This is the Gehl Service Manual for the 418 and 418T wheel loaders, form number 50940186, built around the Perkins 704-30 diesel engine. Its 200 pages are organized by system, covering controls, specifications, maintenance, the Perkins engine, hydrostatic drive, axles, brakes, steering, the electrical system, the hydraulic system and heating.The specification tables give engine data, capacities, service pressures and tightening torques, including the 420 Nm wheel-nut torque and the full Perkins engine torque list. Deeper chapters detail the hydrostatic pump and variable-displacement motor, the front and rear axles with planetary drives and self-locking differentials, the steering rams and wheel synchronization, the control valve and the lifting and dumping circuits, and the SUSMIC electrical diagnostics with its table of errors. Delivered as a searchable, printable PDF, it downloads instantly for the shop computer or a tablet at the machine.
What's Inside This Gehl 418, 418T Manual
| System | Pages | Key Topics |
|---|---|---|
| Machine Specifications | 3-21 | Frame, Engine, Power Train, Axles and Differentials, Brakes, Steering, Hydraulic System, Lubricants and Fluids |
| Maintenance & Service Schedule | 22-37 | Hydraulic Oil Level Check, Hydraulic Oil Change, Hydraulic Oil Reflux Filter, Gearboxes and Axles, Rear Axle Transfer Gearbox, Front and Rear Axle Differentials, Engine Fluids and Lubricants, Maintenance Plan and Records |
| Engine (Perkins) | 38-61 | Perkins Engine Specifications, Tightening Torques, Crankcase Breather, Valve Cover, Rocker-Arm Shaft |
| Hydrostatic Drive & Susmic Diagnostics | 62-100 | Hydraulic Pump, Variable Displacement Motor, Hydraulic Oil Circuit, Nfpe System (Susmic), Connection Diagram, Table of Errors, Susmic-Dia 1 Diagnostics, Sensor Setup Procedure |
| Axles & Final Drives | 101-109 | Front Axle, Rear Axle, Axle Body, Planetary Drive, Self-Locking Differential, Transfer Gearbox |
| Brakes | 110-115 | Service Brake, Parking Brake, Brake Circuit, Inching Potentiometer, Parking Brake Lever Adjustment, Pressure Switch |
| Steering | 116-128 | Steering Circuit, Steering Rams, Sevostat, Wheel Synchronization, Steering Stop Adjustment, Steering Diagram |
| Electrical System & Wiring Diagrams | 129-147 | Control Valve Actuation, Drive Switch Wiring, Control Lever, 3rd Control Circuit, Working Headlights, Interior Light, Spare Fuse, Wiring Diagrams |
| Hydraulic System & Diagrams | 148-172 | Lift Ram Circuit, Tilt Ram Circuit, Control Valve, Hydraulic Oil Tank, Suction and Reflux Filter, Main Pressure Relief Valve, Lifting and Dumping Circuit, Anticavitation Valve |
| Cab Heating | 173-175 | Heating Circuit, Heater Nozzle, Filter, Control Slide, Front Window Wiper Cover |
| Controls & Operator Instruments | 176-200 | Cab Overview, Instrument Panel, Multifunctional Lever, Control Panel, Side Console, Rocker Switch, Telltale Lights |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Wheel nut torque | 420 Nm | p. 13 |
| Track-rod end (steering ram) torque | 160 Nm | p. 13 |
| Piston rod (steering ram/track rod) torque | 250 Nm | p. 20 |
| Front axle mounting torque | 600 Nm | p. 20 |
| Engine Displacement | 2955 cm³ | p. 6 |
| Engine Oil Capacity | 7 ltr. | p. 31 |
| Hydraulic Oil Tank Capacity | 50 l | p. 31 |
| Fuel Tank Capacity | 60 ltr. | p. 31 |
| Wheel Nut Tightening Torque | 420 Nm | p. 13 |
| Engine Valve Tip Clearance (cold) | 0.35 mm | p. 6 |
| Boost Pump Charging/Boost Pressure | 20 bar | p. 7 |
| Max. Service Pressure (Work Hydraulics) | 210+10 bar | p. 8 |
Gehl 418, 418T Common Problems This Manual Covers
Weak or slow lift and tilt
Low oil, a control-valve fault or a misadjusted main pressure relief valve make the loader lift and tilt slowly or weakly. The Hydraulic System chapter covers the control valve, relief valves and the lifting and dumping circuits.
Manual Section: Hydraulic System p. 148Loss of hydrostatic drive power
A drive that lags or loses power often traces to the hydraulic pump, variable-displacement motor or low boost pressure. The Hydrostatic Drive chapter covers these parts, the oil circuit and the adjustment work.
Manual Section: Hydrostatic Drive p. 62Steering wanders or feels heavy
Worn steering rams, a faulty sevostat or lost wheel synchronization make the loader steer poorly. The Steering chapter provides the steering circuit, diagram, ram service and stop adjustment.
Manual Section: Steering p. 116Hard starting or engine fault
Glow-plug, injection or valve-clearance problems on the Perkins 704-30 lead to hard starts and rough running. The Perkins Engine chapter covers the specifications, tightening torques and adjustment procedures.
Manual Section: Perkins Engine p. 38Service or parking brake trouble
Poor stopping or a parking brake that drags points to the brake circuit, inching potentiometer or parking-brake adjustment. The Brakes chapter covers the service and parking brake and their circuits.
Manual Section: Brakes p. 110Axle, planetary, or differential wear
Front and rear axle wear shows up in the planetary drive and self-locking differential. The Axles chapter covers the axle body, planetary drive, differential and transfer gearbox with their torque values.
Manual Section: Axles p. 101Electrical or control-valve actuation faults
A dead circuit or an unresponsive control valve traces to the wiring, drive switches or actuation lever. The Electrical System chapter covers control-valve actuation, drive-switch wiring and the lighting circuits.
Manual Section: Electrical System p. 129Frequently Asked Questions
Which loaders does this manual cover?
It is the Gehl 418 and 418T wheel loader Service Manual, form 50940186, covering the Perkins 704-30 diesel engine across 200 pages.
Does it cover the hydraulic and hydrostatic systems?
Yes. The Hydraulic System chapter covers the control valve, relief valves and lift and dump circuits, and a separate Hydrostatic Drive chapter covers the pump and variable-displacement motor. p. 148
Are engine torque specifications included?
Yes. The Perkins Engine chapter lists the standard and special tightening torques for the 704-30, from cylinder-head bolts to injection-pump and manifold fasteners. p. 38
Does it explain the SUSMIC diagnostic errors?
Yes. The manual documents the SUSMIC (NFPE) system with its LED indicators, connection diagram and a table of errors for reading electrical faults. p. 80
How will I receive this Gehl 418, 418T Service Manual?
Download lands instantly. The full 200-page searchable Service Manual is yours the moment payment clears, ready on a laptop, tablet, or phone out in the shop.
Can I print specific sections of this Gehl 418, 418T Service Manual?
Yes. There is no DRM or copy protection, so print the whole manual or just the pages you need. Any home or office printer handles it.
Does this Gehl 418, 418T Service Manual cover the hydraulic system?
Yes. Full hydraulic diagrams come included, mapping circuits, valve locations, and component specs for the Gehl 418, 418T.
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