This 156-page Case IH SMX91 Repair Manual (OEM #86630606) goes system by system through the SMX91 Mower-Conditioner, from PTO assembly and slip clutch through cutter bar, wobble drive gearbox, conditioner rolls, and the full reel system. Inside you get page after page of exploded-view diagrams paired with step-by-step rebuild procedures for every major assembly. Open to the Attachments/Headers section and you'll find knife assembly and replacement, wobble drive teardown, main gearbox overhaul, conditioner roll R&R, and complete reel service, including tine bar clearance, shaft end play, and cam track procedures. Check the slip clutch torque at 445 - 460 N·m (325 - 342 ft. lbs.) and confirm the lubrication points before you re-engage the PTO. Every hour your mower sits is money. Search by keyword or jump to any section with built-in bookmarks and get back to cutting.
What's Inside This Case IH SMX91, SMX91 Mower-Conditioner Repair Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information | 9-22 | Foreword, Precautionary Statements, Safety, Ecology and the Environment, International Symbols, Identification Number, How the Mower-Conditioner Functions, Power Distribution |
| Implement Power Take-Off (PTO) | 23-38 | PTO (Assembly, Telescoping Shaft and Tube, Front Primary PTO Assembly, Shaft Shields, Joint Replacement, Quick-Detachable Yoke, Secondary PTO Drive Shaft), Slip Clutch |
| Hydraulic Systems | 39-44 | Hydraulic Cylinders (Hydraulic Cylinders, Optional) |
| Frames | 45-68 | Tongue and Jack, Windrow Shields (Fluffing Baffle, Swathgate), Lift Frame / Roll Frame / Header Frame |
| Electrical System | 69-74 | Implement Lights (Trailing Lights Wire Harness, Installing the Socket) |
| Cutter Bar | 75-88 | Knife Assembly, Knife Sections, Knife Guards, Knife Replacement, Sickle Drive |
| Wobble Drive Gearbox | 89-98 | Knife Arm, Eccentric Bearing, Removal and Installation |
| Header Drive | 99-116 | Drive Chains, Sprockets, Main Gearbox |
| Conditioner Rolls and Drive System | 117-132 | Conditioner Rolls, Roll Gap Adjustment, Drive Chain, Roll Replacement |
| Reel | 133-146 | Tine Bars, Shaft Bearings, Belt Tension, Cam Track, Reel Drive |
| Safety Decals | 147-156 | - |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Slip Clutch Torque | 445 - 460 N·m (325 - 342 ft. lbs.) | p. 38 |
| Reel Drive Belt Tension Force | 778 - 890 N·m (175 - 200 ft. lbs.) | p. 135 |
Case IH SMX91, SMX91 Mower-Conditioner Common Problems This Manual Covers
Case IH SMX91 sickle bar stops suddenly with heavy vibration, knife sections won't cut
Inspect all knife guards for cracks, bending, or worn ledger plates before anything else. Remove damaged guards and check knife sections for broken or missing rivets. Replace any cracked or deformed knife sections per the procedure starting. After reassembly, verify slip clutch torque is within 445 - 460 N·m (325 - 342 ft. lbs.) per page 38, because an over-tightened clutch will bind the drive instead of protecting it.
Manual Section: Knife Assembly ReplacementWobble drive gearbox runs rough or knocks, cutter bar oscillation becomes uneven
Remove the wobble drive gearbox per the procedure and inspect the knife arm, eccentric bearing, and housing for wear or cracking. Check for loose or sheared fasteners at the gearbox mounting flange. Inspect the main gearbox input shaft and bevel gears for pitting or spalling if noise transfers through the driveline. Torque all fasteners to spec from the general torque chart on page 12 before reinstalling.
Manual Section: Wobble Drive Gearbox Removal and InstallationConditioner rolls fail to crimp hay, material passes through without conditioning
Pull the conditioner rolls per and measure the roll gap at both ends. Uneven gaps cause single-side bypass. Adjust roll gap following the procedure until gap is consistent across the full roll width. Inspect roll shells for worn flutes or rubber bonding failure. Check the conditioner drive chain tension and sprocket teeth for hooked or missing profiles before reinstalling.
Manual Section: Conditioner Rolls ReplacementPTO driveline vibrates or clunks at field speed, universal joints run hot p. 29
Disengage PTO and support the driveline before touching any components. Inspect PTO joint crosses and bearing cups for play or seized needles per the replacement procedure on pages 29-32. Check telescoping shaft tubes for wear and confirm the slip clutch slips cleanly at 445 - 460 N·m (325 - 342 ft. lbs.) per page 38. A clutch locked beyond that range transmits shock loads straight to the joints. Regrease all cross journals to spec after assembly.
Manual Section: Implement Power Take-Off (PTO)Reel rotates inconsistently or belt slips under crop load, tine bars cavitate
Check reel drive belt condition for glazing, cracking, or fraying. Adjust belt tension so that a force of 778 - 890 N·m (175 - 200 ft. lbs.) at a reel tine bar is required to slip the belt in the variable drive sheave, per page 135. If tension is correct and slipping persists, remove the reel shaft bearing covers and inspect bearings for roughness or end play per the procedure on . Replace worn bearings and reset end play before tensioning the belt.
Manual Section: Reel Shaft Bearings ReplacementHydraulic cylinder won't hold position, header drifts down during transport or operation p. 46
Isolate the circuit and check for external leakage at the cylinder rod seal and port fittings first. Remove the cylinder per page 46 and disassemble to inspect the piston seal, rod wiper, and barrel bore for scoring. Replace all seals as a set. Never reuse old seals on a reassembled cylinder. Torque cylinder port fittings and mounting hardware to the values shown in the torque chart on page 12 after installation.
Manual Section: Hydraulic Cylinders RepairFrequently Asked Questions
What fluids and capacities does this machine require?
The SMX91 Mower-Conditioner requires specific lubricants. For hydraulic systems, HY - Tran Ultra is used, available in 1-gallon, 2.5-gallon, or 5-gallon containers. Gearboxes require 80W90 SAE API GL5 gear oil, also available in 2.5-gallon or 5-gallon containers. All grease fittings should use High Viscosity Lithium Base - NLGI#2 grease, supplied in cartridges.
What are the hydraulic system specifications?
The hydraulic system uses HY - Tran Ultra hydraulic oil. Specific torque values are provided for hydraulic fittings, such as 13 N·m (10 ft lbs) for 1/8"-27 pipe thread fittings and 16 N·m (12 ft lbs) for 1/4"-18 pipe thread fittings. For adjustable fittings, standard torque data for hydraulic tubes and fittings is provided in a detailed table.
What torque specifications are listed?
The manual provides extensive torque specifications, including minimum hardware tightening torques for Metric and Inch hardware in detailed tables. Specific examples include tightening the knife head bolt to 190 N·m (140 ft. lbs.), locknuts for knife sections to a maximum of 8 - 11 N·m (70 - 100 in. lbs.), and the wobble drive gearbox cap screw to 108 N·m (80 ft. lbs.). Hydraulic tube and pipe thread fitting torques are also specified, such as 13 N·m (10 ft lbs) for 1/8"-27 pipe thread.
How do you fix case IH SMX91 sickle bar stops suddenly with heavy vibration, knife sections won't cut?
Inspect all knife guards for cracks, bending, or worn ledger plates before anything else. Remove damaged guards and check knife sections for broken or missing rivets. Replace any cracked or deformed knife sections per the procedure starting. After reassembly, verify slip clutch torque is within 445 - 460 N·m (325 - 342 ft. lbs.) per page 38, because an over-tightened clutch will bind the drive instead of protecting it.
How will I receive this Case IH SMX91, SMX91 Mower-Conditioner Repair Manual?
Immediate download of the complete 156-page searchable Repair Manual. Access it on any device, from a laptop at your desk to a phone in the field.
Is this Case IH SMX91, SMX91 Mower-Conditioner Repair Manual printable?
Yes. The PDF has no DRM restrictions, so print any page or section you need for your shop. Works with any standard printer.
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