9
Section 1: Assembly & Set-up
7/31/17
HD25 and HD35 Hydraulic Post Hole Diggers 317-076M
HD 3-Point Mount Assembly
Figure 1-1
70145
12"
35992
Section 1: Assembly & Set-up
transport clearance. Refer to
8.
Raise tractor lower 3-point arms until end of boom is
approximately 18" above ground.
9.
Position gearbox and motor assembly (#7) under
boom assembly (#2).
10. Remove one cotter pin (#11) and hanger pin (#13)
from gearbox (#7).
11. Align gearbox mounting holes with boom mounting
hole and reinsert hanger pin (#13). Secure hanger
pin with cotter pin (#11). Bend one or more legs of
cotter pin to keep it from falling out.
12. Attach lower spring clamp half (#6) and upper plain
clamp half (#5) to boom (#2) 12" up from hanger
pin (#13) with 3/8"-16 x 1 1/4" GR5 bolts (#8) and lock
nuts (#9). Tighten lock nuts to the correct torque.
13. Attach extension spring (#14) to spring clamp (#6)
and tab (#4) on hydraulic motor (#15).
14. Screw 90
o
elbows (#16) into ports in motor (#15).
Point elbows straight back and tighten.
15. Thread adapter fittings (#17) to other end of hydraulic
hoses (#19) and tighten.
16. Quick release couplers (#18) are furnished by
customer. Thread quick release couplers (#18) to
adapter fittings (#17).
17. Screw 66" long hydraulic hoses (#19) into motor
fittings (#16) and tighten.
18. Fill gearbox with gear lube. Refer to
on page 33 for detailed instructions.
IMPORTANT:
The gearbox is shipped without gear
lube and must be filled before operating the digger.
Skid Steer/Tractor Requirements
The auger is designed to attach to skid steers, track
loaders, or tractor front-end loaders equipped with a skid
steer type quick attach hitch that meets SAE. It also can
be attached to the back of tractors with a Cat. I or Cat. II
3-point hitch, or to the side of a tractor front-end loader
bucket. The following requirements must be met:
Hydraulic Pressure Rating . . . . . . . 1,500 - 3,500 PSI
Hydraulic Flow Rate
Model HD25 . . . . . . . . . . . . . . . . . . . . . . 5-12 GPM
Model HD35 . . . . . . . . . . . . . . . . . . . . . 10-25 GPM
Max Torque @ 2,500 PSI
Model HD25 . . . . . . . . . . . . . . . . . . . . . . 700 ft-lbs.
Model HD35 . . . . . . . . . . . . . . . . . . . . . 1,605 ft-lbs.
Hydraulic Connections . . . . . . . . . . . 1 - Duplex Outlet
HD 3-Point Mount Assembly
Refer to Figure 1-1:
1.
Remove tractor top center 3-point link (not shown).
Keep hitch pin and retaining pin for future use.
2.
Attach boom (#2) to the tractor’s top center link hole
using existing hitch pin and retaining pin.
3.
Attach yoke (#1) to the tractor’s lower 3-point lift arms
with two 5/16" x 1 3/4" linchpins supplied by
customer).
4.
Connect lower 3-point sway bars or adjust sway links
to retain digger side to side movement.
5.
Rotate boom (#2) and yoke (#1) up until pin (#12) can
be inserted into the boom’s middle hole.
6.
Place spacers (#3) between digger yoke (#1) and
boom (#2) as shown and insert pivot pin (#12).
Secure pin with cotter pin (#10). Bend one or more
legs of cotter pin to retain pin.
7.
Boom and yoke pivot connection may need
readjusting to get the desired hole depth and auger
NOTE:
The Post Hole Digger will be easier to
assemble if assembled to a tractor.
