Case 580SR Service Manual page 646

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56
Overhaul
IMPORTANT: before removing relief valves from
the machine lower the loader and backhoe to the
ground, switch engine off and relieve all pressure in
circuits by moving the backhoe, loader, and tele-
scopic dipper controls through all operating posi-
tions. If the pressure relief valves are suspected of
contamination, they may be disassembled and in-
spected for wear. However, remember to restore the
correct pressure.
The relief valves contain no serviceable components
with the exception of the external O-rings and
square section seals.
During disassembly examine the poppet and seat in
the plunger assembly for a complete seating surface.
Pilot operated relief valve
1. Body
2. Shutter
3. Spring
4. Spring
5. O-ring
6. O-ring
7. Valve
8. Cover
SECTION 35 - HYDRAULIC SYSTEM
9. O-ring
10. Nut
11. O-ring
12. Adjuster screw
13. Spring
14. Pilot valve
15. Poppet
16. Piston
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