Troubleshooting Corner: Sandvik Drill Rig Hydraulic System

Problem: Low feed force on a Sandvik DX800 Surface Drill Rig.

Symptom:

The Sandvik DX800 drill rig exhibits noticeably slow or weak feed force, resulting in reduced penetration rate and increased drilling time. This often correlates with a drop in pressure reading for the feed cylinder circuit.

Possible Cause & Solution:

A common cause is a failed seal (Seal Kit 55041354 or similar for the feed cylinder) or an issue with the hydraulic valve controlling the feed function (e.g., Hydraulic Valve 64586468). If the seals in the feed cylinder are compromised, hydraulic fluid leaks internally, leading to a loss of effective force. Alternatively, if a valve is sticking or malfunctioning (e.g., a faulty Solenoid Valve 55194637 or coil 55044056), the system may not route the required flow or pressure.

Solution: Check the hydraulic pressure at test points. If pressure is low, inspect the feed cylinder for external leaks. If no external leaks are found, the internal seals (like those in Seal Kit 55041354) are likely the culprit and must be replaced. If pressure is erratic, check the control valve. Replace any faulty Seals or Valve Actuators (e.g., Danfoss 157B3171) as necessary. Regular preventative maintenance, including the use of high-quality Sandvik Filter Elements (like 55043779), helps minimize these failures.