You get the harvester once you complete all the story quest.

1-clean graveyard from junk
2-clean your farm from junk
3-paint your house (roof and walls) (1 bottle of paint is not enough)
4- clean up through destruction (build 4 bombs)

Total materials to build 4 bombs:

• 1 crafting station (buy it from helen)
  
• 12 landmines
  
• 4 russian grenades
  
• 4 grenades
  
• 4 junk
  (you can buy all grenades from sophia, or pick landmines by the bunker north of marketplace)

Destroy:

• Tank wrecks 0/2
  
• Ruined houses 0/2
  (Place the bomb near these and activate it)

5-Prove that you are fit to be a farmer (grow:)

• onion 0/40
  
• peas 0/30
  
• cabagge 0/20
  
• carrot 0/40
  
• tobacco 0/6
  
• corn 0/40
  
• oat grains 0/30
  
• wheat grains 0/30

6- Win a race vs philip

• You need a horse
  
• He will cheat, give your horse 2 injections (buy these at tekla)

7- new better tractor

• talk to stan
  
• find the wrench on the floor where the landmines are (north of marketplace) (easier to spot in winter)
  
• win a race vs stan (with tractor)
  
• find his keys (inside stan’s workshop, last room on the floor by the window, behind the tractor)

8- fulfill a contract (any contract works)
9-meet your brother by the church's graveyard at 10:00 in the morning.
10- HARVESTER IS MISSING SOME PARTS

• pick 3 boxes north of riverbank by the shore, put them in front of stan
  
• find 4 boxes (1 at marketplace close to houses doors, 2 tekla’s door, 3 sawmill, 4 harbor)
  
• Find a box south of riverbank (by the shore)
  
• find blueprints(it’s also a box) (by the shore of the island in front of the harbor, get there by boat)
  
• wait for a day and pick up the piece at thadeus with your trailer
  
• carry the piece to stan and you will receive the harvester