Check the Oil Sight-Glass (when the Tire Combination has been Changed)

IMPORTANT: If a different tire combination is selected, or new rear tires are selected with an SRI (speed/radius index) higher 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 referring 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
	525	625	675	700	725	730	750	775	800	825	875
390	D	—	—	—	—	—	—	—	—	—	—
425	—	B	F	G	G	G	—	—	—	—	—
525	—	D	C	C	B	B	A	F	G	G	—
550	—	E	D	C	C	C	B	A	F	G	—
575	—	—	D	D	C	C	C	B	A	F	G
600	—	—	E	D	D	D	C	C	B	A	G
625	—	—	—	E	D	D	D	C	C	B	F
775	—	—	—	—	—	—	—	—	—	—	D

Indicator letter	Part number
A	AL175219
B	AL176110
C	AL176111
D	AL176112
E	AL176113
F	AL176114
G	AL176115