This Gehl DL Series Dynalift Service Manual (OEM #907871) runs 580 pages on one job: keeping your DL6 through DL12 telehandler at factory spec. Electrical schematics come with full troubleshooting and testing steps. Hydraulic schematics trace every cylinder circuit, from the stabilizers out to the boom extend. Another 15 pages of fault-finding charts walk you through system failures instead of leaving you to guess. Torque and fluid specs sit up front: fill the hydraulic reservoir to 45 gal. (170 L), and torque the boom chain adjustment fasteners and inner boom slide pad bolts to 30 ft-lbs (40.7 Nm). With the machine down, every idle hour bleeds money, so the DL9 and DL10 sections get you the factory answer on the first try. Bookmarked by section and keyword-searchable: open it on a tablet at the machine and start wrenching.
What's Inside This Gehl DL6–DL12 Series Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety | 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 and Installation | 29-52 | Engine Removal, Engine Installation |
| Electrical Schematics, Troubleshooting Testing & Adjustment Procedures | 53-102 | General Table of Contents |
| Battery Removal & Installation | 103-108 | Battery Removal, Battery Installation |
| Steering Control Valve Removal & Installation | 109-120 | Steering Control Valve Removal, Steering Control Valve Installation |
| Transmission & Transfer Case Removal & Installation | 121-142 | General Table of Contents |
| Transfer Case Repair | 143-156 | Specifications, Torque Values |
| Rear Axle Removal and Installation | 157-166 | General Information, Rear Axle Removal, Rear Axle Installation |
| Front Axle Removal & Installation | 167-176 | General Information, Front Axle Removal, Front Axle Installation |
| Hydraulic Schematics, Troubleshooting Testing & Adjustment Procedures | 177-230 | General Table of Contents |
| Hydraulic Pump Removal & Installation | 231-244 | Frame Leveling Cylinder Removal & Installation, Mandatory Safety Shutdown Procedure, Relieving Hydraulic Pressure, Frame Leveling Cylinder Removal |
| Tilt Cylinder Removal & Installation | 245-252 | Mandatory Safety Shutdown Procedure, Relieving Hydraulic Pressure, Tilt Cylinder Removal, Tilt Cylinder Installation |
| Hydraulic Cylinder Repair | 253-262 | General Information, Cylinder Disassembly, Cylinder Assembly |
| Stabilizer Cylinder Removal & Installation | 263-268 | Mandatory Safety Shutdown Procedure, Relieving Hydraulic Pressure, Stabilizer Cylinder Removal, Stabilizer Cylinder Installation |
| Stabilizer Cylinder Repair | 269-280 | General Table of Contents |
| Slave Cylinder Removal & Installation | 281-288 | Mandatory Safety Shutdown Procedure, Relieving Hydraulic Pressure, Slave Cylinder Removal, Slave Cylinder Installation |
| Lift Cylinder Removal & Installation | 289-294 | Mandatory Safety Shutdown Procedure, Relieving Hydraulic Pressure, Lift Cylinder Removal, Lift Cylinder Installation |
| Boom Extend Cylinder Removal & Installation | 295-302 | Mandatory Safety Shutdown Procedure, Relieving Hydraulic Pressure, Extend Cylinder Removal, Extend Cylinder Installation |
| Boom Extend Cylinder Removal & Installation 4-Section Low Boom Models | 303-308 | General Information, Mandatory Safety Shutdown Procedure, Boom Extend Cylinder Removal, Boom Extend Cylinder Installation |
| Boom Extend Cylinder Removal & Installation 4-Section High Boom Models | 309-316 | General Information, Mandatory Safety Shutdown Procedure, Extend Cylinder Removal, Extend Cylinder Installation |
| Boom Assembly Removal & Installation | 317-324 | General Information, Boom Assembly Removal, Boom Assembly Installation |
| Single & Double Leaf Chain Adjustment | 325-328 | General Information, Leaf Chain Adjustment, Leaf Chain Maintenance |
| Inner Boom Section Removal & Installation | 329-338 | Mandatory Safety Shutdown Procedure, Relieving Hydraulic Pressure for the Tilt Cylinder, Relieving Hydraulic Pressure for the Boom Extend Cylinder, Inner Boom Removal |
| Telescoping Boom Double Chain & Roller Bearing Replacement | 339-346 | Mandatory Safety Shutdown Procedure, Double Chain Roller Bearing Replacement |
| Telescoping Boom Single Chain & Roller Bearing Replacement | 347-354 | Mandatory Safety Shutdown Procedure, Installation, Single Chain Roller Bearing Replacement |
| Intermediate Boom Section Removal & Installation | 355-364 | Mandatory Safety Shutdown Procedure, General Information, Intermediate Boom Removal, Intermediate Boom Installation |
| Boom Pad Replacement Procedure | 365-370 | General Information, Slide Pad Maintenance |
| Overview 4-Section High & Low Boom Models | 371-376 | General Information, Boom Components, Slide Pad Assemblies |
| Boom Assembly Removal & Installation 4-Section Low Boom Models | 377-384 | General Information, Boom Assembly Removal, Mandatory Safety Shutdown Procedure, Boom Assembly Installation |
| Boom Assembly Removal & Installation 4-Section High Boom Models | 385-392 | General Information, Boom Assembly Removal, Mandatory Safetyshutdown Procedure, Boom Assembly Installation |
| 1St Intermediate Boom Section 4-Section Low Boom Models Removal & Installation | 393-402 | Mandatory Safetyshutdown Procedure, General Information, 1St Intermediate Boom Removal, 1St Intermediate Boom Installation |
| 1St Intermediate Boom Section 4-Section High Boom Models Removal & Installation | 403-412 | Mandatory Safety Shutdown Procedure, General Information, 1St Intermediate Boom Removal, 1St Intermediate Boom Installation |
| 2Nd Intermediate Boom Section 4-Section Low Boom Models Removal & Installation | 413-426 | Mandatory Safety Shutdown Procedure, General Information, 2Nd Intermediate Boom Removal, 2Nd Intermediate Boom Installation |
| 2Nd Intermediate Boom Section 4-Section High Boom Models Removal & Installation | 427-440 | Mandatory Safety Shutdown Procedure, General Information, 2Nd Intermediate Boom Removal, 2Nd Intermediate Boom Installation |
| Inner Boom Section 4-Section High & Low Boom Models Removal & Installation | 441-448 | General Information, Inner Boom Removal, Inner Boom Installation |
| Boom Hydraulic Hose & Tube Replacement 4-Section Low & High Boom Models | 449-470 | General Information, Mandatory Safety Shutdown Procedure, Exterior Boom Hose Replacement, Install New Hoses, Interior Boom Hose Replacement, Inner Boom Hydraulic Tube Replacement |
| Boom Pad Overview 4-Section High & Low Boom Models | 471-478 | Front Slide Pads, Rear Slide Pads, Slide Pad Assemblies (Installation of Slide Pads, Slide Pad Maintenance) |
| Boom Pad Replacement 4-Section High & Low Boom Models | 479-512 | Outer Boom (Front -: Top Pads, Side Pads, Bottom Pads) |
| Boom Chain & Roller Replacement 4-Section High & Low Boom Models Overview | 513-516 | General Information, Mandatory Safetyshutdown Procedure |
| Top Inner Boom Chain & Roller Replacement 4-Section High & Low Boom Models | 517-528 | General Information, Top Inner Boom Chain, Mandatory Safety Shutdown Procedure, Top Inner Boom Chain Removal, Top Inner Boom Chain Installation |
| Bottom Inner Boom Chain & Roller Replacement 4-Section High & Low Boom Models | 529-540 | General Information, Bottom Inner Boom Chain, Mandatory Safety Shutdown Procedure, Bottom Inner Boom Chain Removal, Bottom Inner Boom Chain Installation |
| 2Nd Intermediate Boom Chain & Roller Replacement 4-Section High & Low Boom Models | 541-560 | General Information, 2Nd Intermediate Boom Chain, Mandatory Safety Shutdown Procedure, 2Nd Intermediate Boom Chain Removal, 2Nd Intermediate Boom Chain Installation |
| Outer Boom Chains & Roller Replacement 4-Section High & Low Boom Models | 561-562 | Outer Boom Chains (Outer Boomchain Replacement, Boom Chain Roller Bearing Replacement, Mandatory Safety Shutdown Procedure) |
| Boom Chain Adjustment 4-Section High & Low Boom Models | 563-568 | General Information, Mandatory Safety Shutdown Procedure, 4-Section Boom Chain Adjustment |
| Radiator Removal & Installation | 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
On the DL9, the boom won't lift under load and hydraulic functions feel weak or erratic
Start at the main relief valve setting on page 19. Connect a pressure gauge to the test port and confirm the system climbs to 3000 PSI (207 bar). Low pressure points you to the control components and flow divider covered in the troubleshooting steps; adjust or swap the faulty valves.
Manual Section: Hydraulic: Boom Lift TroubleshootingEngine temperature gauge spikes and transmission runs unusually hot during continuous heavy lifting cycles p. 569
Drain the transmission fluid and refill with exactly 16 qts. (15.1 L) of approved oil per page 16. Clear any debris packed into the radiator fins. If internal blockages remain, pull and flush the radiator assembly following page 569.
Manual Section: Radiator Removal & InstallationTelescoping boom extension movement is jerky and chains slap loudly against the inner boom sections p. 327
Inspect the boom chains for excessive slack or binding. Adjust the leaf chain tensioning nuts until tight, then torque the boom chain adjustment hardware to 30 ft-lbs (40.7 Nm) as directed on page 327. Lubricate the rollers and verify smooth boom extension without binding or jerking.
Manual Section: Single & Double Leaf Chain AdjustmentSteering wheel feels completely unresponsive or requires excessive physical effort to turn the tires p. 109
Measure the steering pressure at the control valve and confirm the gauge holds 2500 PSI (172 bar) at full lock, the figure listed on page 19. If it falls short, pull the steering control valve and inspect it using the disassembly procedure on page 109. Replace worn internal seals, then retest.
Manual Section: Steering Control Valve Removal & InstallationFrequently Asked Questions
What is the service procedure for GEHL DL series hydraulic or electrical faults?
On the DL10, electrical faults route you to the "ELECTRICAL SCHEMATICS, TROUBLESHOOTING TESTING & ADJUSTMENT PROCEDURES" section starting on page 53, with flowcharts and component tests. Hydraulic faults send you to the "HYDRAULIC SCHEMATICS, TROUBLESHOOTING TESTING & ADJUSTMENT PROCEDURES" section starting on page 177, which lays out pressure tests and adjustments for each hydraulic circuit.
What are the replacement specifications for Hydraulic filters?
It's a remote, replaceable 15 Micron element. Rated flow runs 70 GPM (265 L/min), rated pressure 800 PSI (55 bar), and by-pass pressure at full flow 45 PSI (3.0 bar).
What are the replacement specifications for Hydraulic hoses?
The replacement interior boom hoses are P/N L71391 (254" / 645 cm) and P/N L71390 (248" / 630 cm). Uncoil and mark each one before installation; each has a shorter split end of 8 inches (20 cm) for attachment.
What format is this Gehl DL6–DL12 Series 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 Gehl DL6–DL12 Series 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.
Document Quality
This document is a scanned PDF, not a native digital file. You can search and copy text throughout the manual due to an accurate OCR layer, ensuring all instructions and specifications are accessible. The text is consistently crisp and easy to read on every page. Diagrams and illustrations are high-quality raster images or photos, with all labels clearly readable, even when zoomed in. Pages are clean with no noticeable scan artifacts, stains, or skewed content. There are several "INTENTIONALLY BLANK" pages included as filler.
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