Part of the Case Repair Manuals.
Strip, test and rebuild the Case CX57C cab mini excavator with Case's own factory service manual. It covers the Tier IV final Yanmar 4TNV98C with common-rail injection, EGR and DPF. The hydraulics get the same depth: tandem pump, main control valve, pilot controls, swing and travel motors, and every cylinder on the machine.
A job usually stalls for want of one number, such as main relief pressure, track slack or a head bolt torque. This book gives you Case's figures instead of a forum guess. It also has the pressure tests, troubleshooting charts, connector pin tables and engine diagnostic procedures.
The sections follow Case's own system layout, so hydraulics, electrical, fault diagnosis and undercarriage each have their own block. The foldout electrical and hydraulic schematics are at the back. Go straight to the system that's down and get the crew working again.
What's Inside This Case CX57C Manual
| System | Pages | Key Topics |
|---|---|---|
| Introduction | 1-50 | Safety Rules, Standard and Special Torque, Machine Specifications, Weights, Dimensions, Working Range, Fluids and Lubricants, Product Identification |
| Engine and Crankcase [10.001] | 51-131 | Engine Specifications, Special Tools, Service Limits, Compression Test, Engine Troubleshooting, Overhaul |
| Valve Drive, Cylinder Head, Pistons, Crankshaft, Fuel Tank | 132-205 | Valve Clearance Check, Cylinder Head Removal and Bolt Tightening, Pistons and Connecting Rods, Crankshaft and Flywheel, Fuel/Water Separator |
| Fuel Injection, Air Intake, Exhaust and EGR | 206-269 | Common-Rail Supply Pump and Injectors, Air Cleaner, Manifolds, DPF Regeneration, EGR Valve Cleaning and Replacement |
| Engine Cooling and Lubrication | 270-327 | Radiator and Coolant Drain, Fan and Belt, Engine Oil System and Filter |
| Hydraulic Systems [35.000] and Reservoir | 328-405 | Dynamic Description, Hydraulic Schema, Hydraulic Troubleshooting, Releasing Pressure, Reservoir, Oil Cooler and Filters |
| Main Pump and Main Control Valve | 406-505 | Variable Displacement Pump, Delivery, Relief and Pilot Primary Pressure Tests, Pump Troubleshooting, Control Valve Spools and Relief Valves |
| Pilot System, Hand and Foot Controls | 506-571 | Pilot Solenoid Block, Joystick and Travel Pedal Pilot Valves |
| Swing, Travel and Central Joint | 572-695 | Swing Motor and Brake, Swing Speed and Drift Tests, Travel Motor Tests, Travel Troubleshooting, Turning Joint |
| Boom, Dipper, Bucket and Auxiliary Circuits | 696-804 | Cylinder Troubleshooting and Overhaul, Hammer and Rotating Bucket Circuits, Quick Coupler, Boom Swing and Dozer Cylinders |
| Frames and Tracks | 805-874 | Counterweight, Track Tension Adjustment, Track Frame, Idler and Tension Unit, Rollers |
| Cab Heating and Air Conditioning [50] | 875-928 | Heater and Air Conditioning Description, Operation and Component Replacement |
| Electrical System [55.000] | 929-1073 | Electrical Schema Tables and Drawing, Connector Identification Sheets, CAN Lines, Engine Diagnostic Tool |
| Harness Localization and Electrical Schematic Sheets | 1074-1153 | Harness, Fuse Box and Connector Locations, Legend, Battery and Starting, Power Distribution, Engine Controller, Lamps, Wiper, Air Conditioning Sheets |
| Wire Connectors and Fuse and Relay Box | 1154-1357 | Connector Pin Tables per Component Diagram, Fuse and Relay Box, Anti-Restart Relay |
| Electrical Subsystems and Instruments | 1358-1519 | Engine Control, Starting, Alternator, Battery, Engine Sensors, Electronic Modules, Cab Controls, Wiper, Lighting, Instrument Cluster and Warnings |
| Fault Codes [55.DTC], Engine Sensors and Fuel System | 1520-1607 | Intake Throttle Sensor, Rail Pressure, Fuel Temperature, EGR Gas Temperature, Eeprom, Supply Pump Codes |
| Fault Codes [55.DTC], Injectors, EGR and DPF | 1608-1697 | Injector Circuit Faults, Alternator, Accelerator Dial, Cluster Communication, EGR Valve, Intake Throttle Actuator, DPF Sensor Codes |
| Fault Codes [55.DTC], Speed Sensors and CAN | 1698-1761 | Starting Air Relay, Crankshaft and Camshaft Speed Sensors, Engine ECU Internal Faults, CAN Time-Outs, Code Index |
| Booms, Dippers, Buckets and Dozer Blade | 1762-1798 | Boom, Dipper and Bucket Removal and Installation, Dozer Blade |
| Platform, Cab and Bodywork [90] | 1799-1879 | Cab Removal, Operator Controls and Monitor, Seat, Engine Hood |
| Foldout Electrical and Hydraulic Schematics | 1880-1883 | Full-Machine Electrical Schematic and Hydraulic Schematic with Legends |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Engine model | Yanmar 4TNV98C, 4-cycle diesel, 4 cylinders in-line | p. 20 |
| Rated gross power (SAE J1995) | 49.9 kW (67.8 Hp) at 2400 RPM | p. 20 |
| Piston displacement | 3319 cm³ (203 in³) | p. 20 |
| Maximum torque at 1550 RPM | 235.4 N·m (173.7 lb ft) | p. 20 |
| Engine oil quantity | 11.6 L (3.1 US gal) | p. 20 |
| Hydraulic system total capacity | 120 L (31.7 US gal) | p. 40 |
| Main relief valve pressure | 21581 kPa (3130 psi) | p. 20 |
| Overload relief valve pressure | 23511 kPa (3410 psi) | p. 20 |
| Main pump rated oil flow | 2 x 57.8 L/min (15.3 US gpm) | p. 20 |
| Pilot primary pressure, standard value | 2.45 - 3.43 MPa (355.37 - 497.52 psi) | p. 453 |
| Travel speed, low / high | 2.2 km/h (1.4 mph) / 4.2 km/h (2.6 mph) | p. 1829 |
| Track slack, steel track | 130 - 150 mm (5.1 - 5.9 in) | p. 836 |
| Valve clearance, intake and exhaust | 0.15 - 0.25 mm (0.006 - 0.010 in) | p. 66 |
| Cylinder head bolt torque, M11 x 1.25 | 103.1 - 112.9 N·m (76 - 83 lb ft) | p. 65 |
| Sprocket mounting bolt torque, M14 x 2.0 | 172.9 - 212.2 N·m (127.5 - 156.5 lb ft) | p. 17 |
| Operating weight, cab version | 5650 kg (12456 lb) | p. 22 |
Case CX57C Common Problems This Manual Covers
Hydraulic oil runs abnormally hot
Start with the tank oil level. Then check the hydraulic oil cooler and the air circulation ducts for clogging. Measure fan belt deflection at 98 N (22 lb) between the fan drive pulley and the alternator pulley. Measure main relief pressure, check how often the main relief valve is opening, and reduce the load.
Manual Section: Hydraulic systems - Abnormally high hydraulic oil temperature p. 382Travel is weak or powerless
Measure travel relief valve pressure first, because a low reading points to a faulty relief valve. Next, measure travel brake pressure and the travel motor drain rate. Then check by hand whether the parking brake piston moves. A clogged release circuit or a stuck piston will hold the travel motor back.
Manual Section: Hydraulic travel system - Travel action powerless p. 680Boom, arm or bucket cylinder drifts and the attachment falls
Check hydraulic oil quality, and confirm the oil temperature is at or below 80 °C (176.0 °F). Swap the port relief valve with a known good one and inspect the control valve return spring. Measure internal leakage of the cylinder. If it still drifts, disassemble the check valve in that hydraulic circuit.
Manual Section: Boom hydraulic system - Cylinder extends or contracts itself and attachment falls p. 705Engine will not start, with no signal from either the crankshaft or camshaft speed sensor
Possible causes are harness or connector damage, both sensors failing, shorted or open signal lines, a starter system fault, or a defective engine ECU. First confirm the fault is active, then go over the harness. Measure the crankshaft speed sensor resistance against 1050 Ω ± 10%, then check the camshaft speed sensor.
Manual Section: Fault codes - Engine does not start p. 1755Frequently Asked Questions
What engine does the Case CX57C have and how much power does it make?
It runs a Yanmar 4TNV98C, a four-cylinder in-line diesel. The manual rates it at 49.9 kW (67.8 Hp) gross at 2400 RPM to SAE J1995. Maximum torque is 235.4 N·m (173.7 lb ft) at 1550 RPM. p. 20
How much engine oil does the CX57C take and what grade?
The engine takes 11.6 L (3.1 US gal). Case specifies CASE AKCELA UNITEK 10W-40. p. 40
How much hydraulic oil does the CX57C hold and what grade?
The tank holds 70 L (18.5 US gal) and the whole hydraulic system holds 120 L (31.7 US gal). The specified oil is CASE AKCELA HYDRAULIC LL 46 (ISO 11158 L-HV46). p. 40
How tight should the tracks be on the CX57C?
On steel track the slack should be 130 to 150 mm (5.1 to 5.9 in). Rubber track runs much tighter at 39 to 44 mm (1.5 to 1.7 in). p. 836
How much does the CX57C weigh?
Operating weight is 5650 kg (12456 lb) for the cab version with steel track and the standard boom, arm and bucket. Case quotes a tolerance of +/- 3%. p. 22
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