TL;DR
A link tilt actuator fault stops pipe handling operations. Check the hydraulic supply, solenoid valve, and actuator cylinder before dispatching to the rig floor.
What you might see
- link tilt not responding to control input
- tilt actuator fault alarm on driller console
- hydraulic pressure low on tilt circuit
- link arms not extending or retracting to pick up pipe
Likely causes
Hydraulic supply pressure below the minimum for the tilt circuit
Solenoid valve fault preventing fluid to the actuator
Actuator cylinder seal leakage reducing actuation force
Control circuit fault, cable damage, or connection issue at the driller's console
Required tools
- Hydraulic pressure gauge
- Multimeter
- LOTO kit
- PPE: tethered tools, hard hat, safety glasses
Safety first
- The top drive link arms move rapidly under hydraulic actuation. Establish a clear zone around the link arms before testing the tilt circuit.
- All tools used at top drive height must be tethered to prevent dropped objects to the rig floor below.
- Lock out the top drive rotation before any hydraulic circuit inspection near the top drive body.
Procedure
- 1
Check the hydraulic supply pressure for the link tilt circuit at the top drive manifold.[1]
- 2
Test the solenoid valve electrically. Check resistance and energization at the control console output.[1]
- 3
Inspect the actuator cylinder rod for visible seal leakage or physical damage.
- 4
Check the control cable from the driller's console to the top drive junction box for damage or loose connections.
- 5
Attempt a manual function test of the tilt circuit from the top drive local override if available.
Warning: Manual override of link tilt on the rig floor requires a spotter. Link arms under hydraulic actuation can move quickly and cause crushing injuries. - 6
If the solenoid is confirmed faulty, replace with the same part number and test through the full tilt range.
- 7
If the actuator cylinder seal is leaking, plan a cylinder seal replacement at the next top drive laydown opportunity.
Sources
NOV (National Oilwell Varco) NOV TDS-11SA / Ideal Drilling Rig / Top Drive general technical documentation, NOV (National Oilwell Varco)
NOV TDS-11SA / Ideal top drive general link tilt actuator and hydraulic system procedures (general)
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