Section 4: Maintenance & Lubrication
SA20 Hydraulic Post Hole Diggers 317-215M
3/8/18
25
Motor & Gearbox Disassembly
Refer to Figure 4-1:
The gearbox and motor will need to be removed from the
motor/gearbox housing to lubricate. To do this, the Post
Hole Digger should be hooked-up to the skid steer or
tractor. The bucket on bucket mount units should be
resting on the ground with auger laying horizontally on
the ground. On skid/loader plate units, the Post Hole
Digger hitch should be resting on the ground and auger
laying horizontally on the ground.
Park Post Hole Digger
1.
Shut power machine down using “Power Machine
Shutdown Procedure” on page 7 before dismounting.
2.
Skid Steers Only:
If equipped, raise seat bar and
move controls until both lock.
3.
Use grab-handles, steps, and anti-slip surfaces
when getting on and off the skid steer/tractor.
Disassembly of Motor & Gearbox
1.
Disconnect hydraulic hoses from skid steer/tractor.
2.
Remove auger or auger extension from gearbox
output shaft. Refer to
on page 12 for detailed instructions.
3.
Remove bolts (#5) and hose cover (#1) from gearbox
housing (#2).
4.
Mark hydraulic hose and elbow (#8A) with tape or
other method to keep track of it.
5.
Unscrew 90
o
elbows (#8A & #8B) from straight
adapters (#9A & #9B).
6.
Remove bolts (#3) and lock washers (#7) from
gearbox (#11).
7.
Remove motor/gearbox (#12 & #11) from motor/
gearbox housing (#2).
8.
Check gearbox fluid level and lubricate gearbox
output shaft as needed. Refer to
on page 26 for detailed instructions.
Disassembly & Assembly of Motor
Hydraulic motor (#12) needs to be separated from
gearbox (#11) only when lubricating hydraulic motor
output shaft.
1.
Remove bolts (#4) and lock washers (#6) from
hydraulic motor (#12).
2.
Separate motor (#12) from gearbox (#11). Be careful
not to damage O-ring (#10).
3.
Lubricate output shaft of hydraulic motor (#12). Refer
to
on page 26 for detailed
instructions.
4.
Inspect O-ring (#10). Make sure it is properly seated
in motor (#12) and not damaged. Replace O-ring if
damaged.
5.
Reattach hydraulic motor (#12) to gearbox (#11) with
1/2"-13 x 1 1/2" GR5 bolts (#4) and lock
washers (#6). Tighten bolts (#4) to the correct torque.
Assembly of Motor & Gearbox
1.
Align adapters (#9A & #9B) with motor/gearbox
opening “A” and insert motor/gearbox (#12 & #11) in
motor/gearbox housing (#2).
2.
Secure motor/gearbox (#12 & #11) to motor/gearbox
housing (#2) with 5/8"-11 x 2" GR5 bolts (#3) and lock
washers (#7). Tighten bolts (#3) to the correct torque.
3.
Screw elbow (#8B) to adapter (#9B) until tight.
4.
Screw elbow (#8A) to adapter (#9A) until tight.
5.
Attach hose cover (#1) to motor/gearbox
housing (#2) with 5/16"-18 x 5/8" GR5 hex flange
serrated bolts (#5). Tighten bolts (#5) to the correct
torque.
Hydraulic Motor & Gearbox Assembly & Disassembly
Figure 4-1
37277
