Tanaka TBC-420PF Service Manual page 19

7. DRIVE SIDE
7-1 Removing and assembling clutch drum
1) Remove stop ring from clutch drum using long nose snap ring pliers.
Fig.33
2) Then remove clutch drum from fan case or clutch case using
handle bar 8x120 from the stop ring side.
3) Some ball bearing holding clutch drums can be removed from
fan case or clutch case using the snap ring pliers after removing
clutch drum.
NOTE: Check for any wearing of the inner diameter of clutch drum and /or
splines and/or any other parts and replace as necessary.
4) When assembling clutch drum on fan case or clutch case, always
use a new stop ring.
7-2 Removing drive shaft
1) Pull out drive shaft from drive shaft pipe and check any wear and/or
damage and replace as necessary.
2) When installing drive shaft into drive shaft pipe, apply lithium based
grease over drive shaft. To extend the drive shaft life, reverse drive shaft.
7-3 Disassembling gear case Fig.34
1) Remove fixing nut, cutter holder cap and cutter holder. And then remove
stop ring using snap ring priers.
2) Install fixing nut on gear shaft until fixing nut is flush with the
end of gear shaft.
3) Hold fixing nut securely with the vice.
4) Hit gear case using soft hammer until gear shaft and ball
bearing come out from gear case.
5) After removing gear shaft, remove stop ring which secures ball
bearing. Fig.35
6) Remove pinion and ball bearings using one of the pinion removers
shown on the special tool list.
NOTE; When replacing gear and pinion, replace gear and pinion as
one set.
7) To remove pinion from bearings, remove stop ring first, then place
pinion and bearings between a pair of suitable metal stands.
Insert drive shaft which has been cut short into pinion, then tap the short
drive shaft slightly to remove pinion from bearings.
Fig.36
8) If bearing where it is installed in the bottom of gear case needs to
be replaced, heat the bottom of gear case up to 100 degrees to 150
degrees and then tap gear case to wooden base so that bearing
will come off. Fig.36
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