Part of the Case Operator Manuals.
This is the complete factory service and operator's manual set for the Case CX31B and CX36B mini excavators. It is organized into the standard sections and covers the machine from the specifications and attachment dimensions, through the maintenance standards and test procedures, the hydraulic system with its main and port relief-valve pressures and the pilot circuit, the electric system, the components including the pumps, control valve, and travel and swing motors, the general disassembly and assembly, the upper slewing structure, the travel system, and the attachment with its boom, arm, bucket, and dozer blade, plus the diesel engine. It carries grounded hydraulic pressure specifications, standard maintenance time tables, troubleshooting, and step-by-step disassembly and assembly, alongside the operator's manual for day-to-day running and maintenance.
What's Inside This Case CX31B, CX36B Repair Manual
| System | Pages | Key Topics |
|---|---|---|
| Specifications | Machine Specifications, Attachment Dimensions, Applicable Machines | |
| Maintenance | Standard Maintenance Time Table, Maintenance Standard and Test Procedure, Tools | |
| Hydraulic System | Hydraulic Circuit, Main Relief Valve Pressures, Port Overload Relief Valves, Pilot Relief Pressure, Pump and Control Valve | |
| Electric System | Electrical Circuit, Sensors and Switches, Controller, Wiring | |
| Components | Hydraulic Pump, Control Valve, Travel Motor, Swing Motor, Cylinders | |
| Disassembly and Assembly | General Disassembly and Assembly, Component Removal and Installation | |
| Upper Slewing Structure | Swing Bearing, Swing Motor and Reduction, Slewing Structure Service | |
| Travel System | Track Frame, Travel Motor, Crawler, Track Adjustment, Crawler Speed | |
| Attachment | Boom, Arm, Bucket, Dozer Blade, Cylinders | |
| Engine | Diesel Engine Service, Idle Speed Settings, Cooling, Removal and Installation | |
| Troubleshooting | Hydraulic and Electrical Troubleshooting, Test Procedures | |
| Operator's Manual | Machine Operation, Controls and Instruments, Daily Maintenance and Lubrication |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Main Relief Valve Pressure | 23.0 MPa (3340 psi) - Boom/Bucket/Travel and Arm/Swing/Travel circuits | |
| Dozer / Slew Relief Pressure | 20.0 MPa (2900 psi) | |
| Pilot Relief Pressure | 3.5 MPa (508 psi) | |
| Engine Idle Speed | Low idle 1200 rpm, High idle 2550 rpm | |
| Hydraulic Oil Temperature | 50-60 °C (122-140 °F) at tank surface |
Case CX31B, CX36B Common Problems This Manual Covers
Boom, arm, or bucket is slow, weak, or drifts under load
Bring the hydraulic oil to operating temperature (50-60 °C at the tank), then gauge the main relief valve against the 23.0 MPa (3340 psi) spec and check the port overload relief valves (25.5-27.5 MPa). Confirm the pump output and control-valve operation before replacing parts, since a relief or pilot pressure fault (pilot spec 3.5 MPa) often causes slow or drifting functions.
Manual Section: Hydraulic SystemTravel is slow, weak, or the machine crabs to one side
Compare the left and right crawler speeds using the specification check (about 18.9 seconds for five revolutions on high), verify the P1 and P2 main relief pressures, and check the track adjustment. A pressure imbalance or a worn travel motor usually causes uneven travel, so confirm the pressures before removing a motor.
Manual Section: Travel SystemSwing is slow, weak, or noisy
Check the slew relief pressure against the 20.0 MPa (2900 psi) spec first, then inspect the swing motor and reduction and the swing bearing. A low relief pressure or a worn swing motor is the common cause, so confirm the pressure before disassembling the slewing structure.
Manual Section: Upper Slewing StructureEngine runs rough, low power, or idle out of spec
Check the idle speeds against the specification (low idle 1200 rpm, high idle 2550 rpm) and the coolant temperature range (60-90 °C at the radiator), then work the engine and fuel service in the Engine section. Confirm the idle and governor settings before deeper engine work, since an idle or fuel fault often presents as low power.
Manual Section: EngineFrequently Asked Questions
The boom or bucket is slow or weak. What pressures should I check?
The manual gives the grounded relief-valve pressures: the main relief valve is 23.0 MPa (3340 psi) for the boom, bucket, and travel circuits, and the port overload reliefs run 25.5 to 27.5 MPa. Hook a gauge into the test port, run the machine to the correct hydraulic oil temperature (50-60 °C at the tank), and compare against spec before condemning the pump or control valve.
Travel is slow or the machine tracks to one side. What does the manual give me?
The Travel System and Components sections cover the travel motor and the crawler, and the specifications include the crawler speed check (about 18.9 seconds for five revolutions on high, 33.2 on low for rubber track). Compare left and right travel speeds and the P1/P2 main relief pressures, and check track adjustment before removing a travel motor, since uneven speed often comes from a pressure or adjustment fault.
Does this set include the operator's manual as well as the service manual?
Yes. This is a combined set: the factory service manual for teardown, testing, and rebuild plus the operator's manual for running the machine, daily controls, and routine maintenance and lubrication. That means you have both the shop procedures with the grounded pressure specs and the day-to-day operating and service intervals in one document.
Are the swing and slewing structure covered?
Yes. The Upper Slewing Structure and Components sections cover the swing motor and reduction and the swing bearing, and the hydraulics section gives the slew relief pressure of 20.0 MPa (2900 psi). That lets you diagnose a weak or noisy swing against the pressure spec before disassembling the swing drive.
What routine maintenance and intervals does the manual cover?
The Maintenance section carries the standard maintenance time table and the maintenance standards and test procedures, and the operator's manual covers the daily checks and lubrication. That gives you the service intervals and the wear limits to keep the machine within factory spec.
Is this Case CX31B, CX36B Repair and Operator's Manual a digital download?
A 1075-page Repair and Operator's Manual in searchable PDF format (98 MB), available the moment you complete checkout. View on computer, tablet, or phone, with no shipping wait.
Am I able to print pages from this Case CX31B, CX36B manual?
Zero restrictions. The PDF is DRM-free. Print whatever sections you need to take out to the shop. Standard letter or A4 paper works.
