Part of the Case Repair Manuals.
All 148 pages of this Case Backhoe Service Manual (OEM #SM30A) focus on one machine family: the B-1, B-1 Heavy Duty, 43-1, 43-2, 3122, and 3142 International Back Hoes, covering every hydraulic circuit from factory schematics to field repair. You get complete cylinder teardown procedures for lift, dig, bucket, swing, and stabilizer units, plus a full valve section covering the control valve bank, cross line relief valves, flow control and cushion valves, and the proportional flow divider. The Systems section lays out hydraulic schematic diagrams for each model variant, tracing oil flow from pump through every spool and into each working cylinder. Torque your 7/16-20 JIC 37° flared fittings to 1.38-2.76 kgm, and note the standard Type 5 1/4-inch bolt range of 1.24-1.26 kgm. No more chasing hydraulic leaks with hunches and a parts-counter phone call. Bookmarked by section; search any spec by keyword, open it on your tablet, and get back on the machine.
What's Inside This Case B-1, 43-1, 43-2, 3122, 3142 Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 5-26 | Service Tools, Service Parts, Bolt Identification Chart, Standard Torque Data, Seals and Packing, Hydraulic Theory |
| Cylinders | 27-62 | Lift Cylinder, Dig Cylinder, Bucket Cylinder, Swing Cylinders, Stabilizer Cylinders |
| Valves | 63-108 | Control Levers, Control Valve, Cross Line Relief Valves, Flow Control & Cushion Valve, Relief Valve Manifold, Flow Control Valve, Check Valve, Proportional Flow Divider |
| Systems | 109-116 | Description (General), Oil Flow Indicators (High Pressure, Return Flow, Reversing Flow According to Control Valve), Section a B-1 and B-1 Heavy Duty Wain-Roy Back Hoes |
| Reservoirs and Filters | 117-124 | Reservoir, Filters, Suction Strainer, Drain Plug, Filter Cap, Gasket |
| Mainframe | 125-148 | Bucket, Dipperstick, Boom, Lift Arm, Stabilizers, Swing Mechanism |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| JIC 37° FLARED FITTINGS torque (Pipe Size 1/4, Thread Size 7/16 - 20) | 1.38-2.76 kgm (10-20 lbft) | p. 7 |
| Seal replacement interval | whenever a unit is dismantled | p. 9 |
| JIC 37° SEAT Torque (7/16 - 20 thread) | Min 0.83 kgm to Max 1.38 kgm | p. 7 |
| Standard Bolt Torque (Type 5, 1/4" bolt) | Min 1.24 kgm to Max 1.26 kgm | p. 9 |
| Pins and Bushes Clearance | 0.30 mm | p. 20 |
| B-1 | ||
| Lift Cylinder Bore, B-1 | 76.2 mm | p. 18 |
| B-1 Heavy Duty | ||
| Lift Cylinder Piston Bolt Torque | 4.56 kgm to 5.12 kgm | p. 18 |
| B-1, B-1 Heavy Duty | ||
| Relief Valve Manifold Lift Pressure Setting | 70.3 kg/cm2 | p. 19 |
| 43-1, 43-2 | ||
| Control Valve Main Relief Valve Setting | 137.1 kg/cm2 to 144.1 kg/cm2 | p. 22 |
| 3122 | ||
| Lift Cylinder Bore, 3122 | 101.6 mm | p. 23 |
| 3122, 3142 | ||
| Swing Mechanism Backlash | 0.02 mm to 0.33 mm | p. 25 |
