Case CX235C SR Excavator Service Manual

Table of Contents

1. Content
2. Introduction
3. Engine
4. Hydraulics System
5. Frames and Ballasting
6. Tracks and Track Suspension
7. Cab Climate Control
8. Electrical System
9. Booms, dippers and buckets
10. Dozer Blade and Arm
11. Platform, cab, bodywork and decals
12. Special Tools Index
13. Hydraulic Schematics
14. Electrical Schematics

Manual Extract: Relief valve – Check

1. Check that the hydraulic circuits and hydraulic oil are clean, then gradually raise the pressure (inch the operating machine in low idle) and check that no oil leaks to the outside.
2. For the oil, use hydraulic oil with an aniline point of 82 – 113 °C (180 – 235 °F).
3. Do not raise the relief valve above the specified set pressure.
4. Set a difference of at least 2.0 MPa (290 psi) between the set pressure for the main relief valve and for the overload relief valve.
5. Warm up the machine adequately before starting the actual work.
Pay attention to the following points in order to avoid sticking due to spool heat shock particularly when starting up with the hydraulic oil temperature or valve temperature low.

• Do not operate the main relief valve and overload relief valve right too suddenly after each other.
Raise the temperature of each section uniformly and operate in such a way that the hydraulic oil circulates within each actuator.
• Fine operations and compound operations generate heat locally due to throttling of individual sections, so do not suddenly perform these operations