Three machines, one book: the 318, 418, and 418 Telescopic wheel loaders, all brought back to factory spec across 200 pages (OEM #50940186). Wiring diagrams trace every harness variant on the 318/418/418T chassis. Hydraulic schematics map the hydrostatic drive circuit, the work hydraulics, and the 418 Telescopic push-out ram system. Further sections walk through the Perkins 704-30 engine, planetary axles, steering, and brake circuits step by step. Torque tables hand you the real numbers: 600 Nm at the front axle mounting, 420 Nm on the wheel nuts, cylinder-head bolts from 13 Nm, and 250 Nm on the steering ram piston rod. SUSMIC NFPE fault codes and sensor error tables decode the 12-LED flash sequence, so there's no more guessing. Bookmarked and keyword-searchable, it opens on a tablet right next to the machine.
What's Inside This Gehl 418, 418T Manual
| System | Pages | Key Topics |
|---|---|---|
| General & Service Materials | 3 | Controls, Specifications, Maintenance, Sealing Kits, Lubricants, Perkins Engine, Hydrostatic Drive, Axles |
| Specifications (318 / 418) | 4-5 | Hydraulic System, Hydraulic Oil Reflux Filter, Gearboxes and Axles, Rear Axle Transfer Gearbox, Front and Rear Axle Differentials, Engine Fluids and Lubricants |
| Technical Specifications | 6-21 | Frame, Engine, Power Train, Axles, Brakes, Steering |
| Maintenance | 22-23 | Hydraulic System (Specific Safety Instructions, Checking the Hydaulic Oil Level, Topping Up the Hydraulic Oil, Changing the Hydraulic Oil, Hydraulic Oil Reflux Filter) |
| Maintenance Procedures | 24-33 | Hydraulic System, Hydraulic Oil Reflux Filter, Gearboxes and Axles, Rear Axle Transfer Gearbox, Front and Rear Axle Differentials, Engine Fluids and Lubricants |
| Maintenance Plan & Records | 34-37 | Proofs of Maintenance, Maintenance Plan 318 / 418, Models 308 63 / 311 66 (Overview), Maintenance Plan Model 311 00 (Overview) |
| Engine (Perkins) | 38-39 | Perkins Engine, Safety (Instructions), Specifications 704-30, Tightening Torques (Standard Torque Tensions for Screws and Nuts, Special Torque Tensions) |
| Engine (Perkins, Detailed) | 40-61 | Safety, Specifications 704-30, Tightening Torques, Crankcase Breather, Valve Cover, Rocker-Arm Shaft |
| Hydrostatic Drive | 62-63 | Hydraulic Pump, Variable Displacement Motor, Hydraulic Oil Circuit – Drive |
| Hydrostatic Drive (Pump & Motor) | 64-79 | Hydraulic Pump, Variable Displacement Motor, Hydraulic Oil Circuit, Adjustment Work, Service and Checking Instructions, Hydraulics Diagram |
| NFPE System & Diagnostics | 80-86 | Nfpe System (Susmic 12 Leds), Connection Diagram 318/418, Table of Errors |
| SUSMIC Diagnostics | 87-100 | Explanation of the Susmic-Dia 1, Procedures (Menu Numbers, Command Numbers), Activation of the Susmic-Dia 1 (Deactivation of the Susmic-Dia 1), Sensor Setup Procedure |
| Axles (Overview) | 101-102 | View – Front Axle, View – Rear Axle, Axle Body and Planetary Drive on Front and Rear Axle, Planetary Drive – Front and Rear Axle, Self-Locking Differential – Front and Rear Axle |
| Axles & Final Drives | 103-109 | Front Axle, Rear Axle, Axle Body, Planetary Drive, Self-Locking Differential, Transfer Gearbox |
| Brakes (Overview) | 110-111 | Service and Parking Brake, Brake Circuit – Service Brake, View – Parking Brake |
| Brakes | 112-115 | Service and Parking Brake, Brake Circuit, Inching Potentiometer, Parking Brake Lever, Parking Brake Adjustment, Pressure Switch |
| Steering (Overview) | 116-117 | Steering, Steering Circuit for 318 / 418 / 418 Telescopic Model: 308 63 / 311 66 / 311 00, Steering Rams on Front/Rear Axles for 318 / 418 Model: 308 63 / 311 66 |
| Steering | 118-128 | Steering Circuit, Steering Diagram, Steering Rams, Sevostat, Wheel Synchronization, Steering Stop Adjustment |
| Electrical System (Overview) | 129-130 | Electrical System, Control Valve Actuation 318 / 418; |
| Electrical System | 131-138 | Control Valve Actuation, Drive Switch Wiring, Wiring of Drive Direction Tip Switch, Control Lever, Actuation Lever, 3Rd Control Circuit |
| Wiring Diagrams | 139-147 | Spare Fuse, Interior Light, Cigarette Lighter, Working Headlights, Drive Switch, Lighting |
| Hydraulic System (Overview) | 148-149 | Hydraulic Circuit 318 / 418 Model: 308 63 / 311 66 (Circuit – Lift Ram, Circuit– Tilt Ram) |
| Hydraulic System | 150-159 | Hydraulic Circuit, Hydraulics Diagram, Pressure Line, Combined Suction and Reflux Filter, Control Valve, Hydraulic Oil Tank |
| Hydraulic Diagrams | 160-161 | Control Valve, Tilt Ram, Lift Ram, Control Ram, Detent, Pressure Relief Valve |
| Hydraulic System (Lift Ram) | 162-171 | Main Pressure Relief Valve, Standard Float Position, 3Rd Control Circuit, Lifting Circuit, Dumping Circuit, Anticavitation Valve |
| Hydraulic Valves & Filters | 172 | Lift Ram, Tilt Ram, Threaded Pin, Guide Bushing, Piston, Seals |
| Cab Heating | 173-174 | Heating Circuit, Heater Nozzle, Filter, Control Slide, Reflux, Feed |
| Cab Heating (cont.) | 175 | Heater Nozzle, Filter, Control Slide, Reflux, Feed, Front Window (Wiper Cover) |
| Controls & Instruments | 176-177 | Controls, Controls – Wheel Loader Model 318, 418 (Cab: Overview, Overview of Instrument Panel, Multifunctional Lever) |
| Operator Controls | 178-200 | Multifunctional Lever, Control Panel, Side Console, Instrument Panel Lights, Rocker Switch, Telltale |
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
Gehl 418 wheel loader engine ticking noise and loss of power under heavy bucket load p. 43
Remove the valve cover and inspect the rocker-arm shaft components. Set the cold engine valve tip clearance to 0.35 mm. If you pull the assembly, torque the cylinder-head bolts to 13 Nm in the sequence on page 43. Confirm the engine oil sits at 7 ltr. before restarting.
Manual Section: Valve Tip Clearances Check and AdjustmentHydrostatic drive tip switch fails to engage or machine refuses to move in forward or reverse p. 7
Trace the forward-reverse control wiring and drive switch connections. Confirm the boost pump charging pressure reaches 20 bar as specified on page 7. Test the variable displacement motor, then flush the hydrostatic drive circuit to restore proper fluid flow.
Manual Section: Hydrostatic Drive Troubleshooting (Forward-Reverse Control)Work hydraulics feel sluggish or lift cylinders fail to raise a full bucket p. 8
Check the main pressure relief valve and confirm the work hydraulics hit their 210+10 bar maximum service pressure per page 8. Drain the reservoir, then refill the hydraulic oil tank to its 50 l capacity. Swap the reflux filter insert.
Manual Section: Hydraulic System Oil Level Check & ChangeSteering wheel wanders during transport or front axle feels loose over rough terrain p. 13
Examine the steering rams and track-rod ends for excessive play. Torque the front axle mounting bolts to 600 Nm as listed on page 13. Adjust the steering stop so the cylinder cannot bottom, and check wheel synchronization. Finish by torquing all wheel nuts to 420 Nm.
Manual Section: Steering System AdjustmentFrequently Asked Questions
How do I reset a GEHL 418 / 418T?
There is no whole-machine 'reset' procedure in the manual. For control-system faults, though, sections 22.5.1 and 22.5.2 on pages 74-75 cover the hydrostatic drive: stop the engine, turn the ignition key to position '1', then check the forward-reverse control and inching potentiometer. For sensor errors, connect the SUSMIC-DIA 1 diagnostic tool and see the 'Error table' on page 84.
What are the torque specs for a GEHL 418 / 418T?
Several sections carry torque figures. General values for screws and nuts, plus specific ones like wheel nuts (420 Nm) and front axle mounting (600 Nm), sit in section TD.1.17 on page 13. Perkins engine torques are spelled out in section 01.3 on pages 42-43, and hydraulic-fitting figures appear in the "Torque Specifications" tables on pages 196-198.
What do GEHL 418 / 418T error codes mean?
Error codes live in the "Error table" inside the SUSMIC-DIA 1 operation manual, starting on page 84. It breaks down both system and sensor faults: GPI error number, signal source, type of error, LED error code, and the cause. GPI Error no. 1 for "Sensor voltage", for instance, flags a "Sensor voltage beyond the valid range". A fuller sensor-error list sits in section 5.1.1 on page 91.
How do I troubleshoot a GEHL 418 / 418T hydraulic or electrical issue?
Hydraulic problems point to the "Hydrostatic drive" section from page 62, which holds "Service and checking instructions" on page 63 and "Adjustment work" on page 69 for boost and high pressure. Electrical faults are covered in the "Electrical system" section from page 129, with diagrams on page 140. Drive electronics and tip switches get their own steps in sections 22.5.1 and 22.5.2 on pages 74-75, and the SUSMIC "Error table" is on page 84.
How will I receive this Gehl 418, 418T Service Manual?
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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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