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Part of the Case Repair Manuals.
This 919-page Case Corporation 1085B, 1086B Service Manual (OEM #8-44630) puts the complete cruz-air excavator platform under one cover, from engine and fuel system through steering, power train, brakes, and hydraulics. Open it up and you get full wiring diagrams for the electrical system, hydraulic schematics covering the steering and outrigger pumps, swing motor, and control valves, plus a torque specifications section that spans both U.S. and metric hardware. You get exploded views for the boom, turntable, and swing gearbox too, so parts identification stops being a guessing game. Torque the wheel lug nuts to 420-430 lb-ft (570-583 N-m), and set the tool cylinder capscrews at 1200-1300 lb-ft on lubricated threads. Stop tearing into the machine on hunches pulled from an old forum thread. It's bookmarked by section, so you can jump straight to Steering or Hydraulics from your phone and start turning wrenches.
What's Inside This Case Corporation 1085B, 1086B Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 3-34 | Safety Rules, Service Manual Introduction |
| Engine | 35-268 | Engine and Radiator Removal and Installation, Engine Accessories, Cylinder Head and Valve Train, Cylinder Block, Pistons, Rods, Camshaft Main Bearings, Oil Seals |
| Fuel System | 269-346 | Fuel Lines, Fuel Tank, And Engine Controls, Fuel System and Filters, Bosch Fuel Injection Pump, Drive Gear, And Timing, Fuel Injectors |
| Electrical | 347-433 | Removal and Installation of Starter and Alternator, Electrical System Specifications and Troubleshooting, Wiring Diagrams, Batteries, Starter, Alternator, Collector Ring |
| Steering | 434-477 | Steering System Troubleshooting, Steering Control Valves, Steering Relief Valve and Steering Reversal Valve, Steering Axle and Tie Rod |
| Power Train | 478-609 | Torque Converter, Transmission, Transmission Controls, Drive Shafts, Axle Differential, Axle Planetaries |
| Brakes | 610-719 | Air Compressor and Governor, Air Reservoir and Relief Valve, Brake Valve, Relay Valve, And Pressure Reducing Valve, Brake Actuator, Digging Brake Control Valve |
| Hydraulics | 720-855 | Hydraulic Pump for Steering and Outside Control Valve, Hydraulic Pump for Outrigger and Inside Control Valve, Inside and Outside Control Valves, Swing Motor, Hydraulic Swivel |
| Mounted Equipment | 856-916 | Controls and Linkages, Outriggers, Swing Geabox and Swing Brake, "E" Boom, "Y" Boom, Turntable, Bearing, And Related Parts |
| Schematic | 917-919 | - |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Wheel Lug Nuts Torque | 420 to 430 pound-feet (570 to 583 N m, 58 to 59 kg/m) | p. 607 |
| Tool Cylinder Capscrew Torque | 1200-1300 lb-ft (1625-1760 Nm) (lubricated threads) | p. 854 |
| Piston OD at 12 mm From the Bottom, 90 Degrees From Piston Pin Standard Size | 101.873 to 101.887 mm | p. 26 |
| Service Cylinder Sleeve Machine Cylinder Block Bore to | 104.485 to 104.515 mm | p. 26 |
| Main Bearing Oil Clearance | 0.041 to 0.119 mm | p. 28 |
| Cylinder Head Bolts Torque | 93 lb ft (126 Nm) (12.6 kgm) | p. 32 |
| Injection Pump Mounting Bolts Torque | 18 lb ft (24 Nm) (2.4 kgm) | p. 289 |
| Fuel Tank Capacity | 50 gallons | p. 12 |
| Engine Oil Capacity - With filter change | 17 quarts | p. 13 |
| 6T-590 and 6TA-590 Engine | ||
| Piston Rings No. 1 Compression (6T-590 and 6TA-590 Engine) End Gap in 102.02 ID | 0.40 to 0.70 mm | p. 27 |
| 6T-590 | ||
| Fuel Injectors Opening Pressure (New) | 3550 to 3670 PSI (24 476 to 25 303 kPa) (245 to 253 Bar) | p. 327 |
| 6TA-590 | ||
| Fuel Injectors Opening Pressure (New) | 3190 to 3310 PSI (21 994 to 22 821 kPa) (220 to 253 Bar) | p. 328 |
Case Corporation 1085B, 1086B Common Problems This Manual Covers
Engine won't start or cranks slowly with no ether odor detected
Follow the cold start troubleshooting to check the ether injection system and electrical power supply. Verify battery terminals are clean and fully charged, then check the starter circuit draw. Confirm idle speed is set to 700 to 750 RPM on page 22 once running, and check glow plug or ether solenoid wiring if the engine still won't fire cold.
Manual Section: Engine Cold Start System TroubleshootingFuel injection pump throws a communication fault or engine surges and misses at idle
Use the fuel injection troubleshooting to narrow down whether it's electrical or mechanical. Check injection pump mounting bolts are torqued to 18 lb ft (24 Nm) on page 289, since a loose pump mount can cause timing drift and rough idle. Test injector opening pressure against 3550 to 3670 PSI for the 6T-590 engine on page 327, and torque the injector retaining nut to 44 lb ft (60 Nm) on reinstall.
Manual Section: Diesel Fuel Injection System TroubleshootingTurbocharger shows scoring or shaft damage after high exhaust temperature events
Pull the turbo and go through the failure analysis to identify whether it's a lubrication issue or foreign material ingestion. Check for oil starvation first, since a scored bearing surface almost always traces back to low or contaminated oil supply. Inspect the compressor and turbine wheels for contact damage, and verify oil supply line fittings are clear before installing a replacement unit.
Manual Section: Turbocharger Failure AnalysisFrequently Asked Questions
What technical questions owners of CASE CORPORATION 1085B and 1086B search for regarding reset procedures, torque specs, and error codes?
Owners often search for reset procedures like bleeding the hydraulic system (see page 746/919 for removing air from the hydraulic system), specific torque specifications such as engine mount bolts (130 to 140 pound-feet, page 36/919), and troubleshooting information for various problems, which are presented in charts with 'PROBLEM', 'POSSIBLE CAUSE', and 'CORRECTION' fields instead of specific error codes (e.g., Fast Crowd circuit issues on page 359/919). p. 36
How do you fix case 1085B hydraulic pressure drops or fluctuates mid-cycle while digging, bucket control gets sluggish?
Start with the hydraulic system troubleshooting. Check reservoir level and inspect the main pump for worn seals, since system capacity is 59 gallons on page 12 and low fluid drops pressure fast. Pull the pump and check case drain flow, then pressure test each circuit at the control valve before condemning the pump itself.
How do you fix bucket or arm movement feels erratic and imprecise, especially when running attachments near rated pressure?
Work through the single-circuit checks to isolate whether the fault is in the tool circuit or the control valve itself. Remove the control valve spool and inspect for scoring or contamination, since dirty oil is the usual culprit here. Replace the hydraulic seals in the valve section and refill with fresh fluid to the 59 gallon system capacity noted on page 12 before retesting.
How do you fix engine runs hot and loses power under load during extended operation?
Check the cooling system and radiator hoses first, since these are frequent failure points on high-hour machines. Verify coolant level and inspect for restricted airflow through the radiator core. If overheating persists, pull the cylinder head and check for warpage, torquing the head bolts to 93 lb ft (page 32) on reassembly. Also check engine oil level against the 17 quart with-filter capacity on page 13.
What do I get after purchasing this Case Corporation 1085B, 1086B manual?
This is a 919-page searchable PDF ready for immediate download. Works on any device, so pull it up on your phone while you're under the hood. No shipping, no waiting.
Can I print this Case Corporation 1085B, 1086B manual?
No restrictions at all. Print individual pages, full chapters, or the entire manual. The PDF is completely unlocked.
Does this Case Corporation 1085B, 1086B manual cover the hydraulic system?
Yes, this Case Corporation 1085B, 1086B Service Manual includes hydraulic system diagrams, circuit schematics, and component specifications.
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