Check hydraulic oil on sight level gauge on hydraulic tank, pumps would be making noise if oil level is low. Make sure all hoses are connected properly and not damaged. Check couplings and make sure they are plugged in properly.
[pdf] Motor Power: 22KW to 250KW | 30HP to 335 HP Working Pressure:3 – 5 Bar | 0.3Mpa to 0.5Mpa Free Air Delivery (FAD): 2.74 to 64.54m³/min | 95 to 2280 CFM Delivers efficient, space-saving performance with integrated storage for continuous, reliable air supply.
[pdf] But here is the silver lining: cheap, affordable geotechnical drilling rigs are plentiful and price with performance. In this buyer's guide, you will learn important considerations in choosing the best geotechnical rigs for small contractors and cost-effective soil testing strategies.
[pdf] 
