Nokka-Tume 4670 Application guide

4670, 4675
LOADER
Installation, operation and maintenance
manual, Spare parts list
NOKKA-TUME OY
Forest Division Forest Division
PL 4, 40951 Muurame FIN-40950 Muurame, Finland
Puhelin [phone] Tel. [phone]
Telefax [phone] Fax [phone]

CONTENTS Page
Foreword.....................................................................................................1
Declaration of compliance with EC directives.............................................1
1. Before use ........................................................................................2 - 4
Measurement units...............................................................................2
Directions..............................................................................................2
Serial number.......................................................................................2
Safety instructions...........................................................................2 - 3
Noise reduction.....................................................................................3
Minimum distances from live electric conductors.................................4
Driving on a road..................................................................................4
Inspections during use..........................................................................4
Structural changes................................................................................4
2. Operating the machine.....................................................................5 - 10
Properties of the machine in brief.........................................................5
Technical specifications........................................................................5
Maximum lifting table............................................................................6
Prepearing for use................................................................................7
Inspection of assembly.........................................................................8
Transport position.................................................................................9
Working instructions......................................................................9 - 10
3. Maintenance ..................................................................................10 - 14
Safety in maintenance work ...............................................................10
General maintenance instructions......................................................10
Lubrication..........................................................................................11
Oil lever control of the turning device.................................................11
Adjusting the support bearing of gear rack.........................................11
Powerless loader motions ..................................................................11
Hydraulics...........................................................................................12
Changing hydraulic hose....................................................................12
Adjustment of valves for hydraulic extension (4675)..........................12
Serial number.....................................................................................12
Storage...............................................................................................12
Disposal of the machine.....................................................................12
Loading table......................................................................................13
How to order spare parts....................................................................13
Warranty policy...................................................................................14
Examples of calculating for stability determination......................15 - 21
Spare parts catalog.......................................................................22 - 69

TO THE OWNER OF THE NOKKA LOADER
Congratulations on a good choice of a machine. If you follow the instructions of this booklet,
the loader will serve you long and free of trouble. Familiarize yourself with this booklet
before you start working with the loader. If there are any problems, please contact your
dealer or the manufacturer.
Yours faithfully
Nokka-Tume Oy
DECLARATION OF COMPLIANCE WITH EC DIRECTIVES
Nokka-Tume Oy
P.O.Box 4
40951 Muurame
FINLAND
declares that the loader NOKKA 4670 and NOKKA 4675, which has been released on the
market, is in accordance with machine directive 89/392/ETY and the associated
amendments 93/44/ETY, 93/68/ETY and 98/37/EY.
This declaration applies to machines starting from serial number:
HK 4670 no. 100
HK 4675 no. 100
Muurame 01.07.2003
____________________________
Harri Huttunen
Factory manager
1

1. BEFORE USE
MEASUREMENT UNITS
The Installation and Operating Manual, measurement units according to the international SI
measurement system are used.
DIRECTIONS
In this Installation and Operating Manual, right and left side and front and rear end of the
machine are to be understood in reference to the driving direction.
SERIAL NUMBER
Write down the serial number of your machine in the space reserved for it on page 13 of the
booklet. Be prepared to give the type and serial number of your machine in all enquiries
and orders relating to the machine.
SAFETY INSTRUCTIONS
NOTE!
The safety instructions in the booklet are marked with this sign. Read these instructions
with particular care.
1. Familiarize yourself with the operation manual and read carefully the safety instructions
and all the labels on the machine. If the machine is to be used by another person, make
sure that the user reads the operating and safety instructions before you hand over the
machine.
2. The operator must be a person at least 18 years old and in good health.
3. The operator must not be under the influence of inebriating or intoxicating substances
or medicaments.
4. Remove all loose parts from the machine which no not belong there.
5. Fit the protective guards in place.
6. Get acquainted with all controls and instruments.
7. When the loader is to be serviced, cleaned or adjusted or when accessories are to be
mounted on it, place the booms of the loader in a suitable place and secure it so that it
cannot move.
8. Do not make any structural alterations in the loader that could compromise its safety. It
is forbidden to weld booms.
9. Do not use the machine for purposes for which it is not intended to be used.
2

10. Dangerous area covers 20 metres, in falling head use 50 metres. Take notice of the
dangerous area also when using accessories, take care that there is nobody staying in
the dangerous area, observe especially children.
11. Never leave the loader (with or without a load) so that the booms are hanging in the air
if the loader is not watched over by yourself.
12. Do not use loose or torn clothes.
13. Never go under the booms or load. Operate the loader only from the cab of the tractor.
14. Observe safety distances from live electric conductors when using the machine.
15. After the first hour of operation, check all screws and nuts for tightness. Perform this
check from time to time even later.
16. Inspect the hydraulic system to detect any leakages during operation, repair any faults
immediately. Do not let oil leak out and pollute the environment.
17. When mounting the valve block you have to notice that it is not allowed for pressurized
hydraulic hoses to be located in the cab without any protection.
18. Use only original spare parts.
19. The controls of the loader have to be placed into the cab, which fulfils the requirements.
20. It is forbidden to loose support legs from the transport package before the loader is
fitted to the lower arms of the tractor, the loader looses the stability.
21. Allways use support legs while using the loader.
22. Before starting to work be sure that the combination is stable against tipping. At the end
of this booklet, a calculation instruction for stability determination exists.
23. Use only original accessories.
NOISE REDUCTION
Continual noise may cause hearing problems and even a loss of hearing. The noise level
on the working place depends on noise isolation and way of mounting valves. Use suitable
ear protectors or ear plugs that have a sufficient noise damping capacity.
When servicing the hydraulic system, use gloves to protect your skin against oil.
3

MINIMUM DISTANCES FROM LIVE ELECTRIC CONDUCTORS
DRIVING ON A ROAD
• On public roads, keep equipment required by traffic rules mounted and the lights turned
on. Also keep the tractor's safety triangle in place.
• Keep the reflectors and lamps clean.
• Remember that the weight of the loader makes the tractor less steerable.
INSPECTIONS DURING USE
To ensure trouble free operation periodic inspections must be carried out. After the first
hour of use inspect all hoses, fittings and rams for oil leaks. Carry out further checks at
regular intervals.
STRUCTURAL CHANGES
Do not make any structural changes in the machine without the manufacturer's consent to
avoid reducing its working capacity or safety or shortening its useful life.
Nominal Minimum distance Minimum distance
voltage from an uninsulated from an insulated
kV conductor, m conductor, m
<0,5 2 0,5
0,5 - 45 3 1,5
>110 5
4

2. OPERATING THE MACHINE
PROPERTIES OF THE MACHINE IN BRIEF
NOKKA 4670and NOKKA 4675loader is designed for wood loading in half time
professional use and in forestry work of a farm. The loader is not designed for liftings where
co-operators work near to the load to be lifted. Use of the machine for any other purpose
without the manufacturer's permission is forbidden and entails invalidation of the
guarantee.
TECHNICAL SPECIFICATIONS
4670
Weight of the loader ready for work with log grab............................1070 kg
Net lifting torque.............................................................................36.2 kNm
Gross lifting torque............................................................................46 kNm
Swing torque..................................................................................12.6 kNm
Boom turning angle............................................................................... 400o
Maximum reach with two extension.....................................................6.9 m
Lenght of extension..............................................................................1,6 m
Maximum working pressure...........................................................17.5 MPa
Recommended hydraulic pump capacity ........................................ 50 l/min
4675
Weight of the loader ready for work with log grab............................1130 kg
Net lifting torque.............................................................................32.1 kNm
Gross lifting torque............................................................................46 kNm
Swing torque..................................................................................12.6 kNm
Boom turning angle............................................................................... 400o
Maximum reach with two extension.....................................................7.5 m
Lenght of extensions....................................................................2 x 1.25 m
Maximum working pressure...........................................................17.5 MPa
Recommended hydraulic pump capacity ........................................ 50 l/min
5

MAXIMUM LIFTING TABLE
Maximum lifting capacity of 4670 and 4675 loaders without the rotator and the log grab.
Lifting capacities are measured in different boom positions . Lifting capacity with the rotator
and the log grab is approximately 130 kg lower.
6

PREPEARING FOR USE
The loader will be supplied to retail dealer and further to the customer on a
transport stand or mounted on the loader mounting pad of the forest trailer.
Unpacking from the stand and preparing the loader for work is done in the following
way:
24. Lift the loader onto a flat base. Lift the loader a little bit up with a lifter, with
which the loader can be handled securely and cut the fastenings. Do not go
under the loader, and be careful against swinging and falling of the loader.
25. Lift the loader either on the loader mounting pad or on the four point frame
mounted on the tractor frame, and fasten the loader with bolts and nuts (M24).
If the loader is installed on the loader mounting pad having an oil tank, oil resist-
ant silicon will be put between the flanges to avoid leakings. Don´t allow silicon
to run into the oil tank. If the loader is fastened with the forest trailer and also
the telescopic support legs are mounted, the upper fastener of the support legs
must be mounted under the fastening bolts of the loader on the back side of the
loader at the same time. Tightening moment is 660 +/- 70 Nm.
26. Mount the valve block with the tractor so that the control levers move without
any hindrance and the valves can be easily controlled. Fasten the valve block
enough firm in order to avoid movement and falling. It is not allowed to have
unprotected pressurised hydraulic pipes in the control cabin.
27. Connect the return and pressure hoses of the loader to the tractor hydraulic
outputs. The return hose is located in the left end, seen from the hoses, and the
pressure hose is in the right end. The return hose is equipped with a female
connector, the pressure hose has a male connector. It is good to connect the
return hose directly into the tank, so there will not grow any pressure in the
return pipe line. Follow the connection instruction of the tractor manufacturer,
however.
28. If support legs is mounted mount them as next ones. Fasten the hydraulic
hoses of the support legs.
29. Loosen the transport support in the transfer boom.
30. Make sure that the levers of the valve move freely in the centre positions. Turn
on the hydraulic supply.
31. Bend the boom jib with a movement of the transfer boom so that the boom jib is
completely bent. The grab has been fastened with the lifting boom, loosen the
grab from the boom very carefully because the grab can slip down during the
loosening (risk for accident). Lower the grab by using movements of the boom
jib. Be careful with the swinging movement of the grab when the grab is
lowering downwards, the grab or the hoses of the grab rotator can get broken
or the grab can break something when swinging.
32. Put the front gate of the trailer in its position.
33. Move all the movements of the loader some times back and forth from the end
position to the other, possible air in the system disappears. Be careful when
moving the loader because the movements can be fast if there exists air in the
system.
34. When you have moved the loader, check tightening of the tightening bolts.
Tightening of the bolts must be checked during the operation sometimes, as
well, tighten if needed.
7

3. INSPECTION OF ASSEMBLY
Test loading has been done in the factory and it has been registered into log sheet.
Equipment:
• Check that all the pins, locking pins and other parts important for safety are secured in
place and that the threaded joints are tight.
Operation of the control valve:
• Check that the control valve operation matches the diagram and the control levers return
to centre position (except from the extreme 'float' position).
Operation of the safety relief valve:
• Check that the relief valves are working by listening.
• A pressure test can be done from the pressure hose quick connector. Maximum allowed
pressure settings are mentioned in the specifications.
Hydraulic equipment:
• Inspect the condition of the hoses and couplings and make sure that the hoses cannot be
rubbed or twisted.
Labels:
Check that the machine has:
• a manufacturing label
• load label/high voltage wire label
• a control valve lever operation diagram
• a dangerous area label
Stability:
• Check that the loader/forestry trailer combination is stable enough against overturning.
• The stability must be determined either by calculating using the formula in the loader
manual or experimentally according to standard SFS 4677.
Stability determination in practice:
• A loader is considered safe if during the test no more than one support point is off the
ground.
Testing requirements:
• The vehicle is tilted 5oin the direction of tipping. During the test the vehicle is in normal
operating condition without load.
Test:
• The test is performed in the most unstable direction using 10% overload. During the test
all normal movements must be performed although with extra caution.
8

TRANSPORT POSITION
When a loader is mounted on frame parts of a tractor, during transports, the centre of
gravity of the loader should be as close to the tractor as possible. For transport the best
position is with the loader facing forward with the grab at the front of the tractor.
If a loader is transported in the rearward position the extra weight at the rear may adversely
affect the tractor steering.
If the forestry trailer is towed by a tractor and the loader is attached to the tractors frame
part, the loader grab can be attached to the frame of the forestry trailer. In that case the
loader valves must have a floating position for the lift boom, shift beam and turning
movements by setting the levers beyond the normal work position into the float
positions.Loader equipped with hydraulic precontrol have floating position by setting the
electrical switch to the float position. Before coupling to the floating position, the grab of the
loader has to be attached to the trailer frame, otherwise the loader boom comes rapidly
down. When transporting watch out that the grab is tightly attached to the trailer frame.
If the loader is fitted on the forestry trailer beam, the loader grab is placed on the trailer
frame or on top of the load.
During transport, beware of the danger resulting from the height of the loader, electrical
cables, etc.
WORKING INSTRUCTIONS
35. Keep a parking brake on when using the loader.
36. Make sure there are no people in the working area.
37. Take care that you can see the whole working area without difficulty.
38. Start working the loader with low engine revs to keep the movements of the loader
slow. You can increase the speed as you get acquainted with the machine.
39. Avoid quick, sharp movements: your aim should be to get a smooth operation of the
loader. Start a new operation while the other operation is still going.
40. In the cold season, before you start working, make sure the levers work well. Check
that the levers return to the center positions as you let them free. If the levers move
stiffly, let the oil circulate in the system to warm it up.
41. Do not use the loader for towing, or pulling sideways.
42. Be especially careful when working near electric conductors. Remember the safety
distances from electric conductors.
43. Lifting people with the loader is prohibited.
44. Get acquainted with the loader by lifting light loads first. Note! Never leave the loader up
(with the load or without) in the air, unless you stay and quard the loader yourself.
9

45. If the combination (tractor/loader or forestry trailer/loader) starts to overturn, lower the
load down immediately. Do not drop the load off the grab. Keep hold of the steering
wheel, do not jump off the tractor!
46. Avoid loading on a slope. Do not lift full loads from the uphill side; the boom may not
stop swinging because the pressure in the ram may rise too much and open the relief
valve, which causes oil to escape from the ram and it will not stop. In an overloading
condition there is always risk of overturning.
47. If the cross link of the loader, in its extreme position, rests on the back stop of the
transfer boom, the position of the boom has be changed so that the cross link comes
loose from the back stop. If a load is lifted with the loader or the grab is pressed with
the boom e.g. against the load when the cross link rests on back stop, the shaft of the
rotator can be damaged. The guarantee does not remunerate damages caused by
incorrect use.
3. MAINTENANCE
SAFETY IN MAINTENANCE WORK
Before carrying out any servicing, adjustment or cleaning work or mounting any
accessories:
• Disengage the hydraulic power output.
• Fully lower the equipment.
• Stop the engine.
• WAIT until all parts have come to a standstill.
• Before starting servicing support all booms properly to prevent the loader from moving
even if the valve levers are touched.
• If the hydraulic system needs to be used in servicung or installation, observe special care
in the hydraulic motions.
GENERAL MAINTENACE INSTRUCTIONS
Servicing the loader carefully and at appropriate times ensures proper operation and
durability of your machine.
• In all maintenance work, observe an absolute cleanliness.
• Keep an eye on the cylinders, hoses and couplings and repair any leaks immediately.
• If a fault appears, try to locate it as accurately as possible. This will help you avoid
unnecessary work and further damage.
• Always use authentic spare parts.
10

LUBRICATION
Lubricate the loader after 16 hours of operational.
Apply grease until it slightly runs over from the part being greased.
In order to make the lubricatin work of the grease nipples in the upper end of the vertical
boom easier worktops has been installed above the turning cylinders. Before going up put
the boom directly backwards and attach it at the frame of the forestry trailer or put it on the
ground. Extensions booms can be greased by spreading grease on the booms slide
surfaces. Use only high quality grease, example NESTE OH GREASE.
OIL LEVER CONTROL OF THE TURNING DEVICE
In the loader turning device is oil for the lubrication of the lower bearing and gear rack. Oil
level must check at times. Oil level is controlled by turning full/check screw open, oil level
must be at the same level as the full/check screw hole. Increase oil if needed, oil quality is
80 W90. Upper bearing must be gresed by grease.
ADJUSTING THE SUPPORT BEARING OF THE GEAR RACK
Checking the tightness of the support bearings of the gear rack and the vertical boom's
tooth rim is essential to prevent breaking of the teeth. Check the adjustment after first 10
hours of operation and after it at intervals of about 100 hours. The recommended clearance
is 0.05 - 0.1 mm, which corresponds to a 10o- 20oturn of the tightening screw. First loosen
the lock nut and then tighten the tightening screw (torque 10 kPm). After this open the
screw about 10o- 20o. Finally screw the lock nut back and tighten it. It is useful to check at
times that the nut and screw have not turned loose by themselves.
POWERLESS LOADER MOTIONS
If the lifting power of the loader does not correspond to the values specified for it, check the
following points:
• Measure the tractor take-out pressure: it should be over 175 bar.
• Measure the pressure of the hydraulic return line; max. 5 bar, preferably under 2 bar. If
the pressure exceeds the maximum, arrange a free return line in the tractor. However,
observe the tractor manufacturer's instructions in connecting the return line.
• If the tractor take-out pressure is over 175 bar and the return line pressure is under the
maximum, check the loader's pressure limiting valves. Adjusting the loader's valves must
be entrusted to an authorized repair shop because the manufacturer's guarantee will no
longer be valid if the valves are adjusted improperly.
11

HYDRAULICS
Hydraulic hoses, pipes and couplings should be checked at times to find possible fractures
or leaks. Replace worn or broken parts with new ones to avoid damage. The return hose
type is 1/2" SAE 100 R1AT, and the pressure hose type is 3/8" SAE 100 R2AT. Always
observe maximum cleaness while servicing hydraulic components, and clean the inside of
hoses from dust, rubber particles, etc., before installation.
CHANGING HYDRAULIC HOSES
Proper installation prolongs the life of hydraulic hoses considerably. Observe the following
instructions while changing hydraulic hoses.
• Clean the hoses from dirt, both inside and outside.
• Check that the hose goes along the proper route, and after installation check that the hose
is able to move freely in all hydraulic motions.
• Check that the hose is not twisted. A twisted hose has a much shorter life than a properly
installed straight one.
After installation check that the hose couplings do not leak.
SERIAL NUMBER
Write down the serial number of your farm loader in the space provided below. You will find
the serial number on the label placed on the left-hand side of the vertical boom.
Serial number __________________________
STORAGE
If the forestry trailer is not in use, it's working condition and resale value can be maintained
by proper storage. Clean the machine and repaint any worn or rusty spots carefully before
putting it into storage. Lubricate all greasing points and apply a thin layer of lubricant on
places which cannot be painted or greased.
The place for storage should be a dry and cool space.
Before cleaning, disengage the hydraulic drive and stop the tractor engine. If a loader is
mounted on the forestry trailer, set the boom so that it cannot sink during storage.
DISPOSAL OF THE MACHINE
Be careful when dismantling the machine.
Make sure the dismounted machine parts and the oil are taken to appropriate collection
spots.
12

LOADING TABLE
The loading table values for the working pressure of 17,5 MPa.
The values are not maximum lifting values, but maximum allowable loads for the loader.
HOW TO ORDER SPARE PARTS
When ordering spare parts, always give the following information:
• Designation of the machine
• Serial number of the machine
• Spare part number
• Designation of the spare part
• Your name and address
• Method of delivery
Do not order only by the picture, compare the part to its designation. Order the parts in
good time from your dealer. If you have lost your spare parts catalogue, send the broken or
worn-out part as a sample.
Example.
LOADER NOKKA 4670
4670 XXXX (serial number)
1 pc 0170090 bearing bush 45/50-40 WB 681
Name___________________________________________
Address_________________________________________
Method of delivery__________________________________
13

WARRANTY POLICY
(Nokka Machines Division)
Nokka-Tume Oy (the manufacturer) grants its products a warranty for the period of 6
months from the delivery date of the machine to the customer. However, the warranty is
applicable in compliance with the policy only to claims submitted to the manufacturer within
3 years of the delivery date of the product to the representative of the factory or retailer.
The warranty applies to shown defects in manufacturing, raw material, and materials. The
warranty covers replacement of a damaged part to which the warranty applies, but does not
cover any additional damage caused by it to other than the machine itself, nor does the
warranty cover any indirect damage or loss. Such indirect damage or loss can consist of
costs incurred from interruption of work or transport, rental fees of replacement machinery,
etc.
The parts covered by warranty will be delivered, at the expense of the purchaser, to the
country to which the machine was originally delivered. The warranty covers neither the
costs incurred from import, nor the internal cargo costs thereafter.
In unclear cases, the warrantor is entitled to request that the part, for which a claim has
been submitted for repair, be returned to the factory for warranty proceedings with addi-
tional information enclosed as requested by the manufacturer. In such cases the
manufacturer is liable for the return freight.
The warranty does not cover defects caused by normal wear and tear, negligence, intent,
incorrect installation or use, overload, or defective service. The warranty is not applicable to
parts subject to wear and tear such as tyres, hoses, couplings, filters, power cables and
seals. Nor does the warranty cover damage caused to the machine by fire, traffic incident,
or other accident.
A condition of the warranty is a certificate of delivery and warranty completed at the time of
delivery. Additionally, in order to avoid any further damage, a written notice must be
submitted to either the manufacturer or its representative without delay and always prior to
the end of the warranty period. A precondition for applicability of the warranty is also that
the parts used in other repairs performed on the machine are original or approved in
advance by the manufacturer in writing.
The following information must be enclosed with the warranty claim: type of machine,
vehicle identification number, delivery date, name and address of purchaser.
The warranty is not applicable if the original machine or its purpose of use has been
altered, or if any optional equipment has been attached to it without written permission from
the manufacturer.
The warranty becomes void if the machine is transferred from one owner to another during
the warranty period.
14

EXAMPLES OF CALCULATING FOR STABILITY DETERMINATION
In this example:
Loader:29
Tractor:Valmet 605
Find out corresponding measures and weights of you own tractor; use them in the calcu-
lations.
TRACTOR INFORMATION VALMET 605 OWN TRACTOR
Wheel base Cl 236 cm cm cm
Distance from the rear axle to the swing
centre point b 85 cm cm cm
Rear axle weight M2 2050 kg kg kg
Front axle weight M1 1240 kg kg kg
Distance from the rear axle centre
to the tipping edge C 80 cm cm cm
Distance from the loader swing centre
to the tipping edge A 108 cm cm cm
LOADER INFORMATIONHK4670 HK4675 HK3253 HK3266 HK3955HK3966HK3970
Maximum load G518 kg416 kg530 kg400 kg640kg480kg440kg
Weight of thebooms P465 kg510 kg180 kg250 kg270kg320kg360kg
Loader weightwithouttheboomsN485 kg485 kg450 kg450 kg470kg475kg475kg
Distance from the swing centre
to the gravity point of the boomsL1 290 cm 325 cm 225 cm 280 cm 230 cm 280 cm 290 cm
Total lenght of the booms L 690 cm 750 cm 530 cm 660 cm 555 cm 660 cm 700 cm
Use the table above to select the values of your loader for the calculation
15

STABILITY DETERMINATION OF THE TRACTOR WITH THE LOADER FITTED TO
THE THREE POINT LINKAGE
WHEN LIFTED FROM THE SIDE
Stability coefficient:
Required extra weight to the centre of the front axle:
Where:
n Stability coefficient n > 1,0 or n = 1,0
A Right angle distance from the loader swing centre to the tipping edge
B Right angle distance from the end of the boom (from the loader) to the tipping edge
C Right angle to the distance from the vehicle rear axle centre to the tipping edge
E Right angle distance from the loader boom centre of gravity to the tipping edge
G Maximum load at the distance A+B
N Loader weight without the booms
P The weight of the booms
M2Rear axle weight without load
M3Required extra weight to the centre of the rear axle
Line X -X is a tipping edge, it runs through the centre of the front axle and through the centre of the rear
wheel.
Note! If the stability coefficient n becomes smaller than 1.0 in the calculation, extra weights must be used to
get enough stability. Extra weight can be determined by calculation the value for M3.
nNAM
2C×+×
GBPE×+×
---------------------------------------=
M3nGBPE)NAM
2C×–×–×+×(×
C
----------------------------------------------------------------------------------------------=
16

SIDE STABILITY, CALCULATION EXAMPLE
If n is less than 1.0, extra weight M3is calculated by the followung formula:
Note! Required extra weights can be divited in equal amounts between both rear wheels.
EL1(A)cm 226 108)cm–(=–=
E……)cm ……cm=–(=
BL(A)cm 510(108)cm 402cm=–=–=
B……)cm ……cm=–(=
n
NAM
2
C
×
+
×
GBPE
×
+
×
------------------------------------
---
=
n480 108 2050 80×+×
505 402 170 118×+×
-------------------------------------------------------097,==
n…………×
+
×
…………×
+
×
-------------------------------------------……==
M
3nGBPE)NAM
3C×–×–×+×(×
C
---------------------------------------------------------------------------------------------
-
=
M3………×( ……)…………×–×–×+×…
------------------------------------------------------------------------------------------------------------- ……==
17

LIFTING FROM THE REAR WITHOUT SUPPORT LEGS
Stability coefficient:
The required extra weight to the centre of the front axle:
Where:
n Stability coefficient n > 1,0 tai n = 1,0
A Right angle distance from the loader swing centre to the centre of the rear axle
B Right angle distance from the hanging point of the load to the centre of the rear axle
C1 Wheel track
E Right angle distance from the loader boom centre of the gravity to the centre of the rear axle
G Maximum load at the distance of B - A
N Loader weight without the booms
P The weight of the booms
M1Front axle weight without load
M3Required extra weight to the centre of the front axle
nM1C1×
PEGBNA×+×+×
-------------------------------------------------------=
M
3nPEGBNA)M1C1
×–×+×+×(×
C
1
-------------------------------------------------------------------------------------------------=
18