Part of the Case Repair Manuals.
Your 680 has the boom drifting down under load and the loader feels soft, and the fix starts in the Case 680B, 680C, W7E, 680 CK service manual PDF, 834 pages of factory repair data published under OEM number 9-71984 for these loader backhoe models. Hydraulic testing walks you through pump, control valve, and cylinder work before you condemn a part, while wiring coverage maps the Series B and Series C electrical systems circuit by circuit. Exploded views and rebuild procedures take up big blocks of the book, from the A267 diesel bottom end to the Model 36 backhoe. Set boom-down relief pressure to 1250 psi (1100 to 1350 at 10 gpm), pull cylinder head bolts to 145 to 155 ft. lbs. Backhoe hydraulic troubleshooting eats whole afternoons when you are guessing at pressures. Text is searchable and bookmarked by system, and it prints clean, so the pages can live on your bench and take some grease.
What's Inside This Case 680B, 680C, W7E, 680 CK Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 3-22 | Specifications for Case A267 Diesel Engine, Series B Prior to SN 9103967, Lubrication, Maintenance, And Torque Charts, Series B, Maintenance and Lubrication, Series C |
| Engine | 23-234 | Prior to SN 9103967 (Throttle Controls and Linkage, Stall Checks, Air Intake and Exhaust System) |
| Fuel System | 235-328 | Prior to SN 9103967 (Fuel Injectors, Case Powrcel Fuel Injection Pump), SN 9103967 Thru 9111008 (Electric Fuel Pump, Fuel System and Filters, Fuel Injection Pump, Fuel Injectors) |
| Hydraulics | 329-360 | Hydraulic Testing, Equipment Pump, Control Valves, Hydraulic Cylinders |
| Steering | 361-498 | Hydraulic Cylinders, Hydrostatic Steering System, Steering System |
| Power Train | 499-616 | 4-Speed Synchromesh Transmission Series C, Differential and Planetaries, Series C, 4-Speed Mechanical Transmission and Differential Brakes, Supplement to Section S |
| Brakes | 617-652 | Series C, Hydraulic Brake System, Series B |
| Electrical System | 653-740 | Electrical |
| Mounted Equipment | 741-834 | Loader, Loader Supplement, Series C, Model 36 Backhoe |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Camshaft Nut | 95 to 105 Ft. Lbs. | p. 9 |
| Connecting Rod Bolts | 95 to 105 Ft. Lbs. | p. 9 |
| Pump mounting bolts torque | 200 ft. lbs. | p. 332 |
| Special fitting torque | 20 ft. lbs. | p. 353 |
| Boom (Down) Relief Valve Pressure | 1250 psi, range 1100-1350 @10 gpm | p. 408 |
| Boom ("B" Port) Relief Valve Pressure | 2750 psi, range 2600-2900 @10 gpm | p. 408 |
| Stud nut torque | 200 foot pounds (2400 inch pounds) | p. 366 |
| Tilt spool secondary relief valve setting | 2500 P.S.I., range 2400-2600 P.S.I. @ 10 G.P.M. | p. 377 |
| Clam spool secondary relief valve setting | 2500 P.S.I., range 2100-2300 P.S.I. @ 10 G.P.M. | p. 377 |
| A267 Engine Full Load Rated Engine Speed | 2000 RPM | p. 4 |
| A267 Engine No Load Governed Engine Speed | 2150 RPM | p. 4 |
| A267 Engine Idle Speed | 750 RPM | p. 4 |
Case 680B, 680C, W7E, 680 CK Common Problems This Manual Covers
Case 680B hydraulic system sluggish or dead after long storage, boom and bucket barely move
Drain the reservoir and pull the suction screen before you chase the pump. Work through the sluggish system checks starting on page 331, then test rear equipment pump output against the 27.5 gpm at 2200 rpm and 2000 psi figure listed on page 374. Retorque pump tie studs to 200 ft. lbs.
Manual Section: Hydraulic System Troubleshooting p. 331Hydraulic oil contaminated with water or seal debris
Drain every drop, including lines and cylinder barrels, since water and shredded seal material settle low. Clean the screens, flush the circuit, and refill with clean oil. Inspect cylinder packings and glands during reassembly, torquing glands to 100 to 200 ft. lbs. per the values on page 425.
Manual Section: Hydraulic Cylinders p. 425Low pressure at boom or front bucket test ports, loader stalls under load
Hook a gauge to the test port and run the engine at 2200 rpm. Loader main relief should read 2100 to 2200 psi and backhoe main relief 2000 to 2100 psi per the chart on page 408. If both read low, suspect the pump. If only one circuit drops, pull that secondary relief cartridge.
Manual Section: Hydraulic System Troubleshooting p. 408Loader or backhoe cylinder leaking past the gland, rod drifts down while parked
Extend the rod, shut down, and relieve trapped pressure before touching anything. Unscrew the gland, inspect the rod for scoring, and install a fresh seal kit. Torque packing glands to 100 to 200 foot pounds as specified on page 411, then cycle the cylinder to purge air.
Manual Section: Hydraulic Cylinders p. 411Loader bucket rolls back too far or return-to-dig stops working
Adjust the rollback and return-to-dig linkage stops first, then verify tilt secondary relief holds 2500 psi within a 2400 to 2600 psi range at 10 gpm, the setting documented on page 351.
Manual Section: Loader Hydraulic TroubleshootingSlow or hard steering, wheel keeps turning without the front wheels responding
Check oil level and steering pump supply before condemning the hand pump. Run the steering checks beginning to separate a leaking metering unit from a worn cylinder. Retorque the steering pump stud nuts to 200 foot pounds (2400 inch pounds) as listed on page 366 after any reseal work.
Manual Section: Steering System TroubleshootingFrequently Asked Questions
What is the torque specification for the wheel bolts on a Case 680B or 680C?
For the Case 680B and 680C, the wheel bolt torque is 170 ft. lbs. for the front wheels and 250 ft. lbs. for the rear wheels. p. 16
What is the torque specification for the cylinder head bolts on the Case A267 diesel engine?
The cylinder head bolts (Grade 8) for the Case A267 diesel engine must be torqued to 145 to 155 ft. lbs. p. 9
What is the correct valve tappet clearance for the Case A267 diesel engine?
The valve tappet clearance for both intake and exhaust valves on the Case A267 diesel engine is .025 inch, whether the engine is cold or hot. p. 6
What is the recommended oil capacity for the engine crankcase including the oil filter for the Case A267 diesel engine?
The engine crankcase capacity for the Case A267 diesel engine, including the oil filter, is 11 quarts. p. 5
How often should the engine oil be changed on a Case 680B/680C after the initial run-in period?
After the initial 20-hour run-in period, the engine oil should be changed every 150 hours of operation. p. 20
How quickly can I access this Case 680B manual after buying?
This is a 834-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.
Is this Case 680B manual print-friendly?
Print away. There is no DRM and no page limit. Many buyers print one chapter at a time and leave the rest on a tablet.
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