, safety shoes, and gloves without
fail.
★Do not wear baggy clothes and accessories
which can be caught by control levers and fit-
tings, and oil-stained working clothes which
may catch fire.
WARNING
4 Check that no safety covers have been left removed.
★It is very dangerous to start the engine,
to operate the crane with the safety cover
removed as the driving mechanism is
exposed.
5 Be sure to stop the engine before refuel- ing or supplying and changing lubricant.
A fire source such as smoking cigarette in
mouth is strictly prohibited.
Failure to observe this may cause a fire.
6 When starting the engine in a small lim- ited area or indoors, open the windows
and doors for well ventilation.
★Poor ventilation may invite an exhaust gas
poisoning.
7 Shift the interlock for crane-crawl lever to “Crawl” when crawling the crane.
★Crane will not work by controlling crane
operation levers with the interlock for crane-
crawl lever shifted to “Crawl”.
Pedal
Crawling
Interlock for crane-crawl
operation
Crawling lever

2-2
SAFETY PRECAUTIONS ON CARRIER OPERATION
2 When crawling the crane, be sure to put outriggers in a condition of being stored
and store the hook.
1 The machine employs particularly small truck to facilitate working in a restrict-
ed space.
Since high performance crane is mounted on
the small truck, it has been built with a higher
center of gravity.
★Take special care not to overturn the crane
when crawling on a unleveled ground.
󱯐During operation
4 Special care must be taken to run the crane slowly when making a quick turn
and crawling on a rough road.
5 When running over a bump, be sure to slow down the crane and direct it
straight to the bump to avoid unnecessary
shock to the crane body.
7 Be sure to use a foot-board to run over a ramp of more than 0.5ft(15cm).
8 Crawl the crane with low (1st) speed gear on a slope.
9 Be sure to use a pallet against the rub- ber crawler when parking the crane on
a slope.
10 Do not make an abrupt stop and start, and change a course on a slope.
11 When crawling up and down a slope, operate the crane by standing
at a higher position than the crane body.
12 Do not operate the carrier on the more steep slope than shows below,
as there is a risk of roll-over.
Less than 20°
Less
than
23°
Less than 10 °
on the unstable road
Less than
10°
Less than
0.6ft
(170 mm)
Move forwards and backwards
(straight)
When driving over a gap of the step, there is a risk of tipping
over caused by vibration or a shock. Therefore, make sure
the gradient of carrier is less than 10°, or the gap of the step
is less than 0.6ft (170 mm). The driving speed should be
“Very Low Speed” and sudden turning is strictly prohibited.
Left/Right gradients
Drive over a gap of the
step with either left or
right side of the carrier
・
6 When driven over an irregular road sur- face or going up and down the slopes,
the carrier must get over the slope straight and
try not to give any shocks to it.
3 Do not run the crane with a cargo hoist- ed or without the crane being stored.

2-3
SAFETY PRECAUTIONS ON CARRIER OPERATION
13 Do not run the crane over bumpy area, lying rocks with sharp edges,
rough solid rock, small broken stones, edges
of steel plate, steel bars for reinforcement,
scrap metals, and waste materials and on a
road such as in riverside where covered with
many stones which may remarkably shorten
service life of rubber crawler.
14 Do not take an article or an animal in the crane.
★It may invite critical situation due to
abrupt swing or shift of center of gravity.
15 Do not park the crane over a place where withered grass or straw are
being spread.
★It may cause a fire by heat of exhaust pipe
or exhaust gas.
16 Do not use the hook holder mount- ed in the rear side of the crane
body as a means of pulling a vehicle.
This may break the holder.
Hook holder
17 To avoid rubber crawler damage.
()
()
()
Be sure to drive both sides
of crawler in the same
direction for making a turn.
Do not drive both sides of
crawler in the opposite
direction each other.
Do not drive only one
side of the crawler.
★For the white (or gray) crawler, observe the
driving strictly in terms of its characteristics.

2-4
SAFETY PRECAUTIONS ON CARRIER OPERATION
1 Return the crawling lever and run the engine at a low speed.
󱯔After operation
2 Shift the crawling lever to “Crane” posi- tion.
3 Stop the engine and remove dirt and dust stuck on the crane body.
★Since dust stuck on the battery, electric
wiring, and engine related components such
as muffler may cause a fire in particular, be
sure to remove it.
4 Cover the crane or store it in a storage house to prevent it from being accessed
by unrelated persons such as children.
★Cover the crane after heated sections
have been cooled off.
Putting a cover on while the crane body is
still hot may cause a fire.
5 Remove the starter switch key to store.
★Failure to disconnect it may cause a fire
as cables short-circuited by gnawing animals
such as rat.
6 Disconnect a battery cable before the crane is to be stored for a long period of
time.
Cable (-) Disconnect
󱯒When loading and
unloading
1 When loading and unloading the crane, use a non-slip foot-board with a enough
capacity of strength, width, and length
and run the crane straight up and down at
a very low speed.
Changing direction of the crane on the foot-
board may cause the crane to fall off.
2 Stop the engine, apply parking brake, and put drags to wheels to secure the
mounting vehicle when loading and unload-
ing the crane.
★Failure to observe this may cause the
crane to fall off because the vehicle shift
while it is being loaded and unloaded.
★Work by following the instructions illus-
trated in the sticker, “Loading and unloading
procedures”. (Refer to page 6-5.)

3-1
3. SAFETY PRECAUTIONS ON CRANE OPERATION
󱯎Before operation
Pedal Interlock for crane-crwal
operation
Crawling lever
Crane
★When the crane is to be operated close to
the power transmission or distribution line,
contact in advance with a local power com-
pany to make arrangements concerning safety
for starting the crane operation.
★If crane operation close to the power trans-
mission or distribution line is unavoidable, be
sure to secure safety distance from the power
lines.
List of target safety distance
Power transmission line
Voltage Safety distance (target)
500,000 volts 36ft(11.0m) or more
275,000 volts 23ft(7.0m) or more
187,000 volts 20ft(6.0m) or more
154,000 volts 17ft(5.0m) or more
66,000 volts 14ft(4.0m) or more
22,000 volts 10ft(3.0m) or more
Power distribution line
Voltage Safety distance (target)
6,600 volts 7ft(2.0m) or more
2 Make sure crawling levers are locked.
1 Be sure to make inspection before oper- ation and periodical inspection for sling-
ing implements.
★If a defective slinging implement is used,
fall of lifted cargo may result.
3 Turn ON the overwinding alarm switch.
4 Make sure that each safety device is always functioning properly.
★Be sure to turn ON the overwinding alarm
switch before starting crane operation.
★The crane is not electrically insulated.
★When the crane is operated near the power
transmission line or the power distribution
line, there may be a risk of electric shock
due to electric discharge even if a part of the
crane such as boom will not make a direct
contact with the power lines.
5 Keep a safety distance away from the high-voltage power line to avoid an
electric shock.
6 Do not operate the crane when wind velocity exceeds 22mph(10m/sec). and/
or while thundering.
★Crane operation while strong wind is
blowing can cause fall of a lifted cargo or
overturn of the crane as the boom and/or a
lifted cargo are hit by a gust of wind.
7 Pay attention that anyone except per- sons concerned will not enter within a
working radius of the crane.
★Take good care to carry out safety opera-
tion by keeping a close watch around the
working area.

3-2
SAFETY PRECAUTIONS ON CRANE OPERATION
10 Operation with the crane kept leaning makes it unstable when a
cargo is lifted up.
Such operation can cause the crane to be
overturned.
8 Make sure that the ground on which outriggers are to be set up is solid and
firm.
★When setting up the outriggers on an
unleveled ground or on a slope, be sure to
place a support (such as plank, steel plate
etc.) under the outrigger foot flanges to keep
the crane level.
In addition, when the crane is to be operated
on a soft ground, take the same measures to
prevent the outrigger foot flanges from sink-
ing into the ground when a cargo is lifted up.
9 Lift up the crawler by approx. 2in. (50mm)from the ground.
11 In normal crane operation, be sure to set up the crane level with the
outriggers fully extended.
12 Do not stand under or in front of the hook when unhooking as it swings.
13 Do not try adjusting hydraulic equipment.
󱯐During operation
1 Pay attention that the hook will not be overwound.
Be sure to turn ON the “overwinding alarm
switch”.
★Remember that the hook is wound up
when boom is extending.
★If the hook hits against the boom top due
to overwinding of the hook, it may cause
damage to wire rope and the sheaves at the
boom top and may cause the fall of lifted
cargo.
2 Operate each lever slowly and smooth- ly.
★An abrupt lever operation with a cargo
lifted gives an excessive shock to the crane
which may cause damage or overturn to the
crane.
3 Slew the crane at low speed.
★Swing of a lifted cargo increases working
radius of the crane which may cause it to be
overloaded.
4 If the engine speed is too slow when operating the crane, press the accelera-
tor to increase it.
★Crane operation with the engine (and
pump) running at low speed may cause a
cargo hoisted up to swing due to pulsation of
the engine.
This is not a malfunction but impairs smooth
control of the crane.
5 Overloaded operation is strictly prohib- ited.
★Crane operation with a load exceeding the
rated load hoisted may cause damage or over-
turn to the crane.
DANGER
BEFORE OPERATING THE CRANE
IT IS MANDATORY TO
OUTRIGGERS
SET UP ALL THE

3-3
SAFETY PRECAUTIONS ON CRANE OPERATION
6 Pulling a cargo sideways, straight, or obliquely is strictly prohibited.
★These operation may cause slewing mem-
bers, booms, columns, and derrick cylinder to
be damaged.
7 When a cargo to be lifted is detached from the ground, stop lifting it up tem-
porarily to confirm safety.
★When a cargo to be lifted is detached from
the ground, stop lifting it up temporarily to
make sure that the cargo is kept horizon-
tally, the crane maintains its stability, and
the rope slinging up the cargo is positioned
properly.
Then lift it up again after making sure of the
safety.
★For lowering a cargo, stop lowering it
immediately before it touches the ground
then lower it again gradually.
8 Do not leave from operating position with a cargo hoisted.
★Lower a hoisted cargo onto the ground
before leaving from the operation site.
10 Do not stay under a hoisted cargo.
9 Do not get up on a cargo being hoisted.
★This may cause a fall from the cargo being
hoisted.
11 Pay attention that wire ropes will not be paid out unnecessarily to
prevent ropes from being wound around the
drum irregularly.
★Operation such as paying out wire ropes
further with a cargo placed on the ground,
retraction and/or lowering boom loosen the
ropes to cause them irregular winding which
results in remarkable shortening service life
of the ropes.
★Wind the first layer of rope firmly and
regularly around the drum.
★Correct kinks of rope immediately with a
mallet.
12 Pay extra attention to underground crane work in which the hook must
be lowered further than the work on the
ground.
★When paying out wire ropes, be sure that
more than 3 turns of rope must always be left
on the drum.
★Oil temperature is apt to rise easily if
repeated operation of winding up and down
the hook, especially in a high lift, is required.
★Excessive high temperature of hydraulic
oil damages high-pressure hoses and gaskets
being employed to cause the oil to spout out
so that a scald may result.
13 Stop crane operation when tem- perature of hydraulic oil exceeds
176°F(80°C).

3-4
SAFETY PRECAUTIONS ON CRANE OPERATION
󱯒After operation
1 Make sure that the booms, the outrig- gers, and the hook have been stored
before crawling the crane.
★Temperature of both hydraulic and
gear oil is high immediately after crane
operation so that accumulated high pres-
sure still remains.
Removing filling cap, draining oil, or replac-
ing oil filter while temperature is still high
allows hydraulic and/or gear oil to spout out
and a scald may result.
2 Do not carry out maintenance and inspection while temperature of either
hydraulic oil or gear oil is still high.
3 Since temperature on the engine and the hood in the side is too high immediately
after crane work, touch them after they have
been cooled down.

4-1
4. DESCRIPTION OF CARRIER EQUIPMENT
17
19
8
10
6
14 7
9
52143
14
18
15
17
11
12 16
13
20

4-2
DESCRIPTION OF CARRIER EQUIPMENT
13. Fuel meter
This indicates a residual quantity of the fuel.
14. Interlock for crane-crawl operation
This allows the crawling levers to lock while
the crane is being operated and allows the
crane not to be operated by the crane con-
trol levers when it is crawling. This can be
switched by pressing “18 pedal”.
15. Button for selecting crawling speed
This allows the crane to crawl faster while it
is being depressed.
16. Warning lamp
The lamp lights to indicate that something is
wrong with each section.
17. Emergency stop (engine) button
Depression of the switch allows the engine
to stop and all the crane operation including
traveling stop functioning.
18. Pedal
It is used to release crawling levers.
19. Head light
20. Indicator lamp for High altitude
solenoid
The lamp lights when the solenoid operates
at an altitude of 2622 ~ 5500 ft.(800~1676m)
It allows the engine to decrease quantity of
jet.
1. Rubber crawler
Cored bar and steel fabric(cords) are integrally
molded in the rubber which is of the same
quality as automobile tire.
2. Wheel sprocket
It transmits driving power to the rubber crawl-
er to allow the crane to crawl.
3. Idle roller
This is a roller which gives a proper tension to
the rubber crawler.
4. Truck roller
This supports the weight of crane and rolls on
the rubber crawler.
5. Crawling motor
Hydraulic motor with reduction gears which
transmits driving power to the wheel sprocket
is built inside.
6. Crawling lever
This is to change crawling speed and direc-
tion.
7. Accelerator pedal
This is to control engine speed.
8. Driver’s seat
This is a seat on which operator sits to oper-
ate the crane.
9. Fuel tank
This is filled with diesel oil.
10. Hydraulic oil tank
This is filled with hydraulic oil which is com-
monly supplied both to the carrier and to the
crane.
11. Starter switch
This is a switch to start and stop the engine.
12. Hour meter
This indicates total engine running time.

5-1
5. DESCRIPTION OF CRANE EQUIPMENT
2
19
3
45
619 7
19
10
8
11
18 22 24
23
17
2516
20
21
12
1314
15

5-2
DESCRIPTION OF CRANE EQUIPMENT
1. Boom
It extends and retracts by hydraulic cylinder
and the hook is suspended from its top.
2. Column
This is a vertically mounted member on the
crane in which boom, winch, and derrick cyl-
inders are installed.
The column can be turned by slewing device.
12. Overwinding alarm
When the hook comes close to the boom top,
this makes an alarm to warn that wire ropes
are to be overwound.
3. Frame
This is fixed on the vehicle to support the col-
umn and outriggers.
4. Hoist winch
This is a device which rotates the wire drum
by hydraulic motor to hoist up and down a
cargo via wire ropes.
5. Slewing device
This turns the column by hydraulic motor.
6. Derrick cylinder
This raises and lower the boom.
7. Telescoping cylinder
This extends and retracts sections of boom.
8. Outrigger
This supports the crane to maintain its stabil-
ity while it is operated.
9. Crane operating levers
Respective levers control raising and lower-
ing boom, hoisting a cargo up and down, tele-
scoping boom, and slewing boom.
10. Outrigger operating levers
This lever controls outriggers.
The outrigger control levers selects each
movement of extension and retraction.
11. Hook
13. Wire rope
16. Level
This an instrument for checking horizontal
plane of the crane body.
17. Alarm switch
This switches ON and OFF the overwinding
alarm.
18. Operation mode switch
This selects crane operation mode and outrig-
ger operation mode.
14. Boom angle chart
This can read the working radius value corre-
sponding to extended length of the boom and
its raised angle.
15. Automatic stop for leaving mini-
mum wire rope (With wire rope
retaining roller)
This is a devise to restrict slackening of
wire rope on the drum which allows to stop
unwinding automatically when remaining
wire ropes on the drum come close to 3 turns.
19. Turn over prevention device
This detects load against ground from outrig-
gers.
21. Emergency stop (engine) switch
Depression of the switch allows the engine
to stop and all the crane operation including
traveling stop functioning.
20. Horn switch
Depression of the switch allows the alarm
horn to sound.