A sheared transmission drive bolt or a plugged mill halfway through a batch is the day this book was written for: the Gehl 170 Mixall operator manual PDF, a 97-page factory document (OEM number 907084) for the grinder mixer. Troubleshooting charts for the mill drive, mixing auger, unloading conveyor, hydraulic pump and governor sit beside unplugging procedures, screen installation and a maintenance log broken into 10, 50, 100 and 200 hour service points. Adjustments, lubrication and feeder attachment setup fill a large share of the pages, so your settings come straight from Gehl. Set the mill/blower drive belt to 3/8 inch deflection under 60 lb pressure midway between the sheaves (80 lb on a new belt), then check wheel lugs at 90 ft-lb (124 Nm) every 50 hours. A guessed lug torque can put your wheel in the ditch. Bookmarked and text-searchable, the file prints cleanly too, so the pages can go to the bench and get greasy.
What's Inside This Gehl 170 Mixall Operator Manual
| System | Pages | Key Topics |
|---|---|---|
| Warranty | 2-3 | Warranty Coverage, Dealer Service, Replacement Parts, Warranty Exclusions |
| Introduction | 4 | Serial Number Plate, Safety Alert Symbol |
| Specifications | 5-6 | Tank Capacity, Hydraulic System, Mill Blower Characteristics, Feeder Attachment Specifications, Tractor Power Requirements |
| Checklists | 7-13 | Pre-Delivery Inspection, Feed Roll Feeder Attachment, Swinging Auger Feeder Attachment, Power Bale Feeder Attachment, Gravity Feeder Attachment, Delivery Checklist |
| Safety | 14-24 | Mandatory Safety Shutdown Procedure, Safety Alert Symbol, Rotating Driveline, Hydraulic Hose Inspection, Transport Safety |
| Controls & Safety Equipment | 25-31 | Concentrate Hopper, Discharge Conveyor, Feeder Attachments, Electronic Weigh Scales, Guards and Shields, Hitchjack |
| Operation | 32-45 | Emergency Shutdown, Telescoping Drive, Hydraulic System, Mill Blower Operation, Screen Installation, Unplugging Procedures |
| Adjustments | 46-53 | Concentrate Auger Drive, Discharge Chute Crank Tension, Saf Brake Tension, Feed Roll Height, Governor Adjustment, Unloading Conveyor Brake Tension |
| Lubrication | 54-56 | Transmission Oil Level, Drive Chains, Hydraulic Reservoir, Grease Fittings, Wheel Bearings |
| Service | 57-66 | Concentrate Auger, Discharge Conveyor Auger, Hydraulic Reservoir, Hydraulic Pump, Intake Auger, Mill Hammers |
| Preparing for Field Operation | 67-68 | Tractor Connections, PTO Shaft, Drawbar, Mixer Lubrication, Tank Lid, Discharge Chute |
| Transporting | 69-70 | SMV Emblem, Reflectors, Safety Chain, Transport Lighting, Towing |
| Storage | 71 | Drain Plugs, Covers, Weather Covers |
| Troubleshooting | 72-78 | Mill Drive, Mixing Auger, Unloading Conveyor, Hydraulic Pump, Feeder Attachments, Governor |
| Set-Up & Assembly | 79 | Wheels, Tires, Drain Plugs, Power Bale Feeder |
| Optional Features & Accessories | 80-82 | Double Bagger Attachment, Electronic Scales, Audible Alarm Kit, Molasses Attachment, Unloading Conveyor Extensions, Winch Drive Reduction Kit |
| Decal Locations | 83-89 | General Information, New Decal Application, Decal Set, Paint Notice |
| Maintenance Log | 90-91 | Service Every 10 Hours, Service Every 50 Hours, Service Every 100 Hours, Service Every 200 Hours |
| Standard Hardware Torque Specifications | 96-97 | Unified National Thread, Grade 2, Grade 5, Grade 8 |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Mill/Blower Drive Belt tension | 3/8" deflection with 60 lb pressure | p. 49 |
| Transmission Drive Shear Bolt | 3/8 x 1-1/4 inch Grade 5 | |
| Mill/Blower Drive Belt initial tension | 3/8" deflection with 80 lb pressure | p. 50 |
| Wheel Lug torque | 90 ft-lb (124 Nm) | p. 64 |
| Wheel Lug Torque | 90 ft-lb | p. 64 |
| Wheel Bolt Torque | 90 ft-lb (124 N-m) | p. 79 |
| Tank Capacity | 170 cu ft | p. 5 |
| Mill Cylinder Speed | 2700 RPM | p. 5 |
Gehl 170 Mixall Common Problems This Manual Covers
Gehl 170 Mixall grinder mixer with tractor PTO hooked up and mill drive engaged, power shaft vibration
Check the tractor connections, PTO shaft and drawbar setup following page 67 before chasing parts, and per the warning there make sure the Locking Coupler on the Telescoping Drive is properly engaged and the Telescoping Drive Shield turns freely before starting the tractor. Verify the telescoping drive is set up per the Operation section starting page 32. Then work down the power shaft vibration causes in the Mill & Mixer Drive chart on page 72, shutting down fully before touching any rotating driveline.
Manual Section: Mill & Mixer Drive p. 72Tractor PTO engaged at the transmission drive shear flange, mixing auger not turning
Inspect the cap screw in the Transmission Drive Shear Flange following page 41 after a full safety shutdown. On the 170, replace a sheared one only with a regular Grade 5, 3/8 x 1-1/4 inch hex head cap screw threaded into the drive sprocket. Then work through the mixing auger checks on page 72.
Manual Section: Mill & Mixer Drive p. 72With the PTO engaged and the mill/blower drive belt loose, mill not turning
Check Mill/Blower drive belt tension following page 49: you want 3/8 inch deflection with 60 lb pressure applied midway between the sheaves. A new belt gets an initial tension of 3/8 inch deflection at 80 lb, per page 50. If tension is right, work the mill not turning checks on page 72.
Manual Section: Mill & Mixer Drive p. 72Mill grinding coarse with screen installed, material not ground to the desired fineness
Verify the screen is the right one and seated correctly using the Screen Installation steps in the Operation section starting page 32, and never operate the mill unless the Mill Screen Cover is closed and properly latched. Inspect the mill hammers per the Service section starting page 57. Check that the mill cylinder reaches the 2700 RPM listed on page 5, then work the fineness checks on page 73.
Manual Section: Mill p. 73With the mill blower running during grinding, material blocking in the hopper
Remove all power using the Mandatory Safety Shutdown Procedure in the Safety section starting page 14 before reaching in. Clear the hopper with the Unplugging Procedures in the Operation section starting page 32. Then check the hopper blocking causes listed on page 73 before restarting the mill.
Manual Section: Mill p. 73Mixer hydraulic system running, augers operating too slow and hydraulic pump squealing
Check the hydraulic reservoir level following the Lubrication section on page 54, and service the reservoir and hydraulic pump per the Service section starting page 57. Inspect every hose using the Hydraulic Hose Inspection guidance in the Safety section starting page 14. Then work the pump squealing and slow auger checks in Hydraulics - All Mixer Models.
Manual Section: Hydraulics - All Mixer ModelsFrequently Asked Questions
What are the torque specifications for a Gehl 170?
Torque specifications depend on the bolt size and grade. For example, a 1/4-20 Grade 5 bolt requires 9 lb-ft (dry) or 75 lb-in (lubed), while a 1-8 Grade 8 bolt requires 900 lb-ft (dry) or 680 lb-ft (lubed). p. 96
What are the replacement specifications for the transmission shear bolt on the Gehl 170, Gehl Mixall?
The Transmission Drive Shear Flange uses a regular Grade 5, 3/8 x 1-1/4 inch Hexagon Head Cap Screw. A 3/8 inch Jam Nut is used to lock the position of the screw. p. 63
What are the replacement specifications for the front and rear drive chains on the Gehl 170, Gehl Mixall grinder mixer?
All drive chains should be lubricated every 5 hours of operation. For best results, use a good grade of foaming aerosol lubricant, such as NAPA Chain and Cable Lubricant, which increases chain life 3 to 4 times over motor oil. p. 54
What is the hydraulic oil capacity and filter replacement interval for the Gehl 170, Gehl Mixall grinder mixer?
The hydraulic reservoir requires at least 10 U.S. gallons (38 liters) of hydraulic transmission fluid. The oil filter should be replaced after every 100 hours of operation, using part number 048959. p. 54
How do you adjust the Mill/Blower drive belt tension?
Proper belt tension is measured by obtaining a 3/8 inch deflection of the belt while applying 60 lb of pressure at the midway point between the sheaves. For a new belt, use an initial tension of 3/8 inch deflection with 80 lb of pressure. p. 49
Do I get instant access to this Gehl 170 Operator Manual?
Delivery is instant: a 97-page searchable PDF is yours the second checkout clears. Laptop, tablet, or phone, all fine.
Is this Gehl 170 manual print-friendly?
Yes. It prints from any PDF reader, so run off the pages you need for your own repair work.
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