Track down electrical faults and hydraulic pressure drops on your Gehl CTL85 Compact Track Loader with this 331-page service manual PDF (OEM #917338). The guide includes complete electrical wiring diagrams, wire harness routing, and hydraulic schematics. Service Data covers 20 pages of system diagrams, followed by 73 pages of troubleshooting organized by symptom: traveling faults, lift arm problems, bucket issues, and auxiliary hydraulics. The Disassembly and Assembly section details the HST pump, gear pump, control valves, cylinders, and travel motor step by step. Factory specifications are provided throughout, such as setting crawler tension between 25 and 50 mm and torquing M6 x 1.0 fasteners (JIS 10.9) to 9.8 ±0.5 N·m. Bookmarked by section and fully searchable, this file helps you find the right repair procedure quickly.
What's Inside This Gehl CTL85 Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety | 3-12 | Safety Alert Symbol, Safety Precautions, Cautions When Working |
| Service Data | 13-58 | Electrical Wiring Diagram, Wire Harness Diagram |
| Function | 59-108 | Air Conditioner System |
| Disassembly and Assembly | 109-258 | HST Pump, Gear Pump, Control Valve, Sub Valve, Pilot Valve, Proportional Control Solenoid Valve, Cylinders, Travel Motor |
| Troubleshooting | 259-331 | Overall Machine, Traveling, Lift Arm, Bucket, Auxiliary Hydraulics, HST Pump |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Bolts and nuts (JIS strength category 10.9) - M6 x 1.0 General tightening points | 9.8 ±0.5 N·m | p. 30 |
| Crawler tension | 25 to 50 mm | p. 20 |
| Track roller A - Allowable value A | 208 mm | p. 110 |
| Sproket - Allowable value A | 402 mm | p. 110 |
| Idler - Allowable value A | 394 mm | p. 110 |
| Hydraulic hose - 1/4 hose fitting size - Union nut (G) torque | 24.5+4.9 N·m | p. 28 |
| Hydraulic oil tank filter replacement interval | Every 1000 hrs | p. 18 |
| Fuse box - FUSE 1 | 10A | p. 46 |
| Battery terminals tightening | fasten terminals tightly | p. 10 |
| Lever play (Arm) | 4 +0/-0.5 mm | p. 20 |
| Engine Oil Pan Capacity | 13.2 L | p. 18 |
| Hydraulic Oil Tank Capacity | 60 L | p. 18 |
Gehl CTL85 Common Problems This Manual Covers
Loader loses second gear and has no high-range travel speed after 1000 hours of operation p. 16
Inspect the pilot valve and 2nd speed control system. Measure the hydraulic system set pressure to ensure it reaches 34.5 MPa as specified on page 16. Torque any loose 1/4 hydraulic hose union nuts to 24.5+4.9 N·m per page 28, then test travel speed.
Manual Section: Traveling: Fails or Speed IssuesLift arm and bucket actuators feel extremely sluggish, accompanied by complete hydraulic pressure loss p. 17
Verify the hydraulic oil tank is filled to its 60 L capacity according to page 18. Inspect the control valve for leaks and measure the set pressure. Adjust the valve to maintain exactly 3.3 MPa as detailed on page 17 to restore lift arm speed.
Manual Section: Lift Arm: Fails or Slow OperationTracks frequently derail or slip during aggressive turns due to loose crawler belt tension p. 20
Measure the crawler tension at the center of the track frame. Adjust the grease cylinder until the clearance is exactly 25 to 50 mm as shown on page 20. Inspect track roller A for extreme wear, replacing it if the diameter falls below 208 mm per page 110.
Manual Section: Traveling: Fails or Speed IssuesElectrical controls fail to respond and the engine refuses to start when turning the ignition key p. 46
Check the main fuse box and replace FUSE 1 if blown, verifying it uses a 10A rating according to page 46. Clean corrosion off the battery posts and fasten terminals tightly per the instructions on page 10. Test the ignition circuit using the wiring diagram.
Manual Section: Overall Machine: No Operation PossibleFrequently Asked Questions
How do I reset a Gehl CTL85 fault code?
The fault detection function for the proportional controller is retained until the error is eliminated and the system is reset at power-up. Once the underlying issue is resolved, cycling the power clears the fault code.
What do Gehl CTL85 error codes mean?
The Gehl CTL85 proportional controller uses LED blink patterns to indicate specific errors. For example, a sensor error due to proportional voltage input outside the 2.25 to 2.75 V range results in 1 blink, while an overcurrent error for solenoid A (current 2.0 A or more) results in 5 blinks. Other blink counts indicate different solenoid or voltage input issues.
Document Quality
This document is a scanned PDF with an OCR layer, allowing you to search and copy the full text. The text quality is consistently crisp and easy to read throughout. Diagrams and illustrations are raster images, meaning they may pixelate slightly at high zoom, but their labels are generally clear and readable. Pages are clean with no notable scan artifacts, stains, or skewed content. There are no blank or filler pages present.
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