STRUCTURE AND FUNCTION CLSS 3. OPERATION FOR EACH FUNCTION AND VALVE Features The small capacity gear pump keeps high speed movement because lift arm and the bucket circuit are connected in a series circuit. The control valve has built in self leveling function. If loading pressure of bucket becomes beyond a certain value, the lift arm and the bucket circuits automatically change to parallel circuit to keep strong digging force. The lift arm, attachment and High-flow section are connected in a parallel circuit and it has pressure compensa- tioning function each section. During individual operations, attachment High-flow keep individual demand flow rate.
However during compound operations, they are divided in the proportion of 1 to 9 and keep High-flow section flow rate. (SK815-5 has only Super-flow specification.) Hydraulic circuit diagram and names of valves P2 Optional equipment Optional equipment Bucket cylinder Raise arm Pa1 Raise cylinder 7 Pa1 Lower arm RKS00751 1. Unload valve 2. Main relief valve 3. Pressure compensation valve (lift arm) 4. Pressure compensation valve (bucket) 5. Pressure compensation valve (attachment) 6. Pressure compensation valve (High - Flow) 7. Float valve 8. Leveling circulating valve 9. Combination circulating valve 10. Flow divider 11. Shuttle valve 12. Check valve (circulating circuit) 13.
High - Flow joining spool 10-40 SK818-5 SK820-5 turbo 13 P1 6 Pa3 11 5 4 11 9 8 12 10 3 1