John Deere 70 Series
Combine Calibration
Yield Calibration
IMPORTANT:
Mass flow sensor must be calibrated every year to achieve accurate grain weight measurements.
Standard calibration must be performed in every crop that is harvested.
Low Flow calibration must be performed to obtain improved levels of accuracy in situations where large variations in
grain flow rates occur.
1. From diagnostics and calibration icon (A),
rotate selection dial (B) until calibrations
menu (C) is highlighted
2. Press Confirm switch (D) and rotate
selection dial until Yield is highlighted.
3. Press confirm switch and rotate selection
dial until enter icon (E) is highlighted.
4. Press Confirm switch and advance to next
page.
NOTE: Operator must perform the standard
calibration before the low flow calibration
5. Rotate the selection dial (A) until one of the
following icons is highlighted:
 Next Page Icon (B) – allows to
advance to next page of calibration.
 Weight Icon (C) – allows to enter
scale weight in calibration factor
once scale weight is known from
elevator.
 Comp Number Reset Box (D) –
allows to reset the low flow
calibration.
 Calibration Factor (E) – allows to
input a calibration factor number that was figured using a formula.
6. Press Confirm switch (F) once desired selection is highlighted.
7. Rotate selection dial until one of the
following icons is highlighted:
 Next Page Icon (B) – allows to
advance to next page of calibration.
 Standard Calibration Mode Box (C)
– allows to perform a calibration to
obtain an improved level of
accuracy in situations where there
are large variation in grain flow
rate.
 Low Flow Calibration Mode Box
(D) – allows to perform a
calibration to obtain an improved level of accuracy in situations where there are
large variations in grin flow rate.
8. Press confirm switch (E) once desired
9. Standard Calibration Mode
 Rotate selection dial until next page
icon is highlighted and press
confirm switch
OR
Low Flow Calibration Mode
 Instantaneous Flow Rate (E) – arrow
below bar graph indicated
instantaneous flow rate.
 Standard Calibration Point (F) –
green dot indicated standard
calibration point (will be red if a
scale weight for standard
calibration has not yet been
entered).
 Average Flow Rate (G) – red circle
indicated average flow rate during
low flow calibration.
NOTE: When calibrated correctly, red
circle should end up toward left side of
bar graph within range area (H)
If scale weight is not known, rotate selection
dial until enter icon (B) is highlighted and
press checkmark. Operator can continue
harvesting until scale weight is known.
10. Scale Weight is Known or Returns from
Elevator
 Rotate selection dial until weight
icon (A) is highlighted and press
confirm switch.
 Rotate selection dial until scale
weight box (B) is highlighted and
press confirm switch.
 Using numeric display, rotate
selection dial until desired digits
are highlighted and press confirm
switch.
 Rotate selection dial until enter
icon (C) is highlighted and press
confirm switch to return to
calibration menu
 Rotate selection dial until next
page icon (D) is highlighted and
press confirm switch to follow
instructions shown on remaining
screens.