They arrived in a convoy with Organization for Security and Co-operation in Europe monitors and commenced establishing a base in a farm.
Australia believes that around 80 bodies remain at the site.
Fighting still rages in the region, with 10 Ukrainian soldiers killed in a revolter ambuscade on Thursday.
The fighting had antecedently averted the investigators reaching the area where the Malaysia Airlines jet came down on July 17 with the loss of all 298 passengers and crew.
But after Ukraine’s military declared a unilateral one-day suspension of operations against the revolters in Donetsk region on Thursday, an exploratory visit was made, followed up by the full deployment on Friday.
It is now obscure whether Ukraine’s army or separatist forces control the site, as fighting perpetuates nearby, the BBC’s Tom, Burridge reports from Kharkiv.
On Thursday a revolter delegation held verbalizes with officials from Ukraine, Russia and the OSCE in Minsk, capital of Belarus. The verbalizes are to resume next week, the OSCE verbally expressed in a verbalization.
