Figure 17. Bearing impact distribution.
3
2
1
4
Figure 16. Guiding cutterhead into carriage.
Figure 14. Hex bolt in helical gear threads.
Hex Bolt
Inner Race
Outer Race
Rubber
Seal
Figure 15. Bearing outer race.
-5-
D4934 13" Helical Cutterhead Instructions
33. Install
5
⁄
16
"-18 x 2" hex bolt into helical
pinion gear threads (see
Figure 14).
34. Remove wood board and gently tap hex
bolt dead center with hammer until
cutterhead is unseated from carriage.
35. Pull cutterhead through right bearing bore.
36. Use a 31mm deep well socket or wood
block to remove left bearing from bore.
Note: Focus impact to bearing on outer
race (see
Figure 15
).
1. Remove helical cutterhead from packaging.
2. Lightly oil left and right bearing bore
surfaces and remove any dust or dirt.
3. Lower cutterhead into carriage while
guiding threaded end through right bearing
bore (see
Figure 16).
4. Install
5
⁄
16
"-18 x 2" hex bolt into helical
pinion gear threads.
5. Seat 6202-2NSE ball bearing into left bearing
bore using hex bolt as an alignment guide.
6. Use 31mm deep well socket or wood
block to gently tap bearing into bore until
retaining ring groove is visible and bearing
is flush with internal carriage wall.
Note: If using wood block to install
bearings, ensure that impact is evenly
distributed around outer race to prevent
bearing tilt (see
Figure 17
).
7. Re-install retaining ring into bearing bore
groove.
Installing Helical Cutterhead
We strongly recommend using the new
replacement bearings included with the Model
D4934, even if the existing bearings appear to
be in good condition.
Tip: Wrap the new bearings and place them in
a freezer overnight. This will cause the bearing
metal to contract, making them easier to install.
