Ke piʻi kiʻekiʻe loa ka mahana o ka pauma elevator no nā kumu ʻehā:
ʻO kaʻokoʻa kūpono ma waena o nā'āpana hoʻoneʻe i loko o ka paila heʻuʻuku loa ia, no laila, aia nā'āpana hoʻoneʻe i kahi maloʻo maloʻo a me semi-dry friction, a ua nui ka wela;ua pau ka bearing;hoʻopau ʻia ka pā aila a i ʻole rotor;ma waena o ka rotor a me ka pā ʻaila ʻaila ʻO ka ʻae ʻana o ke axial he nui loa, he koʻikoʻi ka leakage a hana ʻia ka wela.
ʻO ka paila hydraulic kekahi o nā mea koʻikoʻi o ka ʻōnaehana hydraulic o ka hoʻokiʻekiʻe paʻa, e hāʻawi ana i ka mana ikaika.Ma keʻano he mea nui o ka elevator, he mea nui loa ka paila hydraulic no kāna hana maʻamau.Ke pau ka pauma hydraulic, e hoʻopili ia i ka hoʻohana maʻamau o ka hāpai ʻana.
I nā pilikia maʻamau, ʻaʻole lawa ka kahe puka ʻana a i ʻole ka puka kahe o ka pā hydraulic.Nui nā kumu no ka lawa ʻole o ka hoʻoheheʻe ʻana o ka paila hydraulic, akā pono kēia e hoʻoponopono ʻia i kēlā me kēia mea.ʻO ke kumu o ka overheating o ka hydraulic pump o ka hoʻokiʻekiʻe paʻa, ʻo ia ka haʻahaʻa o ka mechanical efficiency a i ʻole ka haʻahaʻa o ka volumetric efficiency.Ma muli o ka haʻahaʻa haʻahaʻa haʻahaʻa a me ka nui o ka mechanical friction, ke kumu o ka nalowale o ka ikehu mechanical.Ma muli o ka haʻahaʻa haʻahaʻa volumetric, ua nalowale ka nui o ka ikehu hydraulic, a lilo ka ikehu mechanical nalowale a me ka ikehu hydraulic e lilo i ikehu wela.