Ba a daidaita hawan motocin juji ba amma an ƙaddara su ta dalilai kamar nisan miloli, yanayin hanya, da yanayin aiki. Misali, a cikin matsanancin yanayin hakar ma'adinai, ana iya buƙatar kulawa kusan kowane kilomita 5,000. A cikin kyakkyawan yanayin aiki da yanayin titi na yau da kullun, ana iya buƙatar kulawa kowane kilomita 7,000{8}}12,000. Motocin juji da ake amfani da su na dogon lokaci ko aiki akai-akai na iya buƙatar gyara kowane wata, tare da yin hidimar dukkan tafukan huɗu kowane wata shida. Yanayin aiki daban-daban suna ba da buƙatun kulawa daban-daban, kuma ta hanyar daidaita su cikin sassauƙa kawai za'a iya kiyaye aikin abin hawa.
Musamman, farkon kula da manyan motocin juji{0} ana yin su ne bayan kilomita 5,000. Bayan haka, ya kamata a maye gurbin man inji, tace mai, tace iska, da tace dizal a kowane kilomita 5,000. Ana yin cikakkiyar kulawa kowane wata shida, kuma ana daidaita tsarin birki kowane mako biyu. Ana canza man inji da man kaya a duk tsawon kilomita 10,000, sannan kuma ana yin hidimar tafukan kowane kilomita 10,000.
Kulawar tace iska shima yana buƙatar kulawa sosai. Tacewar farko tana buƙatar kulawa kowane awa 600{3}1000 a ƙarƙashin yanayin al'ada, da sa'o'i 200-300 a cikin mahalli mai ƙura. Madaidaicin takarda mai kyau yana buƙatar kulawa kowane sa'o'i 50-100 a ƙarƙashin yanayin aiki na yau da kullun, amma kowane sa'o'i 24 a cikin yanayi mara kyau.
Clutch da birki tafiye-tafiye na kyauta da ba da birki ya kamata a gyara kowane wata ko kowane kilomita 5000. Hakanan ya kamata a mai da fedals da latches. Yawan lalacewa yana buƙatar sauyawa. Yakamata a duba ƙulla maɓalli kowane wata don rashin kwanciyar hankali. A ƙarƙashin matsanancin yanayin aiki, ana iya taƙaita tazarar dubawa zuwa kwanaki 15. Haka nan ya kamata a rika wanke injin a kai a kai da mai da kura da kyalle mai laushi.
sludge na ciki da sauran adibas ana tsaftace su kuma ana kiyaye su a kowane kilomita 5000. Ana tsaftace bututun man fetur da ma'adinan carbon a kowane kilomita 10000. Ana ba da tsarin sanyaya yawanci kowane watanni shida, yayin canje-canje na yanayi, don maye gurbin mai sanyaya da cire sikelin. Ana ba da sabis na watsawa kusan kowane kilomita 20000 don cire sludge mai cutarwa, danko, da sauran adibas. Motocin juji na hakar ma'adinan suna buƙatar ƙarin cikakkun bayanai, an rarraba su ta hanyar mahimmanci da tazara zuwa binciken yau da kullun, kulawa mai zurfi, kulawar da aka tsara, da sauran kulawa. Ana yin gyare-gyare mai zurfi a cikin kilomita 2,500 na farko na sabuwar abin hawa ko bayan babban maye gurbin taro; duban yau da kullun shine binciken aminci kafin amfani da kowace rana; Ana yin gyaran da aka tsara a kowane kilomita 5,000 ko sa'o'i 250 na aiki; da sauran tazarar kulawa sun bambanta.
A taƙaice, tazarar gyare-gyare na manyan motocin juji sun bambanta dangane da abubuwa daban-daban. Dole ne masu mallaka su bi waɗannan buƙatun don kiyaye abubuwan hawan su cikin yanayi mai kyau, tsawaita rayuwar sabis, da tabbatar da amincin tuƙi.