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Part of the Case Repair Manuals.
This Case Corporation 688 Excavator Service Manual (OEM #8-66052) runs 769 pages deep on the Crawler Excavator platform, and it's built to answer questions your service history can't. You get full electrical schematics for the 24 Volt alternator and starter circuit, complete hydraulic schematics covering the high and low pressure pumps, and a dedicated troubleshooting section for the drive control and swing valve systems. Open to the engine chapter and you'll find real numbers: main bearing bolts torque to 129 lb ft (175 Nm), and the return filter needs replacing every 500 hours. No more pulling a torque wrench and guessing what Case actually specified back at the factory. Every chapter, from track rollers to the final drive transmission, is bookmarked so you can jump straight to the system giving you trouble. Pull it up on a tablet in the shop, search any spec by keyword, and get your 688 back on the job.
What's Inside This Case Corporation 688 Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 4-43 | Safety Rules, General Information and Torque Specifications, Detailed Engine Specifications, Maintenance and Lubrication |
| Engine | 44-277 | Engine Removal and Installation and Radiator Removal and Installation, Engine Accessories, Cylinder Head and Valve Train, Cylinder Block, Pistons, Rods, Camshaft, Main Bearings |
| Fuel System | 278-347 | Fuel Lines, Fuel Tank, And Engine Controls, Fuel System and Filters, Fuel Injection Pump and Drive Gear, Fuel Injectors |
| Electrical | 348-409 | Removal and Installation of Electrical Components, Electrical Specifications and Troubleshooting, Electrical Schematic, Batteries, Starter and Starter Solenoid, Volt Alternator |
| Track | 410-443 | Removal and Installation of Track Components, Troubleshooting, Track Chain and Shoes, Track Rollers, Idler, And Sprocket |
| Power Train | 444-513 | Removal and Installation of Power Train Components, Maintenance, Drive and Swing Motor, Final Drive Transmission, Swing Transmission |
| Hydraulics | 514-751 | Removal and Installation of Hydraulic Components, Maintenance and Service, Specifications and Troubleshooting, High Pressure Pump, Low Pressure Hydraulic Pump |
| Mounted Equipment | 752-765 | Boom, Arm, And Tool, Turntable Bearing and Related Parts |
| Schematics in Rear Pocket | 766-769 | Electrical Schematics, Location Schematics, Hydraulic Schematics |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Main Bearing Bolts Torque | 129 lb ft (175 Nm) (17.5 kgm) | p. 23 |
| Return Filter replacement interval | after every 500 hours of operation | p. 545 |
| No. 1 Compression 4T-390 Engine End Gap in 102.02 ID | 0.4 to 0.70 mm | p. 18 |
| Injection Pump Nut torque | 48 lb ft (65 Nm) (6.5 kgm) | p. 292 |
| Starter Torque for studs | 40 to 53 pound-inches (4.5 to 6.0 N m, 0.46 to 0.61 kg/m) | p. 381 |
| Engine Oil Pressure with Engine Warm at Rated Engine Speed | 42 to 54 PSI (290 to 372 kPa) (2.90 to 3.72 bar) | p. 13 |
| Main safety valve (in attachment control valve) pressure | 6185 to 6470 psi (42 646 to 44 511 kPa, 435 to 455 bar) | p. 551 |
| Engine Oil Capacity (with filter) | 11 Quarts | p. 13 |
| Fuel Tank Capacity | 58 U.S. gallons | p. 29 |
| Rated Engine Speed | 2040 to 2070 RPM | p. 13 |
| Valve Tappet Clearance (Exhaust) (Cold) | 0.508 mm | p. 13 |
| Cylinder Head Warpage (Maximum) | 0.20 mm | p. 18 |
