Pre-delivery checks, tractor hookup, mill and blower operation, feeder adjustments, lubrication, transport and storage: Form No. 907585, the 92-page Gehl 125 Mix-all grinder mixer operator manual, walks through each one. Troubleshooting in this Gehl Mix-all operator manual PDF fills a solid share of the book, with charts split by mill and mixer drive, mill, mixing and hydraulics, so the symptom you see points to a likely cause and fix. Controls, guards and shields get their own illustrated section, and the inside back cover holds standard hardware torque values for Grade 2, 5 and 8 bolts plus metric 8.8. Run the tractor at rated PTO speed for a 2700 RPM mill cylinder, and swap the hydraulic oil filter every 100 hours of operation. A plugged mill on a loaded tank eats the afternoon. Bookmarked and text-searchable, this PDF is yours after one purchase, kept for as long as your 125 keeps grinding.
What's Inside This Gehl 125 Operator Manual
| System | Pages | Key Topics |
|---|---|---|
| Warranty | 2-3 | Warranty Coverage, Warranty Inclusions, Warranty Exclusions, Binding Authority |
| Introduction | 4 | Model and Serial Number Plates, Safety Alert Symbol |
| Specifications | 5-6 | Tank Capacity, Mill and Blower, Discharge and Unloading Conveyor, Feeder Attachments, Selectable Features |
| Checklists | 7-11 | Pre-Delivery Inspection, Feed Roll Feeder Attachment, Swinging Auger Feeder Attachment, Gravity Feeder Attachment, Delivery Checklist |
| Safety | 12-20 | Mandatory Safety Shutdown Procedure |
| Controls & Safety Equipment | 21-26 | Feeder Attachments, Guards & Shields |
| Operation | 27-39 | Mixer Power, Mill & Blower, Screens, Unplugging |
| Adjustments | 40-47 | Feeder Attachments, Mill/Blower Drive |
| Lubrication | 48-50 | General Information, Grease Fitting Locations |
| Service | 51-62 | Auger/Transmission Drive Shaft, Hydraulic Fittings, Hydraulic Motors, Shear Devices |
| Preparing for Field Operation | 63 | Tractor Connections, Mixer Preparation, Tractor PTO Speed |
| Transporting | 64-65 | Smv Emblem, Safety Chain, Auxiliary Lighting, Towing on Highway, Transport Lighting |
| Storage | 66 | Drain Plugs, Weather Cover, Water Accumulation Prevention |
| Troubleshooting | 67-72 | Mill & Mixer Drive, Mill, Mixing, Hydraulics |
| Set-Up & Assembly | 73 | Wheels and Tires, Drain Plugs, Drain Cover |
| Optional Features & Accessories | 74-75 | Electronic Scales & Components, Feeder Attachments |
| Decal Locations | 76-85 | General Information |
| Maintenance Log | 86-87 | Lubrication, Unloading Conveyor Winch, Pulleys, PTO Drive Guard, Drive Chain Tension, Hydraulic System Oil Level |
| Standard Hardware Torque Data | 91-92 | Unified National Thread, Grade Two, Grade Five, Grade Eight, Metric Course Thread, Grade Eight Point Eight |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Mill Hammer wear radius limit | 1/4 inch (6 mm) | p. 56 |
| Drive Belt initial tension | 3/8" (10 mm) deflection with an applied pressure of 80 lb (360 N) | p. 42 |
| Mill speed | 2700 RPM | p. 27 |
| Drive Belt normal tension | 3/8" (10 mm) deflection with an applied pressure of 60 lb (270 N) | p. 40 |
| Hydraulic Oil Filter replacement interval | 100 hours | p. 53 |
| Hammer rod cotter pin size | 3/16 x 1-1/4 inch | p. 57 |
| Intake Auger Shear Bolt gap limit | 1/8 inch (3 mm) | p. 58 |
| Main Drive Bearing lubrication interval | 500 hours | p. 53 |
| Hydraulic system pressure test | 2000 PSI | p. 70 |
| Hydraulic system oil flow test | 9.2 GPM at 1000 PSI | p. 70 |
| Tank Capacity | 125 cu ft | p. 5 |
| Mill Cylinder and Blower Speed | 2700 RPM | p. 5 |
Gehl 125 Common Problems This Manual Covers
Gehl Mix-All 125 grinder mixer intake auger not turning with the tractor PTO engaged
Run the Mandatory Safety Shutdown Procedure before you reach for anything. Inspect the intake auger Shear Device following page 58 and measure the gap between the Bolt head and the Hub. If that gap is less than 1/8 inch (3 mm), replace the Shear Bolt. Then work through the intake auger checks on page 67 before restarting.
Manual Section: Mill & Mixer Drive Troubleshooting p. 67Mill cylinder not turning when the tractor PTO is engaged at rated speed
Disengage the PTO and shut the tractor down. Check Drive Belt tension on the Mill/Blower Drive following page 40. Look for 3/8 inch (10 mm) of deflection with 60 lb (270 N) applied midway between the Sheaves. Page 42 says a new belt needs 80 lb (360 N) for the same deflection. Finish with the mill drive checks on page 67.
Manual Section: Mill & Mixer Drive Troubleshooting p. 67Grinder mill showing low capacity and feed material not ground to the right fineness
Verify the tractor holds rated PTO speed, which gives a Mill Cylinder speed of 2700 RPM per page 27. Shut down and inspect the Mill Hammers following page 56. Rotate them before the wear radius reaches 1/4 inch (6 mm). Confirm the correct mill screen is installed, then work through the mill checks on page 68.
Manual Section: Mill Troubleshooting p. 68Power shaft vibration at the tractor PTO connection during mill and mixer operation
Shut the tractor down and lock out the PTO before you touch the driveline. Inspect the power shaft and the PTO drive guard, then grease every fitting shown in the lubrication section starting on page 48. Check that the tractor connections match the setup on page 63, and work through the power shaft vibration checks on page 67.
Manual Section: Mill & Mixer Drive Troubleshooting p. 67Hydraulic pump squealing with slow auger operation and slow tank unloading on the mixer
Check the hydraulic system oil level first. Replace the Oil Filter if it is due; page 53 calls for a new one every 100 hours of operation, or sooner if needed. Inspect the hydraulic fittings for leaks. Work through the hydraulics checks on page 70, where relief valve pressure is listed at 2000 PSI. Have your dealer confirm it if the augers stay slow.
Manual Section: Hydraulics Troubleshooting p. 70Ground feed spilling out of the tank lid and material not mixing properly
Check the batch size against the 125 cu ft tank capacity listed on page 5, and stop grinding before the tank overfills. Verify the mixing auger is turning. If it is not, shut down and follow the drive checks on page 67. Then work through the mixing checks on page 69 before you load the next batch.
Manual Section: Mixing Troubleshooting p. 69Frequently Asked Questions
What are the replacement specifications for the grinding screens on a Gehl 125 grinder mixer?
The MX125 Mill is designed for use with various screens to accommodate different materials. Two screens of the customer's choice are furnished with the mixer. For a list of all available sizes, refer to the Optional Features and Accessories chapter (page 76). p. 31
What are the replacement specifications for the hammers on a Gehl 125 grinder mixer?
Mill hammers should be rotated before the wear radius reaches 1/4 inch (6 mm). A replacement set of 66 hammers is available by ordering GEHL part number 2E34. p. 56
What is the correct hydraulic system operating pressure for the Gehl 125 grinder mixer?
The mixer hydraulic system operating pressure range is normally 200 to 1500 PSI (1380-10,300 kPa). The pressure relief valve is factory set to a maximum of 2000 PSI (13,800 kPa). p. 35
How do you check the transmission oil level?
Check the transmission oil level after every 200 hours of operation by removing the plug on the side of the transmission. It requires 1-1/2 U.S. pints (0.7 liters) of SAE #140 gear lube. p. 48
What is the correct belt tension for the Mill/Blower drive?
Proper belt tension is measured by obtaining a 3/8 inch (10 mm) deflection of the belt while applying a 60 lb (270 N) force midway between the sheaves. A new belt should be adjusted for an initial tension of 3/8 inch (10 mm) deflection with an applied pressure of 80 lb (360 N). p. 42
What exactly do I receive with this Gehl 125 Operator Manual?
All 92 pages arrive as one searchable PDF at checkout. Read it at the desk, then take the phone out to the machine.
Is printing allowed for this Gehl 125 Operator Manual?
Yes. Print the sections you need to take out to the shop for your own use. Standard letter or A4 paper works.
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