Fault Phenomenon: Caterpillar 950 wheel loader during rapid steering or lifting, the hydraulic system pressure fluctuates severely, actions jerky.

Troubleshooting Process:
– Checked accumulator: bladder ruptured or valve core leaking.
– Checked pre-charge pressure: nitrogen pressure zero.
– Checked mounting: accumulator mounting loose.
– Checked fluid: increased air bubbles in oil.

Root Cause: The hydraulic system accumulator bladder ruptured, causing nitrogen to leak and losing the function of absorbing pressure pulsation and supplementing instantaneous flow.

Required Parts: Replace hydraulic accumulator bladder or assembly, recharge with nitrogen.