Relief Valves - Case 580SR Service Manual

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52 SECTION 35 - HYDRAULIC SYSTEM
3.4

RELIEF VALVES

The relief valves may be operated with anti-cavita-
tion feature (1) or direct acting (2) and protect indi-
vidual circuits from excessive pressure.
The backhoes, having this kind of control valves in-
stalled, are equipped with different relief valves.
Some of them are installed on the loader control
valve:
1. 4x1 loader bucket relief valve
2. Loader bucket relief valve (rod end) - 240 bar
3. Hydraulic speed relief valve - 165 bar
4. Loader bucket relief valve (piston end) - 165 bar
Some of them are installed on the backhoe control
valve:
1. Dipper circuit relief valve (piston end) - 240 bar
2. Loader bucket relief valve (piston end) - 220 bar
3. Swing circuit relief valve (piston end) - 205 bar
4. Boom relief valve (piston end) - 315 bar
5. Swing circuit relief valve (rod end) - 205 bar
6. Boom relief valve (piston end) - 240 bar
7. Telescopic relief valve (rod end) - 205 bar
8. Load sensing relief valve - 210 bar