Part of the John Deere Repair Manuals.
All 298 pages of this John Deere 920/930 Mower-Conditioner Technical Manual (OEM #TM1548) focus on one machine family: the 920 and 930 Mower-Conditioners, from cutterbar to carrier frame. Inside, you get a full power train section covering PTO hookup, driveline, slip clutch, main drive gear case, and cutterbar drive gear case, plus dedicated troubleshooting charts for each system. Wiring diagrams and hydraulic schematics for the lift cylinders and center link round out the back of the manual. When you're at the cutterbar, set gear backlash at 0.25–0.56 mm for the main drive case and torque the gear hub to 306–372 N·m before buttoning it up. Your machine is down and the field isn't waiting. Pull up the bookmark, jump straight to conditioner roll arm removal or hydraulic diagnosing, and get the right number the first time. One download, works on any device, right there on the tractor.
What's Inside This John Deere 920, 930, 920 Mower-Conditioners, 930 Mower-Conditioners Manual
| System | Pages | Key Topics |
|---|---|---|
| Introduction | 2 | Foreword, Fos Manuals, Reference, Technical Manuals, Machine Service, Component Manuals, Component Service |
| Dealer Presentation Sheet | 3-6 | - |
| General | 7-26 | Safety, Specifications, General Information, Lubrication |
| Power Train | 27-122 | General Information, Diagnosing Malfunctions, PTO Hookup, Driveline, Slip Clutch, Main Drive Gear Case, Cutterbar Drive Gear Case, Miscellaneous Drive Components |
| Cutting Components | 123-186 | General Information, Diagnosing Malfunctions, Cutterbar, Knives |
| Platform | 187-200 | Platform Description, Gauge Shoes, Remove Platform, Install Platform, Adjust Cut Height, Adjust Platform Float |
| Conditioner | 201-252 | General Information, Diagnosing Malfunctions, Roll Bearings and Arms, Rolls, Impeller |
| Carrier Frame | 253-274 | General Information, Diagnosing Malfunctions, Carrier Frame and Components, Tongue, Wheel Hub and Support, Electrical |
| Hydraulics | 275-294 | General Information, Diagnosing Malfunctions, Hydraulic Lift Cylinders, Hydraulic Center Link |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Cutterbar Drive Belt Spring Length (hook-to-hook) | 275—285 mm (10-27/32—11-7/32 in.) | p. 122 |
| Quill Mounting Cap Screws Torque | 102 N·m (75 lb-ft) | p. 126 |
| Cutterbar Gear Hub Torque | 306—372 N·m (225—275 lb-ft) | p. 126 |
| Main Drive Gear Case Gears Backlash | 0.25—0.56 mm (0.010—0.022 in.) | p. 30 |
| Cutterbar Drive Gear Case Gears Backlash | 0.25—0.50 mm (0.01—0.02 in.) | p. 30 |
| Knife Bolt Torque | 150 N·m (110 lb-ft) | p. 126 |
| Knife Pivot Hole Excessive Wear (Replacement Value) | 2 mm (3/32 in.) over initial hole diameter | p. 184 |
| 920 Mower-Conditioners | ||
| Slip Clutch Spring Length (540 RPM) | 41 mm (1-5/8 in.) | p. 30 |
| Hydraulic Pressure to Lift Platform | 13,790 kPa (2,000 psi) | p. 17 |
| Cutterbar Oil Reservoir Capacity | 9.5 L (10 U.S. qt.) | p. 17 |
| 920 and 930 Mower-Conditioners | ||
| Slip Clutch Spring Length (1000 RPM) | 38 mm (1-1/2 in.) | p. 30 |
| 930 Mower-Conditioners (S.N. —986000) | ||
| Hydraulic Pressure to Lift Platform (S.N. —986000) | 14,479 kPa (2,100 psi) | p. 19 |
John Deere 920, 930, 920 Mower-Conditioners, 930 Mower-Conditioners Common Problems This Manual Covers
John Deere 920 Mower-Conditioner platform won't raise, raises slowly, or one side lags p. 279
Diagnose the lift system on page 279 before pulling cylinders. A plugged orifice or worn piston seals are the most common causes. Verify the tractor remote valve delivers at least 13,790 kPa (2,000 psi); pressure below that won't fully lift the platform. If one side lags, bleed both cylinders using the step-by-step procedure on page 288.
Manual Section: HydraulicsGrinding or clunking noise from gearbox during operation, gear teeth worn or chipped p. 30
Drain the main drive gear case and check the oil for metallic debris before measuring backlash. Main drive gear backlash spec is 0.25—0.56 mm (0.010—0.022 in.) and cutterbar drive gear backlash is 0.25—0.50 mm (0.01—0.02 in.) per page 30. Replace any gear pair showing pitting or cracked teeth before circulating debris reaches the bearings.
Manual Section: Power TrainSlip clutch slipping under normal field load or PTO requires excessive power to drive
Remove and disassemble the slip clutch; spring free length at 1000 RPM should measure 38 mm (1-1/2 in.) per page 30. Springs measuring short allow the clutch to slip under normal load. Inspect friction discs and pressure plates for glazing or heat bluing, and follow driveline malfunction diagnostics if excessive PTO drag persists after reassembly.
Manual Section: Power TrainStrips of uncut material left across field or ragged, uneven cut after header pass p. 184
Check each knife per page 184. Pivot hole wear over 2 mm (3/32 in.) beyond original diameter means replacement; torque new knife bolts to 150 N·m (110 lb-ft). Measure cutterbar drive belt spring hook-to-hook length against the 275—285 mm (10-27/32—11-7/32 in.) spec on page 122. A slack belt drops blade speed and leaves streaks in the windrow.
Manual Section: Cutting ComponentsCracked or broken cutterbar housing with vibration and structural damage during cutting operation p. 126
Inspect the housing for cracks at quill mounting points and gear case flanges. Torque quill mounting cap screws to 102 N·m (75 lb-ft) and cutterbar gear hub to 306—372 N·m (225—275 lb-ft) per page 126. Loose fasteners cause fretting that progresses to fracture. Check the U-joint coupler for worn crosses that transfer shock loads into the housing.
Manual Section: Cutting ComponentsFrequently Asked Questions
How to reset the drive belt tension on Z920M?
To adjust the cutterbar drive belt tension, turn nuts (A) until the spring dimension (B) is within 275—285 mm (10-27/32—11-7/32 in.). This procedure ensures proper belt tension for optimal operation.
What are the replacement specifications for Gearbox gears?
For Main Drive Gear Case gears, the backlash specification is 0.25—0.56 mm (0.010—0.022 in.). For Cutterbar Drive Gear Case gears, the backlash specification is 0.25—0.50 mm (0.01—0.02 in.). These specifications are important for proper gear operation after replacement or assembly.
How do you fix john Deere 920 Mower-Conditioner platform won't raise, raises slowly, or one side lags?
Diagnose the lift system on page 279 before pulling cylinders. A plugged orifice or worn piston seals are the most common causes. Verify the tractor remote valve delivers at least 13,790 kPa (2,000 psi); pressure below that won't fully lift the platform. If one side lags, bleed both cylinders using the step-by-step procedure on page 288.
How do you fix grinding or clunking noise from gearbox during operation, gear teeth worn or chipped?
Drain the main drive gear case and check the oil for metallic debris before measuring backlash. Main drive gear backlash spec is 0.25—0.56 mm (0.010—0.022 in.) and cutterbar drive gear backlash is 0.25—0.50 mm (0.01—0.02 in.) per page 30. Replace any gear pair showing pitting or cracked teeth before circulating debris reaches the bearings.
How will I receive this John Deere 920, 930?
Instant PDF download. You get the full 298-page searchable Technical Manual immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Are there any print restrictions on this John Deere 920, 930?
Yes, print as many copies as you want, and there are no restrictions. Many mechanics print the section they need and bring it to the shop floor.
Are hydraulic system diagrams in this John Deere 920, 930?
Yes. The manual includes a hydraulic system diagram covering the main circuits.
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