Weidemann Telescopic Loader T4512 Service Repair Manual – PDF DOWNLOAD

If you own, buy, or service a Weidemann T4512 telescopic loader, this is the repair manual the workshop is written around. It is not an operator’s booklet and it is not a parts-only catalogue. It is the official six-part service book: how to work safely on the machine, what pressures and fill quantities to use, how to test drive hydraulics, working hydraulics, VLS, steering and inching, how to R&R the engine, pumps, cylinders, axles and boom tubes, and how to read the hydraulic and wiring diagrams when a valve, sensor or lamp fails.

The factory preface is clear: the operating manual of the loader is also required to perform all work completely. Keep both books on the bench. This download is the repair manual itself — 546 pages, English, printable PDF, 185 MB — so you can search a component name and print only the job in front of you.

How the manual is built

The T4512 repair manual is organised in six parts. Every part then follows the same machine structure so you always know where you are:

Six parts of the book

• Part 1 — Safety
• Part 2 — Technical data, test equipment and special tools
• Part 3 — Inspection, maintenance work and troubleshooting
• Part 4 — Replacement and repair procedures
• Part 5 — Circuit diagrams and technical descriptions
• Part 6 — Documents from suppliers (to be supplemented on-site with the latest vendor pages)

Nine machine chapters inside each part

• Complete vehicle
• Engine
• Hydraulic system
• Drive and axles
• Brake system (mechanical part)
• Frame and telescopic arm
• Driver platform / cab
• Electrical system
• Attachments

Navigation: each part has its own table of contents. The complete index sits immediately before Safety. Each part also ends with its own index. Abbreviations and units come before the full contents list. Validity is type T4512, article number 1000235501, document 1000274281-2 dated 06/2013.

Why shops and owners buy this PDF

Complete contents — all six parts

Part 1 — Safety

Read this part before a spanner comes out. Each system has its own repair-safety chapter so the risks of oil injection, residual pressure, boom drop, battery current and hot engine work are not buried in one generic page.

• Symbols used in the manual
• Repair work on the complete vehicle and the matching safety regulations
• Safety regulations for work on the engine
• Safety regulations for work on the hydraulic system
• Safety regulations for work on drive and axles
• Safety regulations for work on the brake system
• Safety regulations for work on frame and telescopic arm
• Safety regulations for work on the electrical system

Part 2 — Technical data, test equipment and special tools

This is the specification drawer. Fill quantities, torques, pressure values and flow rates sit here so you are not borrowing numbers from a different Weidemann model. The tool list tells you what the procedure expects before the machine is opened.

• Overview and engine technical data
• Filling quantities
• Tightening torques
• Pressure values
• Flow rates
• Safety stickers
• Test equipment: hydraulic test pump, flow meter, alternator tester, magnetic field tester, test manometer, fuse tester set
• Special tools: drive-out and drive-in drift punches, sealing plates (2×), steering-cylinder sleeve, insertion tool, pin punch, electrical contact tool, half shells and puller, hose clamp, contact-removal tool, VLS induction-switch setting gauge, hose log book

Part 3 — Inspection, maintenance and troubleshooting

Use this part when the T4512 still runs but does not run right — weak travel, soft lift, VLS not holding geometry, heater dead, load display lying, or an electrical gremlin. Test reports for engine and telescopic arm give you a paper trail after inspection.

• Complete vehicle: engine test report, telescopic-arm test report
• Engine: check and adjust valve clearance, check exhaust system for leaks, check radiator installation, check radiator for leaks, engine troubleshooting
• Drive hydraulics: check and adjust starting speed, check and adjust pressure cut-off, check high pressure of the displacement pump, check supply pressure of the displacement pump, check signal pressure of the displacement pump, adjust travel speed, check and adjust control start of the displacement engine, check steering hydraulics, check and adjust inching
• Working hydraulics: check gear pump, check control-valve function, check throttle-control function, check Vertical Lift System (VLS), VLS electronics plug-in connector test instruction, check rear-hydraulics function, hydraulic-system troubleshooting
• Drive and axles: check engageable differential lock, check automatic differential lock, check and adjust steering, check water filling of the wheels, drive troubleshooting
• Brake system: check and adjust brake
• Frame and load arm: telescopic-arm troubleshooting
• Cab: check heater, cab troubleshooting
• Electrical system: check alternator, check starter motor, check temperature sensor, check tank sensor, calibrate load display, electrical-system troubleshooting

Part 4 — Replacement and repair

This is the longest part of the book and the reason most buyers download it. Every major component on the T4512 has a remove / prepare / install or seal path, including options such as High Flow, rear three-point, PTO motor, comfort control and US tool-holder lock.

Complete vehicle

• Helpful tips and replacing protective stickers

Engine, radiator, air filter, fuel and exhaust

• Replacing cover and holder, removing engine, preparing engine for installation, installing engine
• Replacing hydro bearings and coupling flange
• Cleaning the engine after the loader has tipped over
• Expansion reservoir and holder, radiator R&R, fan cowling, fan impeller and spacer
• Air-filter hoses and complete air filter
• Complete fuel filter, fuel pump, fuel lines, filler hose, tank-lock emergency opening, breather filter, tank ventilation hose, fuel tank, accelerator Bowden cable
• Tail pipe, exhaust silencer, holder, flame pipe, flexible pipe

Hydraulic system — complete vehicle, drive, steering, brake and working circuits

• Depressurising the hydraulic system
• Sealing a hydraulic cylinder and replacing the cylinder bearing
• Displacement pump R&R and shaft sealing-ring replacement; displacement-engine replacement
• Clean or replace priority valve, replace orbital steering unit, replace pulsation damper
• Inching device (brake hydraulics)
• Gear pump replace and seal; control valve remove, seal, install; retrofit latch on the control valve
• Overload cut-out valve
• 3/2 directional valve for high speed and 3/2 directional valve for differential lock
• Pressure-limiter valve on the compensating cylinder (comfort control)
• Throttle valve on the lifting frame
• 6/2 directional control valve for VLS
• Fan motor and cooling gear pump
• Lift cylinder, compensating cylinder, tilt cylinder, extension cylinder
• Lowering-brake valve, valve cartridge, emergency-lowering lowering-brake valve

Additional hydraulics, rear hydraulics, hydraulic locking, tank and lines

• Hydraulic motor for power take-off shaft (option)
• Seal hydraulic locking; locking cylinder for Euro mounting; cylinder for three-point rear mounting
• Control valve for rear hydraulics (option), mechanical three-way switching valve, rear-hydraulics switching valve
• Solenoid valve for comfort control, solenoid valve for fourth control circuit, 2/2 directional valve for two-hand operation, High Flow solenoid valve
• Hydraulic couplings on the lifting frame, fourth-circuit couplings, High Flow plug-in couplings, rear-hydraulics quick-release couplings, three-point plug-in couplings
• Hydraulic oil tank, complete return filter, hydraulic oil preheater (option)
• Hydraulic line, tilt-cylinder hydraulic line, hydraulic pipe, manifold

Drive, axles and steering cylinder

• Propeller-shaft replacement
• Front axle: remove, prepare new axle, install, seal
• Rear axle: remove, install, seal
• Steering cylinder: remove, seal, install

Brake system

• Service brake: disc, pads, lever, pedal, sliding bearings
• Parking brake: operating-lever replacement

Frame, holders, tool holder and telescopic arm

• Front mudguard, rear-view mirror (glass and complete), engine cover, retaining cable, cover lock and handle, engine-cover emergency unlocking
• Floor pan, registration-plate holder (option), rear panelling, rear weight
• Frame cover plate, engine-sump cover plate, engine-sump remove and attach, remote lubrication system
• Holders for tail lights, rear-view mirror, mudguard, mechanical locking bolt, air filter, fan and fuel filter
• Tool holder: locating pin, tool holder, Euro locking bolt, US tool-holder locking mechanism
• Telescopic arm: guide rail, protective cover, tipping bar and bearings, tilting lever and bearings
• Inner-tube remove and install, inner-tube sliding plate, outer-tube sliding plates
• Complete telescopic-arm remove and attach, front bearing, rear bearing
• Trailer coupling (option)
• Rear three-point (option): upper link, linkage draw bar, lower link, complete linkage, mounting, upper-link mounting, complete linkage R&R, PTO-shaft protection

Driver platform, cab, glass, seat, controls, heater

• FOPS protection grille (option), cab rear-view mirror, spot-lamp holder, rotating-beacon holder
• Wiper blade, wiper arm, washer reservoir, glued-in window glass
• Rear-window opening mechanism, rear window, stay, rubber buffer, locking handle
• Door glass, locking device, locking bolt, door locking mechanism, door handle, retaining strap, complete cab door
• Driver seat, complete safety belt, seat rails
• Floor mat, instrument panel detach/fasten and replace, front / side / rear panelling, roof lining, blind
• Multifunction lever, cross controller, additional-hydraulics operating lever, switching rod, working-hydraulics locking lever, throttle hand lever, manual inching (option)
• Complete cab remove and attach, documents box (option)
• Steering-wheel knob, steering wheel, steering column
• Cab heater and shut-off valve

Electrical system

• Alternator, starter, windscreen-wiper motor
• Battery disconnector, ignition lock, engine oil-pressure switch, engine temperature switch, brake switch, steering-column switch, cab switches
• Adjust and replace proximity switch; adjust and replace VLS initiator; tank sensor
• Relays, stop solenoid, solenoid-valve coil and core, variable-displacement-pump solenoid valve plus coil and core, control unit, fuse block
• Instrument cluster, load display, horn, warning buzzer (option), 12 V power socket
• Headlight with flasher unit, complete tail light, work light, number-plate light (option), rotating beacon (option), cab light
• 7-pole power socket and 3-pole power socket (option)

Attachments

• Ripping tooth of the earth bucket
• Pallet-fork locking device
• Silage-fork tines and silage-fork hydraulic cylinder
• Multi-purpose-bucket hydraulic cylinder and valve

Part 5 — Circuit diagrams and technical descriptions

When a test in Part 3 fails, this is where you prove the circuit. Hydraulic schematics sit next to the wiring diagram and the pin-out tables so you can chase a VLS initiator, a pump solenoid or a cab switch without guessing wire colours.

• Hydraulic circuit diagrams
• Wiring diagram
• Connector pin assignments
• Contact assignments
• Technical description — engine
• Technical description — hydraulics
• Technical description — drive and axles

Part 6 — Supplier documentation

The factory book points you at the component makers. The PDF includes the example / placeholder set so you know which vendor manuals belong on the shelf next to this file. Supplement on-site with the current engine, pump, motor and axle books for the serial on your machine.

• Engine operating manual (example)
• Engine workshop manual (example)
• Displacement-pump repair instruction (example)
• Displacement-engine repair instruction (example)
• Axle workshop manual (example)
• Electrical components

Who this download is for

• Farms and contracting yards running a Weidemann T4512 that need factory pressures, fill quantities and boom-tube procedures
• Independent workshops taking in compact telehandlers and wanting VLS, inching, displacement-pump and axle seal paths in English
• Mobile techs tracing a dead VLS initiator, load-display error, High Flow solenoid or rear-hydraulics valve
• Owners who bought a used T4512 without the paper workshop book and need article 1000235501 coverage
• Anyone planning engine-out, complete cab R&R, inner-tube rebuild or front/rear axle reseal

How to use the PDF on a real job

• Read Part 1 for that system, then confirm fill quantity, torque, pressure and flow in Part 2
• If the machine still drives, start in Part 3 with the matching test (pump pressures, VLS connector test, load-display calibration, heater, alternator)
• When a part is condemned, open the matching R&R in Part 4 — depressurise hydraulics before cracking a fitting
• Prove the circuit in Part 5 with the hydraulic diagram, wiring diagram and pin assignments
• Keep the T4512 operating manual beside this repair book, exactly as the factory preface requires
• Print only the pages for today’s job; keep the 185 MB file on the shop PC and a backup drive

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