PDF Service Manual Wacker Neuson 750 and 850 Wheel Loaders - 3 MB
This comprehensive service manual covers the Wacker Neuson 750 and 850 wheel loaders.
It is the ultimate guide for technicians, containing detailed information for repair, maintenance, and troubleshooting.
The manual includes specifications, step-by-step procedures, and schematics for all major systems.
Keep your wheel loaders performing at their best by using this in-depth factory service information.
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Service Manual
Wheel loaders
/
Machine model 346-03/346-04
Starting serial no. 346 03 0001/346 04 0001
Edition 2.0
Order number 1000183988
Language EN
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Cab overview, labels,
options
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Cab overview, labels, options
Machine inspections
When operating the machines, the national safety regulations must be followed as well, for
instance in Germany, the regulations for accident prevention “Deutsche Prüfstelle für
Land- und Forsttechnik” (DPLF German inspection and certification body for agriculture
and forestry) and the accident prevention regulation
“Fahrzeuge (vehicles)” (BGV D29 § 57 clause 1).
In Germany, legislation requires all machine operators to have all machines and equip-
ment inspected regularly.
Inspections must be carried out as required, but at least once a year, by an expert and
must be documented in written form. Subsequent inspections of detected defects must be
carried out, too.
A The competent inspection authority may require the inspection report to be available at the
place where the machine is used.
☞ Fasten inspection tag A for evidence
Fig. 1: Inspection tag Bear in mind that all work equipment is inspected, i.e. not only the machine but also all
technical auxiliary means, tools and attachments. (Work equipment is defined as all tools,
attachments, machines or systems.)
This requirement is met, for instance, if the results are documented in a test logbook, a test
log file or in a test report; see also policy of German employers' liability insurance associa-
tion for construction engineering “Inspection of vehicles by experts” (BGG 916)
Get informed on and follow the legal regulations of your country.
Documents
German traffic regulations require to have the following documentation on board, e.g.:
• General Certification for Vehicles (Germany) or data confirmation (Germany)
• Driving licence
• Test report according to BGV D29 § 57 clause 2 (safety and health regulations of
German employer's liability insurance association)
• Operator's Manual
Get informed on and follow the legal regulations of your country.
Machine warning identification (option)
From 01.10.1998 onwards, § 52 clause 4.1 of StVZO German road traffic regulations
require wheel loaders that are used on public roads for the construction and maintenance
of roads, and for the cleaning of roads or facilities, to be fitted with the red and white warn-
ing identification as per DIN 30 710 in connection with a yellow rotating beacon (option).
Get informed on and follow the legal regulations of your country.
Serv-HB 34603_04 EN – Edition 2.0 * 34603_04s110.fm 1-10
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Cab overview, labels, options
Disabling the drive interlock
☞ Enter the personal code or main code (6 digits).
☞ Press the (*) key.
➥ Confirmation: 2 long acoustic signals and long LED flashing
➥ LED OFF = drive interlock is disabled
➥ Diesel engine can be started
The diesel engine will not start if a wrong code has been entered
➥ Confirmation: 4 short acoustic signals, flashing LED = wrong code
➥ Re-enter the code
☞ Turn the ignition key and switch on the engine before the LED flashes again
(30 seconds)
Caution!
The keypad is blocked for 5 minutes and no codes can be entered if the wrong
code is entered four times consecutively.
☞ Enter the code after 5 minutes
• The keypad does not come on as long as it is blocked. It comes on briefly
every 4 seconds and an acoustic signal sounds
☞ Press the (*) key after every code
☞ The LED comes on briefly when turning the ignition key to the engine start
position
Serv-HB 34603_04 EN – Edition 2.0 * 34603_04s110.fm 1-20
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Cab overview, labels, options
1.26 Towing the machine
Safety instructions for towing away
If the diesel engine and/or the hydraulic drive breaks down, the machine can be towed
under the following conditions.
• The towing vehicle must have enough tractive power and be fitted with a safe
brake system!
• The machine may only be towed using suitable towing equipment (towing bar) in
connection with suitable towing facilities, such as a towing coupling, hooks and eyes!
• Make sure no-one is between the vehicles!
• The machine may be towed with a cable if the service brakes and steering are fully
operational!
Getting ready for towing
Disabling the variable displacement drive pump
C B
A
Caution!
The hydrostatic power train can be damaged when towing the machine!
☞ Tow away the machine from the danger area only after you have opened
the HP pressure relief valves
☞ Tow the machine out of the danger area only at walking pace and only
A over short distances
B
☞ Switch off the diesel engine
C
☞ Switch off ignition and remove the ignition key
Variable displacement drive pump (20 kph)
Fig. 33: 20 kph hydraulic pump ☞ Switch over the HP pressure relief valves A on the variable displacement pump.
To do this:
• Slacken hexagon lock nuts B on both HP valves A
• Screw in hexagon socket head screws C on both HP valves A until they are flush with
D F lock nuts B
• Secure hexagon socket head screws C on both HP valves A with lock nuts B
Variable displacement drive pump 30 kph (option)
☞ Mount hose D between test ports E and F
➥ The hose is included in the tool kit
E
☞ If possible, run the diesel engine at idling speed when towing the machine
Fig. 34: 30 kph hydraulic pump (option)
Serv-HB 34603_04 EN – Edition 2.0 * 34603_04s110.fm 1-30
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Specifications
2.12 Noise levels
Sound power level, wheel loader models 346-03/346-04 dB(A)
Measured value 99.8
Guaranteed value 101
Noise level in the cab 78
Important!
Measurement of sound power level according to
EC Directive 2000/14 EC. Noise level at the driver's ear measured according to
EC Directives 84/532/EEC, 89/514/EEC and 95/27/EEC.
Measurements carried out on asphalted surface.
2.13 Vibration
Vibration
Effective acceleration value for the m
< 2.5 -----
-
upper extremities of the body s2
Effective acceleration value for m
< 0.5 -----
-
the body s2
2.14 Coolant compound table
Outside temperature Water 1 Antifreeze
Up to °C % by volume % by volume
4 99 –
- 10 79 20
- 20 65 34
- 25 59 40
- 35 55 45
- 42 50 50
1. Water quality at 20 °C = 6.5 – 8.5 ph/overall hardness 3 – 20 °dGH
Serv-HB 34603_04 EN – Edition 2.0 * 34603_04s210.fm 2-8
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Maintenance and service work
3.2 Maintenance label
Location: inside the cab on the rear window
100 010 40 14
Täglich
10 h Daily
Tous les jours
50 h
342 00 343 01 346 03 347 02
342 01 346 01 346 04 347 03
343 00 346 02 347 01 347 04
Serv-HB 34603_04 EN – Edition 2.0 * 34603_04s310.fm 3-2
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Maintenance and service work
3.9 Bleeding the fuel system
Danger!
If the fuel, as it drains, comes into contact with hot engine parts or the exhaust
system, there is an increased
Danger of burns!
A ☞ Never bleed the fuel system if the engine is hot!
Environment!
Use a suitable container to collect the fuel as it drains and dispose of it in an
environmentally friendly manner!
Bleed the fuel system in the following cases:
• After removing and fitting the fuel filter, prefilter or the fuel lines back on again
• After running the fuel tank empty
B • After running the engine again, after it has been out of service for a longer period of
time
☞ Bleed the fuel system as follows:
Fig. 47: Bleeding the fuel system • Place the container under the engine
• Fill the fuel tank
• Slacken bleed screw A on the injection pump by a few turns
• Press button B on the fuel pump with your hand (pumping movement) until the fuel
comes out free of air from the slackened bleed screw
• Tighten bleed screw A
• Start the engine
If the engine runs smoothly for a while, and then stops; or if it does not run smoothly:
• Stop the engine
• Check once again if there is any air in the fuel system
• Bleed the fuel system again as described above
Serv-HB 34603_04 EN – Edition 2.0 * 34603_04s320.fm 3-12
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Maintenance and service work
3.19 Monitoring the hydraulic oil reflux filter
On the instrument panel, the red telltale 39 monitors reflux pressure and the reflux filter,
40
and telltale 40 monitors oil temperature.
39 ☞ If telltale 39 comes on
➥ the reflux pressure in the filter is too high or
1
☞ If telltale 40 comes on
➥ the hydraulic oil temperature is too high
☞ At the latest after 1500 service hours (once a year)
Telltale 39 on the instrument panel can come on in cold weather immediately after starting
the engine. This is caused by increased oil viscosity. In this case:
☞ Set engine speed so that telltale 39 on the instrument panel goes out
Fig. 60: Preheating start switch
☞ Bear in mind the instructions concerning warmup
Important information for the use of biodegradable oil
• Use only the biodegradable hydraulic fluids which have been tested and approved by
Kramer-Werke GmbH Fluids and lubricants on page 3-3. Always contact Kramer-
Werke GmbH for the use of other products which have not been recommended. In
addition, ask the oil supplier for a written declaration of guarantee. This guarantee is
applicable to damage occurring on the hydraulic components, which can be proved to
be due to the hydraulic fluid
• Use only biodegradable oil of the same type for filling up. In order to avoid misunder-
standings, a label providing clear information is located on the hydraulic oil tank (next to
the filler inlet) regarding the type of oil currently used! Replace missing labels!
The joint use of two different biodegradable oils can affect the quality of one of the oil
types. Therefore, make sure the remaining amount of initial hydraulic fluid in the
hydraulic system does not exceed 8 % when changing biodegradable oil
(manufacturer indications)
• Do not fill up with mineral oil – the content of mineral oil should not exceed 2 % in order
to avoid foaming problems and to ensure biological degradability
• When running the machine with biodegradable oil, the same oil and filter replacement
intervals are valid as for mineral oil – see maintenance plans in the appendix
• Have the condensation water in the hydraulic oil tank drained by an authorised
workshop every 500 service hours, in any case before the cold season. The water
content must not exceed 0.1 % by weight
• The instructions in this Operator's Manual concerning environmental protection are also
valid for the use of biodegradable oil
• If additional hydraulic attachments are mounted or operated, use the same type of
biodegradable oil for these attachments to avoid mixtures in the hydraulic system.
Subsequent change from mineral oil to biodegradable oil must be carried out by
an authorised workshop or by your KRAMER-ALLRAD dealer
Serv-HB 34603_04 EN – Edition 2.0 * 34603_04s320.fm 3-22
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Maintenance and service work
3.30 Lubrication work
Caution!
In order to avoid damage to the lubrication points, lubricate with
lithium-saponified brand-name grease
☞ – see Fluids and lubricants on page 3-3
Lubricating the rear axle oscillation-type bearing
Important!
The machine has an oscillation-type rear axle. Grease the bearing at the latest
after every 50 service hours or once a week.
A ☞ Lubricate grease nipple A of the oscillation-type bearing
Fig. 79: Grease nipples for oscillation-type bearing
Lubricating the front and rear axle planetary drive bearings
☞ Lubricate grease nipples B (2x) on each planetary drive bearing every 50 service
hours or once a week
B
Fig. 80: Grease nipples on planetary drive bearings
Serv-HB 34603_04 EN – Edition 2.0 * 34603_04s320.fm 3-32
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Maintenance and service work
3.35 Tyre maintenance
Danger!
Improper tyre repairs –
Danger of accidents!
☞ All repair work on tyres and rims may only be carried out by authorised
workshops
Important!
Regular inspections of the tyres
• Improve operating safety
• Increase the service life of the tyres
• Reduce machine downtimes
• Refer to the table in chapter “Specifications” on page 2-7 for the authorised tyre
types and the correct tyre pressures. A tyre table sticker is also affixed on the
front window of the machine.
Daily tyre checks
☞ Carry out the following maintenance work once a day:
• Check tyre pressure
– see chapter “Specifications” on page 2-7
• Check tyres and rims for damage (cracks, ageing etc.) – also on the inside
• Remove foreign bodies from the tyre tread
• Remove traces of oil and grease from the tyres
Serv-HB 34603_04 EN – Edition 2.0 * 34603_04s320.fm 3-42
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Maintenance and service work
3.45 Cleaning the engine compartment
Danger!
Clean the engine at engine standstill only –
Danger of personal injury!
☞ Stop the engine before cleaning
☞ Remove the ignition key
☞ Apply the parking brake
☞ Switch off ignition and remove the ignition key
Caution!
The humidity penetrating the electronics causes it to fail and leads to engine
damage!
When cleaning the engine with a water or steam jet
☞ The engine must be cold
☞ Do not point the jet directly at any of the electric sensors such as
temperature and oil pressure switches or control valves.
☞ Protect all electric parts, such as the alternator, connectors etc. from
humidity
☞ If the water jet is unintentionally pointed at electric components, dry them
with compressed air and apply contact spray to them.
3.46 Screw connections, hinges
All screw connections must be checked regularly, even if they are not listed in the
maintenance plans.
Tighten loose connections immediately. Refer to chapter “Specifications” for the tightening
torques.
All mechanical pivot points on the machine (e.g. door hinges, joints) and fittings (e.g. door
arresters) must be lubricated regularly, even if they are not listed in the lubrication plan.
Serv-HB 34603_04 EN – Edition 2.0 * 34603_04s320.fm 3-52
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4.8
Injection line
(identical for cylinders 1 – 4)
Fuel leak line
(pump/nozzle)
To tank Fuel system
Serv-HB 34603_04 EN – Edition 2.0 * 34603_04s410.fm
Bleeding the fuel system
Slacken the banjo bolt
bleed with manual pump on fuel pump
Injection nozzle
Fuel injection pump (sepa-
rate)
Tappet
Caution!
Bear in mind the seal size as you
replace a fuel injection pump
Fuel pump
Maintenance can be carried out
Manual pump for bleeding
Fuel filter
34300s410_03.iso
4-6
Engine
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Engine
☞ Mount the cylinder-head bolts
➥ Tightening torque:
• 1st pass 30 Nm
• 2nd pass 80 Nm
• 3rd pass 160 Nm
• Angle for retightening: 90°
Caution!
8 6 4 5 9 Bear in the mind the order for tightening the cylinder-head bolts!
Manifold side ☞ See figure
10 3 1 2 7
Fig. 120: Mounting the cylinder-head bolts
☞ Insert the push rods
Fig. 121: Inserting the push rods
☞ Mount the rocker arm bracket and align it with the push rods
➥ Tightening torque: 21 Nm
☞ Set the valve clearance
Fig. 122: Mounting the rocker arm bracket
☞ Place the gasket for the cylinder-head cover
☞ Mount the cylinder-head cover
➥ Tightening torque 8.5 Nm
Fig. 123: Mounting the cylinder-head cover
Serv-HB 34603_04 EN – Edition 2.0 * 34603_04s410.fm 4-16
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Engine
☞ Tighten screw plug (1) with a new copper sealing ring.
1
☞ Tighten screw plug (1) with a new copper sealing ring.
1
Serv-HB 34603_04 EN – Edition 2.0 * 34603_04s410.fm 4-26
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Power train
5.6 Inching valve overview
Bleed valve for brake system P – control pressure