This is the factory service manual for the Gehl DL Series Dynalift telescopic handlers, Form No. 907871, covering the DL6, DL7, DL8, DL9, DL10, DL11, and DL12. Across 580 pages it documents the John Deere 4045D, John Deere 4045T, and Perkins 1004-4T diesel engines used across the range.The manual is broken into safety, general specifications, engine, electrical, steering, power train, axles, and a large hydraulic and telescoping-boom section, with removal, installation, testing, and adjustment procedures throughout. Torque charts, fluid capacities, and pressure settings are included.Owners and independent mechanics use it to chase electrical no-start faults, test and adjust the hydraulics, rebuild cylinders, adjust and replace boom chains and slide pads, and pull the engine. The PDF has a text layer and bookmarks, downloads instantly after purchase, and prints on standard paper.
What's Inside This Gehl DL6–DL12 Series Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety & Precautions | 5-10 | Mandatory Safety Shutdown Procedure, Safety Rules and Reminders, Modifications, Nameplates, Markings and Load Capacities |
| General Information & Specifications | 11-28 | Torque Charts, Fluid Capacities & Types, General Specifications, Lifting Performance, Loader Performance, General Dimensions |
| Engine Removal & Installation | 29-52 | Engine Removal, Engine Installation |
| Electrical Systems & Battery | 53-108 | Electrical Schematics, Electrical Troubleshooting Testing & Adjustment Procedures, Battery Removal, Battery Installation |
| Drivetrain, Axles & Steering | 109-176 | Steering Control Valve Removal & Installation, Transmission & Transfer Case Removal & Installation, Transfer Case Specifications, Transfer Case Torque Values, Rear Axle Removal & Installation, Front Axle Removal & Installation |
| Hydraulic Schematics & Troubleshooting | 177-230 | Hydraulic Schematics, Hydraulic Troubleshooting Testing & Adjustment Procedures |
| Hydraulic Cylinder & Pump Service | 231-302 | Hydraulic Pump Removal & Installation, Frame Leveling Cylinder, Tilt Cylinder, Hydraulic Cylinder Disassembly & Assembly, Stabilizer Cylinder, Slave Cylinder, Lift Cylinder, Boom Extend Cylinder, Relieving Hydraulic Pressure |
| Boom Extend Cylinder & Assembly Service | 303-338 | Boom Extend Cylinder Removal & Installation (4-Section Low/High Boom), Boom Assembly Removal & Installation, Single & Double Leaf Chain Adjustment, Inner Boom Section Removal & Installation |
| Telescoping Boom Chain, Bearing & Pad Replacement | 339-376 | Double & Single Chain Roller Bearing Replacement, Intermediate Boom Section Removal & Installation, Boom Pad Replacement Procedure, Slide Pad Maintenance |
| Boom Section Removal & Installation (4-Section Models) | 377-448 | Boom Assembly Removal & Installation (4-Section Low/High Boom), 1st Intermediate Boom Section Removal & Installation, 2nd Intermediate Boom Section Removal & Installation, Inner Boom Section Removal & Installation |
| Boom Hoses, Slide Pads & Chain/Roller Replacement | 449-568 | Boom Hydraulic Hose & Tube Replacement, Boom Pad Overview & Replacement, Top/Bottom Inner Boom Chain & Roller Replacement, 2nd Intermediate & Outer Boom Chain Replacement, Boom Chain Adjustment |
| Cooling System | 569-580 | Radiator Removal, Radiator Installation |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Boom chain adjustment torque | 30 ft-lbs (40.7 Nm) | p. 327 |
| Inner Boom Section bottom slide pads bolts torque | 30 ft-lbs (40.7 Nm) | p. 336 |
| Hydraulic System Reservoir Capacity | 45 Gal. (170 L) | p. 16 |
| Fuel System Fuel Tank Capacity | 30 Gal. (114 L) | p. 16 |
| Transmission Oil Capacity with Cooler | 16 qts. (15.1 L) | p. 16 |
| Main Relief Pressure (Hydraulic) | 3000 PSI (207 bar) | p. 19 |
| Steering System Pressure | 2500 PSI (172 bar) | p. 19 |
| Outside Turn Radius | 12’-2” (3.7 m) | p. 19 |
| DL6 (thru s/n 50513) | ||
| Engine Crankcase Capacity (with filter) | 8.5 qts. (8 L) | p. 15 |
| DL7, DL9, DL11, DL12 (s/n 50514 and up) | ||
| Engine Crankcase Capacity (with filter) | 15.5 qts. (14.7 L) | p. 15 |
| DL-6, DL-7, DL-8 | ||
| Recommended Tire Inflation | 70 psi (480 kPa) | p. 27 |
| Overall Height | 7’-10” (2.4 m) | p. 28 |
Gehl DL6–DL12 Series Common Problems This Manual Covers
Weak boom power or hydraulic leaks
Loss of lifting and boom power, or fluid leaks under load, are common on hard-worked telehandlers and usually trace to fluid condition, clogged filters, pump wear, or internal leaks. The hydraulic testing section helps you pinpoint the circuit.
Manual Section: Hydraulic Schematics, Troubleshooting Testing & Adjustment Procedures p. 177No-start or intermittent shutdown
These machines depend on safety interlocks, so a no-start or a machine that dies after starting often comes from battery and wiring faults, connectors, or an interlock switch. The electrical section covers schematics and test procedures.
Manual Section: Electrical Schematics, Troubleshooting Testing & Adjustment Procedures p. 53Boom leaf chains stretch
Telescoping-boom leaf chains stretch with use and must be checked and readjusted to keep the boom sections synchronized and safe. This section gives the adjustment procedure and torque value.
Manual Section: Single & Double Leaf Chain Adjustment p. 325Worn boom slide pads
As slide pads wear, the boom develops play and feels loose or sloppy under load. The boom pad replacement section covers inspection, slide pad maintenance, and the pad bolt torque.
Manual Section: Boom Pad Replacement Procedure p. 365Heavy or unresponsive steering
Steering that feels heavy, wanders, or responds inconsistently often points to the steering control valve or its hydraulic supply. This section covers removing, servicing, and reinstalling the valve.
Manual Section: Steering Control Valve Removal & Installation p. 109Boom drifts down under load
A boom that creeps down or a cylinder that will not hold usually means worn or damaged cylinder seals. The hydraulic cylinder repair section covers disassembly, seal replacement, and reassembly.
Manual Section: Hydraulic Cylinder Repair p. 253Frequently Asked Questions
Which models does this manual cover?
It covers the Gehl DL Series Dynalift telescopic handlers, Form No. 907871: DL6, DL7, DL8, DL9, DL10, DL11, and DL12.
Which engines does it cover?
These DL series machines were built with John Deere 4045D, John Deere 4045T, and Perkins 1004-4T diesel engines. The Engine Removal and Installation section covers pulling and refitting the engine. p. 29
Does it cover boom chain adjustment?
Yes. The Single and Double Leaf Chain Adjustment section covers checking, adjusting, and maintaining the telescoping boom chains, including the adjustment torque value. p. 325
Can it help me troubleshoot the hydraulics?
Yes. The hydraulic schematics, troubleshooting, testing, and adjustment section starts on page 177 with test procedures and pressure settings for the boom, steering, and drive circuits. p. 177
What format is this manual in?
Instant PDF download. The full 580-page searchable Service Manual lands the moment payment clears. Open it on a laptop, tablet, or phone right in the shop.
Am I able to print pages from this manual?
Yes, print as many copies as you want; there are no restrictions. Plenty of mechanics print just the section they need and carry it to the shop floor.
Are there hydraulic schematics in this Gehl DL6–DL12 Series manual?
Yes. This manual carries hydraulic system diagrams, circuit schematics, and component specifications.
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