Part of the Case IH Repair Manuals.
Swivel gearbox leaking, cutterbed knives worn round, a drive belt slipping: the Case IH 8309, 8312 service manual PDF, 480 pages under OEM Rac 8-95590, walks you through both rotary mower conditioners. Hydraulic coverage runs from schematic to cylinder rebuild, with troubleshooting charts that take you from a slow lift to the tongue position cylinder, lift master, or lift slave behind it. Chassis work fills the largest share of the book: wheels and tires, implement drive line, clutch drive shaft, main gearbox, header flotation, hay conditioner, jackshaft and U-joint assemblies, and full swivel gearbox teardown. Set your windrow width anywhere from 30 IN to 75 IN (762 mm to 1905 mm), and pack the chain case with 1 LB (0.45 kg) on a service, 2 LB (0.9 kg) on a repair. Print the sections you need and let the pages get greasy.
What's Inside This Case IH 8309, 8312 Manual
| System | Pages | Key Topics |
|---|---|---|
| 8309 and 8312 Rotary Mower Conditioner | 1-6 | - |
| General | 7-40 | Index (Introduction, Safety Rules, General Machine Specifications, And Standard Torque Specifications, Maintenance and Lubrication, Safety Decals) |
| Hydraulic System | 41-60 | Index (Hydraulic System) |
| Chassis | 61-216 | Index (Wheels and Tires, Drive Line, Header Cutting Height and Flotation, Cutterbed, Hay Conditioner, Swivel Gearboxes) |
| 8312 Rotary Mower Conditioner General | 217-262 | General Information, Safety Precautions, Machine Specifications, Torque Specifications, Maintenance, Lubrication |
| 8312 Rotary Mower Conditioner Hydraulic System | 263-286 | Hydraulic Schematic, Troubleshooting, Tongue Position Cylinder, Lift Master Cylinder, Lift Slave Cylinder |
| 8312 Rotary Mower Conditioner Chassis - Wheels, Tires, and Drive Line | 287-368 | Wheels and Tires, Drive Line, Implement Drive Line, Clutch Drive Shaft, Main Drive Gearbox, Drive Belt Adjustment |
| 8312 Rotary Mower Conditioner Chassis - Header, Cutterbed, and Hay Conditioner | 369-452 | Header Cutting Height, Flotation, Cutterbed and Knives, Hay Conditioner, Jackshaft Assemblies, U-Joint Assemblies |
| 8312 Rotary Mower Conditioner Chassis - Swivel Gearboxes | 453-480 | Swivel Gearboxes, Removal, Installation, Disassembly, Inspection, Assembly |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Knife circle diameter | 23.62 IN (600 mm) | p. 17 |
| Windrow width (adjustable) | 30 IN to 75 IN (762 mm to 1905 mm) | p. 19 |
| Length of conditioner rolls | 75-1/4 IN (1191 mm) | p. 17 |
| Chain Case lubricant quantity (service or rebuild) | 1 LB (0.45 kg) | p. 26 |
| Chain Case lubricant quantity (repair) | 2 LB (0.9 kg) | p. 26 |
| Cutterbed drain plug torque | 22 to 25 LB-FT (29 to 34 N-m) | p. 28 |
| Cutterbed fill plug torque | 22 to 25 LB-FT (29 to 34 N-m) | p. 28 |
| Ball end play | 0.025 IN (.635 mm) | p. 77 |
| Right end header flotation spring scale reading | 75 to 100 LB (34 to 45 kg) | p. 153 |
| Left end header flotation spring scale reading | 100 to 125 LB (45 to 57 kg) | p. 153 |
| Disc speed | 2600 rpm | p. 230 |
| Hay conditioner speed | 900 rpm | p. 230 |
Case IH 8309, 8312 Common Problems This Manual Covers
Case IH 8312 driveline U-joint vibration and knocking under load, header loses power
Pull the shields and check each U-joint for play by hand. Measure ball end play at the CV assembly; anything past 0.025 IN (.635 mm) on page 77 means the joint is done. Clean and grease the splines, then torque the clutch shaft clamp bolts to 60 LB-FT (81 N-m).
Manual Section: Drive Line Inspection p. 77Chainbox rattling or knocking, drive chain feels loose, and the cutterbed quits turning partway through a cut
Pop the chain case cover and push on the chain midspan. Deflection over 1/4 IN (6 mm), per page 423, means adjust the idler or replace a stretched chain. Inspect sprocket teeth for hooking, then refill the case with 1 LB (0.45 kg) of lubricant before buttoning it up.
Manual Section: 8312 Rotary Mower Conditioner Chassis - Header, Cutterbed, and Hay Conditioner p. 423Ragged uneven stubble, knives chipped or worn round, disc bolts backing out after mowing
Shut down, chock the wheels, and turn each disc by hand. Replace knives that are cracked, bent, or worn back past the 23.62 IN (600 mm) knife circle on page 17. Torque the bolts to 70 LB-FT (95 N·m), and confirm each knife swings freely.
Manual Section: Cutterbed and Knives Inspection p. 156Header rides heavy on one end, scalps ground in turns, leaves uncut strips
Hook a spring scale under the right end of the header and lift. Reading should fall between 75 and 100 LB (34 to 45 kg) per page 153; adjust the flotation springs until it does. Check both tires at equal pressure and grease the frame pivots before rechecking.
Manual Section: Chassis p. 153Hay comes out unconditioned or slugging, rolls bang and pass crop unevenly across the windrow
Bar the rolls over by hand and watch the lobes mesh; retime them if they touch. Tighten the timing clamp bolt to 200 LB-FT (271 N-m) as shown on page 422, then set the conditioner drive belt tensioner spring to 8-3/4 IN (222 mm) and reset windrow width.
Manual Section: Hay Conditioner Roll Timing Adjustment p. 422Frequently Asked Questions
What are the torque specifications for Grade 5 bolts on the Case IH 8309/8312?
For Grade 5 bolts, the torque specifications vary by size. For example, a 1/4-20 bolt requires 8.4 LB-FT (11 N-m), a 1/2-13 bolt requires 76 LB-FT (105 N-m), and a 1-8 bolt requires 645 LB-FT (875 N-m). p. 18
What is the correct cutterbed oil capacity for a Case IH 8309, 8312 rotary mower conditioner during service or repair?
When performing a service or repair on the cutterbed, the capacity is 1.75 U.S. quarts (1.7 liters). For a full rebuild, the capacity is 2 U.S. quarts (1.9 liters). p. 26
How often should the oil in the cutterbed be changed?
It is extremely important to change the oil in the cutterbed after the first 40 hours of operation, and thereafter every 100 hours of operation or at the beginning of each season, whichever comes first. p. 22
What is the required torque for the wheel bolts on the Case IH 8309/8312?
The wheel bolts must be tightened to 120 LB-FT (162 N-m). It is recommended to check the torque of the wheel bolts after one hour of operation. p. 64
What is the correct procedure for adjusting the hay conditioner drive belt tension?
The tension of the hay conditioner drive belt is correct when the length of the tensioner spring is 8-3/4 IN (222 mm). Measure the length from the inside of the hook to the end of the spring plug. p. 362
Is this Case IH 8309 manual a PDF I download?
Straight to your device: 480 pages of searchable Service Manual, downloadable the moment payment goes through.
Can I print just the pages I need from this Case IH 8309 manual?
Yes, printing is unrestricted: a single page, a chapter, or the lot, on letter or A4.
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