Kubota J106-STD Operator's Manual page 59

(4) If the above allowance is shorter than 7 mm,
replace the carbon brush holder assembly with
new one. In replacing, be careful not to confuse
the colors of cords (3 and 4).
M4 x 8 mm machine screw tightening torque:
1.0 to 1.4 N-m (0.1 to 0.14 kgf-m)
(5) Reassemble the above parts.
M6 x 15 mm bolt tightening torque:
7.84 to 11.8 N-m (0.8 to 1.2 kgf-m)
(1) Carbon brush holder assembly
(2) Bolt
(3) Black/White
(4) Red/White
(1) Carbon brush holder assembly
(2) Brush
(A) More than 7 mm
PERIODIC SERVICE
4. Checking and cleaning the couplers
(1) There are three sets of couplers in total.
(2) Disconnect all the couplers, and clean up the wire
slots and coupling zones.
(3) Finally, reassemble these parts.
(1) Coupler
5. Checking and cleaning the diode stack terminals
(1) Remove foreign substances off the body and
cords.
(2) Disconnect the cords from the four flat terminals
and clean up the joints.
(3) Finally, reconnect the cords with care not to
confuse the cord colors. The cords have their
respective polarities.
(1) Red/White
(2) Light green
(3) Light green
(4) Blue
43
(A) "CLEAN UP"