Check the Oil Sight-Glass (when the Tire Combination has been Changed on Tractors 7130 and 7230)

IMPORTANT: If a new pair of tires is selected, the Basic Control Unit (BCU) must be recalibrated; if the tractor has IVT, the User Interface Controller (UIC) must be recalibrated as well. See your John Deere dealer.

If the new rear tires have a higher SRI (speed/radius index) than the previous ones, the tractor's electronics must be recalibrated by your John Deere dealer.

Refer to “Specifications” section for the SRI (speed/radius index) of the tires supplied with the tractor when it left the factory. Ascertain the indicator letter (A-G) of the existing oil sight-glass by refering to Table 1.

Ascertain the indicator letter of the required sight-glass by finding the SRI of the desired tire combination in Table 1. If a new glass is required, refer to Table 2 for the part number.

SRI of front tires	SRI (speed/radius index) of rear tires
	775	800	825	875
625	C	C	B	F
650	D	C	C	A
675	D	D	C	B
High Crop tractors:
825	—	—	G	—
875	—	—	F	G

Non-IVT		IVT
Identification Letter	Part Number	Identification Letter	Part Number
A	AL175219	A	AL176116
B	AL176110	B	AL176117
C	AL176111	C	AL176118
D	AL176112	D	AL176119
F	AL176114	F	AL176121
G	AL176115	G	AL176122