Common faults and troubleshooting methods of down-the-hole drilling rigs

Aug 19, 2022

Fault phenomenon: after the oil pump is started, there is no oil or the amount of oil is insufficient

Reason 1: Insufficient or no oil in the fuel tank


Remedy 1: Refuel to the oil level gauge line


Reason 2: The filter is clogged


Remedy 2: Clean or replace the filter


Reason 3: The fuel tank is airtight


Remedy 3: Check if the fuel tank vent is blocked


Reason 4: The oil suction pipe joint is loose and the air intake


Remedy 4: Tighten the pipe joint


Fault phenomenon: insufficient pressure of hydraulic system


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Reason 1: Relief (pressure regulating) valve spring fatigue


Remedy 1: Adjust its limit nut or replace the spring


Reason 2: The overflow (pressure regulating) valve seat cone valve is damaged or stuck


Troubleshooting method 2: Remove the pressure reducing valve sleeve to check and troubleshoot


Reason 3: Oil leakage from hydraulic components or pipelines


Elimination method 3: Check components and pipeline maintenance


Reason 4: There is air in the system


Remedy 4: Exhaust, and check the cause of the intake and eliminate it


Fault phenomenon: the force of the coupling is not enough to cause it to slip


Reason: Excessive wear or fragmentation of the friction plate, failure or rupture of the compression spring


Remedy: replace the friction plate or replace the spring


Fault phenomenon: excessive wear of the heating elastic ring of the coupling


Reason: poor coaxiality when the power machine and the clutch are assembled


Elimination method: improve assembly coaxiality


Fault phenomenon: hydraulic system oil temperature is too high


Reason 1: Too little oil in the fuel tank


Remedy 1: Refuel to the oil level gauge line


Reason 2: The oil pump is damaged


Remedy 2: Repair or replace the oil pump


Reason 3: The oil pump work selection is unreasonable


Elimination method 3: Reasonable selection of working pump


Reason 4: The oil pump is working under too high pressure


Elimination method 4: Select working pressure according to the recommendation of the manual


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