Demo/legacy repair — real data lives at cases posted by signed-in technicians.
CAT 336F won't build hydraulic pressure — SPN 3364 intermittent
Caterpillar 336F Excavator · Caterpillar C9.3 ACERT
AI Summary
Based on 14 similar cases, the leading cause is a failing main pump solenoid harness (63%), followed by contaminated pilot pressure sensor (21%). Recommend pilot pressure test and harness continuity check before pump replacement.
Symptoms
Slow boom response, main pump derates under load, occasional stall at idle after warm up.