Minnich A-1C - User Manual

Questions and Answers

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Stephen SmithAug 18, 2025
How to troubleshoot Minnich A-1C that does not run?
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  schneidermelissaAug 18, 2025
  If the Minnich Drill isn't getting enough air, especially when using multiple drill units, try switching the airline with a drill that's working. If the drill then runs, inspect the air control valve. If the valve is functional, check the drill itself. Ensure the valves on both the air compressor and drill unit are fully open. The compressor should provide 100 SCFM per drill and 110 PSI at the drill manifold when using large drills. Also, verify all fittings are properly connected and not leaking.
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Wesley AlexanderAug 20, 2025
Why does my Minnich A-1C run slow?
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  Nicole GonzalezAug 20, 2025
  If the Minnich Drill runs slowly or drills ineffectively, and you're using multiple drill units, try turning off one or two drills. If the remaining drills speed up, the issue might be the air compressor. It should have 100 SCFM per drill and 110 PSI at the drill manifold when drilling with large drills.
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Kenneth DavilaAug 23, 2025
What to do if Minnich Drill electrical circuit failure?
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  Carl BrownAug 23, 2025
  If the Minnich Drill does not run, and you suspect a failure in the electrical circuit, check the switches, connections, coils, ground, and voltage. If jump-starting the power unit (like backhoes or graders), verify the amps and voltage supplied to the coils from the battery, as it might be too low.
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stacyroseAug 26, 2025
How to fix restriction in Minnich A-1C Drill air line?
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  david46Aug 26, 2025
  If the Minnich Drill runs slowly or drills ineffectively, there might be a restriction in the airline, such as a foreign object or a reduction caused by a reducer fitting. Inspect the air line to resolve the issue.
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Christopher GeorgeAug 28, 2025
How to check the drill solenoid valve on Minnich A-1C?
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  Christina GalvanAug 28, 2025
  If the Minnich Drill does not run and you have multi drill units with remote electrical controls, check the drill solenoid valve. You should feel the solenoid move when it's activated. Ensure there's current to the solenoid coil. If there's no movement, replace the solenoid.
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Dawn MitchellAug 30, 2025
How to adjust air pressure for Minnich A-1C?
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  Brianna BrownAug 30, 2025
  If your Minnich Drill runs slowly or drills ineffectively, ensure the air pressure to the cylinder feeding the drill into the concrete is properly adjusted. Excessive pressure can cause the drill to bind, while too little pressure won't feed the drill adequately. Air pressure varies by drill model: Horizontal units with large drills use 22-26 PSI; units with 15lb class drills use 16-20 PSI; vertical units use 5-6 PSI. With correct pressure, the drill steel should have a slight rattle.
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Cassie BrooksSep 2, 2025
What to do if Minnich A-1C coupling or hose obstruction?
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  Joseph ReedSep 2, 2025
  If the Minnich Drill does not run, check for any obstructions in the coupling or hose. If there is an obstruction, remove it.
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Frank SmithSep 4, 2025
Why is Minnich Drill carrier binding?
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  Timothy BrockSep 4, 2025
  If the Minnich Drill runs slowly or drills ineffectively, it could be due to a mechanical binding of the drill carrier. Ensure the eight bearing pads are correctly adjusted. The square tube that the drill carrier slides on must be free of rust for smooth movement. Also, the drill steel must not be binding in the guide bearing.
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Holly DoyleSep 7, 2025
What to do if mechanical failure of Minnich A-1C?
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  Howard BatesSep 7, 2025
  If the Minnich Drill does not run, disassemble the drill and inspect it for damaged parts.
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Wendy KellerSep 9, 2025
Why is Minnich A-1C not hammering properly?
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  Ronnie WilkinsSep 9, 2025
  If the Minnich Drill runs slowly or drills ineffectively, it might be due to using 3 1/4” shank drill steel in a 4 1/4” shank chuck drill. While the drill steel will rotate, it won't allow the drill piston to hammer correctly. Replace it with the correct 4 1/4” drill steel.