Service - Drive Unit - Tar River BPD-680 Operator's Manual

BPD-680/750 Post Hole Driver
Disassembly
Note: Refer to "Auger System Drive Unit" diagram on page 30 for reference numbers.
1. Remove 12, (#17) socket head cap screws and 12 (#16) washers from cover (#14).
2. Lift the cover (#14) off the assembly. Item (#13) thrust washer, usually remains with the cover.
3. Lift (#12) sun gear from (#11) secondary carrier assembly.
4. Remove (#11) secondary carrier assembly from (#10) ring gear.
5. Remove (#10) from (#6) hub.
6. One tab of (#8) lock washer will be engaged in a slot of (#9) bearing nut. Bend the tab back to release (#8)
lock washer. Remove (#9) bearing nut, (#8), and (#7) thrust washer.
Note: A special locknut wrench (PN 613A) is required for the removal of the bearing locknut. Contact
7. Take care to not damage the (#1) shaft splines and threads. Note: the (#3) bearing cone is designed with a
slip fit for (#1) shaft.
8. Remove (#2) seal and (#3) bearing cones from (#6) hub. Inspect (#4) bearing cups in (#6) hub. It is not
necessary to remove these parts unless replacing.
Assembly
Note: Refer to "Auger System Drive Unit" diagram on page 30 for reference numbers.
1. Press new (#4) bearing cups in each side of (#6) hub. It is recommended to replace (#4) bearing cups and
(#3) bearing cones in sets.
2. Assemble (#3) bearing cone into (#4) bearing cup at the seal end of (#6) hub and press a new (#2) seal into
(#6) hub.
3. Lubricate (#2) shaft oil seal and lower (#6) hub onto (#1) output shaft. Be sure to keep (#6) hub centered to
prevent damage to the oil seal. Note: Heavy duty oil seals have no lubricant on (#2) seal, (#1) output shaft
or (#6) hub.
4. Assemble (#3) inner bearing cone over (#1) output shaft. Place (#3) bearing cone over the output shaft
bearing journal. Press (#3) bearing cone down until the rollers are just touching (#4) bearing cup. Caution:
Avoid pressing (#3) bearing cone too far.

Service - Drive Unit

Auburn Gear to purchase this and other service tools.
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