MI-290AG
Rev. 4
8
Replacement of nozzle hub bushings (14)) (see parts list PL 290AG: p10)
Unscrew (clockwise-left hand thread) rotary housing plug (21), and slide bushings (14),
and nozzle hub (19) off the rotary housing (13). Remove any foreign material from nozzle hub
gear teeth. To replace parts, slide one bushing (14) onto rotary housing tube (13), push up to
the shoulder. Next slide nozzle hub (19) followed by second bushing (14) onto rotary housing
tube (13). Finally screw on (counterclockwise) rotary housing plug (21) and tighten with wrench
until tight.
Replacement of rotary housing bushing (14), split bushing (12), shaft bushing (16) and o-
ring (3) (see parts list PL 290AG: p10)
Note position of drive link (17) tabs relative to rotary housing (13). Remove drive link
retaining screw (18), and drive link (17) from unit. Next remove the lower bushing retainer (15).
Now slide the rotary housing (13) assembly with its bushing (14) and split bushing (12) off the
bevel gear sub-assembly (11). Remove any foreign material from the bevel gear teeth.
Remove worn bushing (14) and split bushing (12) from the rotary housing (13). Remove
worn shaft bushing (16) and o-ring (3) from the lower bushing retainer (15) and replace with new
parts. Inspect shaft (9) for wear and replace shaft if worn.
Now you are ready to reassemble the unit by first installing the split bushing (12) nearest
the gear (11). Holding split bushing (12) in place on bevel gear sub-assembly (11), slide rotary
housing (13) over split bushing. Install bushing (14) over bevel gear sub-assembly (11) into
rotary housing (13).
Now carefully screw the lower bushing retainer (15) over the shaft (9) and into bevel
gear sub-assembly (11). Tighten retainer (15). Reinstall the drive link (17) with tabs in the
same position noted earlier and tighten retainer screw (18).
