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Section 4: Options
7/31/17
HD25 and HD35 Hydraulic Post Hole Diggers 317-076M
Down Pressure Cylinder Plumbing
Figure 4-12
Refer to Figure 4-12:
14. Install hydraulic plumbing using teflon tape to seal
pipe threads. Do not tighten connections until after all
fittings have been installed.
a. Connect plug (#3) to rod end of hydraulic
cylinder (#1).
b. Connect straight fitting (#8) to clevis end of
hydraulic cylinder (#1).
c. Connect shuttle tee fitting (#9) to straight
fitting (#8).
d. Connect pressure relief valve (#2) to shuttle
tee (#9).
e. Connect standard tee fitting (#5) to the bottom end
of pressure relief valve (#2).
f. Connect 90
o
elbow fitting (#4) to remaining port of
pressure relief valve (#2).
g. Connect 3/8" x 15 3/4" bypass line (#7) to shuttle
tee (#9) and standard tee (#5).
h. Connect 3/8" x 84 1/2" pressure line (#6) to
90
o
elbow fitting (#4).
i. Customer to provide return line. Connect return
line to tee fitting (#5).
j. Connect pressure line (#6) to tractor hydraulic
outlet. Connect return line to reservoir or sump.
26829
Return Line
to Sump
Pressure Line
Shuttle Tee
Nut Placement
IMPORTANT:
Do not connect return line to tractor
remote outlet. Damage will occur to digger frame if
not properly hooked up to reservoir or sump.
Setting Down Pressure Kit
Figure 4-13
Adjust Down Pressure Kit
Refer to Figure 4-13:
1.
Raise Post Hole Digger so that auger tip is 6" to 12"
above ground.
2.
Set tractor 3-point up-stop to limit auger maximum
raised height to 12". Exceeding this height can cause
undue stress on PTO driveline and cause driveline
damage.
Refer to Figure 4-14:
3.
Loosen bolts in clamp plates (#4).
4.
Push top of cylinder mounting plates (#1 & # 2)
forward toward the tractor until plates have firmly
contacted digger yoke.
5.
Make sure cylinder clamp plates (#4) will move fairly
free on digger boom and that cylinder (#3) is fully
retracted.
6.
Extend cylinder (#3) 1/2" and tighten bolts in clamp
plates (#4) evenly to 76 ft-lbs.
Set Down Pressure Kit
Figure 4-14
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